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WO2017018520A1 - Matériau composite de titane et matériau de titane pour laminage à chaud - Google Patents

Matériau composite de titane et matériau de titane pour laminage à chaud Download PDF

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Publication number
WO2017018520A1
WO2017018520A1 PCT/JP2016/072342 JP2016072342W WO2017018520A1 WO 2017018520 A1 WO2017018520 A1 WO 2017018520A1 JP 2016072342 W JP2016072342 W JP 2016072342W WO 2017018520 A1 WO2017018520 A1 WO 2017018520A1
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Prior art keywords
titanium
layer
slab
surface layer
alloy
Prior art date
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PCT/JP2016/072342
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English (en)
Japanese (ja)
Inventor
知徳 國枝
森　健一
一浩 ▲高▼橋
藤井　秀樹
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Priority to JP2016563008A priority Critical patent/JP6128289B1/ja
Publication of WO2017018520A1 publication Critical patent/WO2017018520A1/fr
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon

Definitions

  • the present invention relates to a titanium composite material and a titanium material for hot rolling.
  • Titanium material has excellent properties such as corrosion resistance, oxidation resistance, fatigue resistance, hydrogen embrittlement resistance, and neutron blocking properties. These properties can be achieved by adding various alloying elements to titanium.
  • Industrially pure titanium is mainly composed of an ⁇ phase having an hcp (dense hexagonal lattice) structure, and it is known that when a large amount of hydrogen is absorbed in the ⁇ phase, a hydride is formed and embrittles. For this reason, depending on the use environment, there is a case where an accident occurs in which hydrogen is absorbed and becomes brittle and breaks.
  • Non-Patent Document 1 for example, accidents due to hydrogen absorption in a plant that handles non-oxidizing acids, or in a urea / ammonia environment or a hydrogen gas environment are reported. For this reason, a titanium alloy material excellent in hydrogen embrittlement resistance has been proposed.
  • Patent Document 1 discloses a titanium alloy containing 50% by volume or more of a ⁇ phase and containing 500 to 6000 ppm of hydrogen and having a large elongation at break. Even if it contains a large amount of hydrogen, it is brittle. An example is shown that does not.
  • the titanium material is usually manufactured by the method shown below.
  • the raw material titanium oxide is chlorinated to titanium tetrachloride by the crawl method, and then reduced with magnesium or sodium to produce a lump-like sponge-like metal titanium (sponge titanium).
  • This sponge titanium is press-molded to form a titanium consumable electrode, and a titanium ingot is manufactured by vacuum arc melting using the titanium consumable electrode as an electrode.
  • an alloy element is added as necessary to produce a titanium alloy ingot.
  • the titanium alloy ingot is divided, forged and rolled into a titanium slab, and the titanium slab is further subjected to hot rolling, annealing, pickling, cold rolling, and vacuum heat treatment to produce a titanium thin plate.
  • titanium ingot is smashed, hydroground, dehydrogenated, powder crushed, and classified to produce titanium powder, and titanium powder is powder-rolled, sintered, and cold-rolled.
  • the manufacturing method is also known.
  • Patent Document 2 discloses that a titanium powder is produced directly from sponge titanium, not a titanium ingot, and a titanium thin plate is produced from the obtained titanium powder.
  • Sintered compacts are manufactured by sintering pre-sintered compacts made of viscous compositions containing agents and solvents into thin sheets, and sintered compacts are manufactured by compacting the sintered compacts.
  • a method is disclosed in which the fracture elongation of the sintered thin plate is 0.4% or more, the density ratio is 80% or more, and the density ratio of the sintered compacted plate is 90% or more. ing.
  • Patent Document 3 discloses a composite powder obtained by adding an appropriate amount of iron powder, chromium powder or copper powder to titanium alloy powder using titanium alloy scrap or titanium alloy ingot as a raw material. After extruding the carbon steel capsule, the capsule on the surface of the obtained round bar is dissolved and removed, and further solution treatment or solution treatment and aging treatment are performed to produce a titanium alloy with excellent quality by the powder method A method is disclosed.
  • Patent Document 4 discloses a method in which a titanium sponge powder is filled in a copper capsule and then subjected to warm extrusion at an extrusion ratio of 1.5 or more and an extrusion temperature of 700 ° C. or less.
  • a method for producing a titanium molded body in which 20% or more of the total length of the grain boundary of the molded body is in metal contact is performed by performing outer peripheral processing excluding copper.
  • a pack rolling method is known as a technique for rolling the sheet.
  • the pack rolling method is a method in which a core material such as a titanium alloy having poor workability is covered with a cover material such as inexpensive carbon steel having good workability and hot rolling is performed.
  • a release agent is applied to the surface of the core material, and at least two upper and lower surfaces thereof are covered with a cover material, or the four peripheral surfaces are covered with a spacer material in addition to the upper and lower surfaces, and the surroundings are welded. Assembled and hot rolled.
  • a core material which is a material to be rolled, is covered with a cover material and hot rolled. Therefore, the core material surface does not directly contact a cold medium (atmosphere or roll), and the temperature drop of the core material can be suppressed, so that even a core material with poor workability can be manufactured.
  • Patent Document 5 discloses a method for assembling a hermetically sealed box
  • Patent Document 6 discloses a degree of vacuum of 10 ⁇ 3 torr or higher.
  • Patent Document 7 discloses a method of covering the carbon steel (cover material) with an order of 10 ⁇ 2 torr.
  • a method for producing a hermetic coated box by sealing by high energy density welding under the following vacuum is disclosed.
  • Patent Document 8 a steel material is used as a base material and titanium or a titanium alloy is used as a mating material, and the joint surface between the base material and the mating material is evacuated and then welded and assembled.
  • a method for manufacturing a titanium clad steel sheet in which an assembly slab for rolling is joined by hot rolling is disclosed.
  • Patent Document 9 discloses that pure nickel, pure iron, and carbon content are 0.01 mass% or less on the surface of a base steel material containing 0.03 mass% or more of carbon. After the titanium foil material is laminated by interposing an insert material made of any one of the above-mentioned low carbon steels with a thickness of 20 ⁇ m or more, a laser beam is irradiated from either side of the lamination direction, A method of manufacturing a titanium-coated steel material by melting and joining at least the vicinity of the edge with a base steel material over the entire circumference is disclosed.
