CN105525077A - Heating processing technology for improving mechanical property of spring steel - Google Patents
Heating processing technology for improving mechanical property of spring steel Download PDFInfo
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- CN105525077A CN105525077A CN201410517701.2A CN201410517701A CN105525077A CN 105525077 A CN105525077 A CN 105525077A CN 201410517701 A CN201410517701 A CN 201410517701A CN 105525077 A CN105525077 A CN 105525077A
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- spring steel
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Abstract
The invention discloses a heating processing technology for improving the mechanical property of spring steel. The heating processing technology is characterized in that the spring steel is subject to quenching at 870 DEG C, the quenching soaking time is 30 min, and a quenching medium is subject to oil cooling; and then salt bath isothermal treatment is carried out for 3 h at 280 DEG C, and oil cooling or tempering at 420 DEG C is carried out. The optimal process is characterized in that the spring steel is subject to quenching at 870 DEG C, the quenching soaking time is 30 min, and the quenching medium is subject to oil cooling; and salt bath isothermal treatment is carried out for 3 h at 280 DEG C, and oil cooling is carried out.
Description
Technical field
The present invention relates to a kind of thermal treatment process improving spring steel mechanical property.
Background technology
Thermal treatment is the Main Means improving mechanical property, and for most of spring steel, its traditional technology is oil quenching-average tempering, and this technique can ensure to have higher intensity and the elastic fatigue limit, but by putting into practice this technique known and usually occur the phenomenon of unstable properties.In order to make this spring steel have better over-all properties, in recent years, researcher have developed increasing novel process.Herein employing two kinds of novel procesies and traditional technology are contrasted to study these three kinds of thermal treatment process to the impact of this spring steel Microstructure and properties.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of thermal treatment process improving spring steel mechanical property, solve the deficiencies in the prior art.
Technical scheme of the present invention is: a kind of thermal treatment process improving spring steel mechanical property, and spring steel quenches at 870 DEG C, and Quenching Soaking Time is 30min, and quenchant adopts oil cooling, then 280 DEG C of salt bath isothermal 3h, and oil cooling gets final product or 420 DEG C of tempering.
Optimised process is: spring steel quenches at 870 DEG C, and Quenching Soaking Time is 30min, and quenchant adopts oil cooling, then 280 DEG C of salt bath isothermal 3h, oil cooling.
Beneficial effect of the present invention: the test-results after 3 kinds of different heat treatment art breading shows, 60Si2CrVAT spring steel comprehensive mechanical property after technique 2 processes is best, this is that the martensite contained in the 60Si2CrVAT spring steel tissue owing to processing through technique 2 ensure that its higher intensity, and more residual austenite and lower bainite make it have good plasticity and toughness.
accompanying drawing explanation
Fig. 1 is the microstructure of the 60Si2CrVAT under different heat treatment.
Embodiment
The material that this test adopts is 60Si2CrVAT spring steel, and its chemical composition is as following table 1.
2. thermal treatment process
Concrete thermal treatment process is as table 2.
3. test-results and analysis
(1) on the impact of mechanical property
Sample after thermal treatment is processed into standard tensile specimen, then on INSTRON8501 trier, carries out tension test.Test-results is as table 3.
As can be seen from Table 3, technique 1(traditional technology) although ensure that the intensity that material is higher, plasticity and toughness are relatively low low.And its impelling strength, intensity and hardness significantly improve compared with other two techniques after technique 2 processes, and also there is good plasticity.Because traditional technology and technique 3 have all carried out temper, in drawing process, residual austenite is decomposed in a large number, and residual austenite volume fraction is obviously reduced, and the minimizing of remained austenite content is the major cause causing material plasticity and toughness to decline.Epochmaking effect is played according to the plasticity and toughness of the known residual austenite of document to material, the effect due to phase change induction plasticity on the one hand, in addition in deformation process, residual austenite constantly can absorb the dislocation in adjacent martensite lath, average dislocation density in martensite is reduced, and residual austenite can also stop tiny crack to be propagated effectively.In the homogeneous deformation stage, residual austenite absorbs the deformability that dislocation effect enhances martensitic phase, and this is also the major reason causing material plasticity and toughness to increase.Therefore, in technique 2, higher residual austenite content ensure that the plasticity and toughness that material is good.In drawing process, martensite decomposes, dissolved carbon content in martensite reduces, in formation tempered martensite process, the strengthening mechanism of steel becomes precipitation strength by solution strengthening, because Second Phase Precipitation strengthening effect is lower than solution hardening effect, therefore, after tempering, intensity, the hardness of steel obviously reduce.Therefore the 60Si2CrVA spring steel after technique 2 processes has good over-all properties.
