CN106756685A - A kind of method for refining nickel-based high-temperature alloy forge piece grain structure - Google Patents
A kind of method for refining nickel-based high-temperature alloy forge piece grain structure Download PDFInfo
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- CN106756685A CN106756685A CN201710002995.9A CN201710002995A CN106756685A CN 106756685 A CN106756685 A CN 106756685A CN 201710002995 A CN201710002995 A CN 201710002995A CN 106756685 A CN106756685 A CN 106756685A
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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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Abstract
The invention discloses a kind of method for refining nickel-based high-temperature alloy forge piece grain structure, it is characterised in that become strain rate technique using the two pass time of moderate soak and promote material that perfect recrystallization occurs, comprise the following steps：(1) nickel base superalloy forging stock is carried out into solid solution pretreatment, is quenched immediately after；(2) forging stock that step 1 is obtained is heated to 970 DEG C~1010 DEG C, insulation to forging stock temperature it is uniform after, strain rate technique is become using the two pass time of moderate soak blank is applied to deform：The strain rate of the first passage forging stock is 0.05s‑1~0.1s‑1, the deflection of the first passage forging stock is 20%~35%, and the strain rate of the second passage forging stock is 0.01s‑1~0.001s‑1, the interval time between two passages is 60s~240s, and the total deformation of the passage of forging stock two is 50%~60%；(3) after deformation terminates, forging is quenched immediately.The present invention can effectively reach the purpose of refinement nickel-based high-temperature alloy forge piece grain structure with less total deformation, be that the quality of nickel-based high-temperature alloy forge piece is risen to there is provided new technology.
Description
Technical field：
The invention belongs to technical field of forging, it is related to a kind of method for refining nickel-based high-temperature alloy forge piece grain structure.
Background technology：
Nickel base superalloy has intensity and plasticity higher, good corrosion-resistant and antioxygenic property, and good
Fatigue behaviour, is one of most widely used alloy material in current aviation field, is widely used in manufacture aeroplane engine
The vital parts such as the machine turbine disk, casing, compressor disc and blade.
Crystal grain thinning tissue is an important goal during forging is manufactured.Why is the heat forming technologies such as forging
Energy crystal grain thinning tissue, because material can occurrence dynamics recrystallization behavior in thermal deformation process.However, for nickel-base high-temperature
Alloy is when single pass and constant operating mode (temperature, strain rate) deform, it is necessary to large strain could occur complete dynamic
Recrystallization, such as GH4169 alloys, in 980 DEG C of deformation temperature and strain rate 0.001s-1, bring it about 95% dynamic again
Equivalent strain needed for crystallization reaches 1.7 (equivalent to deformation extents 82%).Obviously, it is such greatly in actual die forging process
Change is unapproachable.Although increase deformation temperature and reducing strain rate, can reduce needed for dynamic recrystallization occurs completely
Strain, but it can increase dynamic recrystallization crystallite dimension, it will be apparent that have impact on grain refining effect.Therefore, it is badly in need of invention
A kind of new method, the strain needed for nickel base superalloy dynamic recrystallization occurs completely can be effectively reduced using the method,
Its recrystal grain fine microstructures can be caused again.
The content of the invention：
It is an object of the invention to provide a kind of method for refining nickel-based high-temperature alloy forge piece grain structure, it is characterized in that adopting
Becoming strain rate technique with the two pass time of moderate soak promotes alloy that complete recrystallization occurs, and need not increase deformation temperature or
The strain rate in finish-forging stage is reduced, so as to reach with less total deformation refinement nickel-based high-temperature alloy forge piece grain structure
Purpose, solves existing method and is difficult to obtain the nickel that dynamic recrystallization degree is complete, crystal grain is tiny under less strained condition
The problem of based high-temperature alloy forging grain structure.