  • JP-A-2015-045040 Patent Document 10
  • the surface of a porous titanium raw material (sponge titanium) formed into an ingot shape is melted using an electron beam under vacuum to make the surface layer portion dense titanium.
  • the titanium ingot is manufactured and hot rolled and cold rolled to form a porous portion in which the porous titanium raw material is formed into an ingot shape, and the entire surface of the porous portion composed of dense titanium.
  • a method for producing a dense titanium material (titanium ingot) having a dense coating portion for coating with very little energy is exemplified.
  • Patent Document 11 describes that a surface effect treatment of an engine member for an automobile is performed by thermal spraying.
  • JP 2013-163840 A JP 2011-42828 A JP 2014-19945 A JP 2001-131609 A JP-A-63-207401 Japanese Patent Laid-Open No. 09-136102 JP 11-057810 A Japanese Patent Laid-Open No. 08-141754 Japanese Patent Laid-Open No. 11-170076 Japanese Patent Laying-Open No. 2015-045040 JP 62-270277 A
  • Titanium processing technology edited by Japan Titanium Association, Nikkan Kogyo Shimbun, p. 214-230, issued in November 1992
  • sponge titanium is press-molded to form a titanium consumable electrode, and a titanium ingot is manufactured by vacuum arc melting using the titanium consumable electrode as an electrode.
  • the titanium slab was forged and rolled into a titanium slab, and the titanium slab was manufactured by hot rolling, annealing, pickling, and cold rolling.
  • a process of dissolving titanium and producing a titanium ingot was always added.
  • a method of producing titanium powder by powder rolling, sintering, and cold rolling is also known, but in the method of producing titanium powder from a titanium ingot, a step of dissolving titanium is also added.
  • the core material covered with the cover material is slab or ingot to the last, and has undergone a melting process or is made of expensive titanium powder, and the manufacturing cost cannot be reduced.
  • a dense titanium material can be manufactured with very little energy, but the surface of the titanium sponge formed into an ingot shape is dissolved, and the dense titanium surface layer portion and the internal components are the same kind of pure titanium. Or it is prescribed
  • thermal spraying is a method in which a film is formed by melting a metal, ceramics, or the like and spraying it on the surface of a titanium material.
  • thermal spraying is performed while shielding with an inert gas in order to avoid oxidation of the film.
  • inert gases are entrained in the pores of the coating.
  • Such pores containing the inert gas are not pressed by hot working or the like.
  • vacuum heat treatment is generally carried out, but during this treatment, the inert gas in the pores may expand and the film may be peeled off.
  • the abundance ratio (porosity) of pores generated by thermal spraying is several vol. % Or more and 10 vol. % May be exceeded.
  • a titanium material having a high porosity in the film has a risk of peeling in the manufacturing process, and there is a risk that a defect such as a crack during processing may occur.
  • melt resolidification process As a process for melting and resolidifying the surface layer of the slab using an electron beam. Usually, the melted and re-solidified surface layer is removed in a pickling step after hot rolling. For this reason, in the conventional melt resolidification treatment, no consideration is given to the segregation of the alloy components in the surface layer portion.
  • the present inventors specify the material for hot rolling at a low price by attaching a titanium plate containing a specific alloy element to the surface of a slab made of industrial pure titanium or titanium alloy. We considered obtaining a titanium material with excellent performance.
  • the content of alloying elements added to improve various properties required for titanium materials such as corrosion resistance, oxidation resistance, fatigue resistance, hydrogen embrittlement resistance, and neutron barrier properties (express target characteristics)
  • the purpose is to obtain a titanium composite material and hot rolling titanium material having desired characteristics at a low cost by reducing the production amount of a specific alloying element) and suppressing the production cost of the titanium material. .
  • the present invention has been made to solve the above-described problems, and the gist of the present invention is the following titanium composite material and titanium material for hot rolling.
  • an inner layer made of industrial pure titanium or titanium alloy A surface layer having a chemical composition different from that of the inner layer formed on at least one rolling surface of the inner layer; An intermediate layer formed between the inner layer and the surface layer and having a different chemical composition from the inner layer;
  • a titanium composite comprising: The surface layer has a thickness of 2 ⁇ m or more, and the proportion of the total thickness is 40% or less per side, The chemical composition of the surface layer part is One or more selected from Mo, V and Nb, the Mo equivalent calculated by the following formula (1) is more than 8.0 and less than 20.0, the balance being titanium and impurities, The intermediate layer has a thickness of 0.5 ⁇ m or more. Titanium composite material.
  • Mo equivalent Mo content (% by mass) + V content (% by mass) /1.5+Nb content (% by mass) /3.6 (1)
  • Another surface layer is formed on a surface other than the rolled surface of the inner layer,
  • the other surface layer has the same chemical composition as the surface layer,
  • a base material made of pure industrial titanium or a titanium alloy; A surface layer material joined to at least one rolling surface of the base material; A titanium material for hot rolling comprising a welded portion that joins the periphery of the base material and the surface layer material, The surface layer material has a different chemical composition from the base material, and One or more selected from Mo, V and Nb, the Mo equivalent calculated by the following formula (1) is more than 8.0 and less than 20.0, the balance being titanium and impurities, The welded portion shields the interface between the base material and the surface material from outside air; Titanium material for hot rolling.
  • Mo equivalent Mo content (% by mass) + V content (% by mass) /1.5+Nb content (% by mass) /3.6 (1)
  • the base material comprises a direct cast slab.
  • the directly cast slab is obtained by forming a melt-resolidified layer on at least a part of the surface.
  • the chemical composition of the melt-resolidified layer is different from the chemical composition of the center portion of the thickness of the direct cast slab, (6) Titanium material for hot rolling.
  • the titanium composite material according to the present invention includes an inner layer made of industrial pure titanium or a titanium alloy and a surface layer having a chemical composition different from that of the inner layer, the whole is compared with a titanium material made of the same titanium alloy. Thus, it has the same characteristics but can be manufactured at low cost.
  • FIG. 1 is an explanatory view showing an example of the configuration of a titanium composite material according to the present invention.
  • FIG. 2 is an explanatory view showing an example of the configuration of the titanium composite material according to the present invention.
