CN107779566A - A kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging - Google Patents
A kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging Download PDFInfo
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- CN107779566A CN107779566A CN201711036371.5A CN201711036371A CN107779566A CN 107779566 A CN107779566 A CN 107779566A CN 201711036371 A CN201711036371 A CN 201711036371A CN 107779566 A CN107779566 A CN 107779566A
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- forging
- 40crnimo
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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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging.Austenitizing temperature of the invention by improving 40CrNiMo forging, using controlled cooling quenching, adjust temperature, so that the yield strength and tensile strength of the detection of 40CrNiMo forging bodies significantly exceed with prismatic intensity using normal quenching tempering process forging, simultaneously, its plasticity index does not reduce, and low-temperature impact toughness is still fine.
Description
Technical field
The present invention relates to forging technical field of heat treatment, more particularly to a kind of high-intensity high-tenacity 40CrNiMo forging
Heat treatment method.
Background technology
40CrNiMo is a kind of high-strength alloy structural steel having compared with high-hardenability, using the forging of 40CrNiMo steel making
Part, by normalizing+modifier treatment after the forging of routine, routine techniques is：860 DEG C of -880 DEG C of progress austenitizings, Ran Houkong after forging
It is cold, the normalized treatment of forging is realized with this.Then austenitizing is carried out using 850 DEG C -860 DEG C, using oil cooling, organic quenching liquid
The slower hardening medias of cooling velocity such as cooling are cooled down, and the Quenching Treatment of forging is realized with this.And use 580 DEG C -650 DEG C
Temper is carried out, the handling process can obtain higher intensity, but plasticity and toughness are general, and impact flexibility can reduce.How
40CrNiMo forging is allowed while high intensity is obtained, it is also possible to obtain high tenacity.
The content of the invention
The present invention is provided aiming at above-mentioned defect at a kind of heat of high-intensity high-tenacity 40CrNiMo forging
Reason method.Austenitizing temperature of the invention by improving 40CrNiMo forging, using controlled cooling quenching, temperature is adjusted, is made
Obtain the yield strength of 40CrNiMo forging bodies detection and tensile strength significantly exceedes with prismatic using normal quenching tempering
The intensity of technique forging, meanwhile, its plasticity index（Elongation percentage and the contraction percentage of area）Do not reduce, low-temperature impact toughness is still very
It is good.
A kind of heat treatment method technical scheme of high-intensity high-tenacity 40CrNiMo forging of the present invention is,
（1）Using normalized treatment after forging, austenitizing temperature is 920 ± 10 DEG C during normalizing, and insulation implements air cooling after terminating；
（2）During quenching, using 900 ± 10 DEG C of progress austenitizings, after insulation terminates, first using water cooling, then again using organic
The method that quenching liquid is cooled down enters quenching cooling；
（3）Using 600 ± 10 DEG C of progress tempers.
Step（1）In, forging is heated to 920 ± 10 DEG C and is incubated, and soaking time is according to the thickness of 40CrNiMo forging
Calculated according to equation below：
t=α·d
Wherein, t is soaking time, unit min
α is coefficient, value 1.0-1.5, unit min/mm
D be forging effective thickness, unit mm.
Step（2）Specially：
1. the forging of temperature≤300 DEG C is warming up to 650 ± 10 DEG C with≤120 DEG C/h speed and is incubated 1h；
2. being warming up to 900 ± 10 DEG C by power and being incubated, soaking time is according to the thickness of 40CrNiMo forging according to equation below
Calculate：
t=α·d
Wherein, t is soaking time, unit min
α is coefficient, value 0.8-1.5, unit min/mm
D be forging effective thickness, unit mm.
3. being cooled to 230 DEG C, enter stove tempering.
3. step is specially：It is transferred quickly to after coming out of the stove above tank, is cooled to 850 DEG C of forging surface in advance and enters water cooling；Water
Cold 5 minutes, air cooling 30 seconds；Water cooling 2 minutes, turn quenching liquid cooling；Transfer and air cooling are total 1 minute, and quenching liquid cools down 4 minutes,
Enter stove tempering.
Organic quenching liquid is mass concentration 8%-10% polyvinyl alcohol water solution and the mass concentration 8%-10% PAG aqueous solution
At least one of
Step（3）Specially：
2. forging is entered into stove under the conditions of 300 ± 10 DEG C is incubated 1h；
2. being warming up to 600 ± 10 DEG C and being incubated, soaking time calculates according to the thickness of 40CrNiMo forging according to equation below：
t=α·d
Wherein, t is soaking time, unit min
α is coefficient, value 1.2-2.0, unit min/mm
D be forging effective thickness, unit mm；
3. air cooling.
