CN105821182A - Heat treatment process for improving bearing steel toughness - Google Patents
Heat treatment process for improving bearing steel toughness Download PDFInfo
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- CN105821182A CN105821182A CN201610407243.6A CN201610407243A CN105821182A CN 105821182 A CN105821182 A CN 105821182A CN 201610407243 A CN201610407243 A CN 201610407243A CN 105821182 A CN105821182 A CN 105821182A
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- Prior art keywords
- bearing steel
- temperature
- under conditions
- processes
- toughness
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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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention provides a heat treatment process for improving the bearing steel toughness and aims at solving the problem that retained austenite in existing bearing steel is poor in stability and toughness and has the adverse effect on the performance. The heat treatment process comprises the steps that 1, quenching process is executed: the bearing steel is treated at the temperature of 1000-1150 DEG C for 10-60 min; 2, carbon allocation process is executed: treatment is performed at the temperature of 150-450 DEG C for 0.5-60 minutes; 3, tempering process is executed: treatment is performed at the temperature of 500-600 DEG C for 0.5-2 hours, and 1-3 times of tempering is performed. The problem that the non-stable retained austenite in the bearing steel has the adverse effect on the performance of the steel is solved, the stability of the retained austenite can be improved, the size accuracy of a bearing can be ensured, a part of stable retained austenite can be introduced to the bearing steel to improve the material toughness and further prolong the service life of the bearing. The hardness of the treated bearing is basically consistent to a traditional Q-T process, and the toughness can be improved by 40%-90%.
Description
Technical field
The present invention relates to the Technology for Heating Processing of a kind of bearing steel.
Background technology
Bearing, as a part for equipment, primarily serves the purpose of the frictional force produced when reducing operating between each parts.Pass at present
The bearing steel Technology for Heating Processing of system, for carrying out multiple high temp tempering after quenching, obtain is finally organized as tempered martensite, pole
A small amount of retained austenite and the proeutectoid carbide of Dispersed precipitate.The wherein trend of the oriented martensite transfor mation of retained austenite, this
Process can cause the change of bearing size, causes the reduction of play, causes the dimensional stability of bearing to reduce, it could even be possible to
Timeliness is caused to ftracture.Meanwhile, austenite is as toughness phase, it is possible to coordinate the deformation in crack propagation process, alleviates Crack Tip
The stress of end is concentrated, thus delays or terminate the extension of crackle.Therefore, the existence energy of a certain amount of stable residual austenite
Enough it is effectively improved the fatigue life of bearing.For prior heat treatment process, retained austenite is the existence of a contradiction, it is considered to
To dimensional stability, select to be preferably minimized its content, but cannot be completely eliminated.
The feature of quenching-carbon distribution (Quenching and Partitioning, Q-P) technique is at a constant temperature to quenching state material
Be incubated under degree, thus obtain can the rich carbon retained austenite of at room temperature stable existence, and then obtain strong excellent plasticity
Steel.Quenching-carbon distribution-tempering (Quenching-Partitioning Tempering, Q-P-T) process characteristic is at Q-P
Highlight the invigoration effect of Carbide Precipitation on the basis of technique, further increase the intensity of steel.
Summary of the invention
The invention aims to solve the poor stability of retained austenite in existing bearing steel and performance is had a negative impact,
The problem of poor toughness, and a kind of Technology for Heating Processing improving bearing steel toughness is proposed.
A kind of Technology for Heating Processing improving bearing steel toughness, realizes according to the following steps:
One, quenching process: bearing steel processes 10-60min under conditions of temperature is 1000-1150 DEG C, is subsequently cooled to room
Temperature；
Two, carbon assigning process: sample after quenching, processes 0.5-60min under conditions of temperature is 150-450 DEG C；
Three, drawing process: sample after carbon distribution, processes 0.5-2h under conditions of temperature is 500-600 DEG C, then cools down
To room temperature, times of tempering: 1-3 time, i.e. complete to improve the heat treatment of bearing steel toughness.