  • FIG. 3 is an explanatory view schematically showing that the titanium rectangular slab and the titanium plate are bonded together by welding in a vacuum.
  • FIG. 4 is an explanatory view schematically showing bonding by welding a titanium plate not only on the surface of the titanium rectangular cast piece but also on the side surface.
  • FIG. 5 is an explanatory view showing a method of melt re-solidification.
  • FIG. 6 is an explanatory view showing a method of melt re-solidification.
  • FIG. 7 is an explanatory view showing a method of melt re-solidification.
  • the present inventors reduced the amount of a specific alloy element that expresses a target characteristic by alloying only the surface layer of the titanium plate of the final product, and As a result of diligent investigations to reduce the manufacturing cost, the interface between the base material made of industrial pure titanium or titanium alloy and the surface layer material having a chemical composition different from the base material is shielded from the outside air.
  • the titanium material for hot rolling which welded the circumference
  • the titanium composite material obtained by hot working the titanium material for hot rolling becomes a titanium material having excellent properties at low cost.
  • Titanium composite 1-1 The surface layers 3 and 4 which have a composition, and the intermediate
  • a surface layer is formed on one or both rolling surfaces of the inner layer 5, but a surface other than the rolling surface of the inner layer 5 (side surface in the example shown in FIGS. 1 and 2).
  • the surface layer, the inner layer, and the intermediate layer will be sequentially described.
  • the thickness is 2 ⁇ m or more, and the proportion of the total thickness is 40% or less per side.
  • the thickness of the surface layer is preferably 5 ⁇ m or more, and more preferably 10 ⁇ m or more.
  • the ratio of the thickness of the surface layer to the total thickness of the titanium composite is 40% or less per side, more preferably 30% or less, and particularly preferably 2 to 20%.
  • the layer for obtaining hydrogen absorption resistance is a titanium alloy layer containing a certain range of ⁇ -stabilizing elements.
  • the reason for prescribing the formation of the ⁇ phase is that the ⁇ phase of titanium forms a hydride even at a hydrogen concentration of only a few tens of ppm, whereas the ⁇ phase of the titanium alloy can dissolve about 1000 ppm or more of hydrogen, This is because it has the characteristic that it is difficult to cause embrittlement due to hydrogen.
  • ⁇ -stabilizing element such as Fe or Cr
  • titanium and these elements form a compound and cause embrittlement.
  • ⁇ -stabilizing elements when Mo, V, and Nb are contained in a range that satisfies “8.0 ⁇ Mo equivalent ⁇ 20.0”, the ⁇ -phase may be present even if Fe and Cr are present at the same time. Is stable and does not form a compound phase, and thus does not cause embrittlement.
  • the lower limit of the Mo equivalent is the amount of alloy necessary to obtain a sufficient amount of ⁇ phase.
  • the upper limit was determined because a titanium alloy with a large amount of alloy addition is not suitable for use because of its high cost.
  • the existing ⁇ -type titanium alloy can be used for forming the surface alloy layer.
  • inclusion of additive elements such as Cr, Sn, Al, and Zr other than the above elements is allowed if the total amount is 15% or less. This is because these elements are elements included for adjusting heat treatment property, strength, and cold workability in the existing ⁇ -type titanium alloy, and do not lower the Mo equivalent defined in the present invention.
  • Si, Fe and the like may be further contained.
  • Impurities can be contained within a range that does not hinder the target characteristics, and other impurities include Ta, Si, Mn, and Cu as impurity elements mainly mixed from scrap, and C, which are general impurity elements, In combination with N, Fe, O and H, a total amount of 5% or less is allowed.
  • Inner layer 5 is made of industrial pure titanium or a titanium alloy.
  • industrial pure titanium is used for the inner layer 5
  • the processability at room temperature is excellent as compared with a titanium material made entirely of the same titanium alloy.
  • the industrial pure titanium mentioned here is an industry defined by JIS standards 1 to 4 and ASTM standards Grades 1 to 4 and DIN standards 3, 7025, 3, 7035, and 37055. Contains pure titanium. That is, the industrial pure titanium targeted in the present invention is, for example, C: 0.1% or less, H: 0.015% or less, O: 0.4% or less, N: 0.07% or less, Fe: It consists of 0.5% or less and the balance Ti.
  • a titanium alloy may be used for the inner layer 5.
  • the alloy cost can be significantly reduced and high strength can be obtained.
  • any of an ⁇ -type titanium alloy, an ⁇ + ⁇ -type titanium alloy, and a ⁇ -type titanium alloy can be used according to a required application.
  • the ⁇ -type titanium alloy for example, a high corrosion resistance alloy (ASTM Grade 7, 11, 16, 26, 13, 30, 33, or a titanium material containing a small amount of JIS species corresponding thereto and various elements).
  • Examples of ⁇ + ⁇ type titanium alloys include Ti-6Al-4V, Ti-6Al-6V-2Sn, Ti-6Al-7V, Ti-3Al-5V, Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al. -2Sn-4Zr-6Mo, Ti-1Fe-0.35O, Ti-1.5Fe-0.5O, Ti-5Al-1Fe, Ti-5Al-1Fe-0.3Si, Ti-5Al-2Fe, Ti-5Al -2Fe-0.3Si, Ti-5Al-2Fe-3Mo, Ti-4.5Al-2Fe-2V-3Mo, or the like can be used.
  • ⁇ -type titanium alloy for example, Ti-11.5Mo-6Zr-4.5Sn, Ti-8V-3Al-6Cr-4Mo-4Zr, Ti-10V-2Fe-3Mo, Ti-13V-11Cr-3Al Ti-15V-3Al-3Cr-3Sn, Ti-6.8Mo-4.5Fe-1.5Al, Ti-20V-4Al-1Sn, Ti-22V-4Al, and the like can be used.
  • the titanium and titanium alloy used for the inner layer 5 desirably have a 0.2% proof stress of 1000 MPa or less.
