CN103103320B - Method for improving low-temperature impact toughness of 40CrNiMoA material - Google Patents
Method for improving low-temperature impact toughness of 40CrNiMoA material Download PDFInfo
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- CN103103320B CN103103320B CN201310054382.1A CN201310054382A CN103103320B CN 103103320 B CN103103320 B CN 103103320B CN 201310054382 A CN201310054382 A CN 201310054382A CN 103103320 B CN103103320 B CN 103103320B
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract 2
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a method for improving the low-temperature impact toughness of a 40CrNiMoA material, which comprises the steps of firstly cooling the 40CrNiMoA material to minus 80 ℃ to minus 85 ℃ at the speed of 2-3 ℃/min, and preserving the heat for 0.5-1 h; after the heat preservation is finished, continuously cooling to-180 ℃ to-185 ℃, and preserving the heat for 2 h-3 h; and after the heat preservation is finished, continuously heating to 160-170 ℃ at the speed of 2-3 ℃/min, preserving the heat for 1-2 h, cooling along with the furnace, and finishing the process. After the 40CrNiMoA material is treated by the method, the low-temperature impact toughness of the material is higher than that of the material which is not subjected to cryogenic cooling and low-temperature tempering treatment, so the method has a larger industrial application prospect.
Description
Technical field
The present invention relates to sub-zero treatment and heat treated technical field, be specifically related to a kind of method improving 40CrNiMoA material at low temperature impelling strength.
Background technology
40CrNiMoA steel has higher intensity and toughness, and hardening capacity is also fine, is widely used in petrochemical complex, petroleum drilling and mining equipment, offshore oil drilling platform and cross section and the larger strength member etc. of load.In order to give full play to its comprehensive mechanical property, all use under quality adjustment condition.Because the service condition of petroleum drilling and mining equipment is very severe, wherein many is work in severe cold environment, and the low temperature impact properties for material has certain requirement.On the other hand, the important evidence when low temperature impact properties of material is also structure design.The cryomechanics behavior of metallic substance has material impact to the military service of equipment and security, and the data of the low-temperature impact toughness aspect of 40CrNiMoA material compare shortage, particularly the impelling strength of less than-60 DEG C temperature has no report, thus brings disadvantageous effect to the actual design of 40CrNiMoA material and application.
Along with the development of China's industrial technology and the harshness of working conditions, the low-temperature flexibility of material 40CrNiMoA is had higher requirement.The present invention intends the low-temperature impact toughness being improved 40CrNiMoA material by deep cooling and low-temperaturetempering treatment process, improves its military service performance.
Summary of the invention
The object of the present invention is to provide a kind of method improving 40CrNiMoA material at low temperature impelling strength, have employed the technique that sub-zero treatment combines with low-temperaturetempering, concrete technical scheme is as follows:
A kind of method improving 40CrNiMoA material at low temperature impelling strength, comprise the following steps: the 40CrNiMoA material through vacuum oil quenching and vacuum high-temperature tempering is cooled to-80 DEG C ~-85 DEG C with the speed of 2 ~ 3 DEG C/min, and be incubated 0.5h ~ 1h, insulation terminates rear continuation and is cooled to-180 DEG C ~-185 DEG C with the speed of 2 ~ 3 DEG C/min, and is incubated 2h ~ 3h; Finally carry out low-temperaturetempering.
Further, described low-temperaturetempering is for being heated to 160 ~ 170 DEG C.
Again further, after being heated to 160 ~ 170 DEG C, be incubated 1 ~ 2 hour.
Preferably, described low-temperaturetempering temperature-rise period adopts the temperature control speed of 2 ~ 3 DEG C/min.
Preferably, furnace cooling after described low-temperaturetempering.
Present invention employs the art treatment that sub-zero treatment combines with low-temperaturetempering.Sub-zero treatment, be often referred to the deepfreeze that treatment temp is-100 DEG C ~-196 DEG C, processed workpiece is placed in specific and controlled low temperature environment by it, the heterogeneous microstructure of material is changed, in the raising macroscopically shown as in the wear resistance, dimensional stability, tensile strength, unrelieved stress, toughness etc. of material and improvement.The technique that sub-zero treatment of the present invention combines with low-temperaturetempering, it is advantageous that cooling and temperature-rise period medium-rate whole process controlled, workpiece temperature change is even, and the phenomenon preventing workpiece different sites temperature to differ, reduces inside workpiece unrelieved stress.
By analyzing known to the heterogeneous microstructure of material 40CrNiMoA, after sub-zero treatment and low-temperaturetempering, it is more that material has separated out quantity in the inside of crystal grain and crystal boundary, the tiny carbide particle of Dispersed precipitate, this is mainly because material is in sub-zero treatment process, residual austenite increases to the phase driving force of martensitic transformation, causes matrix material to shrink, and causes the lattice constant of iron-based body to reduce.This can produce very large microcosmic internal stress and Light deformation on the one hand in the base, and lattice defect is significantly increased; The lattice distortion on the other hand supersaturation carbon being caused increases, and causes the thermodynamic driving force of carbide precipitate to increase.Therefore in the process subsequently to room temperature rise and follow-up low-temperaturetempering, the diffusibility of carbon atom strengthens, and causes separating out at lattice defect place the tiny carbide with matrix coherence.In addition, by sub-zero treatment and follow-up low-temperaturetempering, the unrelieved stress that material produces in vacuum oil quenching, vacuum high-temperature drawing process is reduced.