Advantages of the present invention is as follows:
1, solving astable retained austenite in bearing steel to have a negative impact its performance this problem, this technology can carry
The stability of high retained austenite, is possible not only to ensure the dimensional accuracy of bearing, also can introduce a part in bearing steel stable
Retained austenite, improves Fracture of Material, and then improves the service life of bearing.
2, the hardness that the Bearing Steel obtained after treatment obtains with traditional Q-T technique is basically identical.
3, by the heat treatment of the present invention, bearing steel toughness can improve about 40%-90%.
Accompanying drawing explanation
Fig. 1 is the block diagram of the ballistic work of Q-P-T and Q-T Technology for Heating Processing in embodiment 1；
Fig. 2 is the block diagram of the hardness of Q-P-T and Q-T Technology for Heating Processing in embodiment 1.
Detailed description of the invention
Technical solution of the present invention is not limited to the detailed description of the invention of act set forth below, also includes between each detailed description of the invention
Combination in any.
Detailed description of the invention one: a kind of Technology for Heating Processing improving bearing steel toughness of present embodiment, realizes according to the following steps:
One, quenching process: bearing steel processes 10-60min under conditions of temperature is 1000-1150 DEG C, it is subsequently cooled to
Room temperature；
Two, carbon assigning process: sample after quenching, processes 0.5-60min under conditions of temperature is 150-450 DEG C, the coldest
But to room temperature；
Three, drawing process: sample after carbon distribution, processes 0.5-2h under conditions of temperature is 500-600 DEG C, then cools down
To room temperature, times of tempering: 1-3 time, i.e. complete to improve the heat treatment of bearing steel toughness.
Processing procedure in present embodiment can heat up with stove, it is possible to enters stove to temperature.
Present embodiment step one middle (center) bearing steel, such as M50, M50NiL, GCr15, G8Cr15, W18Cr4V, GCr18Mo,
G20CrNiMo, G55SiMoVA and various high-carbon-chromium bearing steel, it is not limited to bearing steel listed above.
Detailed description of the invention two: present embodiment is unlike detailed description of the invention one, and step one middle (center) bearing steel in temperature is
50min is processed under conditions of 1020 DEG C.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment is unlike detailed description of the invention one, and step one middle (center) bearing steel in temperature is
40min is processed under conditions of 1050 DEG C.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention four: present embodiment is unlike detailed description of the invention one, and step one middle (center) bearing steel in temperature is
30min is processed under conditions of 1100 DEG C.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention five: present embodiment, unlike detailed description of the invention one, is 160 DEG C in temperature in step 2
Under conditions of process 40min.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention six: present embodiment, unlike detailed description of the invention one, is 200 DEG C in temperature in step 2
Under conditions of process 30min.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention seven: present embodiment, unlike detailed description of the invention one, is 300 DEG C in temperature in step 2
Under conditions of process 20min.Other step and parameter are identical with detailed description of the invention one.
Detailed description of the invention eight: present embodiment, unlike detailed description of the invention one, is 520 DEG C in temperature in step 3
Under conditions of process 2h, be then cooled to room temperature, times of tempering: 3 times.Other step and parameter and detailed description of the invention one
Identical.
Detailed description of the invention nine: present embodiment, unlike detailed description of the invention one, is 550 DEG C in temperature in step 3
Under conditions of process 1h, be then cooled to room temperature, times of tempering: 2 times.Other step and parameter and detailed description of the invention one
Identical..
Detailed description of the invention ten: present embodiment, unlike detailed description of the invention one, is 590 DEG C in temperature in step 3
Under conditions of process 0.5h, be then cooled to room temperature, times of tempering: 1 time.Other step and parameter and detailed description of the invention
One is identical.
By following example checking beneficial effects of the present invention:
Embodiment 1
A kind of Technology for Heating Processing improving bearing steel toughness, realizes according to the following steps:
One, quenching process: bearing steel processes 30min under conditions of temperature is 1100 DEG C, is then cooled to room temperature；
Two, carbon assigning process: sample after quenching, processes 2min under conditions of temperature is 300 DEG C, is subsequently cooled to room
Temperature；
Three, drawing process: sample after carbon distribution, processes 1h under conditions of temperature is 550 DEG C, is then cooled to room temperature,
Times of tempering 1 time, i.e. completes to improve the heat treatment of bearing steel toughness.