(2) on the impact of microstructure
Sample Linear cut after thermal treatment is cut into metallographic specimen, through grinding, utilizes 4% nitric acid alcohol to corrode after polishing, finally observing with metaloscope.The metallograph obtained under each different heat treatment state as shown in Figure 1.
Fig. 1 is the microstructure of steel under three kinds of thermal treatment process states.Utilize metaloscope and coordinate x-ray stress analyzer, result shows, the microstructure through technique 2 process is mainly the residual austenite of martensite, a small amount of bainite and film like.Steel defines a certain amount of martensite during first time oil quenching after austenitizing, and the temperature of steel is reduced, and the austenitic transformation that part does not change in isothermal process is subsequently the lower bainite tissue that obdurability is high.Because the Si content in spring steel used in this experiment is higher, Si element restrained effectively the precipitation of carbide, carbon in isothermal process is made to residual austenite, to there occurs diffusion from martensite, make the rich carbon of residual austenite, reduce the Ms point of steel, thus improve the stability of residual austenite, obtain more remained austenite content when being cooled to room temperature.Be organized as tempered martensite and a small amount of residual austenite through traditional technology process gained spring steel, the spring steel tissue that technique 3 processes is tempering troostite.
Test-results after 3 kinds of different heat treatment art breading shows, 60Si2CrVAT spring steel comprehensive mechanical property after technique 2 processes is best, this is that the martensite contained in the 60Si2CrVAT spring steel tissue owing to processing through technique 2 ensure that its higher intensity, and more residual austenite and lower bainite make it have good plasticity and toughness.
Claims (2)
1. improve a thermal treatment process for spring steel mechanical property, it is characterized in that: spring steel quenches at 870 DEG C, Quenching Soaking Time is 30min, and quenchant adopts oil cooling, then 280 DEG C of salt bath isothermal 3h, and oil cooling gets final product or 420 DEG C of tempering.
2. a kind of thermal treatment process improving spring steel mechanical property according to claim 1, it is characterized in that: optimised process is: spring steel quenches at 870 DEG C, Quenching Soaking Time is 30min, and quenchant adopts oil cooling, then 280 DEG C of salt bath isothermal 3h, oil cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410517701.2A CN105525077A (en) | 2014-09-30 | 2014-09-30 | Heating processing technology for improving mechanical property of spring steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410517701.2A CN105525077A (en) | 2014-09-30 | 2014-09-30 | Heating processing technology for improving mechanical property of spring steel |
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| CN105525077A true CN105525077A (en) | 2016-04-27 |
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| CN201410517701.2A Pending CN105525077A (en) | 2014-09-30 | 2014-09-30 | Heating processing technology for improving mechanical property of spring steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541590A (en) * | 2017-10-27 | 2018-01-05 | 北京卡特刘科技有限公司 | A kind of heat treatment method for alloy spring steel |
| CN108384931A (en) * | 2018-04-10 | 2018-08-10 | 武汉理工大学 | A kind of fuse salt phase change medium for spring steel grade quench |
| CN108642267A (en) * | 2018-05-21 | 2018-10-12 | 苏州启航不锈钢制品有限公司 | A kind of process units and production technology of spring essence line |
-
2014
- 2014-09-30 CN CN201410517701.2A patent/CN105525077A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541590A (en) * | 2017-10-27 | 2018-01-05 | 北京卡特刘科技有限公司 | A kind of heat treatment method for alloy spring steel |
| CN108384931A (en) * | 2018-04-10 | 2018-08-10 | 武汉理工大学 | A kind of fuse salt phase change medium for spring steel grade quench |
| CN108642267A (en) * | 2018-05-21 | 2018-10-12 | 苏州启航不锈钢制品有限公司 | A kind of process units and production technology of spring essence line |
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Application publication date: 20160427 |