GB2033925A - Nickel based superalloys - Google Patents
Nickel based superalloys Download PDFInfo
- Publication number
- GB2033925A GB2033925A GB7932412A GB7932412A GB2033925A GB 2033925 A GB2033925 A GB 2033925A GB 7932412 A GB7932412 A GB 7932412A GB 7932412 A GB7932412 A GB 7932412A GB 2033925 A GB2033925 A GB 2033925A
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- United Kingdom
- Prior art keywords
- platinum
- metals
- alloy
- yttrium
- scandium
- Prior art date
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- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 20
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 16
- 229910052706 scandium Inorganic materials 0.000 claims abstract description 14
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 150000002739 metals Chemical class 0.000 claims abstract description 11
- 239000010936 titanium Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 239000011651 chromium Substances 0.000 claims abstract description 10
- 239000004411 aluminium Substances 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052776 Thorium Inorganic materials 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 5
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 5
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052762 osmium Inorganic materials 0.000 claims abstract description 4
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 239000010955 niobium Substances 0.000 claims description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- XSKIUFGOTYHDLC-UHFFFAOYSA-N palladium rhodium Chemical compound [Rh].[Pd] XSKIUFGOTYHDLC-UHFFFAOYSA-N 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 45
- 239000000956 alloy Substances 0.000 abstract description 45
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052763 palladium Inorganic materials 0.000 abstract description 3
- 229910052703 rhodium Inorganic materials 0.000 abstract description 3
- 239000010948 rhodium Substances 0.000 abstract description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 abstract description 3
- -1 platinum group metals Chemical class 0.000 abstract description 2
- 229910052715 tantalum Inorganic materials 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
- 238000007792 addition Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 230000004584 weight gain Effects 0.000 description 2
- 235000019786 weight gain Nutrition 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 229910011255 B2O3 Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
This invention relates to nickel based superalloys containing platinum group metals and to uses of such alloys. In particular, superalloys according to the present invention consist apart from impurities, of: (a) 5 to 25 wt % chromium, (b) 2 to 7 wt% aluminium, (c) 0.5 to 5 wt% titanium, (d) at least one of the metals yttrium and scandium present in a total amount of 0.01 to 3 wt%, (e) 3 to 15 wt% in total of one or more of the platinum group metals platinum, palladium, rhodium, iridium, osmium and ruthenium and (f) balance nickel. The alloy may also contain Co, W, Mo, Hf, Mn, Mg, Si, V, Nb, B, C, Ta, Zr, Fe, Re, Th/rare earth metals or oxides.
Description
SPECIFICATION
Platinum group metal-containing alloys
This invention relates to platinum group metalcontaining alloys and to uses of such alloys. In particular, the invention relates to platinum group metal-containing superalloys and to their uses.
The term "superalloy" is applied in the art to complex nickel-and/or cobalt-based alloys with additions of such metals as chromium, tungsten, molybdenum, titanium, aluminium and iron and which exhibit high values of mechanical strength and creep resistance at elevated temperatures and improved oxidation and hot corrosion resistance. In the case of nickel based superalloys, high hot strength is obtained partly by solid solution hardening using such elements as tungsten or molybdenum and partly by precipitation hardening. The precipitates are produced by adding aluminium and titanium to form the intermetallic compound y', based on Ni3(Ti, Al), within the host material.In the case of cobalt based superalloys, stable metal carbides are intentionally formed in some instances for secondary strengthening purposes, solid solution strengthening providing the main source of strength.
The properties of superalloys in general render them eminently suitable for use in corrosive and/or oxidising environments where high strength is required at elevated temperatures. For example, in the glass industry and particularly in the manufacture of glass fibre, for example for roof insulation material, good hot strength is required combined with creep resistance and very high corrosion resistance, the latter because certain elements present in glass, notably boron and sodium, are extremely corrosive at the temperature of molten glass.
Further, superalloys are suitable for use as materials for fabricating components, such as blades, vanes and so on, for use in gas turbine engines.
Such engines for marine use, for example, typically operate on low-grade fuel having a relatively high sulphur concentration; good hot corrosion resistance is therefore required under these circumstances also.
Gas turbines for use in jet aircraft, on the other hand, typically operate on high-grade fuel which requires that the engine component parts are made from material having good high temperature oxidation resistance. Yet a further use of superalloys is in the fuel industry, particularly in coal gasification plants which are of increasing potential importance due to the abundance of coal relative to other fossil fuels in the earth's crust.
