CN103436739A - Rhenium-containing high-strength heat-corrosion-resistant nickel-base single-crystal high-temperature alloy - Google Patents
Rhenium-containing high-strength heat-corrosion-resistant nickel-base single-crystal high-temperature alloy Download PDFInfo
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Abstract
The invention provides a rhenium-containing high-strength heat-corrosion-resistant nickel-base single-crystal high-temperature alloy which comprises the following constituents in percentage by mass: 8.0-12.0% of Cr, 8.0-12.0% of Co, 0.5-3.0% of Mo, 3.0-6.0% of W, 4.0-8.0% of Ta, 3.0-5.0% of Al, 3.0-5.0% of Ti, 1.0-3.0% of Re, 0-0.4% of C and the balance of Ni, wherein the total mass percentage of Al and Ti is greater than or equal to 6.5% and less than or equal to 9%, and a ratio of Al to Ti is less than or equal to 1. The alloy has excellent heat corrosion resistance, has a higher high-temperature mechanical property, has good structure stability, is applicable to high-temperature components of ground and navigational gas turbines, and is also applicable to high-temperature components of airspace and aviation engines.
Description
Technical field
The invention belongs to the nickel-base high-temperature single crystal alloy technical field, be specifically related to mainly to be applicable to bear a kind of high-strength nickel-base high-temperature single crystal alloy of the component of higher stress under the High Temperature Hot-corrosion Behaviorof condition.
Background technology
Carrier-borne aircraft under ocean environment, the development of the sciemtifec and technical spheres such as ground gas turbine, require engine material with good mechanical property and excellent corrosion and heat resistant ability.Along with the raising of engine and burning machine inlet temperature, not only require alloy to keep excellent hot corrosion resistance, its mechanical property is had higher requirement simultaneously.The corrosion and heat resistant nickel-base high-temperature single crystal alloy of China's development at present mainly contains DD8, DD10 and DD413 etc., and these alloys have hot corrosion resistance preferably, but intensity does not far reach the level of domestic and international the second generation single crystal superalloy.Therefore, there is at present high-intensity corrosion and heat resistant single crystal alloy kind at home less.
For above-mentioned background, people expect to obtain a kind of corrosion and heat resistant nickel-base high-temperature single crystal alloy, when thering is good hot corrosion resistance, the mechanical property high strength s-generation corrosion and heat resistant single crystal super alloy suitable with the high-strength single crystal alloy of the typical s-generation such as lasting.
Summary of the invention
The purpose of this invention is to provide the high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of a kind of rhenium-containing, this alloy, in acquisition and the suitable mechanical property of the high-strength single crystal super alloy of the typical s-generation, has good hot corrosion resistance.
The invention provides the high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of a kind of rhenium-containing, the moiety of described alloy forms and the quality percentage composition of each composition meets following requirement:
Cr:8.0～12.0%, Co:8.0～12.0%, Mo:0.5～3.0%, W:3.0～6.0%, Ta:4.0～8.0%, Al:3.0～5.0%, Ti:3.0～5.0%, Re:1.0～3.0%, C:0～0.4%, all the other are Ni, 6.5≤Al+Ti≤9, Al/Ti≤1.
High-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy provided by the invention, the moiety of described alloy forms and the quality percentage composition of each composition meets following requirement:
Cr:9.0～11.0%, Co:9.0～11.0%, Mo:1.0～2.0%, W:3.5～5.5%, Ta:5.0～7.0%, Al:3.3～4.3%, Ti:3.6～4.6%, Re:1.5～2.5%, C:0～0.2%, all the other are Ni, 6.9≤Al+Ti≤8.9, Al/Ti≤1.
High-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy provided by the invention, in described nickel-base high-temperature single crystal alloy, the composition of impurity and quality percentage composition meet following requirement: O≤0.003, N≤0.002, S≤0.004, P≤0.018, Si≤0.2, Pb≤0.0005, Bi≤0.00005.
