CN107460419A - A kind of tissue and performance optimization new technology of low rhenium single crystal casting - Google Patents
A kind of tissue and performance optimization new technology of low rhenium single crystal casting Download PDFInfo
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- CN107460419A CN107460419A CN201710523008.XA CN201710523008A CN107460419A CN 107460419 A CN107460419 A CN 107460419A CN 201710523008 A CN201710523008 A CN 201710523008A CN 107460419 A CN107460419 A CN 107460419A
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- 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
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- 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
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
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Abstract
The invention belongs to nickel base superalloy field, the tissue and performance for being related to a kind of low rhenium nickel base single crystal alloy optimize new technology.The present invention uses the laboratory facilities of Computer Simulation Software combination differential thermal analysis, and system of heat treatment process is determined more accurately；Simultaneously, the present invention is combined using hot isostatic pressing technique with heat treatment technics, while the casting flaw such as the microporosity in effectively eliminating single crystal casting and shrinkage cavity, cast(ing) surface existing for existing method is avoided by mutual supplement with each other's advantages and recrystallizes problem, improves the intensity and enduring quality of single crystal casting；In addition, the present invention avoids the cast-internal that prior heat treatment process easily causes by staged temperature-rising method and incipient melting phenomenon occurs and by Ageing Treatment three times, greater number of γ ' hardening constituents are obtained relative to traditional Ageing Treatment to separate out, and hardening constituent is evenly distributed, size is suitable, shape is regular, antifatigue, the non-deformability of alloy can be further improved.
Description
Technical field
The invention belongs to nickel base superalloy field, tissue and the performance optimization for being related to a kind of low rhenium nickel base single crystal alloy are new
Technique.
Background technology
Nickel-base high-temperature single crystal alloy has good creep resistant and anti-fatigue performance, good anti-oxidant and corrosion resistance
Energy, it is widely used in the hot-end component of aero-engine and industry gas turbine.With space technology and gas turbine skill
The development of art, high temperature alloy operating temperature also accordingly improve, and therefore, the refractory element content in alloy constantly improves,
In three generations's nickel base superalloy, the total content of the intensified element such as Re, Mo, W, Ta alreadys exceed 20wt%, and wherein element Re has
Important effect, therefore closed using Re contents 0%, 3%, 6% as the first generation, the second generation and third generation nickel-based monocrystal high temperature is distinguished
The standard of gold.Substantial amounts of refractory element, which adds, causes alloy microstructure to deviate poised state in directional solidification process, occurs
Dendritic segregation, γ ' phase sizes are uneven, and low melting point eutectic mutually separates out, and the as cast condition defect such as microporosity, have a strong impact on alloy
Properties, thus all having to pass through suitable processing using preceding.During high temperature alloy military service, microporosity is to lose
One of main formation of crack occurred is imitated, the microporosity in alloy can be effectively eliminated using hot isostatic pressing technique, is improved microcosmic
Tissue, improve alloy consistency；For third generation high temperature alloy, the refractory element of high content, especially Re elements add
Enter, significantly improve the interdiffusion coefficient of each element, aggravated as cast condition segregation so that interdendritic eutectic structure is easier to occur just
It is molten, reduce heat treatment window, thus take multisection type heat treatment to eliminate low melting point eutectic, improve strengthen phase morphology and
Volume fraction, improve the properties of alloy.
The more universal presence of optimize technique design and research on nickel-base high-temperature single crystal alloy, passes through patent retrieval
It was found that：Chinese patent literature CN104404418A " a kind of heat treatment method of nickel base superalloy " have recorded a kind of heat treatment
Method, although the method can improve the hot-working character of alloy, homogenization heat treatment is not carried out, causes alloy initial
Uneven microstructure, initial melting temperature are relatively low；On the other hand, the method for water quenching cooling easily causes hardening constituent and has little time to separate out, and reduces
The volume fraction of γ ' phases, reduces the mechanical property of alloy at high temperature.
Chinese patent literature CN104746145A describes " Technology for Heating Processing of nickel-base high-temperature single crystal alloy ", this method
The high temperature endurance performance of high temperature alloy can be improved, but third generation high temperature alloy initial melting temperature reaches more than 1350 DEG C, document
Middle temperature parameter setting is too low, can not play good thermal effectiveness；Simultaneously as refractory element diffusion velocity is slower, should
Method solution time is too short, element segregation improvement unobvious, and is not heated up using staged, it is easy to causes interdendritic
Low melting point region incipient melting.
