CN109252026A - A kind of heat treatment method of GT35 steel bonded carbide - Google Patents
A kind of heat treatment method of GT35 steel bonded carbide Download PDFInfo
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- CN109252026A CN109252026A CN201811403244.9A CN201811403244A CN109252026A CN 109252026 A CN109252026 A CN 109252026A CN 201811403244 A CN201811403244 A CN 201811403244A CN 109252026 A CN109252026 A CN 109252026A
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
- C21D1/785—Thermocycling
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Abstract
The invention discloses a kind of GT35 steel bonded carbide heat treatment methods.GT35 steel bonded carbide is using CrMo low-alloy steel as Binder Phase, and the TiC particle that mass fraction is 35% is hard phase composition.The comprehensive heat treatment of austenitizing processing, quenching, isothermal tempering and cold cycling is carried out to forging state alloy using heat-treating methods, obtains the small GT35 hard alloy of tissue stabilization, residual stress.Using the GT35 steel bonded carbide of heat treatment method of the present invention compared with the alloy that conventional treatment method obtains, carbide surface residual stress is reduced, improves the hardness of alloy, is placed at room temperature for half a year change in size less than 0.2 ‰.
Description
Technical field
The present invention relates to a kind of heat treatment process of GT35 steel bonded carbide, belong to composite material heat treatment process technology
Field.
Background technique
GT35 steel bonded carbide has the characteristics that hardness is high, wearability is good, machinability is excellent, has been widely applied
In fields such as space flight and aviation, auto industry and tool and moulds, GT35 steel bonded carbide be using CrMo low-alloy steel as Binder Phase,
The TiC particle that mass fraction is 35 % is hard phase composition.In space flight and aviation application field, GT35 material is for manufacturing inertia system
The important components such as the axis of kinetic pressure air-float bearing of inner gyro motor, thrust plate in guiding systems；The minor change of components may be decreased
The reliability of device, or even influence the operation stability of entire inertia system.In tool and mould application field, the deformation of mold materials
Also the quality that product can be influenced to a certain extent, reduces service precision and the service life of mold.The dimensional stability of GT35 material
It is mainly influenced by two aspects: first is that since material is in preparation and matrix during military service mutually easy generation martensitic traoformation, residual
The changes in microstructure such as remaining austenite decomposition, Carbide Precipitation.During these phase transition, due to respectively comparing the difference of volume
It is different, the dimensional stability of material is affected in terms of microstructure stability；Second is that since material is in preparation, processing and heat treatment
Macroscopic residual stress and microstress can be generated in the process, in long-term storage or during be on active service, it may occur that stress relaxation with release
Clearance is, to reduce the dimensional stability of material.Thus, there are mainly two types of for raising GT35 dimension stability on the way
Diameter: being on the one hand to further increase materials microstructure structural stability；It on the other hand is the residual stress of Reasonable Regulation And Control material.
Therefore, a kind of heat treatment process and method for improving GT35 steel bonded carbide dimensional stability is studied, synthesis changes
Kind material structure stability is GT35 material in practical application extension process to improve the dimensional stability of material
Problem in the urgent need to address.
Summary of the invention
In order to preferably control the microstructure of GT35 steel bonded carbide, its dimensional stability is improved, the present invention provides
A kind of heat treatment process of GT35 steel bonded carbide, stable by heat treatment process of the invention treated alloy structure,
Residual stress is smaller, and it is small to place change in size for a long time.Specific technical solution is as follows.
A kind of heat treatment method of GT35 steel bonded carbide, which comprises the following steps:
1) austenitizing processing, is carried out to the GT35 steel bonded carbide of forging state；
2), to by step 1), treated that GT35 steel bonded carbide is quenched；
3), isothermal tempering processing is carried out to by step 2 treated GT35 steel bonded carbide；
4), cold cycling treatment is carried out to by step 3) treated GT35 steel bonded carbide.