The chemical composition design of alloy of the present invention (alloy designations is named as DD420) is mainly based on following reason:
Alloying constituent is the key factor that affects thermal etching, by adding alloying element, can promote alloy surface to stablize the formation of oxide film, falls low-alloyed thermal etching speed.In superalloy, Cr improves the most effective alloying element of Alloy Anti hot corrosion resistance, and certain Cr content can form corrosion and heat resistant Cr2O3 protective membrane.But can cause separating out of topological solid matter phase (TCP) during the Cr too high levels in alloy.So in corrosion-resistant superalloy, Cr content is 8.0～12.0%.
Co has restraining effect mutually to TCP, enlarge heat treatment window, but too high Co content can reduce solid solubility temperature, causes the reduction of alloy high-temp performance, and for guaranteeing the high-temperature behavior of alloy, Co content is controlled at 8.0～12.0%.
Mo, W are most important solution strengthening elements in superalloy, but they are all to promote TCP phase forming element, very unfavorable for the structure stability of alloy.And W, Mo very easily generate volatile oxide compound under high-temperature oxidation environment, difficulty or ease form fine and close oxide film, and Na is being arranged
2sO
4environment in, easily cause acid frit reaction, produce the alloy of serious thermal etching, particularly high Mo, catastrophic corrosion often occurs.Therefore, the content of restriction Mo, W is less than respectively 3.0% and 6.0%.
Al, Ti, Ta are topmost precipitation strength γ ' phase forming elements in superalloy.Ti also helps and carries heavy alloyed hot corrosion resistance, and Al can obviously carry heavy alloyed antioxidant property, but liquid towards Na
2sO
4the barrier propterty extreme difference, so the Ti/Al ratio of alloy is greater than 1, and 6.5≤Al+Ti≤9.Ta is except effectively putting forward heavy alloyed heat resistance, can also increase antioxidant property, corrosion resistance nature and the castability of alloy, but Ta is too high, in alloy, eutectic content is high simultaneously, make the thermal treatment of alloy become very difficult, in conjunction with the present invention of these factors, control Ta content 4.0～8.0%.
Re is effective solution strengthening element in superalloy, can reduce the Elements Diffusion speed in high temperature creep, lasting process, significantly improves the mechanical property of alloy.Simultaneously, the hot corrosion resistance of Re alloy is useful.But Re forms volatile oxide compound in oxidising process, the integrity of infringement oxide film, worsen antioxidant property.In addition, excessive Re also can promote that TCP separates out mutually.Therefore, the content of Re is controlled to 1.0～3.0%.
Adding of the addition of C can be put forward heavy alloyed castability, falls the generation small sized particles shape carbide that adds of low-alloyed recrystallize tendency, particularly C and can strengthen crystal boundary, thereby improve the low angle boundary tolerance limit of single crystal alloy, and then put forward heavy alloyed yield rate.But the performance that adds membership reduction alloy of excessive C, therefore, be controlled at 0-0.4% by C content.
Nickel-base high-temperature single crystal alloy of the present invention utilizes element meltings in vacuum induction furnace such as pure Ni, Co, Cr, W, Mo, Ta, Ti, Al, Re, C, and pour into the satisfactory mother alloy of chemical composition, and then by apparatus for directional solidification (high speed freezing method or liquid metal method of cooling) remelting, utilize spiral crystal selector or young brilliant legal to being frozen into the monocrystalline coupon.Before use, need through Overheating Treatment.
For the prior art background, the present invention has developed the high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of a kind of rhenium-containing, and its hot corrosion resistance and M38 alloy phase are worked as, and mechanical property has met or exceeded the high-strength single crystal super alloy level of the typical s-generation.
Advantage of the present invention and beneficial effect are described as follows:
(1) with existing other nickel-base high-temperature single crystal alloy, compare, alloy of the present invention has excellent hot corrosion resistance, and 900 ℃ of thermal etching abilities are suitable with M38.