The scheme that the present invention solves above-mentioned problem is：
Step 1：Nickel base superalloy forging stock is carried out into solid solution pretreatment, is quenched immediately after；The technique of solid solution pretreatment
For：Forging stock is heated to 1010~1040 DEG C of insulations, soaking time is 0.7 hour~0.9 hour；
Step 2：The forging stock that step 1 is obtained is heated to 970 DEG C~1010 DEG C, insulation to forging stock temperature it is uniform after, use
The two pass time of moderate soak becomes strain rate technique and blank is applied to deform；Its concrete technology is：The strain of the first passage forging stock
Speed is 0.05s-1~0.1s-1, the deflection of the first passage forging stock is 20%~35%, the strain rate of the second passage forging stock
It is 0.01s-1~0.001s-1, the interval time between two passages is 60s~240s, the total deformation of the passage of forging stock two for 50%~
60%；
Step 3：After deformation terminates, forging is quenched immediately.
Beneficial effects of the present invention are：It is dynamic and dynamic that the method takes full advantage of deformation-dislocation-two pass time insulation-Asia
The interaction mechanism of state recrystallization, finally realizes and reaches refinement nickel-based high-temperature alloy forge piece with relatively small total deformation
The purpose of grain structure, is that the quality of nickel-based high-temperature alloy forge piece is risen to there is provided new technology.
Brief description of the drawings：
Fig. 1 GH4169 alloys forging stocks are by the tissue after solid solution pretreatment；
Strain rate-the strain curve of Fig. 2 embodiments 1；
Fig. 3 embodiments 1 become the crystalline substance of the GH4169 alloy forged pieces that strain rate technique is obtained using the two pass time of moderate soak
Grain tissue；
The grain structure of the GH4169 alloy forged pieces that the contrast experiment of Fig. 4 embodiments 1 obtains：A () constant strain rate is 0.1s-1；B () constant strain rate is 0.01s-1；C () becomes strain rate 0.1s-1-0.01s-1；
Strain rate-the strain curve of Fig. 5 embodiments 2；
Fig. 6 embodiments 2 become the crystalline substance of the GH4169 alloy forged pieces that strain rate technique is obtained using the two pass time of moderate soak
Grain tissue；
The grain structure of the GH4169 alloy forged pieces that the contrast experiment of Fig. 7 embodiments 2 obtains：A () constant strain rate is 0.1s-1；B () constant strain rate is 0.001s-1；C () becomes strain rate 0.1s-1-0.001s-1。
Specific embodiment：
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The present invention is a kind of method for refining nickel-based high-temperature alloy forge piece grain structure, is selected in all the examples below
Typical nickel base superalloy-GH4169 alloy forged pieces are object, and its chemical composition is as shown in table 1.
The GH4169 alloying components (wt.%) of material therefor in the present example of table 1
Embodiment 1
Step 1：GH4169 alloys forging stock is carried out into solid solution pretreatment, is quenched immediately after；Solid solution pretreatment technique be：
Forging stock is heated to 1040 DEG C of insulations, soaking time is 0.75 hour；After GH4169 alloys forging stock is through the pretreatment of step 1
Tissue can measure its average crystal grain as shown in figure 1, by solution treatment, obtained uniform grain structure by division lines method
Size is about 75 μm.
Step 2：The forging stock that step 1 is obtained is heated to 1010 DEG C, insulation to forging stock temperature it is uniform after, using moderate soak
Two pass time become strain rate technique blank applied to deform：The strain rate of the first passage forging stock is 0.1s-1, the forging of the first passage
The deflection of base is 30% (true strain 0.35), and the strain rate of the second passage forging stock is 0.01s-1, during interval between two passages
Between be 60s, forging stock experience two-stage deformation after total deformation be 60% (true strain 0.92)；The strain rate of embodiment 1 with
The relation of strain is as shown in Figure 2.
Step 3：After deformation terminates, forging stock is quenched immediately.
