CN105088018A - High-strength oxidation-resisting cobalt-based super alloy - Google Patents
High-strength oxidation-resisting cobalt-based super alloy Download PDFInfo
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- CN105088018A CN105088018A CN201510574406.5A CN201510574406A CN105088018A CN 105088018 A CN105088018 A CN 105088018A CN 201510574406 A CN201510574406 A CN 201510574406A CN 105088018 A CN105088018 A CN 105088018A
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Abstract
The invention provides high-strength oxidation-resisting cobalt-based super alloy and belongs to the technical field of super alloy. The alloy comprises, by mass, 0.02%-0.10% of C, 2.5%-6% of Al, 12%-18% of W, 5%-10% of Cr, 25%-45% of Ni, 0.5%-4% of Ti, 0.001%-0.008% of B, less than 0.03% of S, less than 0.03% of P and the balance Co. The heating processing technology of the high-strength oxidation-resisting cobalt-based super alloy includes 1250-1300 DEG C solution treatment and 800-950 DEG C aging treatment. The novel high-strength oxidation-resisting cobalt-based super alloy with a reinforced gamma' phase not only has the advantage of higher high-temperature strength compared with traditional cobalt-based super alloy, but also has a wide hot working window and a narrow solidification range, thereby having a good coagulating property and a hot working character.
Description
Technical field
The invention belongs to technical field of high temperature alloy, particularly relate to high strength, oxidation-resistant cobalt based high-temperature alloy that one utilizes γ ' to strengthen mutually.
Background technology
High-temperature alloy part is the core heat end pieces in gas turbine aircraft, and its temperature that can bear and hot strength level directly determine the performance level of engine.The hot junction material adopted in current aircraft engine is mainly with by Ni
3the Ni based high-temperature alloy that Al type γ ' strengthens mutually and utilize the Co based high-temperature alloy of solution strengthening to be master.Along with motor performance requires constantly to promote, what high-temperature material needs were higher holds warm ability and stronger mechanical behavior under high temperature.For this reason, people improve constantly the constituent contents such as Al, Ti, Nb of nickel-base alloy, to improve the quantity of γ ' strengthening phase.But the raising of alloying level will bring that segregation is serious, hot processing window narrows and cause ni-base wrought superalloy " difficult distortion " problem, namely produce the lower and still difficult turbine disk producing large-size of lumber recovery.The problem of " high strength " nickel base superalloy " difficult distortion " is in the urgent need to address.Meanwhile, cobalt base superalloy is owing to only utilizing solution strengthening and carbide reinforced, and therefore its intensity is always all in the urgent need to further lifting.
Summary of the invention
The object of the present invention is to provide a kind of high strength, oxidation resistant cobalt base superalloy, with the high-strength oxidation-resistant cobalt based high-temperature alloy that nanometer precipitated phase γ ' strengthens mutually, meet the actual service condition of engine thermal end pieces, namely obtain simultaneously and there is excellent hot strength and excellent oxidation-resistance.The cobalt base superalloy that novel γ ' strengthens mutually not only has the advantage higher than traditional cobalt base superalloy hot strength, have wider hot processing window and narrower freezing range, therefore this novel cobalt base superalloy also has good coagulating property and hot workability simultaneously.
Chemical composition of the present invention (quality %): C0.02-0.10, Al2.5-6, W12-18, Cr5-10, Ni25-45, Ti0.5-4, B0.001-0.008, S < 0.03, P < 0.03, surplus is Co.Its thermal treatment process is 1250-1300 DEG C of solution treatment, and 800-950 DEG C of ageing treatment.
Cobalt base superalloy of the present invention utilizes the stable L1 separated out
2the Co of structure
3(Al, W) type γ ' obtains excellent hot strength mutually.Compare traditional Ni base alloy, the New Co base alloy that γ ' strengthens mutually has following features: (1) can have higher γ ' strengthening phase volume fraction in use temperature interval, produces higher strengthening effect; (2) γ ' strengthening phase back dissolving temperature is relatively low, initial melting temperature is higher, makes the hot processing temperature window of alloy larger; (3) incipient melting/fine melt temperature range is narrower, and solidifying segregation tendency is less.
The composition characteristic of the present invention's high-strength oxidation-resistant cobalt based high-temperature alloy considers following factor:
Nickel: Ni ensures that forming austenitic important element coordinates to keep high antioxidant anticorrosive performance with Cr element; The interpolation of Ni element can expand γ+γ ' two-phase region, and stablize γ ' phase, therefore Ni content is more than 25%.
Aluminium: Al is an important strengthening phase forming element in the present invention, and its main and Co and W forms L1
2γ ' the strengthening phase of structure, obtains stable, tiny strengthening phase and produces good strengthening effect.
Tungsten: W is also an important strengthening phase forming element in the present invention, and it and Co and Al form equally distributed Co
3(Al, W) type γ ' strengthening phase, it also can play the effect of certain solution strengthening simultaneously, the final cobalt base superalloy obtaining high strength.Utilize Co
3the hot strength of (Al, W) type γ ' strengthening phase acquisition material is one of feature in alloy designs of the present invention.
Titanium: Ti element can play stable γ ' strengthening phase in the present invention, obtains the effect of greater amt γ ' phase simultaneously, improves the hot strength of material further, and this is also one of feature in organization design of the present invention.