Beneficial effects of the present invention are：
Using higher austenitizing temperature when the 1st, quenching, increase the solid solubility of alloying element in austenite, be advantageous to alloy member
Homogenization of the element in austenite, meanwhile, using 900 ± 10 DEG C of progress austenitizings, austenite crystal transition can be avoided to grow
Greatly, prevent during quenching because coarse grains increase hardening break risk；
2nd, quenching cooling uses first water cooling, then the mode cooled down with organic quenching liquid, so, the high temperature rank after forging is come out of the stove
Section, implement fast speed and cooled down, degree of supercooling during martensite transfor mation can be effectively increased, increase cold near critical-temperature
But speed, so as to be advantageous to improve the intensity and hardness after forging quenching, improve the resistance to tempering of forging；
When the 3rd, being tempered, the higher temperature of use, on the premise of forging intensity and hardness is ensured, the modeling of forging after tempering is improved
Property and toughness.
Embodiment：
For a better understanding of the present invention, technical scheme is described in detail with instantiation below, but it is of the invention
It is not limited thereto.
Embodiment 1
A kind of specification is the φ 80 × 359 of φ 140/（Unit：mm）Axle class 40CrNiMo forging heat treatment method
（1）Using normalized treatment after forging, austenitizing temperature is 920 ± 10 DEG C during normalizing, and insulation 3.0h implements air cooling after terminating；
（2）During quenching,
1. the forging of temperature≤300 DEG C is warming up to 650 ± 10 DEG C with≤120 DEG C/h speed and is incubated 1h；
2. it is warming up to 900 ± 10 DEG C by power and is incubated 2.5h；
3. being transferred quickly to after coming out of the stove above tank, it is cooled to 850 DEG C of forging surface in advance and enters water cooling；Water cooling 5 minutes, air cooling 30
Second；Water cooling 2 minutes, turn quenching liquid cooling；Transfer and air cooling are total 1 minute, cold in the polyvinyl alcohol water solution that concentration is 8%
But 4 minutes, 230 DEG C are cooled to, enters stove tempering.
（3）1. forging is entered into stove under the conditions of 300 ± 10 DEG C is incubated 1h；
2. it is warming up to 600 ± 10 DEG C and is incubated 4h；
3. air cooling.
The 40CrNiMo forging handled in this way, its body surface hardness 300-330HB, body sampling mechanical property
Energy testing result is as shown in table 1.
Bulk properties after the heat treatment of the high-intensity high-tenacity 40CrNiMo forging of table 1
| Technical requirements | Rp0.2（MPa） | Rm（MPa） | A（%） | Z（%） | - 29 DEG C, Kv（J） |
| Standard requirement | ≥835 | ≥980 | ≥10 | ≥45 | Ku≥70 |
| Actual measurement | 951 | 1080 | 19.5 | 62.0 | 70.8,71.8,72.8 |
Claims (6)
- A kind of 1. heat treatment method of high-intensity high-tenacity 40CrNiMo forging, it is characterised in that（1）Using normalized treatment after forging, austenitizing temperature is 920 ± 10 DEG C during normalizing, and insulation implements air cooling after terminating；（2）During quenching, using 900 ± 10 DEG C of progress austenitizings, after insulation terminates, first using water cooling, then again using organic The method that quenching liquid is cooled down enters quenching cooling；（3）Using 600 ± 10 DEG C of progress tempers.
- 2. a kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging according to claim 1, its feature exist In step（1）In, forging is heated to 920 ± 10 DEG C and is incubated, and soaking time is according to the thickness of 40CrNiMo forging according to such as Lower formula calculates：t=α·dWherein, t is soaking time, unit minα is coefficient, value 1.0-1.5, unit min/mmD be forging effective thickness, unit mm.
- A kind of 3. heat treatment method of high-intensity high-tenacity 40CrNiMo forging according to claim 1, it is characterised in that Step（2）Specially：1. the forging of temperature≤300 DEG C is warming up to 650 ± 10 DEG C with≤120 DEG C/h speed and is incubated 1h；2. being warming up to 900 ± 10 DEG C by power and being incubated, soaking time is according to the thickness of 40CrNiMo forging according to equation below Calculate：t=α·dWherein, t is soaking time, unit minα is coefficient, value 0.8-1.5, unit min/mmD be forging effective thickness, unit mm；3. being cooled to 230 DEG C, enter stove tempering.
- A kind of 4. heat treatment method of high-intensity high-tenacity 40CrNiMo forging according to claim 3, it is characterised in that 3. step is specially：It is transferred quickly to after coming out of the stove above tank, is cooled to 850 DEG C of forging surface in advance and enters water cooling；Water cooling 5 minutes, Air cooling 30 seconds；Water cooling 2 minutes, turn quenching liquid cooling；Transfer and air cooling are total 1 minute, and quenching liquid cools down 4 minutes, enter stove tempering.
- A kind of 5. heat treatment method of high-intensity high-tenacity 40CrNiMo forging according to claim 1, it is characterised in that Step（2）In, the polyvinyl alcohol water solution and mass concentration 8%-10% PAG that organic quenching liquid is mass concentration 8%-10% are water-soluble At least one of liquid.
- A kind of 6. heat treatment method of high-intensity high-tenacity 40CrNiMo forging according to claim 1, it is characterised in that Step（3）Specially：1. forging is entered into stove under the conditions of 300 ± 10 DEG C is incubated 1h；2. being warming up to 600 ± 10 DEG C and being incubated, soaking time calculates according to the thickness of 40CrNiMo forging according to equation below：t=α·dWherein, t is soaking time, unit minα is coefficient, value 1.2-2.0, unit min/mmD be forging effective thickness, unit mm；3. air cooling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375882A (en) * | 2020-11-19 | 2021-02-19 | 太原理工大学 | Heat treatment process for improving strength of flexible gear 40CrNiMo steel |
| CN115595508A (en) * | 2022-11-08 | 2023-01-13 | 山西百一机械设备制造有限公司（Cn） | Alloy structural steel for coiler sleeve and preparation method thereof |
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| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN102242322A (en) * | 2011-06-29 | 2011-11-16 | 江苏环立板带轧辊有限公司 | Improved 40CrNiMo steel and preparation method thereof |
| CN103421940A (en) * | 2013-09-05 | 2013-12-04 | 中原特钢股份有限公司 | Technological method for AISI4140 and AISI 4340 constructional steel forged piece quenching and tempering through one-time thermal cycling |
| CN104975148A (en) * | 2015-07-20 | 2015-10-14 | 江阴东邦钢球机械有限公司 | Double-liquid quenching method for steel balls or steel forgings |
| CN106011396A (en) * | 2016-07-08 | 2016-10-12 | 杭州汽轮铸锻有限公司 | Quenching method for improving mechanical property of large forging |
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2017
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4357299A (en) * | 1981-04-02 | 1982-11-02 | Gte Products Corporation | Brazing alloy filler for joining cemented carbide to steel |
| CN1888089A (en) * | 2006-07-14 | 2007-01-03 | 沪东重机股份有限公司 | Heat treatment process of important screw of marine diesel engine |
| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN102242322A (en) * | 2011-06-29 | 2011-11-16 | 江苏环立板带轧辊有限公司 | Improved 40CrNiMo steel and preparation method thereof |
| CN103421940A (en) * | 2013-09-05 | 2013-12-04 | 中原特钢股份有限公司 | Technological method for AISI4140 and AISI 4340 constructional steel forged piece quenching and tempering through one-time thermal cycling |
| CN104975148A (en) * | 2015-07-20 | 2015-10-14 | 江阴东邦钢球机械有限公司 | Double-liquid quenching method for steel balls or steel forgings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375882A (en) * | 2020-11-19 | 2021-02-19 | 太原理工大学 | Heat treatment process for improving strength of flexible gear 40CrNiMo steel |
| CN115595508A (en) * | 2022-11-08 | 2023-01-13 | 山西百一机械设备制造有限公司（Cn） | Alloy structural steel for coiler sleeve and preparation method thereof |
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| CN107779566B (en) | 2019-05-14 |
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Address after: No. 9001, Zhangqiu Ji Wang Road, Ji'nan, Shandong Province Patentee after: Elite Energy Equipment Co., Ltd. Address before: No. 9001, Zhangqiu Ji Wang Road, Ji'nan, Shandong Province Patentee before: SHANDONG IRAETA HEAVY INDUSTRY CO., LTD. |