  • the titanium composite material of the present invention includes an intermediate layer between the inner layer and the surface layer. That is, a titanium material for hot rolling, which will be described later, is a material in which a surface layer material is attached to a base material and the periphery thereof is welded. During the subsequent hot rolling and heat treatment processes after cold rolling, the base material and the surface layer When diffusion occurs at the interface with the material and the titanium composite material is finally finished, an intermediate layer is formed between the inner layer derived from the base material and the surface layer derived from the surface material. This intermediate layer has a chemical composition different from the chemical composition of the base material. This intermediate layer bonds the inner layer and the surface layer to each other and bonds them firmly. Further, since a continuous element gradient is generated in the intermediate layer, the difference in strength between the inner layer and the surface layer can be reduced, and cracks during processing can be suppressed.
  • the thickness of the intermediate layer can be measured using EPMA or GDS. If GDS is used, more detailed measurement is possible. In the case of GDS, after removing the surface layer to some extent by polishing, the thickness of the intermediate layer can be measured by performing GDS analysis in the depth direction from the surface.
  • the intermediate layer is the increased content from the base material (in the case of an element not included in the base material, its content, in the case of an element also included in the base material, the increase in content from the base material) ) Is C MID, and the average of the increased content in the surface layer portion is C AVE , it means a region of 0 ⁇ C MID ⁇ 0.8 ⁇ C AVE .
  • the thickness of this intermediate layer is 0.5 ⁇ m or more. On the other hand, if the thickness of the intermediate layer becomes too large, the surface alloy layer may become thin by that amount, and the effect may not be exhibited. Therefore, the upper limit is preferably 15 ⁇ m.
  • Titanium material for hot rolling is a material (slab of slab, bloom, billet, etc.) used for hot working, and after hot working, it can be cooled if necessary. It is processed into a titanium composite material by performing inter-processing, heat treatment, etc.
  • the titanium material for hot rolling according to the present invention will be described with reference to the drawings.
  • “%” regarding the content of each element means “mass%”.
  • FIG. 3 is an explanatory view schematically showing that the base material (titanium rectangular cast, slab) 6 and the surface layer material (titanium plate) 7 are bonded together in a vacuum, and FIG. It is typical to bond the surface materials (titanium plates) 7 and 8 not only to the surface (rolled surface) of the base material (titanium rectangular cast slab, slab) but also to the side surfaces (surfaces other than the rolled surface). It is explanatory drawing shown in.
  • titanium plates 7 and 8 containing alloy elements that exhibit characteristics are bonded to the surface of a slab 6 that is a base material, and then bonded by hot rolling cladding.
  • the surface layers of the titanium composite materials 1 and 2 are alloyed.
  • a titanium plate 7 may be bonded to only one side of the slab 6 in a vacuum as shown in FIG. 3, and the titanium plate 7 is attached to the other side of the slab 6. You may hot-roll without sticking.
  • a titanium plate 7 may be bonded to one side of the slab 6 as well as the other side. Thereby, generation
  • a plate containing an alloy element may be bonded to both rolling surfaces of the slab 6 as shown in FIG.
  • the same standard titanium plate 8 may be bonded together in a vacuum and welded to the side surface of the slab 6 that becomes the edge side during hot rolling.
  • the amount of the side surface of the slab 6 that wraps around during hot rolling varies depending on the manufacturing method, but is usually about 20 to 30 mm. Therefore, it is not necessary to attach the titanium plate 8 to the entire side surface of the slab 6, and the manufacturing method is not limited. It is only necessary to attach the titanium plate 8 only to the portion corresponding to the sneak amount.
  • titanium composites 1 and 2 are manufactured, they are manufactured through a shot-pickling process after hot rolling in order to remove the oxide layer formed by hot rolling. However, if the surface layer formed by the hot-rolled cladding is removed during this step, desired characteristics cannot be expressed.
  • the thickness of the surface layer of the titanium composites 1 and 2 becomes too thin, the desired desired characteristics will not be exhibited. On the other hand, if the thickness of the surface layer is too thick, the manufacturing cost increases accordingly. Since the titanium composite materials 1 and 2 only have to have a surface layer thickness suitable for the purpose of use, the thickness of the titanium plates 7 and 8 used as the material is not particularly limited, but the thickness of the slab 6 It is preferably in the range of 5 to 40%.
  • titanium plate As the surface layer material (titanium plate), a titanium plate having the predetermined chemical composition described in the section of the surface layer of the titanium composite material is used. In particular, it is desirable to adjust the chemical composition of the titanium plate to a component containing a predetermined element in the same component as the base material in order to suppress the plate breakage during hot rolling. .
  • Base material As the base material, the industrial pure titanium or titanium alloy described in the section of the inner layer of the titanium composite is used. In particular, it is preferable to use a direct casting slab as a base material.
  • the direct cast slab may be one in which a melt resolidified layer is formed on at least a part of the surface.
  • a predetermined element was added to the surface of the direct casting slab when the melt resolidification process was performed, and a melt resolidification layer having a chemical composition different from that of the center portion of the direct casting slab was formed. May be.
  • the slab 6 and the titanium plates 7 and 8 are welded at least around the welded portion 9 in a vacuum vessel.
  • the slab 6 and the titanium plates 7 and 8 are bonded together by sealing with a vacuum, blocking the outside air, and rolling.
  • the welded portion to be joined after the titanium plates 7 and 8 are bonded to the slab 6 is shielded from the atmosphere at the interface between the slab 6 and the titanium plates 7 and 8. Weld.
  • Titanium is an active metal and forms a strong passive film on the surface when left in the atmosphere. It is impossible to remove the oxidized layer on the surface. However, unlike stainless steel, etc., oxygen easily dissolves in titanium. Therefore, when heated in a vacuum and sealed without external oxygen supply, oxygen on the surface diffuses into the solid solution. Therefore, the passive film formed on the surface disappears. Therefore, the slab 6 and the titanium plates 7 and 8 on the surface thereof can be completely adhered by the hot rolling cladding method without generating any inclusions between them.
  • the slab 6 when an as-cast slab is used as the slab 6, surface defects occur in the subsequent hot rolling process due to coarse crystal grains generated during solidification.
  • the titanium plates 7 and 8 are bonded to the rolled surface of the slab 6 as in the present invention, the bonded titanium plate 7 has a fine structure, so that surface defects in the hot rolling process can be suppressed. .