Chromium: Cr is the principal element improving antioxidant anticorrosive performance, and can form the compact oxidation layer of rich Cr under the condition of steam oxidation, protecting materials is not further oxided, and therefore should ensure that Cr content is more than 5%; Cr can form carbide with C element simultaneously, can separate out, play the effect of second-phase strength, also can separate out at crystal boundary, play the effect of pinning crystal boundary, make material obtain good intensity at intracrystalline.In this novel cobalt base superalloy, add Cr element to improve the antioxidant property of material, this is also one of feature of present component design.
Sulphur: S is a kind of detrimental impurity element in superalloy, particularly unfavorable to thermoplasticity, because S segregation crystal boundary, reduces Grain-boundary Junctions and makes a concerted effort, cause creep rupture strength to reduce.Application claims S controls alap content below 0.03%.
Phosphorus: P is a kind of detrimental impurity element in superalloy, can produce certain fragility.P is also the unfavorable impurity element of segregation crystal boundary.Application claims P controls alap content below 0.03%.
Boron: B is the effective micro-advantageous elements of a kind of strengthening crystal boundary.Boron segregation crystal boundary can control crystal boundary M on the one hand
23c
6the pattern of carbide, boron has the effect of strengthening crystal boundary and increases the creep rupture strength of alloy on the other hand.But excessive B can produce too much boride eutectic weakens Grain-boundary Junctions with joint efforts on the contrary.Therefore, adding of B wants appropriate, and in the present invention, the content of B will control within the scope of 0.001-0.008%.
The interpolation of carbon: C on the one hand can stable austenite tissue, and can form Carbide Precipitation on the other hand and strengthen, application claims C controls within the scope of 0.02-0.10%.
The present invention is rational proportion Al, content of element W to be to obtain stable γ ' strengthening phase of separating out, add the quantity that appropriate Ti element improves γ ' strengthening phase further on this basis, add the antioxidant property that Cr element improves material, final acquisition possesses the novel cobalt base superalloy of excellent hot strength and good antioxidant property simultaneously simultaneously.
Accompanying drawing explanation
Fig. 1 is nanometer precipitated phase L1
2the stereoscan photograph of type γ ' phase.
Embodiment
Now the present invention's embodiment is described in detail.Embodiment describes the one of embodiment of the present invention and process, do not have any restriction to scope of the present invention.
According to composition range of the present invention, many groups embodiment is done to the novel cobalt base superalloy of the present invention.In embodiment, the cobalt base superalloy utilizing γ ' to strengthen mutually and traditional cobalt base superalloy Haynes188 are contrasted, show the hot strength that new alloy is good.
Table 1 is the composition (quality %) of embodiment and comparative example (Haynes188)
In Haynes188, Fe content is 1.46%, La content is 0.082%.
Table 2 contrasts for the high-strength oxidation-resistant cobalt based high-temperature alloy of new alloy of the present invention and Haynes188 cobalt base superalloy tensile property
In table 2, the Erichsen test data of new alloy of the present invention show that this new steel grade has excellent hot strength, and this is of the present invention one large advantage.
Alloy of the present invention also has following advantage, and its hot processing window is about 350 DEG C, and along with the change of composition, its hot processing window slightly changes.Alloy phase ratio (hot processing window at about 100 DEG C) Ni-based with tradition, the hot processing window of this novel cobalt base superalloy is obviously wider than nickel base superalloy, and therefore this new alloy has good hot workability, and this is of the present invention one large advantage.
Claims (1)
1. a high strength, oxidation resistant cobalt base superalloy, it is characterized in that, chemical composition quality % is: C0.02-0.10, Al2.5-6, W12-18, Cr5-10, Ni25-45, Ti0.5-4, B0.001-0.008, S < 0.03, P < 0.03, surplus is Co; Its thermal treatment process is 1250-1300 DEG C of solution treatment, and 800-950 DEG C of ageing treatment.
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| CN201510574406.5A CN105088018A (en) | 2015-09-10 | 2015-09-10 | High-strength oxidation-resisting cobalt-based super alloy |
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| CN201510574406.5A CN105088018A (en) | 2015-09-10 | 2015-09-10 | High-strength oxidation-resisting cobalt-based super alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106636762A (en) * | 2016-12-30 | 2017-05-10 | 江苏鑫信润科技有限公司 | High-performance cobalt-based high-temperature alloy brush wire material |
| CN111051548A (en) * | 2017-04-21 | 2020-04-21 | Crs 控股公司 | Precipitation hardenable cobalt-nickel based superalloys and articles made therefrom |
| CN113897517A (en) * | 2020-06-22 | 2022-01-07 | 首尔国立大学校产学协力财团 | Cobalt-based alloy having self-healing property and method for manufacturing same |
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| CN106636762A (en) * | 2016-12-30 | 2017-05-10 | 江苏鑫信润科技有限公司 | High-performance cobalt-based high-temperature alloy brush wire material |
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| CN111051548A (en) * | 2017-04-21 | 2020-04-21 | Crs 控股公司 | Precipitation hardenable cobalt-nickel based superalloys and articles made therefrom |
| CN113897517A (en) * | 2020-06-22 | 2022-01-07 | 首尔国立大学校产学协力财团 | Cobalt-based alloy having self-healing property and method for manufacturing same |
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