Further, the austenitizing treatment process are as follows: the GT35 steel bonded carbide for forging state is heated to 800 ~
1100 DEG C, keep the temperature 20 ~ 100 min.
Further, the quenching processing technology are as follows: austenitizing treated GT35 steel bonded carbide is subjected to oil
It quenches processing, oil temperature is 20 ~ 40 DEG C, and the mass ratio for quenching sample and hardening media is 1:30 to 1:35, and the cool time is 5 ~ 10
min。
Further, the isothermal tempering treatment process are as follows: quenched GT35 steel bonded carbide is heated to 150 ~
300 DEG C, 0.5 ~ 12 h is kept the temperature, it is air-cooled.
Further, the cold cycling treatment technique are as follows: be cooled to the GT35 steel bonded carbide after tempering-
40 ~ -196 DEG C, 0.5 ~ 4 h is kept the temperature, is then heated to 80 ~ 250 DEG C, keeps the temperature 0.5 ~ 6 h, such cold cycling treatment 2 ~ 12 times.
Further, by above-mentioned steps 4) treated, and GT35 steel bonded carbide places half a year at room temperature,
Product size changes less than 0.2 ‰.
Further, by above-mentioned steps 4) hardness of treated GT35 steel bonded carbide is 970 ~ 1050 HV.
Heat treatment method of the invention is the forged processing of GT35 steel bonded carbide based on the alloy for forging state
Afterwards, existing hole after it is sintered, the tissue defects such as micro-crack can be substantially reduced, hard-phase particles are more uniformly spread, alloy
Consistency, hardness and strength significantly improve.It is more conducive to promoting the strong of alloy after being heat-treated the alloy of forging state
Degree, enhances the dimensional stability of alloy.
Austenitizing processing may make the carbide in the Binder Phase of GT35 steel bonded carbide sufficiently to dissolve into matrix, promote
It is uniform into diffusion of alloy elements, sufficient tissue, which has been carried out, for quenching has prepared；Oil quenching processing can substantially reduce the group of quenching workpiece
Stress is knitted, workpiece deformation and tearing tendency are reduced；Meanwhile the viscosity of hardening media is reduced by improving oil temperature, improve its stream
Dynamic property increases oil quenching processing in the cooling capacity of high temperature section；Isothermal tempering processing can be before guaranteeing steel matrix high rigidity
It puts, reduces or eliminate quenching stress, improve the comprehensive mechanical property of alloy.
Cold cycling treatment is loop stabilization processing, is effective way of alloy structure stability after improving tempering
Diameter is the extension and extension of prior heat treatment process, can significantly improve workpiece under the premise of not reducing workpiece strength and hardness
Toughness.The advantage that alloy structure stability improves after cold cycling treatment is: metastable in alloy after cold cycling
Remained austenite content significantly reduce, the dimensional stability of workpiece can be improved；It, can since martensitic traoformation occurs for retained austenite
Further increase the microhardness of alloy；The wear-resisting of alloy can be improved in the raising of martensite content and the precipitation of tiny carbide
Property.
For the GT35 steel bonded carbide obtained through heat treatment method of the present invention compared with conventional treatment method, alloy surface is residual
Residue stress is reduced to -120 ~ -50 MPa by -250 ~ -200 MPa, and the hardness of alloy is improved by 900 ~ 940 HV to 970 ~ 1050
HV, being placed at room temperature for half a year change in size less than 0.2 ‰ (is 10 with precision-7The length variation of the test equipment measurement exemplar of m)；Its
In, the GT35 steel bonded carbide hardness for forging state is 420 ~ 440 HV.
Specific embodiment
In order to further deepen the understanding of the present invention, describe in detail below with reference to embodiment to the present invention, it is necessary to
It points out, the scope of the present invention is not limited by following example.