Metallographic observation is carried out to GH4169 alloy forged pieces, as a result as shown in Figure 3.Comparison diagram 3 and Fig. 1 understand, of the invention
Method can reach promotion GH4169 alloys dynamic recrystallization and the complete, purpose of crystal grain thinning tissue occurs.In order to prove this hair
The superiority of bright method, has carried out contrast experiment, total deformation and this hair of deformation temperature and forging stock selected by contrast experiment
Bright embodiment 1 is identical, and difference is contrast experiment using constant strain rate and the change strain rate mode without insulation is become
Shape.Fig. 4 (a) is shown with constant strain rate 0.1s-1Metallographic structure is obtained when being deformed into total deformation 60% (true strain 0.92)；
Fig. 4 (b) is shown with constant strain rate 0.01s-1Metallographic structure is obtained when being deformed into total deformation 60% (true strain 0.92).Figure
4 (c) is shown first with constant strain rate 0.1s-1Total deformation 30% (true strain 0.35) is deformed into, it is then rapid to reduce strain
Speed is to 0.01s-1, the metallographic structure that recompression is obtained when total deformation 60% (true strain 0.92).From Fig. 4 (a), with
Constant strain rate 0.1s-160% deflection is deformed into, a small amount of dynamic recrystallization crystal grain is only found around original big crystal boundary,
Metal structure is based on original big crystal grain.And in Fig. 4 (b) and (c), also only there occurs the dynamic recrystallization of part, metallographic group
It is woven to mixed crystal, not up to grain refining effect.Therefore, contrast experiment demonstrates method proposed by the present invention has superiority.
Embodiment 2
Step 1：GH4169 alloys forging stock is carried out into solid solution pretreatment, is quenched immediately after；Solid solution pretreatment technique be：
Forging stock is heated to 1040 DEG C of insulations, soaking time is 0.75 hour；After GH4169 alloys forging stock is through the pretreatment of step 1
Tissue can measure its average crystal grain as shown in figure 1, by solution treatment, obtained uniform grain structure by division lines method
Size is about 75 μm.
Step 2：The forging stock that step 1 is obtained is heated to 980 DEG C, insulation to forging stock temperature it is uniform after, using moderate soak
Two pass time become strain rate technique blank applied to deform：The strain rate of the first passage forging stock is 0.1s-1, the forging of the first passage
The deflection of base is 30% (true strain 0.35), and the strain rate of the second passage forging stock is 0.001s-1, during interval between two passages
Between be 120s, forging stock experience two-stage deformation after total deformation be 60% (true strain 0.92)；The strain rate of embodiment 1 with
The relation of strain is as shown in Figure 5.
Step 3：After deformation terminates, forging stock is quenched immediately.
Metallographic observation is carried out to GH4169 alloy forged pieces, as a result as shown in Figure 6.Comparison diagram 6 and Fig. 1 understand, of the invention
Method can reach the purpose for promoting GH4169 alloys dynamic recrystallization that complete refinement GH4169 alloy grain tissues occur.For
The superiority of the inventive method is proved, contrast experiment has been carried out, total change of deformation temperature and forging stock selected by contrast experiment
Shape amount is identical with the embodiment of the present invention 1, and difference is contrast experiment using constant strain rate and without the change strain rate being incubated
Mode is deformed.Fig. 7 (a) is shown with constant strain rate 0.1s-1Obtained when being deformed into total deformation 60% (true strain 0.92)
Obtain metallographic structure；Fig. 7 (b) is shown with constant strain rate 0.001s-1Obtained when being deformed into total deformation 60% (true strain 0.92)
Obtain metallographic structure.Fig. 7 (c) is shown first with constant strain rate 0.1s-1Total deformation 30% (true strain 0.35) is deformed into, then
It is rapid to reduce strain rate to 0.001s-1, the metallographic structure that recompression is obtained when total deformation 60% (true strain 0.92).By
Fig. 7 (a) understands, with constant strain rate 0.1s-160% deflection is deformed into, a small amount of moving only is found around original big crystal boundary
State recrystal grain, metal structure is based on original big crystal grain.In Fig. 7 (b), due to constant strain rate 0.1s-1It is deformed into
60% deflection so that dynamic recrystallization degree is higher, but a small amount of original big crystal grain is still suffered from metallographic structure, dynamic is again
Crystallization degree is not complete enough.Fig. 7 (c) is similar with Fig. 7 (b) results.Therefore, contrast experiment demonstrates method tool proposed by the present invention
There is superiority.