There are many variations for coal gasification systems but most of them are based on one of two classical methods which basically seek to add hydrogen to coal to produce pipeline gas containing in excess of 900/o methane. In the first method, coal is reacted with steam to form synthesis gas, hydrogen
and carbon monoxide which are then catalytically
recombined to form methane. The coal/steam reaction is highly endothermic and requires very high temperatures to proceed at practical rates; the apparatus used is also subject to erosion due to the particulate matter entrained in the reaction gas stream. In the second method, coal is subject to destructive hydrogenation to form methane directly.In one example of this method, pulverized and pretreated bituminous coal is reacted at up to about 1000"C at high pressure with hot, raw hydrogen-rich gas containing a substantial amount of steam. The pretreatment step consists of mild surface oxidation to prevent agglomeration during the hydrogasification step.
For these and other applications, superalloys have proved to be indispensable. However, as technology advances, ever more rigorous conditions are encountered and the demands made upon materials are in consequence ever more exacting. It has been found that there is a limit to the uses of superalloys, as the term is currently understood, in that at elevated temperatures, say of the order of 1 ,000 C, their tensile creep strength tends to diminish due to they phase redissolving in they phase. A solution to this problem is proposed in the specification of our British patent No. 1,520,630, in which there are described and claimed superalloys having additions of one or more platinum group metals.The addition of the platinum group metal has the effect of increasing the high temperature strength and creep resistance of the alloy by solid solution hardening and by raising the temperature of dissolution of they' as well as considerably improving the oxidation and hot corrosion resistance thereof which are functions of surface oxide stability and the ability of the alloy to withstand grain boundary penetration.
We have found, however, thatthe teaching of said
British patent specification No. 1,520,630, is only a partial solution in that, although surface oxide stability is provided, the ability of the alloy to restrict grain boundary penetration is not in all cases satisfactory.
Dispersion-strengthened nickel-base alloys have also been proposed in order to improve hightemperature creep strength but, since such alloys do not contain a y' strengthening phase, their lowtemperature tensile creep strength is impaired and, in any case, there is only limited benefit in oxidation or hot corrosion resistance. Dispersion-strengthened superalloys-that is, containing a precipitated y' phase as well as an oxide dispersion-have also been proposed but their benefits have been mainly in increasing the mechanical strength.
It is therefore an object of this invention to increase still furtherthe oxidation and hot corrosion-resistance of superalloys, particularly by increasing the ability of the alloy to withstand grain boundary penetration.
Further objects of the invention are to provide methods for handling molten glass, for example in the manufacture of glass fibre, for operating a gas turbine and for gasification of coal using structural components fabricated from a superalloy having improved oxidation- and hot-corrosion-resistance.
We have surprisingly found that the objects of the invention may be realised by adding either yttrium and/or scandium to a platinum metal group metalcontaining superalloy, particularly of th 3 type described in our British patent No. 1,520,630.
According to a first aspect of the invention, therefore, a superalloy for structural use at elevated temperatures and in highly corrosive and/or axidising environments consists of, apart from impurities:
(a) 5to25wt%chromium, (b) 2 to 7 wt% aluminium,
(c) 0.5 to 5 wt% titanium,
(d) at least one of the metals yttrium and scandium present in a total amount of 0.01 to 3 wt%,
(e) 3 to 15 wt % in total of one or more of the platinum group metals platinum, palladium, rhodium, iridium, osmium and ruthenium and
(f) balance nickel
According to further aspects of the invention, a method of handling molten glass, for example in the manufacture of glass fibre, a method of burning a fuel: air mixture in a gas turbine engine and a method of producing pipeline gas from coal are characterised in that they use apparatus constructed from a superalloy consisting of, apart from impurities:
(a) 5to25wt%chromium, (b) 2 to 7 wt% aluminium,
(c) 0.5 to 5 wt% titanium, (d) at least one of the metals yttrium and scandium present in a total amount of 0.01 to 3 wt%, (e) 3 to 15 wt% of one or more of the platinum group metals platinum, palladium, rhodium, iridium, osmium and ruthenium and
(f) balance nickel.
Superalloys according to the invention may be modified by the addition of one or more of the constituents listed in the following Table in an amount from a trace to the figure, in wt %, stated.
Cobalt 20 Niobium 3
Tungsten 15 Boron 0.15
Molybdenum 12 Carbon 0.5
Hafnium 2 Tantalium 10
Manganese 2 Zirconium 1.5
Magnesium 2 Iron 15
Silicon 2 Rhenium 4
Vanadium 2 Thorium/rare
earth metals
or oxides
therefor 3
The yttrium and/or scandium components of alloys according to the invention may be present at least in part as their oxides.