Foreign patent documents RU2380454 " hot isostatic pressing processing method of monocrystal nickel-base high-temperature alloy casting ", record
The hip treatment technology of a kind of single crystal super alloy, although this method can also reach the purpose for improving cast properties, so
Without combining homogenization heat treatment, solution treatment, Ageing Treatment, cause obvious segregation, eutectic phase in alloy still be present
The defects of.
The content of the invention
The technical problems to be solved by the invention are, for a kind of low rhenium third generation nickel base superalloy, there is provided Yi Zhongshe
Meter is reasonable, the reliable organization optimization technique of effect, is effectively improved the properties of its single crystal casting.
It is (wt%) for composition：Cr：2.0-4.0%, Co：7.0-10.0%, W：6.0-9.0%, Mo：1.0-2.0%,
Re：3.0-4.5%, Ta：5.0-9.0%, Al：5.0-7.0%, Ti：0-0.5%, Nb：0.2-2.0%, Hf：0.1-0.2%,
Remaining is as follows for the technical scheme of Ni third generation nickel-base high-temperature single crystal alloy organization optimization：
Step 1：Cast(ing) surface cleans；
Step 2：Determine between alloy heat-treatment zone；
Step 3：Prepare single crystal analysis sample；
Step 4：It is determined that manufactured single crystal casting liquidus temperature and solidus temperature；
Step 5：Homogenization heat treatment is carried out to casting；
Step 6：Hip treatment；
Step 7：Solution treatment is carried out to high-temperature alloy casting, is air-cooled to room temperature；
Step 8：Ageing Treatment is carried out to the casting after step 7 is handled, is air-cooled to room temperature；
Step 9：Secondary ageing processing is carried out to the casting after step 8 is handled, is air-cooled to room temperature；
Step 10：Carry out low temperature aging processing.
In the step 1, cast(ing) surface attachment is removed first with high-pressure sand blast machine, casting is washed away using cleaning solution
Surface sand and dust greasy dirt, cleaning fluid are the NaOH solution of 20%-30wt% concentration, 50 DEG C are heated to, then by the casting after cleaning
10-15min in cleaning fluid is immersed in, soaks 5min after taking-up in clear water.
The step 2, phase diagram simulation under the conditions of being balanced using thermodynamic software Jmatpro to the alloying component,
It is 1290 DEG C~1360 DEG C to primarily determine that alloy solid solution heat treatment temperature section.
The step 3, thermal analysis sample is cut in single crystal casting different parts, polishing removes surface oxide layer.
The step 4, sample is put into thermal analyzer, and heating is up to 1500 DEG C, then naturally cools to room temperature,
Obtain the differential thermal analysis curve (DTA) of blade sample, and the endothermic peak analysis to curve determine single crystal casting liquidus temperature and
Solidus temperature.
The step 5 determines that the homogenization heat treating regime of alloy is：Casting is placed under 1310 DEG C of vacuum environments and is incubated
2-4h, to improve segregation, improve alloy initial melting temperature.
The step 6 hip treatment system：Technological parameter temperature range is set first as 1100-1200 DEG C, pressure
Scope is 150-200MPa, duration 2-4h；1250-1310 DEG C is then raised temperature to, pressure limit 200-250MPa, is held
The continuous time is 2-4h, and protective gas is argon gas, and it is 15-30 DEG C/s that speed of furnace cooling is controlled after unloading.
The step 7 solution treatment system is：1320 DEG C of insulation 2-4h are warming up to, 1325 DEG C is then heated to, is incubated 2-
4h, 1330 DEG C are finally warming up to, are incubated 6-12h, are air-cooled to room temperature.
Aging strengthening model system of the step 8：Alloy is incubated 2-4h under 1160-1180 DEG C of vacuum environment,
It is air-cooled to room temperature.
The secondary ageing heat treating regime of the step 9：Alloy is incubated under 850-870 DEG C of vacuum environment 24h with
On, it is air-cooled to room temperature.