Embodiment 1
State GT35 steel bonded carbide will be forged and be heated to 800 DEG C of austenitizing processing for carrying out 100 min；By austenitizing
Treated GT35 steel bonded carbide carries out oil quenching processing, and hardening media is No. 10 machine oil, and oil temperature is 25 DEG C, quenching sample with
The mass ratio of hardening media is 1:30, cool time 5min；Hard alloy after quenching is heated to 150 DEG C, 12 h of heat preservation into
Row tempering；Hard alloy after tempering is cooled to -40 DEG C, keeps the temperature 4 h, is heated to 80 DEG C later, keeps the temperature 6 h,
So circulation 12 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -113
MPa improves the hardness of hard alloy to 981 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 2
State GT35 steel bonded carbide will be forged and be heated to 850 DEG C of austenitizing processing for carrying out 80 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 20 machine oil, and oil temperature is 25 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:30, and the cool time is 8 min；Hard alloy after quenching is heated to 150 DEG C, 8 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -80 DEG C, keeps the temperature 4 h, is heated to 120 DEG C later, keeps the temperature 5 h,
So circulation 10 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -109
MPa improves the hardness of hard alloy to 975 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 3
State GT35 steel bonded carbide will be forged and be heated to 900 DEG C of austenitizing processing for carrying out 60 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 30 machine oil, and oil temperature is 25 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:30, and the cool time is 10 min；Hard alloy after quenching is heated to 200 DEG C, 4 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -100 DEG C, keeps the temperature 3 h, is heated to 150 DEG C later, keeps the temperature 4 h,
So circulation 8 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -93
MPa improves the hardness of hard alloy to 992 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 4
State GT35 steel bonded carbide will be forged and be heated to 950 DEG C of austenitizing processing for carrying out 50 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 20 machine oil, and oil temperature is 30 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:35, and the cool time is 5 min；Hard alloy after quenching is heated to 300 DEG C, 2 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -196 DEG C, keeps the temperature 2 h, is heated to 200 DEG C later, keeps the temperature 3 h,
So circulation 6 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -79
MPa improves the hardness of hard alloy to 1005 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 5
State GT35 steel bonded carbide will be forged and be heated to 950 DEG C of austenitizing processing for carrying out 50 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 10 machine oil, and oil temperature is 30 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:35, and the cool time is 10 min；Hard alloy after quenching is heated to 300 DEG C, 1 h of heat preservation is carried out
Tempering；Hard alloy after tempering is cooled to -196 DEG C, keeps the temperature 2 h, is heated to 250 DEG C later, keeps the temperature 3 h,
So circulation 10 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -70
MPa improves the hardness of hard alloy to 998 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 6
State GT35 steel bonded carbide will be forged and be heated to 1000 DEG C of austenitizing processing for carrying out 30 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 20 machine oil, and oil temperature is 40 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:35, and the cool time is 8 min；Hard alloy after quenching is heated to 250 DEG C, 2 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -196 DEG C, keeps the temperature 2 h, is heated to 150 DEG C later, keeps the temperature 4 h,
So circulation 8 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -68
MPa improves the hardness of hard alloy to 1017 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 7
State GT35 steel bonded carbide will be forged and be heated to 1000 DEG C of austenitizing processing for carrying out 50 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 10 machine oil, and oil temperature is 40 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:35, and the cool time is 5 min；Hard alloy after quenching is heated to 200 DEG C, 4 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -196 DEG C, keeps the temperature 4 h, is heated to 250 DEG C later, heat preservation 6
H, so circulation 10 times, obtain exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled be-
62 MPa improve the hardness of hard alloy to 1024 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
Embodiment 8
State GT35 steel bonded carbide will be forged and be heated to 1100 DEG C of austenitizing processing for carrying out 20 min；At austenitizing
GT35 steel bonded carbide after reason carries out oil quenching processing, and hardening media is No. 10 machine oil, and oil temperature is 40 DEG C, quenches sample and quenches
The mass ratio of fiery medium is 1:35, and the cool time is 5 min；Hard alloy after quenching is heated to 150 DEG C, 12 h of heat preservation are carried out
Tempering；Hard alloy after tempering is cooled to -196 DEG C, keeps the temperature 4 h, is heated to 200 DEG C later, keeps the temperature 6 h,
So circulation 12 times, obtains exemplar.A kind of residual stress for existing carbide surface that the present embodiment is handled is -59
MPa improves the hardness of hard alloy to 1027 HV, and the change in size after being placed at room temperature for half a year is less than 0.2 ‰.