Superalloys according to the invention may be divided loosely into two groups, known respectively as "alu mina-formers" and "chromia-formers".
Alloys in the former group contain an amount of aluminium towards the upper end of the range quoted and tend, on oxidation, to form an aluminarich scale and alloys in the latter group likewise contain an amount of chromium towards the upper end of the range quoted and tend, on oxidation, to form a chromia-rich scale. As indicated above, however, the distinction between the two groups is not clear-cut.
The following table gives some examples of socalled "alumina-formers" according to the invention, together with a preferred range of constituents.
All figures are in wt% and represent nominal composition, and nickel (not quoted in the table) constitutes the balance.
ALLOY A B C D E RANGE Cr 8.5 8.3 8.0 6.0 9.0 5 -11 Al 5.0 4.0 6.0 6.0 5.5 3.5 - 6 Ti 2.0 2.0 1.0 1.0 4.75 1 - 5 Y 0.4 0.4 1.0 0.5 0.01- 3 Sc 0.5 1.5 0.01- 3 Pt 10.0 4.0 8.0 10.0 12.5 3 -15 Co 9.5 9.4 8.5 10.0 14.0 8 -15 W 3.0 5.0 3.0 0.1 0 - 6 Ta 1.0 1.0 4.0 0 - 5 Nb 0.5 2.0 2.0 0.1 0 - 3 Mo 0.01 6.0 7.5 3.0 0 - 8 C 0.15 0.15 0.25 0.1 0.15 0 - 0.5 B 0.015 0.015 0.025 0.025 0.015 0 - 0.15 Zr 0.05 0.05 0.05 0.10 0.05 0 - 1.0 Hf 0.01 1.5 0.05 0 - 2.0 Si 1.0 0.7 0 - 2.0 Mn 1.5 0 - 2.0 Mg 0.05 0 - 2.0 Fe 0.05 0.05 0.05 1.05 0.05 0 - 1.5 Re 2.0 0 - 4 Th/rare 2.0 0 - 3 earths The following table gives some examples (alloys
F-M) of so-called "chromia-formers" according to the invention, together with a preferred range of constituents.Again, all figures are in wt% and represent nominal composition, and nickel constitutes the balance. Alloys N-P are alloys without platinum and yttrium and/or scandium and are included by way of comparison.
ALLOY F G H I J K L M N O P RANGE Cr 11.5 21.5 14.5 16.0 12.1 12.1 12.1 12.1 12.1 12.1 12.5 10 -25 Al 3.0 1.4 4.25 3.0 3.4 3.4 3.4 3.4 3.4 3.5 3.5 1 -4.5 Ti 4.25 3.7 1.75 3.5 3.6 3.6 3.6 3.6 3.6 4.1 4.1 1.5 - 5.0 Y 0.2 0.5 0.7 0.05 0.1 0.2 0.1 0.01- 3 Sc 1.0 0.1 0.01- 3 Pt 7.5 10.0 12.5 6.0 4.6 4.6 4.6 4.6 4.6 3 -15 Co 7.5 18.0 9.0 8.0 9.3 9.3 9.3 9.3 9.3 9.0 9.0 0 -20 W 3.6 2.0 12.5 3.0 3.0 3.0 3.0 3.0 4.0 4.0 0 -15 Ta 3.6 1.4 3.5 3.5 3.5 3.5 3.5 3.9 3.9 0 - 5 Nb 0.4 1.0 1.75 1.0 0 -2 Mo 1.8 1.75 1.7 1.7 1.7 1.7 1.7 2.0 2.0 0 - 6 C 0.10 0.15 0.25 0.05 0.1 0.1 0.1 0.1 0.1 0.13 0.13 0 - 0.5 B 0.02 0.01 0.015 0.02 0.014 0.014 0.014 0.014 0.014 0.015 0.015 0 - 0.1 Zr 0.1 0.15 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.11 0.11 0 - 1.0 Hf 0.8 1.0 0.75 0.75 0.75 0.75 0.75 0.88 0.88 0 - 1.5 Si 1.0 0 - 2.0 Mn 1.5 0.01 0 - 2.0 Mg 0.5 0 2.0 Fe 0.05 1.0 0.05 7.5 0 -15 Re 2.5 0 - 4.0 Th/rare 2.0 0 - 3.0 earths Alloys according to the invention may be prepared by standard techniques such as vacuum melting and casting of the metallic components.