  • a base material of a titanium material for hot rolling is usually manufactured by cutting and refining an ingot after making it into a slab or billet shape by breakdown. In recent years, rectangular slabs that can be hot-rolled directly at the time of ingot production are sometimes produced and used for hot-rolling. When manufactured by breakdown, since the surface is relatively flat by breakdown, it is easy to disperse the material containing the alloy element relatively uniformly, and it is easy to make the element distribution of the alloy phase uniform.
  • an ingot directly manufactured in the shape of a hot-rolling material during casting (direct casting slab)
  • the cutting and refining process can be omitted, so that it can be manufactured at a lower cost.
  • the ingot is manufactured and then used after the surface is cut and refined, the same effect can be expected when it is manufactured through breakdown.
  • an alloy layer may be stably formed on the surface layer, and an appropriate material may be selected according to the situation.
  • the slab and welding the surroundings After assembling the slab and welding the surroundings, it is heated to 700 to 850 ° C. and subjected to 10-30% joint rolling, and then heated at the ⁇ -zone temperature for 3 to 10 hours to diffuse the base material components to the surface layer. It is preferable to perform hot rolling later. This is because by performing hot rolling at a ⁇ -region temperature, the deformation resistance becomes low and rolling becomes easy.
  • the direct cast slab used as the base material may be one in which a melt resolidification layer is formed on at least a part of the surface.
  • a predetermined element was added to the surface of the direct casting slab when the melt resolidification process was performed, and a melt resolidification layer having a chemical composition different from that of the center portion of the direct casting slab was formed. May be.
  • the melt resolidification process will be described in detail.
  • FIGS. 5 to 7 are explanatory diagrams showing the method of melt re-solidification.
  • a method for melting and resolidifying the surface of the base material of the titanium material for hot rolling there are laser heating, plasma heating, induction heating, electron beam heating, etc., and any method may be used.
  • electron beam heating since it is performed in a high vacuum, even if a void or the like is formed in this layer during the melt resolidification treatment, it can be made harmless by pressure bonding in subsequent rolling because it is a vacuum.
  • the degree of vacuum in the case of melting in a vacuum is desirably higher than 3 ⁇ 10 ⁇ 3 Torr.
  • the processing time becomes longer and the cost increases.
  • the melt resolidification method of the surface layer is carried out as shown in FIG. 5 in the case of a rectangular slab. That is, among the outer surfaces of the rectangular slab 10, at least two wide surfaces 10A and 10B that become the rolling surfaces (surfaces in contact with the hot rolling roll) in the hot rolling process are irradiated with an electron beam, and the surfaces on the surfaces are irradiated. Only melt the layer.
  • the surface 10A is one of the two surfaces 10A and 10B.
  • the area of the electron beam irradiation region 14 by the single electron beam irradiation gun 12 on the surface 10A of the rectangular slab 10 is compared with the total area of the surface 10A to be irradiated.
  • the electron beam irradiation is actually performed while continuously moving the electron beam irradiation gun 12 or continuously moving the rectangular slab 10. It is normal.
  • the shape and area of this irradiation area can be adjusted by adjusting the focus of the electron beam or by using an electromagnetic lens to oscillate a small beam at a high frequency (oscillation Oscillation) to form a beam bundle. can do.
  • the moving direction of the electron beam irradiation gun is not particularly limited, it is generally continuous along the length direction (usually the casting direction D) or the width direction (usually the direction perpendicular to the casting direction D) of the rectangular slab 10.
  • the irradiation region 14 is continuously irradiated in a band shape with a width W (in the case of a circular beam or beam bundle, a diameter W).
  • the electron beam irradiation is performed in a belt shape while continuously moving the irradiation gun 12 in the reverse direction (or the same direction) in the adjacent unirradiated belt region.
  • a plurality of irradiation guns may be used to simultaneously perform electron beam irradiation on a plurality of regions.
  • FIG. 5 the case where a rectangular beam is continuously moved along the length direction (usually casting direction D) of the rectangular slab 10 is shown.
  • the surface (surface 10A) of the rectangular titanium cast piece 10 is irradiated with an electron beam by such a surface heat treatment step and heated to melt the surface, the rectangular titanium as shown in the left side of the center of FIG.
  • the surface layer of the surface 10A of the slab 10 is melted at the maximum by a depth corresponding to the heat input.
  • the depth from the direction perpendicular to the irradiation direction of the electron beam is not constant as shown in FIG. 7, and the depth becomes the largest at the central part of the electron beam irradiation, and the thickness increases toward the strip-shaped end part. Decreases, resulting in a downwardly convex curved shape.
  • the surface layer is melted and re-solidified with a material composed of the target alloy element, whereby the surface layer of the material for hot rolling can be alloyed to form an alloy layer having a chemical composition different from that of the base material.
  • a material used in this case one or more of powder, chip, wire, thin film, cutting powder, and mesh may be used.
  • the component and amount of the material to be arranged before melting are determined so that the component in the element concentration region after melting and solidifying together with the material surface becomes the target component.
  • the melt resolidification treatment After the melt resolidification treatment, it is preferable to hold at a temperature of 100 ° C. or higher and lower than 500 ° C. for 1 hour or longer. If it is cooled rapidly after melting and resolidification, fine cracks may occur in the surface layer due to strain during solidification. In the subsequent hot rolling process and cold rolling process, the fine cracks may be the starting point, and the surface layer may be peeled off, or the part of the alloy layer may be partially thin. Further, if the inside is oxidized due to fine cracks, it is necessary to remove in the pickling process, and the thickness of the alloy layer is further reduced. By maintaining at the above temperature, fine cracks on the surface can be suppressed. At this temperature, atmospheric oxidation hardly occurs even if the temperature is maintained.
  • a titanium material for hot rolling can be manufactured by attaching a titanium plate containing a predetermined alloy component to the surface of a base material provided with a surface layer portion formed by melt resolidification treatment.
  • the titanium material for hot rolling is preferably bonded to the slab 6 and the titanium plates 7 and 8 which are welded in advance by the hot rolled clad method.
  • the titanium plates 7 and 8 containing alloy elements that express characteristics are bonded to the surface layer of the slab 6, and then bonded by hot rolling cladding to alloy the surface layer of the titanium composite material.
  • the slab 6 and the titanium plate 7 are preferably welded at least around the welded portion 9 in a vacuum vessel.