40CrNiMoA material is after method process of the present invention, the low-temperature impact toughness of material is greatly improved compared with the material without deep cooling and low-temperaturetempering process, therefore improve material active time at low temperatures to a certain extent, extend work-ing life.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
embodiment 1
By the 40CrNiMoA material after vacuum oil quenching and vacuum high-temperature tempering, be cooled to-80 DEG C with the speed of 2 DEG C/min, insulation 0.5h;
Then continue to be cooled to-180 DEG C with the speed of 2 DEG C/min, insulation 3h; Subsequently by this 40CrNiMoA material with the heating rate to 160 DEG C of 2 DEG C/min, insulation 2h; Low-temperaturetempering technique terminates rear furnace cooling.
40CrNiMoA material after process is carried out to the low temperature impact properties test under differing temps, used test method adopts standard GB/T/T 229-2007 " metallic substance Charpy pendulum impact test method ", and test result is as shown in table 1.
embodiment 2
40CrNiMoA material (material is with embodiment 1) after vacuum oil quenching and vacuum high-temperature tempering is cooled to-85 DEG C with the speed of 3 DEG C/min, insulation 1h; Then continue to be cooled to-180 DEG C with the speed of 3 DEG C/min, insulation 2h; Subsequently by this 40CrNiMoA material with the heating rate to 170 DEG C of 3 DEG C/min, insulation 2h; Low-temperaturetempering technique terminates rear furnace cooling.
40CrNiMoA after process is carried out to the low temperature impact properties test under differing temps, used test method all adopts standard GB/T/T 229-2007 " metallic substance Charpy pendulum impact test method ", and test result is as shown in table 1.
Comparative example 1, by the 40CrNiMoA material (material is with embodiment 1) after vacuum oil quenching and vacuum high-temperature tempering, without sub-zero treatment and low-temperaturetempering process, carry out the low temperature impact properties test under differing temps, used test method all adopts respective country standard, and test result is as shown in table 1.
The 40CrNiMoA Impact Properties of Materials test result of table 1 embodiment 1 ~ 2 and comparative example 1
As shown in table 1, after method process of the present invention, the low-temperature impact toughness of 40CrNiMoA material is all high than the material without deep cooling and low-temperaturetempering process, therefore by art treatment of the present invention, 40CrNiMoA material extends the work-ing life under low temperature, can meet the long-term normal work under comparatively atrocious weather envrionment conditions of product and equipment.
Claims (2)
1. one kind is improved the method for 40CrNiMoA material at low temperature impelling strength, it is characterized in that: the 40CrNiMoA material through vacuum oil quenching and vacuum high-temperature tempering is cooled to-80 DEG C ~-85 DEG C with the speed of 2 ~ 3 DEG C/min, and be incubated 0.5h ~ 1h, insulation terminates rear continuation and is cooled to-180 DEG C ~-185 DEG C with the speed of 2 ~ 3 DEG C/min, and is incubated 2h ~ 3h; Finally carry out low-temperaturetempering;
Described low-temperaturetempering, for being heated to 160 DEG C ~ 170 DEG C, is then incubated 1h ~ 2h;
Described low-temperaturetempering temperature-rise period adopts the temperature control speed of 2 ~ 3 DEG C/min.
2. a kind of method improving 40CrNiMoA material at low temperature impelling strength according to claim 1, is characterized in that: furnace cooling after described low-temperaturetempering.
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| CN103305669B (en) * | 2013-06-14 | 2015-10-07 | 中国科学院理化技术研究所 | Cryogenic treatment method for improving dimensional stability of GCr15 steel |
| CN108531700A (en) * | 2018-03-26 | 2018-09-14 | 西南大学 | A kind of cryogenic treatment process improving the quenched Steel Properties of 42CrMo |
| CN109022687A (en) * | 2018-07-27 | 2018-12-18 | 上海工程技术大学 | A kind of cryogenic treatment process of joint of petroleum drill rod |
| CN109182667A (en) * | 2018-11-13 | 2019-01-11 | 东莞市国森科精密工业有限公司 | A kind of method that 40CrNiMoA steel forgings grain size improves |
| CN111850430B (en) * | 2020-07-23 | 2021-08-06 | 杭州科技职业技术学院 | Composite material for LNG (liquefied natural gas) ultralow-temperature valve and preparation method of composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2355217A (en) * | 1999-10-15 | 2001-04-18 | Dexter Lawson Mfg Inc | Treatment of a paper drill bit |
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| US6105374A (en) * | 1998-07-28 | 2000-08-22 | Nu-Bit, Inc. | Process of nitriding metal-containing materials |
| WO2001068933A2 (en) * | 2000-03-14 | 2001-09-20 | The Timken Company | High performance carburizing stainless steel for high temperature use |
| CN101560591B (en) * | 2009-05-21 | 2013-07-31 | 上海市机械制造工艺研究所有限公司 | Composite temperature cold treatment process |
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| GB2355217A (en) * | 1999-10-15 | 2001-04-18 | Dexter Lawson Mfg Inc | Treatment of a paper drill bit |
Non-Patent Citations (3)
| Title |
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| 冷处理对合金结构钢力学性能的影响;葛凯晨 等;《热加工工艺》;20100831;第36卷(第16期);第149页-150页，表2 * |
| 李智超 等.低中碳合金结构钢深冷处理试验研究.《阜新矿业学院学报(自然科学版)》.1993,第12卷(第1期),第7页表1,第9页. * |
| 液氮深冷处理改善合金结构钢韧性的探讨;李智超 等;《阜新矿业学院学报》;19880930;第7卷(第3期);第73页，表2 * |
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