We have found that platinum group metal, when added to superalloys, tends to partition preferably to the y' in the proportion of at least 2:1. Its presence in they' phase raises the temperature of dissolution of the said phase in the y host material thus contributing directly to improved mechanical properties to rather highertemperatures than have been achieved hitherto with conventional superalloys. We believe that the presence of yttrium and/or scandium in alloys according to the present invention influences the partition of the platinum group metal and forms a further phase consisting predominantly of yttrium/scandium, nickel and platinum group metal, thus lowering the concentration of platinum group metal throughout the remainder of the alloy.The lower concentration is nevertheless sufficient to impart the normal benefits to the remainder of the alloy, while the yttrium/scandium and platinum group metal phase tends to provide added protection against oxidation and hot corrosion conditions by virtue of being present along the grain boundaries.
The following test results have been obtained for selected alloys according to the invention.
(i) Cyclic oxidation (Table 1 and Figure 1).
Each cycle consisted of placing a sample of the test alloy in a furnace at a temperature of 980"C for 40 minutes and thereafter removing the sample into room temperature for 20 minutes. A good result would be expected to show a slight weight gain due to surface oxidation; a significant weight gain is due to internal oxidation and weight loss is due to spallation, both of which are unacceptable. The results show that oxidation resistance is improved for alloys containing yttrium and platinum and slightly impaired for the alloy (M) containing scandium and platinum compared with the alloy (P) containing yttrium but no platinum. Alloy L (0.2% Y) shows particularly good results.
TABLE 1
NO. OF SPECIFIC ALLOY CYCLES WEIGHT CHANGE mg cm-2 K 0 0 186 ;1.13 218 +1.24 332 +0.92 L O 0 186 +1.31 218 +0.84 332 +1.21 385 +1.20 M 0 0 186 + 1.77 218 11.80 332 +2.47 385 +1.80 P O 0 186 c1.70 218 c1.80 332 e2.05 385 +1.70 (ii) Crucible sulphidation (i.e., hot corrosion) (Table 2 and Figures 2-4).
This test was carried out by immersing samples for 90 hours in a mixture of sodium sulphate and sodium chloride in a ratio by weight of 90:10 at a temperature of 825"C.
TABLE2
SPECIFIC ALLOY WEIGHT CHANGE mg cm-2 J -0.45 K -0.54 L +0.44 M -0.82 P +71.32 N -0.47 0 +101.1 The results demonstrate that the addition of yttrium (alloy P) to an alloy containing no platinum (alloy 0) results in a moderate increase in sulphidation (i.e., hot corrosion) resistance and that additions of platinum and yttrium (alloys J, K and L) and platinum and scandium (alloy M) result in outstanding increases in sulphidation resistance. The benefit of platinum and yttrium additions over platinum alone (alloy N) is not apparentfrom these results, but is nevertheless shown clearly by Figures 2-4 which are photomicrographs ( 500) of crosssections of alloys L, M and N afterthe immersion sulphidation test. In Figure 2 (alloy N), the surface corrosion scale is seen to be invading the mass of the alloy in a direction generaily normal to the surface, thereby providing sites for grain boundary penetration leading to ultimate catastrophic failure.
Figure 3 (alloy L; Pt +Y additions) demonstrates the beneficial result of adding yttrium to a platinum-containing alloy in that the scale forms a non-invasive discrete layer which shows no evidence of grain boundary penetration and as such is protecting the mass of the alloy from further attack. Figure 4 (alloy
M; Pt + Sc additions) issimilarto Figure 3 butthe boundary between scale and massive alloy is not quite so even; conceivably grain boundary attack would eventually ensue.
(iii) Resistance to corrosive atmospheric oxidation/corrosive liquid
This test was carried out by suspending a flat sample of test alloy (alloy A) on one side to an atmosphere of air and boric oxide and on the other side to air at a temperature of 1050"C for 50 hours.
The resulting weight change due to the formation of an external oxide film was +0.031% and the film was very thin and adherent with no evidence of pitting. The corresponding alloy without yttrium (not listed in the specification) suffered, in a similar test at 1100 C over 24 hours, a weight loss of 0.04-0.05% and the oxide film was less adherent and sustained minor damage. In a further test, a crucible made from alloy A was filled with molten glass and held at 1100 C for 100 hours. There was no evidence of attack, either on the inside or the outside of the crucible.