The step 10 low temperature aging heat treating regime is：After step 9, be cooled to 750-760 DEG C insulation 24h with
On, it is air-cooled to room temperature.
Compared with prior art, advantages of the present invention and have the beneficial effect that：Relative to traditional simple heat treatment work
Skill, the present invention use the laboratory facilities of Computer Simulation Software combination differential thermal analysis, Technology for Heating Processing system are determined more accurately
Degree；It is micro- thin in single crystal casting is effectively eliminated meanwhile the present invention is combined using hot isostatic pressing technique with heat treatment technics
While the casting flaw such as pine and shrinkage cavity, cast(ing) surface existing for existing method is avoided by mutual supplement with each other's advantages and recrystallizes problem,
Improve the intensity and enduring quality of single crystal casting；In addition, the present invention be directed to the tissue of third generation nickel-base high-temperature single crystal alloy
It is more advanced relative to a traditional generation and two generation Crystal Nickel-based Superalloys with the optimisation technique of performance；In addition, the present invention is logical
Cross staged temperature-rising method and avoid the cast-internal that prior heat treatment process easily causes and incipient melting phenomenon occur and by three times
Ageing Treatment, obtain greater number of γ ' hardening constituents relative to traditional Ageing Treatment and separate out, and it is equal to strengthen distributed mutually
It is even, size is suitable, shape is regular, can further improve antifatigue, the non-deformability of alloy.
Brief description of the drawings
Fig. 1 is inventive energy optimization technological process figure.
The thermodynamical equilibrium phasor of Fig. 2 single crystal alloys, primarily determine that alloy solid solution heat treatment temperature section for 1290 DEG C~
1360℃。
The differential thermal analysis curve (DTA) of Fig. 3 single crystal alloys, the single crystal casting liquidus temperature and solidus temperature of accurate measurement
Degree.
Fig. 4, which is that single crystal casting organization optimization is front and rear, strengthens phase morphology comparison diagram.
Embodiment
According to a specific embodiment, the present invention will be described in further detail below：
The present embodiment is a kind of performance optimization method of low rhenium nickel base single crystal casting, and specific alloying component is (wt%)：Cr：
3%, Co：10%, W：8.5%, Mo：1%, Re：3.5%, Ta：5%, Al：6%, Ti：0.2%, Nb：0.2%, Hf：0.1%,
Remaining is Ni.
Step 1, clear up cast(ing) surface.It is remaining that the formwork of cast(ing) surface is blown away using high-pressure sand blast machine, the corner of casting
Place, groove, position is not easily cleaned at variable cross-section etc., using scrub-brush and sand paper manual cleanup.Prepare 20%-30% concentration
NaOH solution, cleaning fluid is heated to 50 DEG C, injects in tank, the casting after cleaning is then soaked into 15min in cleaning fluid,
5min is soaked after taking-up in clear water to rinse well.
Step 2, primarily determine that between alloy heat-treatment zone.Under the conditions of Thermodynamic Simulation software Jmatpro calculated equilibriums
The foundry alloy thermodynamical equilibrium phasor of given composition, as shown in figure 1, primarily determining that alloy solid solution heat treatment temperature section is 1290
DEG C~1360 DEG C.
Step 3, prepare single crystal analysis sample.Thermal analysis sample is cut in single crystal casting different parts, polishing removes surface
Oxide layer.
Step 4, it is determined that manufactured single crystal casting liquidus temperature and solidus temperature.Sample is put into thermal analyzer,
Heating is up to 1500 DEG C, then naturally cools to room temperature, obtains DTA curve such as Fig. 2 of blade sample.Three are shared on image
Endothermic peak is respectively 1283.6 DEG C, 1345.4 DEG C, 1407.3 DEG C.Dendrite is done with interdendritic γ ' hardening constituents mutually at 1283.6 DEG C
When substantially completely dissolve；(γ '+γ) eutectic structure fusion temperature is 1345.4 DEG C；And γ phases almost all at 1407.3 DEG C
Fusing.Taking the intersection point of top greatest gradient and datum line, i.e. alloy initial melting temperature is 1358.2 DEG C as onset points.Thus
The solidus temperature of the single crystal super alloy is 1358.2 DEG C, and liquidus temperature is 1407.3 DEG C.