  • the space between the slab 6 and the titanium plate 7 is bonded together by vacuum sealing and rolling.
  • the entire circumference is welded so that air does not enter between the slab 6 and the titanium plate 7.
  • Titanium is an active metal and forms a strong passive film on the surface when left in the atmosphere. It is impossible to remove the oxidized layer on the surface. However, unlike stainless steel, etc., oxygen easily dissolves in titanium. Therefore, when heated in a vacuum and sealed without external oxygen supply, oxygen on the surface diffuses into the solid solution. Therefore, the passive film formed on the surface disappears. For this reason, the slab 6 and the titanium plate 7 on the surface thereof can be completely adhered by the hot rolling cladding method without generating any inclusions between them.
  • the slab 6 when an as-cast slab is used as the slab 6, surface defects occur in the subsequent hot rolling process due to coarse crystal grains generated during solidification.
  • the titanium plate 7 when the titanium plate 7 is bonded to the rolled surface of the slab 6 as in the present invention, the bonded titanium plate 7 has a fine structure, so that surface defects in the hot rolling process can be suppressed.
  • titanium plates 7 may be bonded to both sides of the slab 6 instead of just one side. Thereby, generation
  • hot rolling at least a part of the side surface of the slab 6 usually wraps around the surface side of the hot-rolled sheet by being rolled down by the slab 6. Therefore, if the structure of the surface layer on the side surface of the slab 6 is coarse or a large number of defects exist, surface flaws may occur on the surface near both ends in the width direction of the hot-rolled sheet.
  • the same standard titanium plate 8 is preferably bonded and welded to the side surface of the slab 6 on the edge side during hot rolling as well as the rolled surface. Thereby, generation
  • This welding is preferably performed in a vacuum.
  • the amount of the side surface of the slab 6 that wraps around during hot rolling varies depending on the manufacturing method, but is usually about 20 to 30 mm. Therefore, it is not necessary to attach the titanium plate 8 to the entire side surface of the slab 6, and the manufacturing method is not limited. It is only necessary to attach the titanium plate 8 only to the portion corresponding to the sneak amount.
  • the base material-derived component can be contained in the titanium composite material. For example, heat treatment at 700 to 900 ° C. for 30 hours is exemplified.
  • Methods for welding the slab 6 and the titanium plates 7 and 8 in vacuum include electron beam welding and plasma welding.
  • the electron beam welding can be performed under a high vacuum
  • the space between the slab 6 and the titanium plates 7 and 8 can be made a high vacuum, which is desirable.
  • the degree of vacuum when the titanium plates 7 and 8 are welded in a vacuum is desirably a higher degree of vacuum of 3 ⁇ 10 ⁇ 3 Torr or less.
  • the slab 6 and the titanium plate 7 are not necessarily welded in a vacuum vessel.
  • a vacuum suction hole is provided in the titanium plate 7 and the titanium plate 7 is overlapped with the slab 6. Later, the slab 6 and the titanium plate 7 may be welded while evacuating the slab 6 and the titanium plate 7 using a vacuum suction hole, and the vacuum suction hole may be sealed after welding.
  • the thickness and chemical composition of the surface layer are as follows: It depends on the thickness of the titanium plates 7 and 8 before bonding and the distribution of alloy elements.
  • the annealing treatment is performed in a vacuum atmosphere or the like in order to obtain the finally required strength and ductility.
  • a concentration gradient is generated in the depth direction.
  • the diffusion distance of the element generated in the final annealing step is about several ⁇ m, and the entire thickness of the alloy layer does not diffuse, and does not affect the concentration of the alloy element in the vicinity of the surface layer, which is particularly important for property development.
  • titanium plates 7 and 8 the uniformity of the alloy components in the entire titanium plates 7 and 8 leads to stable expression of the characteristics.
  • titanium plates 7 and 8 manufactured as products it is possible to use titanium plates 7 and 8 manufactured as products, so it is easy to control the segregation of alloy components as well as the plate thickness accuracy, and have a uniform thickness and chemical properties after manufacturing. Titanium composite materials 1 and 2 having a surface layer having components can be produced, and stable characteristics can be expressed.
  • Hot rolling process Also in the hot rolling process, if the surface temperature is too high, a large amount of scale is generated during sheet passing, and the scale loss increases. On the other hand, if it is too low, the scale loss is reduced, but surface flaws are likely to occur. Therefore, it is necessary to remove by surface pickling, and it is desirable to perform hot rolling in a temperature range in which surface flaws can be suppressed. . Therefore, it is desirable to perform rolling in the optimum temperature range. In addition, since the surface temperature of the titanium material decreases during rolling, it is desirable to minimize roll cooling during rolling and suppress the decrease in the surface temperature of the titanium material.
  • the hot-rolled plate has an oxide layer on its surface
  • the oxide layer is generally removed by pickling with a nitric hydrofluoric acid solution.
  • the surface may be ground by grinding with a grindstone after pickling.
  • a two-layer or three-layer structure including an inner layer and a surface layer derived from the base material and the surface layer portion of the titanium material for hot rolling may be used.
  • a shot blast treatment is performed as a pretreatment for the pickling treatment to remove a part of the scale on the surface, and at the same time, cracks are formed on the surface, and in the subsequent pickling step The liquid penetrates into the cracks and removes part of the base material.
  • a titanium alloy plate with a thickness of 3 mm is attached to the upper and lower surfaces of a slab made of two types of industrial pure titanium JIS with a thickness of 60 mm, a width of 100 mm, and a length of 120 mm by electron beam welding in a vacuum atmosphere of 3 ⁇ 10 ⁇ 3 Torr or less. Combined. Thereafter, it was heated to 850 ° C. and hot rolled to a plate thickness of 4.8 to 5.0 mm. Next, annealing was performed in a vacuum atmosphere at 600 to 650 ° C. for 4 to 10 hours. Furthermore, shot blasting and pickling were performed to remove the scale layer.
  • the titanium composite plate 2 shown in FIG. 2 in which the surface layers 3 and 4 are made of a Ti alloy and the inside 5 is made of industrial pure titanium JIS type 2 by the above-described hot-rolled cladding was used.
  • an industrial pure titanium JIS type 2 material having no surface layers 3 and 4 was used. Both plate thicknesses are 4.8-5 mm.