The feature in embodiment and embodiment in the present invention can be combined with each other.The invention is not limited to above-mentioned tools
Body embodiment, the above mentioned embodiment is only schematical, rather than limitation, the ordinary skill people of this field
Member under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, can also make very
It is multi-form, within these are all belonged to the scope of protection of the present invention.
Claims (7)
1. a kind of heat treatment method of GT35 steel bonded carbide, which comprises the following steps:
1) austenitizing processing, is carried out to the GT35 steel bonded carbide of forging state；
2), to by step 1), treated that GT35 steel bonded carbide is quenched；
3), isothermal tempering processing is carried out to by step 2 treated GT35 steel bonded carbide；
4), cold cycling treatment is carried out to by step 3) treated GT35 steel bonded carbide.
2. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that the Ovshinsky
Body treatment process are as follows: the GT35 steel bonded carbide for forging state is heated to 800 ~ 1100 DEG C, keeps the temperature 20 ~ 100 min.
3. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that the quenching
Treatment process are as follows: austenitizing treated GT35 steel bonded carbide is subjected to oil quenching processing, oil temperature is 20 ~ 40 DEG C, quenching
The mass ratio of sample and hardening media is 1:30 to 1:35, and the cool time is 5 ~ 10 min.
4. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that the isothermal
Tempering technique are as follows: quenched GT35 steel bonded carbide is heated to 150 ~ 300 DEG C, keeps the temperature 0.5 ~ 12 h, it is air-cooled.
5. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that described cold and hot
Circulating disposal process are as follows: the GT35 steel bonded carbide after tempering is cooled to -40 ~ -196 DEG C, keeps the temperature 0.5 ~ 4 h, with
After be heated to 80 ~ 250 DEG C, keep the temperature 0.5 ~ 6 h, such cold cycling treatment 2 ~ 12 times.
6. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that by above-mentioned
Treated that GT35 steel bonded carbide is placed half a year at room temperature for step 4), and product size changes less than 0.2 ‰.
7. a kind of heat treatment method of GT35 steel bonded carbide according to claim 1, which is characterized in that by above-mentioned
The hardness of step 4) treated GT35 steel bonded carbide is 970 ~ 1050 HV.
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| CN201811403244.9A CN109252026B (en) | 2018-11-23 | 2018-11-23 | Heat treatment method of GT35 steel bonded hard alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756964A (en) * | 2019-12-04 | 2020-02-07 | 珠海东方重工有限公司 | Reverse deformation treatment process before welding of H-shaped steel structure |
| CN110788299A (en) * | 2019-10-11 | 2020-02-14 | 常熟市电力耐磨合金铸造有限公司 | Integrated embedded type casting impact breaking rotor body and preparation process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220560A (en) * | 2018-01-12 | 2018-06-29 | 哈尔滨工业大学 | A kind of high-temperature bearing steel part improves the cold cycling treatment technique of dimensional stability |
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- 2018-11-23 CN CN201811403244.9A patent/CN109252026B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220560A (en) * | 2018-01-12 | 2018-06-29 | 哈尔滨工业大学 | A kind of high-temperature bearing steel part improves the cold cycling treatment technique of dimensional stability |
Non-Patent Citations (1)
| Title |
|---|
| 刘舜尧: "GT35钢结硬质合金应用技术研究", 《稀有金属与硬质合金》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110788299A (en) * | 2019-10-11 | 2020-02-14 | 常熟市电力耐磨合金铸造有限公司 | Integrated embedded type casting impact breaking rotor body and preparation process thereof |
| CN110788299B (en) * | 2019-10-11 | 2021-07-16 | 常熟市电力耐磨合金铸造有限公司 | Integrated embedded type casting impact breaking rotor body and preparation process thereof |
| CN110756964A (en) * | 2019-12-04 | 2020-02-07 | 珠海东方重工有限公司 | Reverse deformation treatment process before welding of H-shaped steel structure |
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