CN106868257A - A kind of quenching assay method of test 42CrMo material cold shock structure properties - Google Patents
A kind of quenching assay method of test 42CrMo material cold shock structure properties Download PDFInfo
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- CN106868257A CN106868257A CN201510932622.2A CN201510932622A CN106868257A CN 106868257 A CN106868257 A CN 106868257A CN 201510932622 A CN201510932622 A CN 201510932622A CN 106868257 A CN106868257 A CN 106868257A
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- forging
- quenching
- 42crmo
- die joint
- cold shock
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Abstract
Suitable quenching technical is selected to be very much improved cold shock structure property the present invention relates to the thick forging part of 42CrMo materials effective cross-section.Present invention optimizes quenching scheme, improve material quenching degree so that material meets forging performance index, at the same also effectively avoid forging quenching process in the middle of, cracked at die joint, this method employs the process that water turns the quenching+tempering (water-cooled) of oil；Scribble sodium silicate and reduce cooldown rate with the violent position of forging process metal flow at die joint before the heat treatment simultaneously；Forging leaves certain flash before the heat treatment simultaneously.Physicochemical property can so be met, can also be evaded forging and be ftractureed at die joint, while also very economical material benefit.
Description
Technical field
Suitable quenching technical is selected to cold shock the present invention relates to the thick forging part of 42CrMo materials effective cross-section
Structure property is very much improved.
Background technology
Because high ferro drives part use environment, usually (≤- 20 DEG C) are used at a lower temperature, while again
Very big load is subject, the low-temperature impact structure property to material proposes requirement high.When crystal boundary summary table
When area increases, the concentration of impurity segregation will be reduced on crystal boundary, and adverse effect will be reduced, Transition of Brittleness
Temperature may be reduced.Because crystallite dimension is inversely proportional with crystal boundary total surface area, therefore crystal grain thinning is to improving material
The low-temperature impact of material improves.The main purpose of Tempering and Quenching is adjustment tissue, reduces carbide,
Sorbite or sorbite tissue and equally distributed granular carbide tissue are obtained, so as to improve combination property.
42CrMo material-structure class forging parts, and effective cross-section is thick, using common Tempering and Quenching, occurs
The problem of following several respects：
1st, using common mode oil quenching+tempering (air cooling/water-cooled), cold impact value is improper；Adjustment quenching,
Temperature, while not being greatly improved to impact value, thinks：Residual austenite in quenching process
Body is excessive, is changed in retained austenite drawing process.
2nd, using water quenching, seriously ftractureed at forging die joint, thought：Water quenching, cooldown rate is too fast, pole
Organizational hierarchy is easily produced at die joint and to be mingled with distribution, stress distribution relatively more, and water quenching generation group
Transformation is knitted, quenched martensite is formed, martensitic structure fragility is big.
3rd, it is relatively costly using polymer quenching liquid, while can also be cracked at die joint.
The content of the invention
The technical problems to be solved by the invention are：Optimization quenching scheme, improves the quenching degree of material so that material
Material meet forging performance index, while also effectively avoid forging quenching process in the middle of, at die joint
Crack, we employ the process program that a kind of water (20S) turns the quenching+tempering (water-cooled) of oil；
Scribble sodium silicate and reduce cold with the violent position of forging process metal flow at die joint before the heat treatment simultaneously
But speed；Forging leaves certain flash before the heat treatment simultaneously.Draw a conclusion：Reason can so be met
Change performance, can also evade forging and be ftractureed at die joint, while also very economical material benefit.
The technical scheme is that：
A kind of quenching assay method of test 42CrMo material cold shock structure properties, including following step are provided
Suddenly：
The forging of 42CrMo is fitted into electric furnace and is heated, heating-up temperature is 850 DEG C,
Three 42CrMo forging are left the remaining flash of 20mm at die joint, and by remaining flash cusped edge
Polishing is round and smooth, and at the flash brush sodium silicate reducing cooldown rate；Then again by described three
42CrMo forging is heated in being fitted into identical glowing furnace simultaneously, and enters stove no more than 650 DEG C, afterwards with stove
700 ± 10 DEG C are warming up to, after being incubated 60 ± 6 minutes, then 830 DEG C is warming up to；Finally, by described three
Forging part carries out temper in being fitted into electric furnace, and temperature is 630 DEG C, and soaking time is 300 minutes,
Tempering carries out water-cooled again after terminating.