(2) enduring quality of alloy of the present invention and typical the second generation single crystal superalloy are quite even more excellent, 982 ℃/248MPa lower creep rupture life > 200h, 1000 ℃/235MPa lower creep rupture life > 100h is high-strength corrosion and heat resistant single crystal super alloy.
(3) alloy of the present invention is stable at 900 ℃ of Long-term Aging tissues.
The accompanying drawing explanation
The Larson-Miller curve comparison diagram that Fig. 1 is first-generation single crystal super alloy PWA1483 and the second generation single crystal superalloy Re ń e N5 in alloy of the present invention and prior art;
The test that Fig. 2 is 900 ° of C hot corrosion resistances of alloy of the present invention;
Fig. 3 is microstructure after 900 ° of C Long-term Aging 2000h of alloy of the present invention.
Embodiment
Following examples will be further described the present invention, but not thereby limiting the invention.
Concrete preparation method requires: adopts vacuum induction melting, first pours into the satisfactory mother alloy of chemical composition, and then prepare the monocrystalline coupon, and must be through Overheating Treatment before use.
Embodiment 1-3:
The chemical composition of nickel-base high-temperature single crystal alloy sample of the present invention is all referring to table 1.For convenient contrast,
Also listed the chemical composition of typical first-generation nickel-base high-temperature single crystal alloy PWA1483 and typical the second generation single crystal superalloy Re ń e N5 in table 1.
The chemical composition of table 1 alloy of the present invention (embodiment 1-8) and PWA1483, Re ń e N5 forms list (wt.%)
| Alloy | Cr | Co | W | Mo | Ta | Al | Ti | Re | C | Ni |
| Embodiment 1 | 9.2 | 9 | 4 | 2 | 5.7 | 3.4 | 4.2 | 2.1 | 0.04 | More than |
| |
10 | 9 | 3.9 | 1.9 | 5.3 | 3.3 | 4 | 2 | 0.02 | More than |
| Embodiment 3 | 10.2 | 9 | 4 | 1.5 | 5 | 3.2 | 4 | 1.9 | 0.03 | More than |
| PWA1483 | 12.0 | 9 | 4 | 1.9 | 5 | 3.4 | 4 | - | 0.06 | More than |
| Reńe?N5 | 7 | 8 | 5.0 | 2 | 7 | 6.2 | - | 3 | - | More than |
Annotate: in table, " remaining " implication on Ni content one hurdle is " surplus ".
Embodiment 4:
The Larson-Miller curve of the embodiment of the present invention 1 alloy and typical first-generation nickel-base high-temperature single crystal alloy PWA1483 and typical the second generation single crystal superalloy Re ń e N5 relatively is shown in Fig. 1.The enduring quality of alloy of the present invention is suitable with Re ń e N5, higher than PWA1483.
Embodiment 5:
900 ° of C hot corrosion resistances of the embodiment of the present invention 2 alloys and hot-corrosion-resistant alloy M38 relatively are shown in Fig. 2.
Embodiment 6:
After the complete thermal treatment of alloy, carry out 900 ° of C Long-term Aging experiments, after Long-term Aging 2000h, do not have TCP to separate out mutually.After the embodiment of the present invention 2 alloy Long-term Agings, tissue is shown in Fig. 3.
Claims (3)
1. the high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of rhenium-containing is characterized in that: the moiety of described alloy forms and the quality percentage composition of each composition meets following requirement:
Cr:8.0～12.0%, Co:8.0～12.0%, Mo:0.5～3.0%, W:3.0～6.0%, Ta:4.0～8.0%, Al:3.0～5.0%, Ti:3.0～5.0%, Re:1.0～3.0%, C:0～0.4%, all the other are Ni, 6.5≤Al+Ti≤9, Al/Ti≤1.
2. according to the high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of rhenium-containing claimed in claim 1, it is characterized in that, the moiety of described alloy forms and the quality percentage composition of each composition meets following requirement:
Cr:9.0～11.0%, Co:9.0～11.0%, Mo:1.0～2.0%, W:3.5～5.5%, Ta:5.0～7.0%, Al:3.3～4.3%, Ti:3.6～4.6%, Re:1.5～2.5%, C:0～0.2%, all the other are Ni, 6.9≤Al+Ti≤8.9, Al/Ti≤1.