Step 5, homogenization heat treatment.The single crystal casting cleared up is placed in vacuum heat treatment furnace and is heated to 1310 DEG C
Room temperature is cooled to the furnace after insulation 3h；
Step 6, hip treatment.The single crystal casting homogenized after being heat-treated is put into hot isostatic press, toward work
Interior is filled with argon gas, and in-furnace temperature then is risen into 1180 DEG C, and pressure rises to 150MPa, keeps 2h；1300 DEG C are then raised temperature to,
Pressure brings up to 225MPa, keeps 2h；Load then is shed, hot isostatic press cooling velocity is set as 20 DEG C/s, is cooled to room
Extract work indoor gas after temperature out, take out casting.
Step 7, single crystal casting is put into vacuum furnace and is warming up to 1320 DEG C, be incubated 3h；Further it is warming up to
1325 DEG C, be incubated 3h after be warming up to 1330 DEG C insulation 8h after, be air-cooled to room temperature.
Step 8, high-temperature aging heat treatment.Single crystal casting is incubated 4h under 1170 DEG C of vacuum environments, is air-cooled to room temperature；
Step 9, secondary ageing heat treatment.Single crystal casting is placed under 860 DEG C of vacuum environments and is incubated 24h, is air-cooled to room
Temperature；
Step 10, low temperature aging.Single crystal casting is incubated 24h at a temperature of 760 DEG C, fire door is then turned on and is air-cooled to room
Temperature, take out casting.
Claims (9)
1. tissue and performance the optimization new technology of a kind of low rhenium single crystal casting, it is characterised in that comprise the following steps that：
Step 1：Cast(ing) surface cleans；
Step 2：Determine between alloy heat-treatment zone；
Step 3：Prepare single crystal analysis sample；
Step 4：It is determined that manufactured single crystal casting liquidus temperature and solidus temperature；
Step 5：Homogenization heat treatment is carried out to casting；
Step 6：Hip treatment；
Step 7：Solution treatment is carried out to high-temperature alloy casting, is air-cooled to room temperature；
Step 8：Ageing Treatment is carried out to the casting after step 7 is handled, is air-cooled to room temperature；
Step 9：Secondary ageing processing is carried out to the casting after step 8 is handled, is air-cooled to room temperature；
Step 10：Carry out low temperature aging processing.
2. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
In step 1, cast(ing) surface attachment is removed first with high-pressure sand blast machine, cast(ing) surface sand and dust greasy dirt is washed away using cleaning solution,
Cleaning fluid is the NaOH solution of 20%-30wt% concentration, is heated to 50 DEG C, then the casting after cleaning is immersed in cleaning fluid
10-15min, 5min is soaked after taking-up in clear water.
3. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 2, phase diagram simulation under the conditions of being balanced using thermodynamic software Jmatpro to the alloying component, primarily determines that alloy
Solution heat treatment temperature section is 1290 DEG C~1360 DEG C.
4. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 3, thermal analysis sample is cut in single crystal casting different parts, polishing removes surface oxide layer.
5. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 4, sample is put into thermal analyzer, heating is up to 1500 DEG C, then naturally cools to room temperature, obtains blade sample
Differential thermal analysis curve (DTA), and single crystal casting liquidus temperature and solidus temperature are determined to the analysis of the endothermic peak of curve.
6. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 5 determines that the homogenization heat treating regime of alloy is：Casting is placed under 1310 DEG C of vacuum environments and is incubated 2-4h, to improve
Segregation, improve alloy initial melting temperature.
7. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 6 hip treatment system：Technological parameter temperature range is set first as 1100-1200 DEG C, pressure limit 150-
200MPa, duration 2-4h；Then raise temperature to 1250-1310 DEG C, pressure limit 200-250MPa, duration 2-
4h, protective gas are argon gas, and it is 15-30 DEG C/s that speed of furnace cooling is controlled after unloading.
8. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Step 7 solution treatment system is：1320 DEG C of insulation 2-4h are warming up to, 1325 DEG C is then heated to, is incubated 2-4h, finally heats up
To 1330 DEG C, 6-12h is incubated, is air-cooled to room temperature.