Claims (6)
1. A superalloy consisting, apart from impurities, of:
(a) 5 to 25 wt% chromium,
(b) 2to7wt%aluminium, (c) 0.5 to 5 wt% titanium, (d) at least one of the metals yttrium and scandium present in a total amount of 0.01 to 3 wt%, (e) 3 to 15 wt% in total of one or more of the platinum group metals platinum, palladium rhodium, iridium, osmium and ruthenium and
(f) balance nickel
2. A superalloy according to claim 1 including one or more of the constituents listed below and present in an amount from a trace to the figure stated in wt%:
Cobalt 20 Niobium
3
Tungsten 15 Boron 0.15
Molybdenum 12 Carbon 0.5
Hafnium 2 Tantalium 10
Manganese 2 Zirconium 1.5
Magnesium 2 Iron 15
Silicon 2 Rhenium 4
Vanadium 2 Thorium/rare
earth metals
or oxides
thereof 3
3.A superalloy according to claim 6 or claim 2 consisting, apart from impurities of:
(a) 5 to 25 wt% chromium, (b) 3.5 to 6 wt % aluminium,
(c) 1 to 5 wt%titanium,
(d) at least one of the metals yttrium and scandium in a total amount of 0.01 to 3 wt%, (e) 3 to 15 wt% platinum,
(f) 8 to 15wt%cobalt, and
(g) balance nickel
4. A super alloy according to claim 3 including one or more of the constituents listed below and present in an amount from a trace to the figure stated in wt%: tungsten 6 hafnium 2.0 tantalium
5 silicon 2.0 niobium 3 manganese 2.0 molybdenum 8 magnesium 2.0 carbon 0.5 iron 1.5 boron 0.15 rhenium 4.0 zirconium 1.0 thorium/rare
earth metals
or oxides
thereof 3.0
5. A superalloy according to claim 1 or claim 2 consisting, apart from impurities, of:
(a) 10to25wt%chromium, (b) 1 to 4.5 wtO/o aluminium, (c) 1.5 to 5.0 WtO/o titanium,
(d) at least one of the metals yttrium and scandium in an amount of 0.01 to 3 wt %, (e) 3 to 15 wt% platinum, and
(f) balance nickel.
6. A superalloy according to claim 5 including one or more of the constituents listed below and present in an amount from a trace to the figure stated in wt%: cobalt 20 zirconium 1.0 tungsten 15 hafnium 1.5 tantalium 5 silicon 2.0 niobium 2 manganese 2.0 molybdenum 6 magnesium 2.0 carbon 0.5 iron 1.5 boron 0.1 rhenium 4.0
thorium/rare
earth metals
or oxides
thereof 3.0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7932412A GB2033925B (en) | 1978-09-25 | 1979-09-19 | Nickel based superalloys |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7837978 | 1978-09-25 | ||
| GB7932412A GB2033925B (en) | 1978-09-25 | 1979-09-19 | Nickel based superalloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2033925A true GB2033925A (en) | 1980-05-29 |
| GB2033925B GB2033925B (en) | 1983-07-20 |
Family
ID=26268959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7932412A Expired GB2033925B (en) | 1978-09-25 | 1979-09-19 | Nickel based superalloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2033925B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0065812A3 (en) * | 1981-04-08 | 1983-02-02 | Johnson Matthey Public Limited Company | Nickel alloys containing large amounts of chromium |
| US4447503A (en) * | 1980-05-01 | 1984-05-08 | Howmet Turbine Components Corporation | Superalloy coating composition with high temperature oxidation resistance |
| GB2182053A (en) * | 1985-10-11 | 1987-05-07 | Us Energy | Niclel aluminides and nickel-iron aluminides for use in oxidizing environments |
| GB2194549A (en) * | 1986-09-01 | 1988-03-09 | Us Energy | High-temperature fabricable nickel-iron aluminides |
| GB2194960A (en) * | 1986-03-17 | 1988-03-23 | Stuart L Adelman | Improved superalloy compositions and articles |
| GB2278850A (en) * | 1986-01-02 | 1994-12-14 | United Technologies Corp | Columnar grain superalloy articles |
| EP0663462A1 (en) * | 1994-01-03 | 1995-07-19 | General Electric Company | Nickel base superalloy |
| EP0959143A4 (en) * | 1996-10-28 | 1999-12-01 | ||