3. according to the described high-strength corrosion and heat resistant nickel-base high-temperature single crystal alloy of claim 1 or 2, it is characterized in that: in described nickel-base high-temperature single crystal alloy, the composition of impurity and quality percentage composition meet following requirement: O≤0.003, N≤0.002, S≤0.004, P≤0.018, Si≤0.2, Pb≤0.0005, Bi≤0.00005.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103952595A (en) * | 2014-05-15 | 2014-07-30 | 中国人民解放军第五七一九工厂 | Laser-cladding powder for repairing directional solidified nickel-based high-temperature alloy blade |
| CN103966671A (en) * | 2014-03-31 | 2014-08-06 | 中国科学院金属研究所 | High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method |
| CN107960109A (en) * | 2015-04-01 | 2018-04-24 | 牛津大学创新有限公司 | Nickel-base alloy |
| CN108913952A (en) * | 2018-07-27 | 2018-11-30 | 南京工程学院 | A kind of high temperature alloy and preparation method thereof |
| CN109136654A (en) * | 2017-06-19 | 2019-01-04 | 中国科学院金属研究所 | A kind of low rhenium corrosion and heat resistant long-life high intensity second generation nickel-base high-temperature single crystal alloy and its heat treatment process |
| CN109371288A (en) * | 2018-09-30 | 2019-02-22 | 东方电气集团东方汽轮机有限公司 | The nickel-base high-temperature single crystal alloy and its manufacturing method of low rhenium, high-intensitive corrosion and heat resistant |
| JP2019513185A (en) * | 2016-03-10 | 2019-05-23 | ヌオーヴォ・ピニォーネ・テクノロジー・ソチエタ・レスポンサビリタ・リミタータＮｕｏｖｏ Ｐｉｇｎｏｎｅ Ｔｅｃｎｏｌｏｇｉｅ Ｓ．Ｒ．Ｌ． | Gas turbine applications using high oxidation resistant alloys and high oxidation resistant alloys |
| CN112176224A (en) * | 2020-09-08 | 2021-01-05 | 中国科学院金属研究所 | High-strength nickel-based single crystal superalloy with excellent comprehensive performance |
| WO2022233284A1 (en) * | 2021-05-06 | 2022-11-10 | 中国联合重型燃气轮机技术有限公司 | Ni-based superalloy having high thermal corrosion resistance and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103966671A (en) * | 2014-03-31 | 2014-08-06 | 中国科学院金属研究所 | High-strength hot-corrosion-resistant Ni-based single crystal superalloy and preparation method |
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| CN109136654A (en) * | 2017-06-19 | 2019-01-04 | 中国科学院金属研究所 | A kind of low rhenium corrosion and heat resistant long-life high intensity second generation nickel-base high-temperature single crystal alloy and its heat treatment process |
| CN108913952A (en) * | 2018-07-27 | 2018-11-30 | 南京工程学院 | A kind of high temperature alloy and preparation method thereof |
| CN108913952B (en) * | 2018-07-27 | 2020-04-03 | 南京工程学院 | High-temperature alloy and preparation method thereof |
| CN109371288A (en) * | 2018-09-30 | 2019-02-22 | 东方电气集团东方汽轮机有限公司 | The nickel-base high-temperature single crystal alloy and its manufacturing method of low rhenium, high-intensitive corrosion and heat resistant |
| CN112176224A (en) * | 2020-09-08 | 2021-01-05 | 中国科学院金属研究所 | High-strength nickel-based single crystal superalloy with excellent comprehensive performance |
| WO2022233284A1 (en) * | 2021-05-06 | 2022-11-10 | 中国联合重型燃气轮机技术有限公司 | Ni-based superalloy having high thermal corrosion resistance and preparation method therefor |
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