Claims (2)
1. it is a kind of refine nickel-based high-temperature alloy forge piece grain structure new method, it is characterised in that：The method uses moderate soak
Two pass time become strain rate technique and promote nickel base superalloy that complete recrystallization occurs, it comprises the following steps：
Step 1：Nickel base superalloy forging stock is carried out into solid solution pretreatment, is quenched immediately after；
Step 2：The forging stock that step 1 is obtained is heated to 970 DEG C~1010 DEG C, insulation to forging stock temperature it is uniform after, using centre
The two pass time of insulation becomes strain rate technique and blank is applied to deform；Its concrete technology is：The strain rate of the first passage forging stock
It is 0.05s-1~0.1s-1, the deflection of the first passage forging stock is 20%~30%, and the strain rate of the second passage forging stock is
0.01s-1~0.001s-1, the interval time between two passages is 60s~240s, the total deformation of the passage of forging stock two for 50%~
60%；
Step 3：After deformation terminates, forging is quenched immediately.
2. the method for claim 1, it is characterised in that the forging stock solid solution pretreating process described in step 1 is：By forging stock
1010~1040 DEG C of insulations are heated to, soaking time is 0.7 hour~0.9 hour.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107287540A (en) * | 2017-07-05 | 2017-10-24 | 中南大学 | A kind of method by regulating and controlling deformation temperature refinement nickel-base alloy forging grain structure |
| CN107377838A (en) * | 2017-08-04 | 2017-11-24 | 钢铁研究总院 | A kind of nuclear power eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section |
| CN108796407A (en) * | 2018-07-10 | 2018-11-13 | 无锡派克新材料科技股份有限公司 | A kind of GH3128 high temperature alloys crystal grain homogenization method |
| CN109207889A (en) * | 2018-10-18 | 2019-01-15 | 哈尔滨汽轮机厂有限责任公司 | A kind of heat treatment method solving GH4169 alloy mixed crystal abnormal structure |
| CN109457201A (en) * | 2018-11-14 | 2019-03-12 | 中南大学 | A method of refinement nickel-base alloy forging crystal grain simultaneously improves structural homogenity |
| CN111761014A (en) * | 2020-06-10 | 2020-10-13 | 中国航发北京航空材料研究院 | Method for improving structural uniformity of GH4169 disc forging |
| CN113084061A (en) * | 2021-03-31 | 2021-07-09 | 陕西长羽航空装备有限公司 | Nickel-based superalloy GH3536 die forging and forming method thereof |
| CN115261753A (en) * | 2021-04-29 | 2022-11-01 | 中国科学院金属研究所 | Hot working method for producing high-uniformity ultra-fine grain nickel-based high-temperature alloy |
-
2017
- 2017-01-04 CN CN201710002995.9A patent/CN106756685A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107287540A (en) * | 2017-07-05 | 2017-10-24 | 中南大学 | A kind of method by regulating and controlling deformation temperature refinement nickel-base alloy forging grain structure |
| CN107377838A (en) * | 2017-08-04 | 2017-11-24 | 钢铁研究总院 | A kind of nuclear power eliminates the forging method of mixed crystal with SA508Gr.4N steel heavy forging thickness section |
| CN108796407A (en) * | 2018-07-10 | 2018-11-13 | 无锡派克新材料科技股份有限公司 | A kind of GH3128 high temperature alloys crystal grain homogenization method |
| CN109207889A (en) * | 2018-10-18 | 2019-01-15 | 哈尔滨汽轮机厂有限责任公司 | A kind of heat treatment method solving GH4169 alloy mixed crystal abnormal structure |
| CN109457201A (en) * | 2018-11-14 | 2019-03-12 | 中南大学 | A method of refinement nickel-base alloy forging crystal grain simultaneously improves structural homogenity |
| CN111761014A (en) * | 2020-06-10 | 2020-10-13 | 中国航发北京航空材料研究院 | Method for improving structural uniformity of GH4169 disc forging |
| CN113084061A (en) * | 2021-03-31 | 2021-07-09 | 陕西长羽航空装备有限公司 | Nickel-based superalloy GH3536 die forging and forming method thereof |
| CN115261753A (en) * | 2021-04-29 | 2022-11-01 | 中国科学院金属研究所 | Hot working method for producing high-uniformity ultra-fine grain nickel-based high-temperature alloy |
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