9. the tissue and performance optimization new technology of a kind of low rhenium single crystal casting as claimed in claim 1, it is characterised in that described
Aging strengthening model system of step 8：Alloy is incubated 2-4h under 1160-1180 DEG C of vacuum environment, is air-cooled to room temperature；
The secondary ageing heat treating regime of the step 9：Alloy is incubated more than 24h under 850-870 DEG C of vacuum environment, is air-cooled to
Room temperature；The low temperature aging heat treating regime of the step 10 is：After step 9, be cooled to 750-760 DEG C insulation 24h with
On, it is air-cooled to room temperature.
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Cited By (8)
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|---|---|---|---|---|
| CN109306399A (en) * | 2018-12-05 | 2019-02-05 | 贵州航天精工制造有限公司 | A kind of heat treatment method improving GH738 bolt class product mechanical performance |
| CN111074332A (en) * | 2019-12-31 | 2020-04-28 | 东莞材料基因高等理工研究院 | Heat treatment method for rapidly eliminating microsegregation in single crystal high-temperature alloy |
| CN112338190A (en) * | 2020-11-30 | 2021-02-09 | 中国航发动力股份有限公司 | Heat treatment process method for high-temperature alloy additive manufactured part |
| WO2021046927A1 (en) * | 2019-09-12 | 2021-03-18 | 南京达迈科技实业有限公司 | Nickel-rhenium alloy rotary tubular target material containing trace rare earth elements and preparation method therefor |
| CN114250519A (en) * | 2022-01-10 | 2022-03-29 | 西北工业大学 | Solid solution heat treatment method for reducing content of solid solution holes of high-rhenium nickel-based single crystal superalloy |
| CN115094360A (en) * | 2022-07-13 | 2022-09-23 | 北航（四川）西部国际创新港科技有限公司 | Heat treatment process of single crystal high temperature alloy with deformation and recrystallization resistant effects |
| CN115261755A (en) * | 2022-08-04 | 2022-11-01 | 西部超导材料科技股份有限公司 | Heat treatment process and application of GH2150A high-temperature alloy |
| CN117512404A (en) * | 2024-01-05 | 2024-02-06 | 中国航发北京航空材料研究院 | Precipitated phase dispersion strengthening hydrogen embrittlement resistant nickel-based single crystal superalloy and preparation method thereof |
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| CN109306399A (en) * | 2018-12-05 | 2019-02-05 | 贵州航天精工制造有限公司 | A kind of heat treatment method improving GH738 bolt class product mechanical performance |
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| CN111074332A (en) * | 2019-12-31 | 2020-04-28 | 东莞材料基因高等理工研究院 | Heat treatment method for rapidly eliminating microsegregation in single crystal high-temperature alloy |
| CN112338190A (en) * | 2020-11-30 | 2021-02-09 | 中国航发动力股份有限公司 | Heat treatment process method for high-temperature alloy additive manufactured part |
| CN114250519A (en) * | 2022-01-10 | 2022-03-29 | 西北工业大学 | Solid solution heat treatment method for reducing content of solid solution holes of high-rhenium nickel-based single crystal superalloy |
| CN115094360A (en) * | 2022-07-13 | 2022-09-23 | 北航（四川）西部国际创新港科技有限公司 | Heat treatment process of single crystal high temperature alloy with deformation and recrystallization resistant effects |
| CN115094360B (en) * | 2022-07-13 | 2022-11-29 | 北航（四川）西部国际创新港科技有限公司 | Heat treatment process of single crystal high temperature alloy with deformation resistance and recrystallization resistance effects |
| CN115261755A (en) * | 2022-08-04 | 2022-11-01 | 西部超导材料科技股份有限公司 | Heat treatment process and application of GH2150A high-temperature alloy |
| CN117512404A (en) * | 2024-01-05 | 2024-02-06 | 中国航发北京航空材料研究院 | Precipitated phase dispersion strengthening hydrogen embrittlement resistant nickel-based single crystal superalloy and preparation method thereof |
| CN117512404B (en) * | 2024-01-05 | 2024-04-02 | 中国航发北京航空材料研究院 | Precipitated phase dispersion strengthening hydrogen embrittlement resistant nickel-based single crystal superalloy and preparation method thereof |
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