CN104152745A - Cast highniobium titanium-aluminum alloy and preparation method thereof - Google Patents
Cast highniobium titanium-aluminum alloy and preparation method thereof Download PDFInfo
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- CN104152745A CN104152745A CN201410422029.9A CN201410422029A CN104152745A CN 104152745 A CN104152745 A CN 104152745A CN 201410422029 A CN201410422029 A CN 201410422029A CN 104152745 A CN104152745 A CN 104152745A
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Abstract
The invention discloses a cast highniobium titanium-aluminum alloy and a preparation method thereof. The alloy comprises the following chemical constituents by atomic percentage: Ti: 38-49, Al: 47-49 at%, V: 1.5-3.0 at%, Cr: 0.5-1.5 at%, and Nb: 2-9 at%, and the rest are impurity elements. In the chemical constituents of the alloy, since 2-9 at% high melting point element Nb and 47-49.0 at% Al are added, high niobium and high aluminum titanium-aluminum alloy with high niobium and aluminum contents is produced, the high temperature strength, creep strength and oxidation resistance of the alloy are efficiently improved, and the use temperature of the alloy meets the requirement for use in high temperature environment of 850-900 DEG C. Meanwhile, the high niobium and high aluminum TiAl alloy has good cast performance, is suitable for preparing thin-wall casting and especially suitable for casting light structural members used at a high temperature. The alloy can significantly improve the usability of an engine.
Description
Technical field
The present invention relates to titanium aluminum alloy preparation field, particularly relate to a kind of casting high-niobium TiAl-base alloy and preparation method thereof.
Background technology
Along with the raising of Aeronautics and Astronautics, vehicle, marine engine performance, the more high temperature structural material of high specific strength, high ratio modulus and Geng Gao use temperature of seeking development.γ-TiAl base alloy has low density, higher elasticity modulus and good hot strength, creep resistance and the advantage such as anti-oxidant, is the intermetallic compound structure material that has much application potential.
Ti-(46.0～48.0) Al-(1.5～3.5) V-(0.5～1.5) the Cr casting alloy that Iron and Steel Research Geueral Inst is studied at present, there is excellent room temperature tensile plasticity and intensity combination, wherein, room temperature tensile plasticity is greater than 2.5%, meanwhile, within the scope of 650～750 DEG C, there is good hot strength and creep resistance.But this alloy high-temp intensity and oxidation-resistance still can not meet the service requirements of more than 750 DEG C temperature.
Summary of the invention
Based on the existing problem of above-mentioned prior art, the invention provides a kind of hot strength and antioxidant property and meet casting high-niobium TiAl-base alloy of more than 850 DEG C temperature service requirements and preparation method thereof.
For solving the problems of the technologies described above, the invention provides a kind of casting high-niobium TiAl-base alloy, this alloy comprises by the chemical composition of atomic percent: Ti:38～49at%, Al:47～49at%, V:1.5～3.0at%, Cr:0.5～1.5at%, Nb:2～9at%, all the other are impurity element.
Beneficial effect of the present invention is: in the chemical composition of this alloy, due to the high-melting-point element nb that comprises 2～9at%, and add the Al of 47～49.0at%, all titanium aluminium base alloys of higher high niobium high alumina of content of niobium and aluminium content are formed, effectively improved hot strength, creep strength and the oxidation-resistance of alloy, this alloy use temperature has met 850 DEG C～900 DEG C requirements that hot environment is used.
Simultaneously, this high niobium high alumina TiAl alloy has good castability, be suitable for preparing thin-section casting, especially be applicable to the lightweight construction part of applying under casting high temperature, as aircraft engine low-pressure turbine blade and this class of automobile booster turbine blade are born along the parts of blade length direction load, can significantly improve the use properties of engine, there are wide market outlook.
Embodiment
Below the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
The present invention is to provide a kind of cast titanium aluminum base alloy that keeps higher intensity levels more than 850 DEG C under high temperature, this alloy comprises by the chemical composition of atomic percent: Ti:38～49at%, Al:47～49at%, V:1.5～3.0at%, Cr:0.5～1.5at%, Nb:2～9at%, all the other are impurity element.