  • the titanium composite plate 2 of the present invention example and the titanium plate of the comparative example were exposed at 400 to 500 ° C. for 5 hours in a 1% by volume H 2 + 99% Ar atmosphere as a hydrogen absorption environment.
  • an impact test piece of 4.8 to 5 mm ⁇ 10 mm ⁇ 55 mm and 2 mm V notch was produced with the notch direction as the plate thickness penetration direction. Then, an impact value was calculated by dividing the impact absorption energy measured in the Charpy impact test by the cross-sectional area of the test piece fracture portion, and the hydrogen embrittlement characteristics were evaluated based on the value.
  • the manufactured titanium composite plate was embedded in a resin so that the cross section could be observed, polished and corroded, and then observed with an optical microscope to measure the thickness of the surface layer.
  • the measured thickness of the surface layer was divided by the total thickness of the titanium composite material to calculate the surface layer occupation rate.
  • the surface layer occupation ratio in this example was in the range of 3 to 5%.
  • Table 1 shows the exposure conditions, hydrogen concentration, and impact absorption energy for ordinary industrial pure titanium having no surface layers 3 and 4.
  • the impact value obtained by dividing the impact absorption energy by the cross-sectional area of the specimen decreased to less than 2.0 ⁇ 10 2 J / cm 2 .
  • the hydrogen concentration is sufficiently low, it is 2.7 ⁇ 10 2 J / cm 2, which is a decrease of 20% or more.
  • the test results are summarized in Table 2.
  • the element concentration in the surface layer portion in Table 2 is a result of performing line analysis using EPMA and averaging the range from the surface to the lower end of the alloy layer.
  • the exposure conditions under a hydrogen environment are all 500 ° C. for 5 hours. It corresponds to 3.
  • the Ti alloys of the surface layers 3 and 4 contain Mo alone. In Nos. 6 to 9, Ti alloys of the surface layers 3 and 4 contain V alone. In Nos. 10 to 15, the Ti alloys of the surface layers 3 and 4 contain a combination of two or more of Mo, V and Nb.
  • the present invention is No.
  • the impact values of 2 to 4 and 7 to 14 are as high as 2.4 to 2.8 ⁇ 10 2 J / cm 2 , indicating that they have excellent hydrogen embrittlement resistance.
  • No. which is a comparative example. 1 has an impact value as small as 1.4 J ⁇ 10 2 / cm 2 because the Mo equivalent is as low as 4.
  • No. which is a comparative example. 5 has a high Mo equivalent of 22, and an impact value as small as 1.8 J ⁇ 10 2 / cm 2 .
  • No. which is a comparative example. 6 has a low Mo equivalent of 6.7 and an impact value as small as 1.8 J ⁇ 10 2 / cm 2 .
  • No. 15 has a low Mo equivalent of 5.8 and an impact value as small as 1.7 J ⁇ 10 2 / cm 2 .
  • the titanium composite plate 2 according to the present invention has extremely excellent hydrogen embrittlement resistance as compared with the titanium plate of the comparative example.
  • Thickness 60 mm, width 100 mm, the upper and lower surfaces of the titanium slab made of commercially pure titanium two lengths 120 mm, the titanium alloy Ti-15V-3Cr-3Sn- 3Al sheet having a thickness of 1 ⁇ 25mm, 3 ⁇ 10 - Bonding was performed by electron beam welding in a vacuum atmosphere of 3 Torr or less. Thereafter, it was heated to 850 ° C. and hot rolled to a plate thickness of 4.8 to 5.0 mm. Next, annealing was performed in a vacuum atmosphere at 600 to 650 ° C. for 4 to 10 hours. Furthermore, shot blasting and pickling were performed to remove the scale layer.
  • Example 2 Thereafter, as in Example 1, after exposure at 400 to 500 ° C. for 5 hours in a 1% by volume H 2 + 99% Ar atmosphere, which is a hydrogen absorption environment, a Charpy impact test piece was collected, the impact value was calculated, and hydrogen embrittlement was calculated. The crystallization properties were evaluated.
  • a titanium alloy Ti-15V-3Cr-3Sn-3Al plate having a thickness of 5 mm is formed on the upper and lower surfaces of a titanium slab made of a titanium alloy Ti-1Fe-0.35O having a thickness of 60 mm, a width of 100 mm, and a length of 120 mm.
  • a titanium slab made of a titanium alloy Ti-1Fe-0.35O having a thickness of 60 mm, a width of 100 mm, and a length of 120 mm.
  • Were bonded together by electron beam welding in a vacuum atmosphere of 3 ⁇ 10 ⁇ 3 Torr or less. Thereafter, it was heated to 850 ° C. and hot-rolled to a thickness of 4.8 to 5.0 mm.
  • annealing was performed in a vacuum atmosphere at 600 to 650 ° C. for 4 to 10 hours. Furthermore, shot blasting and pickling were performed to remove the scale layer.
  • the impact value of the Ti-1Fe-0.35O alloy not having the surface layers 3 and 4 when not exposed to a hydrogen environment was 0.38 ⁇ 10 2 J / cm 2 .
  • No. which is a comparative example. 1 is a case where the surface layers 3 and 4 are not provided, and the impact value is as low as 0.25 ⁇ 10 2 J / cm 2 .
  • the slab which is the base material for producing the titanium composite material 2 having the surface layers 3 and 4 containing a predetermined alloy, is cut by hot forging an industrial pure titanium ingot produced by vacuum arc melting.
  • the produced 124 mm-thick slab was used.
  • the chemical composition of the titanium ingot in this example is in the range of O: 0.030 to 0.090% and Fe: 0.020 to 0.060%.
  • a pure molybdenum plate with a thickness of 1 mm is placed on the slab surface, the slab surface is melted to a depth of 3 to 15 mm together with the molybdenum plate by electron beam heating, and a region where the solid solution of Mo is dissolved to a depth of 3 to 15 mm is formed on the entire surface of the slab. It was.
  • the slab was heated to 850 ° C. and hot-rolled to a thickness of 5 mm, and then descaling was performed on both the front and back surfaces using shot blasting and nitric hydrofluoric acid. Heat treatment was performed in a vacuum or an inert gas atmosphere to 600 to 700 ° C. and held for 240 minutes.
  • a hot rolling, descaling and heat treatment steps were similarly performed using a titanium slab having no surface layers 3 and 4 to produce a comparative example.
  • Each titanium plate produced above was exposed at 500 ° C. for 5 hours in a 1% by volume H 2 + 99% by volume Ar atmosphere as a hydrogen absorption environment.
  • an impact test piece having a thickness (4.8 to 5.0 mm) ⁇ 10 mm ⁇ 55 mm and 2 mmV notch was prepared.
  • the longitudinal direction of the test piece was the rolling direction, and the notch direction was the plate thickness penetration direction. Hydrogen brittleness was evaluated by impact value.
  • the alloy element concentrations of the surface layers 3 and 4 are average values as a result of performing a line analysis on the range from the surface to the lower end of the alloy concentrated portion using EPMA.
  • the remainder is a component contained in industrial pure titanium except for contamination components such as O and C. The results are summarized in Table 5.
  • Nos. 3 to 5 have Mo equivalents of the surface layers 3 and 4 of 8.3 to 17% and a ratio of the alloy layer thickness to the plate thickness of 8.1 to 19%, satisfying the scope of the present invention and having an impact value of 2. 4 to 2.6 ⁇ 10 2 J / cm 2 and 2.0 J / cm 2 or more.
  • Mo, V, Nb powder is sprinkled on the slab surface, the slab surface is melted to a depth of 2 to 8 mm together with the alloy powder by electron beam heating, and a depth of 2 to 8 mm is obtained on the entire surface of the slab layer where the alloy elements are dissolved. Formed.
  • the slab was heated to 850 ° C. and hot-rolled to a thickness of 5 mm, and then descaling treatment was performed on both the front and back surfaces using shot blasting and nitric hydrofluoric acid. Heat treatment was performed in a vacuum or an inert gas atmosphere to 600 to 700 ° C. and held for 240 minutes.
  • Each titanium plate produced above was exposed at 500 ° C. for 5 hours in a 1% by volume H 2 + 99% by volume Ar atmosphere as a hydrogen absorption environment.
  • the alloy element concentration of the surface layers 3 and 4 is an average value as a result of performing a line analysis on the range from the surface to the alloy concentrated portion using EPMA.
  • the remainder is a component contained in industrial pure titanium except for contamination components such as O and C.
  • the exposure conditions under a hydrogen environment are all 500 ° C. and 5 hours. It corresponds to 3.
  • the results are summarized in Table 6.
  • Each of Nos. 1 to 7 has a surface layer occupation ratio (ratio of the thickness of the alloy layer to the total thickness) of 3 to 5%, which satisfies the scope of the present invention.
  • No. which is an example of the present invention. 1 includes Mo and V of 11.3 in Mo equivalent, and the impact value is 2.0 ⁇ 10 2 J / cm 2 or more.
  • No. which is an example of the present invention. 3 includes Mo, 11.2 Mo, V, and Nb in terms of Mo equivalent, and the impact value is 2.0 ⁇ 10 2 J / cm 2 or more.
  • No. which is an example of the present invention. 4 includes 10.0 V in Mo equivalent and an impact value of 2.0 ⁇ 10 2 J / cm 2 or more.
  • 6 contains Mo and Nb of 14.0 in terms of Mo, and the impact value is 2.0 ⁇ 10 2 J / cm 2 or more.
  • No. which is a comparative example. 7 contained only 4.0 Mo in terms of Mo, and the impact value was less than 2.0 ⁇ 10 2 J / cm 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

L'invention concerne un matériau composite de titane (1) qui comporte: une couche interne (5) constituée d'un titane industriel pur ou d'un alliage de titane ; une couche superficielle (3) qui est formée sur au moins une surface de la couche interne (5), et qui possède une composition chimique différente de celle de la couche interne (5) ; et une couche intermédiaire qui est formée entre la couche interne (5) et la couche superficielle (3), et qui possède une composition chimique différente de celle de la couche interne (5). La couche superficielle (3) présente une épaisseur supérieure ou égale à 2μm, et la proportion de toute l'épaisseur du matériau composite représentée par une surface la la couche superficielle (3) est inférieure ou égale à 40% . L'épaisseur de la couche intermédiaire est supérieure ou égale à 0,5μm. La composition chimique de la couche superficielle (3) est telle qu'au moins un élément choisi parmi Fe, Cr, Ni, Al et Zr représente 0,08 à 1,0%, le reste étant constitué de titane et d'impuretés. Ce matériau de titane pour laminage à chaud possède les caractéristiques requises indépendamment de son bas coût.
PCT/JP2016/072342 2015-07-29 2016-07-29 Matériau composite de titane et matériau de titane pour laminage à chaud Ceased WO2017018520A1 (fr)

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JP2019181563A (ja) * 2018-04-04 2019-10-24 ザ・ボーイング・カンパニーＴｈｅＢｏｅｉｎｇ Ｃｏｍｐａｎｙ 疲労寿命向上のための異種チタン合金溶加材を利用した溶接チタン構造体
CN115739993A (zh) * 2022-11-18 2023-03-07 浙江申吉钛业股份有限公司 一种宽幅钛合金板的制备方法
CN119972795A (zh) * 2025-02-21 2025-05-13 河南鑫宽重工科技有限公司 一种防止钛钢复合板晶粒生长的生产工艺

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TWI730190B (zh) * 2017-10-26 2021-06-11 日商日本製鐵股份有限公司 鈦熱軋板的製造方法

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JP2019181563A (ja) * 2018-04-04 2019-10-24 ザ・ボーイング・カンパニーＴｈｅＢｏｅｉｎｇ Ｃｏｍｐａｎｙ 疲労寿命向上のための異種チタン合金溶加材を利用した溶接チタン構造体
JP7299038B2 (ja) 2018-04-04 2023-06-27 ザ・ボーイング・カンパニー 疲労寿命向上のための異種チタン合金溶加材を利用した溶接チタン構造体
CN115739993A (zh) * 2022-11-18 2023-03-07 浙江申吉钛业股份有限公司 一种宽幅钛合金板的制备方法
CN119972795A (zh) * 2025-02-21 2025-05-13 河南鑫宽重工科技有限公司 一种防止钛钢复合板晶粒生长的生产工艺

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