The present embodiment step one middle (center) bearing steel uses M50 steel, processes through Q-P-T and Q-T Technology for Heating Processing respectively, wherein
Carbon allocation of parameters is 300 DEG C of-2min, and impact flexibility is respectively 20.1J and 10.5J, from figure 1 it appears that bearing steel
Toughness improves up to about 90%.From figure 2 it can be seen that the hardness of material is basic after Q-P-T and Q-T PROCESS FOR TREATMENT
Unanimously.
Embodiment 2
A kind of Technology for Heating Processing improving bearing steel toughness, realizes according to the following steps:
One, quenching process: bearing steel processes 30min under conditions of temperature is 1100 DEG C, is then cooled to room in air
Temperature；
Two, carbon assigning process: sample after quenching, processes 20min under conditions of temperature is 300 DEG C, is subsequently cooled to room
Temperature；
Three, drawing process: sample after carbon distribution, processes 1h under conditions of temperature is 550 DEG C, is then cooled to room temperature,
Times of tempering 1 time, i.e. completes to improve the heat treatment of bearing steel toughness.
The present embodiment step one middle (center) bearing steel uses M50 steel, processes through Q-P-T and Q-T Technology for Heating Processing respectively, wherein
Carbon allocation of parameters is 300 DEG C of-20min, and hardness is respectively HRC:62.3 after tested, the hardness obtained with traditional Q-T technique
Basically identical, impact flexibility is respectively 16.8J and 10.5J, it can be seen that bearing steel toughness improves up to about 60%.
Embodiment 3
A kind of Technology for Heating Processing improving bearing steel toughness, realizes according to the following steps:
One, quenching process: bearing steel processes 30min under conditions of temperature is 1100 DEG C, is then cooled to room temperature；
Two, carbon assigning process: sample after quenching, processes 24min under conditions of temperature is 250 DEG C, is subsequently cooled to room
Temperature；
Three, drawing process: sample after carbon distribution, processes 1h under conditions of temperature is 550 DEG C, is then cooled to room temperature,
Times of tempering 1 time, i.e. completes to improve the heat treatment of bearing steel toughness.
The present embodiment step one middle (center) bearing steel uses M50 steel, processes through Q-P-T and Q-T Technology for Heating Processing respectively, wherein
Carbon allocation of parameters is 250 DEG C of-24min, and impact flexibility is respectively 16.9J and 10.5J, it can be seen that bearing steel toughness improves
Up to about 60%.
Embodiment 4
A kind of Technology for Heating Processing improving bearing steel toughness, realizes according to the following steps:
One, quenching process: bearing steel processes 30min under conditions of temperature is 1100 DEG C, is then cooled to room temperature；
Two, carbon assigning process: sample after quenching, processes 8min under conditions of temperature is 300 DEG C, is subsequently cooled to room
Temperature；
Three, drawing process: sample after carbon distribution, processes 1h under conditions of temperature is 550 DEG C, is then cooled to room temperature,
Times of tempering 1 time, i.e. completes to improve the heat treatment of bearing steel toughness.
The present embodiment step one middle (center) bearing steel uses M50 steel, after tested hardness HRC:62.7, obtains with traditional Q-T technique
Hardness basically identical.Processing through Q-P-T and Q-T Technology for Heating Processing respectively, wherein carbon allocation of parameters is 300 DEG C of-8min,
Impact flexibility is respectively 18.0J and 10.5J, it can be seen that bearing steel toughness improves up to about 70%.