This alloy is by γ phase, α
2the gamma-TiAl alloy of phase and a small amount of B2 phase composite, macrostructure's structure of this alloy is columanar structure's structure, columnar crystal structure is of a size of 150～300 μ m; The heterogeneous microstructure of this alloy is for there being orientation lamellar microstructure, and by the axle γ phases such as directed lamellar microstructure and a small amount of intergranular and a small amount of B2 phase composite, lamellar spacing is 0.1～0.6 μ m.
Find according to the research of many twins composite crystals (PST) mechanical property, plus load has good room temperature and high-temperature behavior when parallel with lath border.The parts with this tissue are specially adapted to the parts such as engine blade, mainly bear centrifugal force because of it under arms time, and it is subject to force direction parallel with blade length direction, form synusia orientation and are parallel to surperficial tissue and will be conducive to improve its use properties and reliability.
Further, in the chemical composition of above-mentioned alloy, by atomic percent, also comprise: C:0.1～0.5at% and/or Si:0.1～1at%.
In the chemical composition of above-mentioned alloy, be preferably by atomic percent: Ti:39～47at%, Al:48～49at%, V:1.5～3.0at%, Cr:0.5～1.5at%, Nb:4～8at%, all the other are impurity element.
The chemical composition consumption also comprising is preferably: C:0.1～0.3at% and/or Si:0.2～0.7at%.
This alloy is owing to having macrostructure's structure of specific columanar structure structure and having the heterogeneous microstructure that is orientated lamellar microstructure, by adding high-melting-point element nb, low-alloyed stacking fault energy can effectively fall, improve the critical resolved shear stress of common dislocation, can improve the spread coefficient of alloy alloy, thereby make alloy there is good hot strength and antioxidant property simultaneously.But Nb content is not more high better, in the time that Nb content exceedes 9at%, because β/B2 in alloy significantly increases mutually, alloy mechanical property is unfavorable on the contrary.By making to keep higher Al content in alloy, be conducive to improve Al in alloy oxidation layer
2o
3ratio, be conducive to improve the oxidation-resistance under alloy high-temp.
This alloy is by adding high-melting-point element nb: the high-content Al of 2～9Nbat% and 47～49.0at%, has effectively improved hot strength and the oxidation-resistance of alloy.900 DEG C of tensile strength of this titanium aluminium base alloy have reached 560～644MPa, compared with delivering document, the hot strength that the high niobium of casting of the present invention, high alumina TiAl close is in higher level, especially 900 DEG C of specific tenacitys of alloy of high Al content have exceeded the conventional equiax crystal cast nickel-base alloy K417 alloy of aero engine turbine blades, have reached the level of the non-directional solidified cast superalloy Mar-M247 that current intensity is the highest.
TiAl alloy of the present invention cooperatively interacts by the high niobium high alumina of appropriate level, do not need to introduce a large amount of β and increase mutually high temperature deformation ability, avoid the disadvantageous effect of the relative TiAl alloy strength of a large amount of unordered β under high temperature, its hot strength and antioxidant property meet more than 850 DEG C temperature service requirements, are applicable to the short and lower-cost precision casting forming technology of near-net-shape, technical process.This high niobium high alumina TiAl alloy has extraordinary oxidation-resistance, and this Alloy Anti oxidation experiment carries out according to HB5258-2000, and experiment is carried out in air, and temperature is 900 DEG C, and 100 hours oxidation weight gains are 3～4mg/cm
2level, reaches the anti-oxidant rank of HB5258-2000.
In addition, in alloy of the present invention, add the intermittence such as C, Si element except put forward heavy alloyed hot strength level by precipitation strength mode, also can improve that alloy is lasting, creep mechanical property when isometric.
Below in conjunction with specific embodiment, casting high-niobium TiAl-base alloy of the present invention is described further.
The titanium aluminium base alloy of the embodiment of the present invention all adopts titanium sponge, fine aluminium, pure chromium, high purity graphite, AlV55, AlNb60 alloy as raw material, composition according to embodiment 1 to embodiment 9 is prepared burden, adopt the melting of water jacketed copper crucible vacuum induction shower furnace, after twice remelting, pour into a mould sample.Embodiment 1 to embodiment 9 particular content sees the following form.