| EP1329527A3 (en) * | 2001-12-18 | 2003-10-22 | United Technologies Corporation | High strength hot corrosion and oxidation resistant, directionally solidified nickel base superalloy and articles |
| WO2004109829A1 (en) * | 2003-06-06 | 2004-12-16 | Symyx Technologies, Inc. | Platinum-titanium-tungsten fuel cell catalyst |
| US7422994B2 (en) | 2005-01-05 | 2008-09-09 | Symyx Technologies, Inc. | Platinum-copper-tungsten fuel cell catalyst |
| US7700521B2 (en) | 2003-08-18 | 2010-04-20 | Symyx Solutions, Inc. | Platinum-copper fuel cell catalyst |
| CN112262221A (en) * | 2018-06-04 | 2021-01-22 | 赛峰集团 | Nickel-based superalloy, single crystal blade, and turbine engine |
| CN112575228A (en) * | 2020-11-12 | 2021-03-30 | 中国联合重型燃气轮机技术有限公司 | Creep-resistant long-life nickel-based deformation superalloy and preparation method and application thereof |
| USD1042970S1 (en) * | 2023-02-22 | 2024-09-17 | L'oreal | Lipstick container |
-
1979
- 1979-09-19 GB GB7932412A patent/GB2033925B/en not_active Expired
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447503A (en) * | 1980-05-01 | 1984-05-08 | Howmet Turbine Components Corporation | Superalloy coating composition with high temperature oxidation resistance |
| US4662920A (en) * | 1981-04-08 | 1987-05-05 | Johnson Matthey Public Limited Company | Cast component of nickel alloys containing large amounts of chromium |
| EP0065812A3 (en) * | 1981-04-08 | 1983-02-02 | Johnson Matthey Public Limited Company | Nickel alloys containing large amounts of chromium |
| GB2182053A (en) * | 1985-10-11 | 1987-05-07 | Us Energy | Niclel aluminides and nickel-iron aluminides for use in oxidizing environments |
| GB2182053B (en) * | 1985-10-11 | 1990-04-18 | Us Energy | Nickel aluminides for use in oxidizing environments |
| GB2278850A (en) * | 1986-01-02 | 1994-12-14 | United Technologies Corp | Columnar grain superalloy articles |
| GB2278850B (en) * | 1986-01-02 | 1995-06-28 | United Technologies Corp | Columnar grain superalloy articles |
| GB2194960A (en) * | 1986-03-17 | 1988-03-23 | Stuart L Adelman | Improved superalloy compositions and articles |
| GB2194960B (en) * | 1986-03-17 | 1990-06-20 | Stuart L Adelman | Improved superalloy compositions and articles |
| GB2194549B (en) * | 1986-09-01 | 1990-11-21 | Us Energy | High temperature fabricable nickel-iron aluminides |
| GB2194549A (en) * | 1986-09-01 | 1988-03-09 | Us Energy | High-temperature fabricable nickel-iron aluminides |
| EP0663462A1 (en) * | 1994-01-03 | 1995-07-19 | General Electric Company | Nickel base superalloy |
| EP0959143A4 (en) * | 1996-10-28 | 1999-12-01 | ||
| EP1329527A3 (en) * | 2001-12-18 | 2003-10-22 | United Technologies Corporation | High strength hot corrosion and oxidation resistant, directionally solidified nickel base superalloy and articles |
| WO2004109829A1 (en) * | 2003-06-06 | 2004-12-16 | Symyx Technologies, Inc. | Platinum-titanium-tungsten fuel cell catalyst |
| US7608560B2 (en) | 2003-06-06 | 2009-10-27 | Symyx Technologies, Inc. | Platinum-titanium-tungsten fuel cell catalyst |
| US7700521B2 (en) | 2003-08-18 | 2010-04-20 | Symyx Solutions, Inc. | Platinum-copper fuel cell catalyst |
| US7422994B2 (en) | 2005-01-05 | 2008-09-09 | Symyx Technologies, Inc. | Platinum-copper-tungsten fuel cell catalyst |
| CN112262221A (en) * | 2018-06-04 | 2021-01-22 | 赛峰集团 | Nickel-based superalloy, single crystal blade, and turbine engine |
| US11396686B2 (en) | 2018-06-04 | 2022-07-26 | Safran | Nickel-based superalloy, single-crystal blade and turbomachine |
| CN112575228A (en) * | 2020-11-12 | 2021-03-30 | 中国联合重型燃气轮机技术有限公司 | Creep-resistant long-life nickel-based deformation superalloy and preparation method and application thereof |
| USD1042970S1 (en) * | 2023-02-22 | 2024-09-17 | L'oreal | Lipstick container |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2033925B (en) | 1983-07-20 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |