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WO2018037810A1 - Composant de machine et matériau extrudé - Google Patents

Composant de machine et matériau extrudé Download PDF

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Publication number
WO2018037810A1
WO2018037810A1 PCT/JP2017/026693 JP2017026693W WO2018037810A1 WO 2018037810 A1 WO2018037810 A1 WO 2018037810A1 JP 2017026693 W JP2017026693 W JP 2017026693W WO 2018037810 A1 WO2018037810 A1 WO 2018037810A1
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WO
WIPO (PCT)
Prior art keywords
mass
extruded material
less
aluminum alloy
extrusion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/026693
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English (en)
Japanese (ja)
Inventor
有賀　康博
琢哉 高知
孝太郎 豊武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Shinko Metal Products Co Ltd
Original Assignee
Kobe Steel Ltd
Shinko Metal Products Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Kobe Steel Ltd, Shinko Metal Products Co Ltd filed Critical Kobe Steel Ltd
Publication of WO2018037810A1 publication Critical patent/WO2018037810A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent

Definitions

  • the present disclosure relates to a machine part made of an aluminum alloy and an extruded material. More specifically, the present invention relates to a machine part and an extruded material made of a 7000 series aluminum alloy.
  • Al—Zn—Mg—Cu-based aluminum alloys having excellent strength, corrosion resistance and light weight hereinafter, Extruded material made of 7000 series aluminum alloy is sometimes used.
  • Extruded materials made of a 7000 series aluminum alloy have high strength, and various types of materials having a tensile strength of 700 MPa or higher by T6 refining after extrusion have been proposed.
  • Patent Document 1 discloses that a 7000 series aluminum alloy wire rod extruded material having a Zn content exceeding 8 mass% can be easily imparted with a strength exceeding a tensile strength of 720 MPa by aging treatment.
  • a coarse recrystallized grain layer is formed, which causes cracking when the extruded material is subjected to plastic processing (forming processing) such as forging or rolling into a large-diameter bolt. .
  • plastic processing forming processing
  • the extrusion temperature is made at a relatively low temperature of 480 to 500 ° C.
  • the inside of the extruded 7000 series aluminum alloy has a fibrous structure
  • the thickness of the recrystallized layer of the surface layer is 10% or less
  • the recrystallized grain size is controlled to 150 ⁇ m or less.
  • the extrusion temperature is a relatively low temperature of 480 to 500 ° C. as in Patent Document 2
  • the 7000 series aluminum alloy is also recrystallized in the extrusion in this temperature range.
  • recrystallization inside is inevitable, and there is a possibility that a strength of 700 MPa or more cannot be obtained with good reproducibility and tensile strength.
  • Patent Document 3 discloses manufacturing a 7000 series aluminum alloy extruded material by hot isostatic pressing.
  • the average crystal grain size of the recrystallized grains in the surface layer portion of the extruded material is 100 ⁇ m or less as a cross-sectional structure parallel to the extrusion direction passing through the axial center portion of the extruded material in the extruded state.
  • the average intercept length in the radial direction of the crystal grains in the central portion of the extruded material axis is 35 ⁇ m or less
  • the average area ratio of the ⁇ 111> orientation crystal grains in the extrusion direction is 0.5 or more and 1.0 or less.
  • the ratio ⁇ 001> / ⁇ 111> between the average area ratio of ⁇ 001> oriented crystal grains and the average area ratio of ⁇ 111> oriented crystal grains is 0.25 or less.
  • Patent Document 3 as a result of the structure of the extruded material that has not been subjected to any heat treatment or processing other than cooling from the extrusion temperature after completion of the hot extrusion, and remains extruded (extruded), the surface layer In addition to the portion, recrystallization (recrystallization) inside the extruded material is also suppressed.
  • a fine extruded structure (fibrous structure) is obtained and a high strength of 700 MPa or more is obtained as a tensile strength after artificial aging treatment.
  • the tensile strength after the artificial aging treatment obtained is 700 MPa or more, but it is only less than about 800 MPa.
  • Patent Document 4 discloses a 7000 series aluminum alloy rolled plate for automobile structural members such as frames and pillars, not extruded materials.
  • the average crystal grain size is 15 ⁇ m or less, and the average proportion of the low-angle grain boundaries with an inclination of 5 to 15 ° is 15% or more. It has also been proposed that the average proportion of grain boundaries with a large tilt angle exceeding 15 ° is 15 to 50%.
  • the tensile strength after the obtained artificial aging treatment is less than 500 MPa as shown in Table 2 of Examples, and such a metallurgical method using a rolled sheet is a plastic working method and manufacturing. Whether or not the method is really effective for increasing the strength of 800 MPa or more of different extruded materials and machine parts can only be confirmed by actually testing.
  • the conventional 7000 series aluminum alloy extruded material can achieve a certain level of strength, it is difficult to stably obtain sufficient strength as a material for mechanical parts such as bolts and springs that require high strength. There was a case.
  • An embodiment of the present invention has been made to solve such a problem, and the purpose thereof is a 7000 series in which the tensile strength after artificial aging treatment is 800 MPa or more and the total elongation is 5% or more. It is to provide a mechanical part made of an aluminum alloy, and to provide a 7000 series aluminum alloy extruded material capable of producing a mechanical part having such excellent mechanical properties.
  • Zn 8.0 to 14.0 mass%
  • Mg 2.0 to 4.0 mass%
  • Cu 0.5 to 2.0 mass%
  • Mn 0.2 to 1 .5% by mass
  • Zr 0.05 to 0.3% by mass
  • the balance is a mechanical part made of an aluminum alloy containing Al and unavoidable impurities, with crystal grains measured by X-ray small angle scattering.
  • the average particle diameter of the fine particles is 2 nm or more and 7 nm or less, the normalized dispersion of the particle size distribution is 45% or less, the tensile strength is 800 MPa or more, and the total elongation is 5% or more. It is a part.
  • Aspect 2 of the present invention is the mechanical component according to aspect 1, further containing one or two of Cr: 0.05 to 0.3% by mass and Sc: 0.05 to 0.3% by mass. .
  • Aspect 3 of the present invention is the mechanical part according to Aspect 1 or 2, further comprising one or two of Ag: 0.05 to 0.5 mass% and Sn: 0.01 to 0.2 mass%. It is.
  • Zn 8.0 to 14.0% by mass
  • Mg 2.0 to 4.0% by mass
  • Cu 0.5 to 2.0% by mass
  • Mn 0.2 to 1 .5 mass%
  • Zr 0.05 to 0.3 mass%
  • the balance is an extrusion material for machine parts made of an aluminum alloy containing Al and unavoidable impurities. Is a wire rod extruded material having a circular diameter of 25 mm, and drawn to a wire rod material having a circular area of 10 mm ⁇ with an area reduction rate of 84%, and this wire rod material is held at a temperature of 480 ° C. for 5 hours. After solution treatment, quenching treatment was performed at an average cooling rate of up to 50 ° C.
  • the average particle diameter of the fine particles is 2 nm or more and 7 nm or less. Dispersion is 45% or less, a tensile strength of at least 800 MPa, an extruded material, wherein the total elongation is 5% or more.
  • Aspect 5 of the present invention is the extruded material according to aspect 4, further containing one or two of Cr: 0.05 to 0.3% by mass and Sc: 0.05 to 0.3% by mass. .
  • Aspect 6 of the present invention is the extruded material according to aspect 4 or 5, further comprising one or two of Ag: 0.05 to 0.5% by mass and Sn: 0.01 to 0.2% by mass. It is.
  • a mechanical component made of a 7000 series aluminum alloy having a tensile strength after artificial aging treatment of 800 MPa or more and a total elongation of 5% or more, and such an excellent machine. It is possible to provide a 7000 series aluminum alloy extruded material capable of producing mechanical parts having specific characteristics.
  • the inventors of the present invention can manufacture a mechanical part made of a 7000 series aluminum alloy having sufficiently excellent mechanical characteristics as a mechanical part such as a bolt and a spring, and 7000 capable of manufacturing a mechanical part having such excellent mechanical characteristics.
  • a mechanical part such as a bolt and a spring
  • 7000 capable of manufacturing a mechanical part having such excellent mechanical characteristics.
  • the present inventors have determined that the precipitates present at the grain boundaries by controlling the average particle diameter of the fine particles in the grains measured by X-ray small angle scattering and the normalized dispersion of the grain size distribution. From a 7000 series aluminum alloy having a tensile strength after artificial aging treatment of 800 MPa or more and a total elongation of 5% or more. It has been found that mechanical parts can be provided.
  • Machine parts refers to various parts such as bolt and nut thread parts, gears (shafts), bearings (bearings), and springs (springs) made of extruded material. It is a machine element as a functional unit of the smallest unit commonly used in various machines.
  • after artificial aging treatment means “after solution treatment and quenching treatment and artificial aging treatment”.
  • the mechanical component according to the embodiment of the present invention can be manufactured using the extruded material according to the embodiment of the present invention as a raw material as described later. Therefore, the mechanical component according to the embodiment of the present invention has fine nano-sized precipitates (in the present specification, sometimes referred to as fine particles), similar to the extruded material according to the embodiment of the present invention. Many exist in the crystal grains and achieve high strength.
  • This fine particle is an intermetallic compound of Mg and Zn (composition is MgZn 2 or the like) formed in the crystal grain, and further contains contained elements such as Cu and Zr according to other alloy compositions. It is a finely dispersed phase.
  • the size of the fine particles referred to in the embodiment of the present invention means an equivalent circle diameter of fine particles that are indefinite.
  • the mechanical part according to an embodiment of the present invention is an extruded fine structure after artificial aging treatment, an average particle diameter of fine particles in crystal grains measured by X-ray small angle scattering, a normalized dispersion of particle size distribution, By controlling the ratio, it is possible to achieve both excellent strength and elongation.
  • the structure after artificial aging treatment of a machine part manufactured by cold working a 7000 series aluminum alloy extrudate, which is a raw material is a fine particle size measured in a crystal grain by the X-ray small angle scattering method.
  • the average particle diameter of the distribution is controlled to be 2 nm or more and 7 nm or less, and the normalized dispersion of the particle size distribution is controlled to be 45% or less.
  • the tensile strength after aging treatment is 800 MPa or more. High strength can be achieved. At the same time, it is possible to suppress the precipitation of precipitates existing at the grain boundaries and coarse precipitates existing within the crystal grains, thereby achieving excellent strength and excellent elongation.
  • Average particle diameter 2 nm or more and 7 nm or less If the average particle diameter of the fine particles is too small, since the action as an obstacle to dislocation during deformation is small, high strength cannot be achieved. Therefore, the average particle diameter is 2 nm or more, preferably 3 nm or more. On the other hand, if the average particle diameter of the fine particles is too large, the distance between the particles becomes large and the action as an obstacle to dislocation becomes small. Furthermore, the production
  • Normalized dispersion of particle size distribution is an index indicating the spread of particle distribution. That is, when the normalized dispersion is large, it means that the particles are widely distributed from small particles to large particles. Conversely, when the normalized dispersion is small, it means that the difference between large particles and small particles is relatively small.
  • the normalized dispersion of the particle size distribution is 45% or less, preferably 40% or less. Note that the normalized dispersion of the particle size distribution has a production limit even by controlling the composition and heat treatment, and the lower limit can be reduced only to about 10%.
  • the fine particles having a particle diameter of 2 nm or more and 7 nm or less, the average particle diameter of the particle size distribution, and the normalized dispersion of the particle size distribution are too fine for the optical microscope used in the prior art. Therefore, it cannot be observed and measured, and can be evaluated by the prescribed X-ray small angle scattering method.
  • the mechanical component according to the embodiment of the present invention described above can achieve both excellent strength and elongation by manufacturing using the aluminum alloy extruded material according to the embodiment of the present invention as a material. .
  • an embodiment of the present invention that is excellent in strength and elongation by performing solution treatment, quenching treatment and artificial aging treatment on the aluminum alloy extruded material according to the embodiment of the present invention under the conditions described later. Can be obtained.
  • Such characteristics of the aluminum alloy extruded material according to the embodiment of the present invention are particularly remarkable by processing the alloy extruded material to simulate a mechanical part under a predetermined condition and performing measurement on the workpiece. Can be expressed. Therefore, in the embodiment of the present invention, an aluminum alloy is processed by imitating a machine part under a predetermined condition with respect to an alloy extruded material, and evaluating the structure and mechanical characteristics of the non-processed part. Extruded material is specified. Below, the concrete process conditions for evaluating an aluminum alloy extruded material concrete are described.
  • the aluminum alloy extruded material according to the embodiment of the present invention is processed into a wire rod extruded material having a circular cross section, and then drawn into a wire rod material, and the wire rod material is subjected to solution treatment and quenching treatment. And after performing an artificial aging treatment, the characteristic can be evaluated by measuring the average dispersion
  • the alloy extruded material according to the embodiment of the present invention is a wire rod extruded material having a circular cross-sectional shape and a diameter of 25 mm, and is drawn and drawn at a reduction rate of 84% to obtain a circular shape having a cross-section of 10 mm ⁇ .
  • the wire rod material is subjected to a solution treatment that is held at a temperature of 480 ° C. for 5 hours, and then subjected to a quenching treatment at an average cooling rate up to 50 ° C. of 200 ° C./second, and then at 120 ° C. for 72 hours Apply artificial aging treatment.
  • the “circular cross section” includes a perfect circle, an ellipse, and a substantially circular shape.
  • the average particle diameter of the fine particles in the crystal grains measured by X-ray small angle scattering is 2 nm. As mentioned above, it is 7 nm or less, the normalized dispersion of the particle size distribution is 45% or less, the tensile strength is 800 MPa or more, and the total elongation is 5% or more. Since the alloy extruded material according to the embodiment of the present invention has such characteristics, a mechanical component excellent in both strength and elongation can be obtained by producing a mechanical component using the alloy extruded material as a raw material. Can do.
  • the average particle diameter of the fine particles obtained by processing and measuring in this way and the normalized dispersion of the particle size distribution are strictly controlled within a predetermined range.
  • a machine part is manufactured using the alloy extruded material, a machine part having excellent strength and elongation can be provided.
  • the measurement angle 2 ⁇ is about 0.1 to 10 degrees or less in the case of X-rays having a wavelength of 1.54 mm using a Cu target.
  • the X-ray small angle scattering method by analyzing the scattered X-rays, it is possible to obtain information on the shape, size and distribution of fine particles on the order of nanometers.
  • the X-ray of the aluminum alloy plate measured by the X-ray small angle scattering method was used. Determine the scattering intensity profile.
  • the X-ray scattering intensity profile is obtained, for example, as the X-ray scattering intensity (scattering X-ray scattering intensity) on the vertical axis and the wave vector q (nm ⁇ 1 ) depending on the measurement angle 2 ⁇ and wavelength ⁇ on the horizontal axis. .
  • the average particle diameter of fine particles that are 2 nm or more and 7 nm or less, and the normalized dispersion indicating the spread of the particle size distribution can be obtained from the X-ray scattering intensity profile. That is, by performing fitting by the nonlinear least square method so that the measured X-ray scattering intensity is close to the X-ray scattering intensity calculated from the theoretical expression represented by the function of the particle diameter and size distribution, the particle diameter and A normalized dispersion value can be obtained.
  • X-ray small-angle scattering measurement apparatus As such an X-ray small-angle scattering measurement apparatus, a representative small-angle scattering apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-119906. Then, X-rays are irradiated at a minute angle (small angle), and X-rays scattered from the sample are measured using a detector such as a two-dimensional multi-wire type.
  • the region where the scattered X-rays are generated is a small angle of about 0.1 to 10 degrees or less in the case of X-rays having a wavelength of 1.54 mm.
  • the machine part and the extruded material according to the embodiment of the present invention are made of a 7000 series aluminum alloy, and the component composition only needs to have a normal chemical composition as a 7000 series aluminum alloy.
  • Zn 8.0 to 14.0% by mass Zn, together with Mg, is an element that improves the strength by forming an aging precipitate that is an intermetallic compound of Mg and Zn during an artificial aging treatment described later. If the Zn content is less than 8.0% by mass, the strength as a machine part is insufficient. Therefore, Zn content is 8.0 mass% or more, Preferably it is 9.0 mass% or more. On the other hand, if the Zn content exceeds 14.0% by mass, ingot cracking is likely to occur during casting of the billet for the extruded material, and ingot making becomes difficult. Therefore, Zn content is 14.0 mass% or less, Preferably it is 13.0 mass% or less. In addition, when Zn content is high, SCC sensitivity becomes sharp, but in order to suppress it, it is desirable to add Cu or Ag described later.
  • Mg 2.0 to 4.0% by mass Mg, together with Zn, is an element that improves the strength and elongation as a mechanical component by forming an aging precipitate, which is an intermetallic compound of Mg and Zn, defined in the embodiment of the present invention during the artificial aging treatment described later. is there. If the Mg content is less than 2.0% by mass, the strength is insufficient. Therefore, the Mg content is 2.0% by mass or more, preferably 2.5% by mass or more.
  • Mg content exceeds 4.0% by mass, the extrudability at a low temperature in the non-recrystallization temperature range (temperature range below the recrystallization temperature) of the cast billet for the extruded material is lowered, and the SCC sensitivity is reduced. Become stronger. Therefore, Mg content is 4.0 mass% or less, Preferably it is 3.5 mass% or less.
  • Cu 0.5 to 2.0 mass% Cu has the effect of improving the SCC resistance as a machine part.
  • the Cu content is 0.5% by mass or more, and preferably 0.7% by mass or more.
  • the Cu content is 2.0 mass% or less, Preferably it is 1.8 mass% or less.
  • Mn 0.2 to 1.5% by mass
  • Mn contributes to improving the strength of mechanical parts by forming dispersed particles.
  • the Mn content is 0.2% by mass or more, preferably 0.3% by mass or more.
  • the Mn content is 1.5% by mass or less, preferably 1.2% by mass or less.
  • Zr 0.05 to 0.3% by mass
  • Zr forms fine precipitates, suppresses recrystallization, and contributes to improving the strength of machine parts.
  • the content of Zr is less than 0.05% by mass, the content is insufficient and the strength is lowered. Therefore, the Zr content is 0.05% by mass or more, preferably 0.1% by mass or more.
  • the Zr content is 0.3% by mass or less, preferably 0.25% by mass or less.
  • the balance is Al and inevitable impurities.
  • trace elements such as Fe, Si, Ti and B brought in depending on the conditions of raw materials, materials, manufacturing facilities, and the like are mixed.
  • the inclusion of each of these inevitable impurities is allowed within the range specified by JIS standards for 7000 series alloys.
  • Fe and Si are each in the range of 0.5% by mass or less (including 0% by mass)
  • Ti is in the range of 0.1% by mass or less (including 0% by mass)
  • B is 0.1% by mass. Each may be contained within the following range (including 0% by mass).
  • the mechanical component and the extruded material according to the embodiment of the present invention are not limited to the above-described composition. As long as the characteristics of the machine part and the extruded material according to the embodiment of the present invention can be maintained, other elements may be further included as necessary. Other elements that can be selectively contained as described above are exemplified below.
  • the Cr content is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more.
  • the Sc content is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more.
  • the Cr content is preferably 0.3% by mass or less, and more preferably 0.25% by mass or less.
  • the Sc content is preferably 0.3% by mass or less, and more preferably 0.25% by mass or less.
  • One or two of Ag: 0.05 to 0.5 mass% and Sn: 0.01 to 0.2 mass% Ag and Sn are non-precipitated in the vicinity of the grain boundary in the artificial aging treatment Suppresses the formation of bands and contributes to improving the strength of machine parts.
  • the Ag content is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more.
  • the Sn content is preferably 0.01% by mass or more, and more preferably 0.03% by mass or more.
  • the Ag content exceeds 0.5% by mass and / or when the Sn content exceeds 0.2% by mass, a coarse primary crystal compound is produced during the casting of the cast billet for the extruded material. It can form and cause seizure during extrusion and / or reduced elongation of the machine part as a product. Therefore, the Ag content is preferably 0.5% by mass or less, and more preferably 0.4% by mass or less. For the same reason, the Sn content is preferably 0.2% by mass or less, and more preferably 0.15% by mass or less.
  • the obtained aluminum alloy billet (ingot) is subjected to homogenization heat treatment (uniform heat treatment) to homogenize the structure (that is, crystal grains in the ingot structure). In order to eliminate segregation in the inside).
  • homogenization heat treatment the Zr-based compound and the compound composed of Mn, Cr and Sc are finely dispersed, and the crystal grain structure after extrusion and solution treatment is refined.
  • the soaking temperature is 400 ° C. or higher, preferably 410 ° C. or higher.
  • the soaking temperature is 450 ° C. or lower, preferably 440 ° C. or lower.