The contrast of 900 DEG C of tensile strengths of table 1 alloy embodiment of the present invention and contrast casting alloy
Can find out by above-mentioned data, alloy of the present invention shows excellent hot strength, creep strength and oxidation-resistance, has met 850 DEG C～900 DEG C requirements that hot environment is used, and makes existing alloy use temperature bring up to 900 DEG C from 750 DEG C.Simultaneously, this high niobium, high alumina TiAl alloy have good castability, be suitable for preparing thin-section casting, especially be applicable to the lightweight construction part of applying under casting high temperature, as aircraft engine low-pressure turbine blade and this class of automobile booster turbine blade are born along the parts of blade length direction load, can significantly improve the use properties of engine, there are wide market outlook.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (5)
1. a casting high-niobium TiAl-base alloy, it is characterized in that, this alloy comprises by the chemical composition of atomic percent: Ti:38～49at%, Al:47～49.0at%, V:1.5～3.0at%, Cr:0.5～1.5at%, Nb:2～9at%, all the other are impurity element.
2. casting high-niobium TiAl-base alloy according to claim 1, is characterized in that, described this alloy is by γ phase, α
2the gamma-TiAl alloy of phase and a small amount of B2 phase composite, macrostructure's structure of this alloy is columanar structure's structure, described columnar crystal structure is of a size of 150～300 μ m; The heterogeneous microstructure of this alloy is by the axle γ phases such as directed lamellar microstructure and a small amount of intergranular and a small amount of B2 phase composite, and lamellar spacing is 0.1～0.6 μ m.
3. casting high-niobium TiAl-base alloy according to claim 1 and 2, is characterized in that, in the chemical composition of described alloy, also comprises by atomic percent: C:0.1～0.5at% and/or Si:0.1～1at%.
4. casting high-niobium TiAl-base alloy according to claim 1, it is characterized in that, described alloy comprises by the chemical composition of atomic percent: Ti:39～47at%, Al:48～49at%, V:1.5～3.0at%, Cr:0.5～1.5at%, Nb:4～8at%, all the other are impurity element.
5. according to the casting high-niobium TiAl-base alloy described in claim 1,2 or 4, it is characterized in that, in the chemical composition of described alloy, also comprise by atomic percent: C:0.1～0.3at% and/or Si:0.2～0.7at%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878452A (en) * | 2015-05-13 | 2015-09-02 | 南京理工大学 | High-temperature high-strength TiAl-Nb monocrystal and preparation method thereof |
| CN105441715A (en) * | 2015-12-29 | 2016-03-30 | 青岛博泰美联化工技术有限公司 | Automobile charging turbine |
| CN105483440A (en) * | 2015-12-29 | 2016-04-13 | 青岛博泰美联化工技术有限公司 | Environment-friendly type preparation method for automobile engine blade |
| CN105537518A (en) * | 2015-12-30 | 2016-05-04 | 青岛博泰美联化工技术有限公司 | Preparation method of engine component |
| CN105618679A (en) * | 2015-12-30 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Preparation method for automobile charging turbine |
| CN105618676A (en) * | 2015-12-29 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Environment-friendly preparation method for automobile engine shell |
| CN105821470A (en) * | 2016-04-14 | 2016-08-03 | 南京理工大学 | Dual-structure titanium aluminum (TiAl) alloy and preparation method thereof |
| CN112899525A (en) * | 2021-01-18 | 2021-06-04 | 中国航发北京航空材料研究院 | Titanium-based multi-principal-element alloy |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878452A (en) * | 2015-05-13 | 2015-09-02 | 南京理工大学 | High-temperature high-strength TiAl-Nb monocrystal and preparation method thereof |
| CN105441715A (en) * | 2015-12-29 | 2016-03-30 | 青岛博泰美联化工技术有限公司 | Automobile charging turbine |
| CN105483440A (en) * | 2015-12-29 | 2016-04-13 | 青岛博泰美联化工技术有限公司 | Environment-friendly type preparation method for automobile engine blade |
| CN105618676A (en) * | 2015-12-29 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Environment-friendly preparation method for automobile engine shell |
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| CN105537518A (en) * | 2015-12-30 | 2016-05-04 | 青岛博泰美联化工技术有限公司 | Preparation method of engine component |
| CN105618679A (en) * | 2015-12-30 | 2016-06-01 | 青岛博泰美联化工技术有限公司 | Preparation method for automobile charging turbine |
| CN105821470A (en) * | 2016-04-14 | 2016-08-03 | 南京理工大学 | Dual-structure titanium aluminum (TiAl) alloy and preparation method thereof |
| CN112899525A (en) * | 2021-01-18 | 2021-06-04 | 中国航发北京航空材料研究院 | Titanium-based multi-principal-element alloy |
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