Claims (10)
1. the Technology for Heating Processing improving bearing steel toughness, it is characterised in that it realizes according to the following steps:
One, quenching process: bearing steel processes 10-60min under conditions of temperature is 1000-1150 DEG C, is then quenched to room temperature；
Two, carbon assigning process: sample after quenching, processes 0.5-60min under conditions of temperature is 150-450 DEG C, the coldest
But to room temperature；
Three, drawing process: sample after carbon distribution, processes 0.5-2h under conditions of temperature is 500-600 DEG C, is subsequently cooled to
Room temperature, times of tempering: 1-3 time, i.e. complete to improve the heat treatment of bearing steel toughness.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that step one axis
Hold steel under conditions of temperature is 1020 DEG C, processes 50min.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that step one axis
Hold steel under conditions of temperature is 1050 DEG C, processes 40min.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that step one axis
Hold steel under conditions of temperature is 1100 DEG C, processes 30min.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 2
Temperature processes 40min under conditions of being 160 DEG C.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 2
Temperature processes 30min under conditions of being 200 DEG C.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 2
Temperature processes 20min under conditions of being 300 DEG C.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 3
Temperature processes 2h under conditions of being 520 DEG C, is then cooled to room temperature, times of tempering: 3 times.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 3
Temperature processes 1h under conditions of being 550 DEG C, is then cooled to room temperature, times of tempering: 2 times.
A kind of Technology for Heating Processing improving bearing steel toughness the most according to claim 1, it is characterised in that in step 3
Under conditions of temperature is 590 DEG C, processes 0.5h, is then cooled to room temperature, times of tempering: 1 time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610407243.6A CN105821182B (en) | 2016-06-12 | 2016-06-12 | A kind of Technology for Heating Processing for improving bearing steel toughness |
Applications Claiming Priority (1)
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| CN201610407243.6A CN105821182B (en) | 2016-06-12 | 2016-06-12 | A kind of Technology for Heating Processing for improving bearing steel toughness |
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| CN105821182A true CN105821182A (en) | 2016-08-03 |
| CN105821182B CN105821182B (en) | 2017-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108411096A (en) * | 2018-02-06 | 2018-08-17 | 武汉理工大学 | Improve the forming manufacturing method of M50 bearing matrix obdurability and dimensional stability |
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|---|---|---|---|---|
| US4544422A (en) * | 1984-04-02 | 1985-10-01 | General Motors Corporation | Ferrite-austenite dual phase steel |
| CN101121955A (en) * | 2007-09-13 | 2008-02-13 | 上海交通大学 | Heat treatment method for increasing quenched steel component mechanical property by using carbon distribution and tempering |
| CN101368247A (en) * | 2008-09-16 | 2009-02-18 | 周向儒 | Novel chromium system hot die steel and thermal treatment process thereof |
| CN105648173A (en) * | 2014-12-04 | 2016-06-08 | 重庆旭新悦数控机械有限公司 | Heat treatment method of GCr15SiMn |
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2016
- 2016-06-12 CN CN201610407243.6A patent/CN105821182B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544422A (en) * | 1984-04-02 | 1985-10-01 | General Motors Corporation | Ferrite-austenite dual phase steel |
| CN101121955A (en) * | 2007-09-13 | 2008-02-13 | 上海交通大学 | Heat treatment method for increasing quenched steel component mechanical property by using carbon distribution and tempering |
| CN101368247A (en) * | 2008-09-16 | 2009-02-18 | 周向儒 | Novel chromium system hot die steel and thermal treatment process thereof |
| CN105648173A (en) * | 2014-12-04 | 2016-06-08 | 重庆旭新悦数控机械有限公司 | Heat treatment method of GCr15SiMn |
Non-Patent Citations (1)
| Title |
|---|
| 王康等: "16Cr14Co12Mo5耐热耐蚀轴承钢强韧化机制的研究", 《钢铁》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108411096A (en) * | 2018-02-06 | 2018-08-17 | 武汉理工大学 | Improve the forming manufacturing method of M50 bearing matrix obdurability and dimensional stability |
| CN108411096B (en) * | 2018-02-06 | 2019-05-24 | 武汉理工大学 | Improve the forming manufacturing method of M50 bearing matrix obdurability and dimensional stability |
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| CN105821182B (en) | 2017-11-17 |
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