The beneficial effects of the invention are as follows：
1st, using this quenching technical, cold shock and the other performance index of forging be disclosure satisfy that so that 42CrMo
Material is more and more extensive in the application of low temperature field；
2nd, using this quenching technical, also cause that forging reduces the generation of crackle at die joint, reduces forging
Scrappage so that the utilization rate of material is very significantly improved；
3rd, 42CrMo is medium carbon low alloy steel structure steel, with good quenching degree, employs this quenching technical,
Enable forging through hardening so that forging performance index is greatly improved.
Specific embodiment
The present invention is described in further detail below by specific embodiment.
A kind of quenching assay method of test 42CrMo material cold shock structure properties, including following step are provided
Suddenly：
The forging of 42CrMo is fitted into electric furnace and is heated, heating-up temperature is 850 DEG C,
Three 42CrMo forging are left the remaining flash of 20mm at die joint, and by remaining flash cusped edge
Polishing is round and smooth, and at the flash brush sodium silicate reducing cooldown rate；Then again by described three
42CrMo forging is heated in being fitted into identical glowing furnace simultaneously, and enters stove no more than 650 DEG C, afterwards with stove
700 ± 10 DEG C are warming up to, after being incubated 60 ± 6 minutes, then 830 DEG C is warming up to；Finally, by described three
Forging part carries out temper in being fitted into electric furnace, and temperature is 630 DEG C, and soaking time is 300 minutes,
Tempering carries out water-cooled again after terminating.
Claims (1)
1. a kind of quenching assay method of test 42CrMo material cold shock structure properties, comprises the following steps：
The forging of 42CrMo is fitted into electric furnace and is heated, heating-up temperature is 850 DEG C, afterwards by three
42CrMo forging leaves the remaining flash of 20mm at die joint, and will polish round and smooth at remaining flash cusped edge,
And at the flash brush sodium silicate reducing cooldown rate；Then it is again that three described 42CrMo forging are same
When be fitted into identical glowing furnace and heated, and enter stove no more than 650 DEG C, be warming up to stove afterwards
700 ± 10 DEG C, after being incubated 60 ± 6 minutes, then it is warming up to 830 DEG C；Finally, by three described forging parts
Being fitted into electric furnace carries out temper, and temperature is 630 DEG C, and soaking time is 300 minutes, tempering
Water-cooled is carried out after end again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932622.2A CN106868257A (en) | 2015-12-14 | 2015-12-14 | A kind of quenching assay method of test 42CrMo material cold shock structure properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932622.2A CN106868257A (en) | 2015-12-14 | 2015-12-14 | A kind of quenching assay method of test 42CrMo material cold shock structure properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106868257A true CN106868257A (en) | 2017-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510932622.2A Pending CN106868257A (en) | 2015-12-14 | 2015-12-14 | A kind of quenching assay method of test 42CrMo material cold shock structure properties |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679213A (en) * | 2022-11-01 | 2023-02-03 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling total section hardness difference of 42CrMo forge piece |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358279A (en) * | 2008-10-06 | 2009-02-04 | 洛阳市双勇机器制造有限公司 | Technique and method for preparing biconical roller of large-sized strip hot-rolling mill transport roller |
| CN103451385A (en) * | 2013-08-30 | 2013-12-18 | 马鞍山市晨旭机械制造有限公司 | Tempering technology of ring die of 42CrMo steel pellet mill |
| CN104209704A (en) * | 2014-08-21 | 2014-12-17 | 无锡市陆区内河装卸机械厂 | Simple manufacturing technology of end socket |
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
-
2015
- 2015-12-14 CN CN201510932622.2A patent/CN106868257A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358279A (en) * | 2008-10-06 | 2009-02-04 | 洛阳市双勇机器制造有限公司 | Technique and method for preparing biconical roller of large-sized strip hot-rolling mill transport roller |
| CN103451385A (en) * | 2013-08-30 | 2013-12-18 | 马鞍山市晨旭机械制造有限公司 | Tempering technology of ring die of 42CrMo steel pellet mill |
| CN104232875A (en) * | 2014-07-17 | 2014-12-24 | 北京科技大学 | Heat treatment process of bearing ring (3m) of shield tunneling machine |
| CN104209704A (en) * | 2014-08-21 | 2014-12-17 | 无锡市陆区内河装卸机械厂 | Simple manufacturing technology of end socket |
Non-Patent Citations (2)
| Title |
|---|
| 符寒光: "《耐磨材料500问》", 31 October 2011, 机械工业出版社 * |
| 雷廷权等: "《热处理工艺方法 300种》", 31 March 1982, 中国农业机械出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679213A (en) * | 2022-11-01 | 2023-02-03 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling total section hardness difference of 42CrMo forge piece |
| CN115679213B (en) * | 2022-11-01 | 2023-08-25 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling full-section hardness difference of 42CrMo forge piece |
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Application publication date: 20170620 |
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