  • the holding time during soaking is preferably about 1 to 8 hours.
  • Hot extrusion By hot extrusion, an extruded material shape close to this final shape corresponding to the final machine part shape is obtained.
  • hot extrusion not only the surface layer portion of the extruded material but also recrystallization inside the extruded material can be suppressed, and a fine extruded structure can be obtained.
  • the extrusion start temperature exceeds 400 ° C.
  • the temperature at the time of extrusion rises and recrystallization tends to occur at a high temperature, and not only a coarse recrystallized structure is formed in the surface layer portion and the inside of the extruded material, but also coarse particles Precipitates, resulting in a decrease in strength.
  • extrusion start temperature is 400 degrees C or less, Preferably it is 380 degrees C or less.
  • the lower the extrusion start temperature the better.
  • the extrusion start temperature is preferably 300 ° C. or higher, more preferably 320 ° C. or higher.
  • the extrusion speed is preferably 10 m / min or less in order to suppress processing heat generated during extrusion and suppress the recrystallization during extrusion. More preferably, it is 7 m / min or less.
  • the average cooling rate up to 50 ° C. is 2 ° C./second or more, and preferably 4 ° C./second or more.
  • Such an average cooling rate of 2 ° C./second or more can be achieved by providing a cooling means.
  • the cooling means include air cooling using a fan and water cooling.
  • direct extrusion or indirect extrusion may be used, but there are cases where many seizures occur under the preferable extrusion conditions in the non-recrystallized region. Therefore, when extrusion is difficult, it is preferable to carry out by hydrostatic extrusion.
  • Direct extrusion and indirect extrusion are more efficient than hydrostatic extrusion, but the recrystallized grain layer on the surface of the extruded material (surface portion) is relatively fine, fibrous crystals extending in the extrusion direction.
  • the recrystallized grain layer on the surface of the extruded material is relatively fine, fibrous crystals extending in the extrusion direction.
  • extrusion below the recrystallization temperature range Processing is quite difficult.
  • the extruded material by hot isostatic pressing includes the recrystallized grain layer, or even if there is a recrystallized grain layer, the structure from the surface layer to the inside can be made uniform. As a result, the drawability, drawability, workability, and formability of the wire rod or wire rod product are significantly improved.
  • the recrystallized grain layer is suppressed as in the embodiment of the present invention, the basic characteristics such as sag resistance required for wire rod products such as aluminum alloy bolts by being a fine extruded structure. Can also be guaranteed.
  • the general processing process for machine parts such as bolts is to draw the extruded material to reduce the diameter after annealing, wash it, anneal it, and then roll or forge it into the product shape of the machine part. Good. And after completion of such product processing, solution treatment and quenching treatment are performed, and further artificial aging treatment is performed to improve the strength.
  • the annealing treatment described above is optional, and the annealing treatment may be performed during drawing or rolling.
  • the cold working such as drawing or rolling is, of course, specific applications such as bolt and nut thread parts, gears (gears), shafts (shafts), bearings (bearings), and springs (springs). Depending on the shape, the conditions are changed.
  • the solution treatment of mechanical parts may be a general heating and cooling method, and is not particularly limited. However, if the holding temperature is less than 450 ° C. or the holding time is less than 0.5 hours, the solid solution of Mg and Zn becomes insufficient and the strength may be insufficient. On the other hand, if the holding temperature exceeds 505 ° C. and the holding time exceeds 10 hours, the strength may be insufficient. Therefore, the solution treatment is preferably held at a solution treatment temperature of 450 to 550 ° C. for 0.5 to 10 hours.
  • the cooling (temperature decrease) rate from the solution treatment temperature to 50 ° C is desirably 50 ° C / second or more on average. If the average cooling rate is too low at less than 50 ° C./second, coarse recrystallization may occur and the strength may be insufficient. In addition, coarse grain boundary precipitates that lower the strength and / or elongation are formed, and the strength may be insufficient.
  • the upper limit of the average cooling rate is about 500 ° C./second from the limit of the equipment capacity.
  • the cooling rate from 50 ° C. to room temperature is not particularly limited, and may be rapidly cooled as it is, or may be cooled by stopping the rapid cooling.
  • the machine part according to the embodiment of the present invention is obtained.
  • the artificial aging treatment temperature is less than 100 ° C., the amount of fine particles formed is insufficient and the strength is lowered. Therefore, the artificial aging treatment temperature is 100 ° C. or higher, preferably 120 ° C. or higher.
  • the artificial aging treatment temperature exceeds 200 ° C., fine particles are coarsened, the particle size distribution is widened, and the strength is lowered. Therefore, the artificial aging treatment temperature is 200 ° C. or lower, preferably 180 ° C. or lower.
  • the artificial aging treatment time is 2 hours or more, preferably 4 hours or more.
  • the artificial aging treatment time exceeds 120 hours, the fine particles become coarse and the strength decreases. Therefore, the artificial aging time is 120 hours or less, preferably 110 hours or less.
  • a person skilled in the art who is in contact with the above-described method for manufacturing a mechanical part and an extruded material according to the embodiment of the present invention will perform a mechanical part according to the embodiment of the present invention by a manufacturing method different from the manufacturing method described above by trial and error. And may be able to obtain extrudates.
  • the wire rod extruded material is subjected to a drawing process with a reduction in area of 84% to simulate a machine part application to obtain a wire rod material having a circular cross section of 10 mm ⁇ .
  • the bar was subjected to a solution treatment at 480 ° C. for 5 hours, then water-cooled at an average cooling rate of up to 50 ° C. at 200 ° C./second, and subjected to artificial aging treatment under the conditions shown in Table 1.
  • the test piece collected from the wire rod material after the artificial aging treatment is a round bar smooth tensile test piece (3 mm ⁇ ⁇ 12 mmGL), and an intermediate (middle) position (1 / D of the diameter D) between the surface of the test piece and the axis center.
  • a surface (cross section) parallel to the extrusion direction at 4 positions) was collected so as to be an observation surface.
  • the X-ray small angle scattering measurement is common to each example, using a horizontal X-ray diffractometer SmartLab manufactured by Rigaku Co., Ltd., and measuring with X-rays having a wavelength of 1.54 mm. The intensity profile was measured.
  • the test apparatus enters X-rays perpendicularly to the surface of the test piece, and emits X-rays scattered backward from the test piece at a minute angle (small angle) of 0.1 to 10 degrees with respect to the incident X-ray. It is measured using a detector.
  • the measurement sample was sliced to about 80 ⁇ m and measured.
  • the X-ray scattering intensity profile is a particle size / hole analysis software manufactured by Rigaku Corporation, NANO-Solver [Ver. 3.5], the average particle diameter and the normalized dispersion are reduced by fitting by the nonlinear least square method so that the measured X-ray scattering intensity and the X-ray scattering intensity calculated by the analysis software are close to each other. Asked.
  • the average particle diameter was obtained by calculating the scattering intensity using a theoretical formula and fitting it with an experimental value, assuming that the particles are perfectly spherical.
  • the normalized dispersion was used to enable comparison of particle distribution spreads regardless of particle diameter.
  • ⁇ is the normalized dispersion
  • n is the number of particles
  • x is the particle diameter
  • ⁇ x> is the arithmetic mean of the particle diameter
  • Comparative Example No. 1 in Table 1 was used.
  • Tables 1 to 5 as shown in Table 1, the aluminum alloy composition is out of the range of the embodiment of the present invention. For this reason, these comparative example No. Nos. 1 to 5 show that extruded materials and simulated machine parts are manufactured by a preferable manufacturing method.
  • the normalized dispersion of the particle size distribution is out of the specified range, or the structure is within the specified range.
  • the tensile strength is as low as less than 800 MPa, or the total elongation is low.
  • Zn deviates from the lower limit.
  • Mg deviates from the lower limit.
  • Comparative Example 3 Mn deviates from the lower limit.
  • Comparative Example 4 Mn deviates from the upper limit.
  • Comparative Example 5 Zr deviates from the lower limit.
  • Comparative Examples 6 to 11 in Table 1 although the aluminum alloy composition is within the range of the embodiment of the present invention as shown in Table 1, the manufacturing conditions simulating the machine parts are out of the above range. As a result, in these comparative examples, the normalized dispersion of the average particle diameter and / or the particle size distribution of the fine particles can be pushed out of the specified range, the tensile strength can be as low as less than 800 MPa, and even the total elongation can be low.
  • Comparative Example 6 is an example where the homogenization temperature is too high. Therefore, the normalized dispersion of the average particle diameter and particle size distribution of the fine particles became excessive, and the tensile strength and the total elongation were reduced.
  • Comparative Example 7 is an example where the extrusion start temperature is too high. Therefore, the normalized dispersion of the particle size distribution increased and the tensile strength decreased.
  • Comparative Example 8 is an example in which the average cooling rate up to 50 ° C. after extrusion is too slow. Therefore, the average particle diameter of the fine particles became excessive, and the tensile strength was reduced.
  • Comparative Example 9 is an example in which the temperature of the artificial aging treatment is too high. Therefore, the normalized dispersion of the average particle diameter and particle size distribution of the fine particles became excessive, and the tensile strength was lowered.
  • Comparative Example 10 is an example in which the time for artificial aging treatment is too long. Therefore, the average particle diameter of the fine particles became excessive, and the tensile strength was reduced.
  • Comparative Example 11 is an example where the homogenization temperature is too low. Therefore, the normalized dispersion of the average particle diameter and particle size distribution of the fine particles became excessive, and the tensile strength and the total elongation were reduced.
  • the mechanical part made of an extruded material of 7000 series aluminum alloy having a tensile strength after artificial aging treatment of 800 MPa or more and a total elongation of 5% or more is obtained, and its manufacture
  • the method can provide a 7000 series aluminum alloy extruded material that is a material thereof.
  • embodiment of this invention can be used suitably as the said mechanical component reduced in weight.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Of Metal (AREA)

Abstract

Cette invention concerne un composant de machine caractérisé en ce qu'il comprend un alliage d'aluminium contenant 8,0 à 14,0 % en masse de Zn, 2,0 à 4,0 % en masse de Mg, 0,5 à 2,0 % en masse de Cu, 0,2 à 1,5 % en masse de Mn et 0,05 à 0,3 % en masse de Zr, le reste étant de l'Al et les inévitables impuretés, le diamètre de particule moyen des particules fines à l'intérieur des grains cristallins mesurés par diffraction des rayons X à petit angle allant de 2 à 7 nm, la dispersion normalisée de la distribution granulométrique n'étant pas supérieure à 45 %, la résistance à la traction étant supérieure ou égale à 800 MPa, et l'allongement total étant supérieur ou égal à 5 %.
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JP7742707B2 (ja) * 2021-02-04 2025-09-22 株式会社Uacj アルミニウム合金材
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61108416A (ja) * 1984-10-30 1986-05-27 Kobe Steel Ltd 高強度Ａｌ−Ｍｇ系合金押出材の製造方法
JPS61259828A (ja) * 1985-05-10 1986-11-18 Showa Alum Corp 高強度アルミニウム合金押出材の製造法
CN101215659A (zh) * 2007-12-27 2008-07-09 北京科技大学 一种高强韧含锰铝合金
WO2014046046A1 (fr) * 2012-09-20 2014-03-27 株式会社神戸製鋼所 Pièce automobile en alliage d'aluminium
JP2014125676A (ja) * 2012-12-27 2014-07-07 Kobe Steel Ltd 強度に優れたアルミニウム合金押出材
WO2017126413A1 (fr) * 2016-01-21 2017-07-27 株式会社神戸製鋼所 Composant mécanique ainsi que procédé de fabrication de celui-ci, et matériau extrudé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61108416A (ja) * 1984-10-30 1986-05-27 Kobe Steel Ltd 高強度Ａｌ−Ｍｇ系合金押出材の製造方法
JPS61259828A (ja) * 1985-05-10 1986-11-18 Showa Alum Corp 高強度アルミニウム合金押出材の製造法
CN101215659A (zh) * 2007-12-27 2008-07-09 北京科技大学 一种高强韧含锰铝合金
WO2014046046A1 (fr) * 2012-09-20 2014-03-27 株式会社神戸製鋼所 Pièce automobile en alliage d'aluminium
JP2014125676A (ja) * 2012-12-27 2014-07-07 Kobe Steel Ltd 強度に優れたアルミニウム合金押出材
WO2017126413A1 (fr) * 2016-01-21 2017-07-27 株式会社神戸製鋼所 Composant mécanique ainsi que procédé de fabrication de celui-ci, et matériau extrudé

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