CN115261775A - Heat-preservation quenching heat treatment process after carbonitriding - Google Patents
Heat-preservation quenching heat treatment process after carbonitriding Download PDFInfo
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- CN115261775A CN115261775A CN202210780098.1A CN202210780098A CN115261775A CN 115261775 A CN115261775 A CN 115261775A CN 202210780098 A CN202210780098 A CN 202210780098A CN 115261775 A CN115261775 A CN 115261775A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Abstract
The invention discloses a heat preservation quenching heat treatment process after carbonitriding, which comprises the following steps: step one, heating the product to 800-1000 ℃, preserving heat for 30min to ensure that the product tissue is completely transformed into austenite, and then introducing LNG and NH3Carbonitriding the product; step two, the product adopts a two-stage type co-cementation method, the carburization stage CP is set to be 1.5, and the time is 2 hours; the diffusion phase CP is set to be 0.5, and the time is 1h; step three, after the co-permeation stage is completed, cooling the product to 750-790 ℃ and keeping for 40min; transferring the product into quenching oil for oil quenching, wherein the oil quenching temperature is 100-120 ℃; and fifthly, tempering the cooled product.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to a heat-preservation quenching heat treatment process after carbonitriding.
Background
Carbonitriding is a chemical surface heat treatment process for simultaneously permeating carbon and nitrogen into the surface of a steel part, and can enhance the wear resistance and hardness of the part and simultaneously has good toughness. At present, the control difficulty is high aiming at the carburization depth with poor manufacturability of 20 steel, so that the strength of parts cannot meet the set requirement.
Disclosure of Invention
In order to solve the problems in the related art, the application provides a heat-preservation quenching heat treatment process after carbonitriding, which can effectively improve the uniformity and hardness of carburization depth.
The technical scheme is as follows:
a heat-preservation quenching heat treatment process after carbonitriding comprises the following steps:
step one, heating the product to 800-1000 ℃, and introducing LNG and NH after the product structure begins to transform into austenite3Carbonitriding the product;
step two, the product adopts a two-stage type co-cementation method, the carburization stage CP is set to be 1.5, and the time is 2 hours; the diffusion phase CP is set to be 0.5, and the time is 1h;
step three, after the co-permeation stage is finished, cooling the product to 750-790 ℃ for 40min;
transferring the product into quenching oil for oil quenching, wherein the oil quenching temperature is 100-120 ℃;
and fifthly, tempering the cooled product.
Further, in the first step, the product is cleaned by a vacuum cleaning machine before being heated, and engine oil on the surface of the product is removed.
Further, in the second step, the LNG flow rate in the two stages is 15-25L/min.
Further, in the second step, NH in two stages3The flow rate is 6-7.5L/min.
Further, in the third step, the temperature range of the product is 770 +/-5 ℃.
Further, after the product is subjected to oil quenching treatment, cleaning the product by a vacuum cleaning machine to remove quenching oil on the surface of the product, wherein the surface hardness of the product subjected to the oil quenching treatment is at least 63HRC, the hardening depth is 0.2-0.3mm, and the product beyond the numerical range is judged as an unqualified product.
Further, in the fourth step, the product after oil quenching treatment is naturally cooled in the air after quenching oil on the surface is removed, and is subjected to deep cooling after being cooled to room temperature, wherein the deep cooling temperature is-80 ℃, the heat preservation time is 30min, and residual austenite generated during quenching is removed.
Further, in the fifth step, the temperature of the product is raised to 190 ℃, then the temperature is kept for 1.5h, the residual stress after quenching is removed, the surface hardness of the final product is greater than 61HRC, the core hardness is 145-155HV, the surface martensite is 1-2 grade, and the residual austenite is 1-2 grade, thus obtaining a qualified product.
Further, in the first step to the fifth step, RX protective gas is introduced in the whole process.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Detailed Description
A heat-preservation quenching heat treatment process after carbonitriding comprises the following steps:
step one, heating the product to 800-1000 ℃, and introducing LNG and NH after the product structure begins to transform into austenite3Carbonitriding the product;
austenitizing the product structure, and introducing LNG (liquefied natural gas) and NH3(ammonia gas) to cause its carbon and nitrogen to permeate the product; before carbonitriding heat treatment of a product, quenching and tempering are needed to be carried out firstly, the product is heated to a set temperature and is kept for a certain time, so that the product is uniform in structure, internal stress is fully reduced, deformation caused by stress is reduced, and uniform carbonitriding is facilitated.
Step two, the product adopts a two-stage type co-cementation method, the carburization stage CP is set to be 1.5, and the time is 2 hours; the diffusion phase CP is set to be 0.5, and the time is 1h;
the time ratio of the two stages can be controlled to be 2.
Step three, after the co-permeation stage is completed, cooling the product to 750-790 ℃ and keeping for 40min;
in the heat preservation process in the step, the temperature is lower than the co-cementation temperature, so that the temperature difference between the product temperature and the oil temperature is reduced, the required hardness can be achieved after quenching, the deformation amount of the size can be reduced, and the final tempering treatment effect can be further improved.
Step four, transferring the product into quenching oil for oil quenching, wherein the oil quenching temperature is 100-120 ℃;
after the product is insulated, the product is quickly moved into quenching oil, and a stirrer is started to stir the quenching oil, so that the cooling speed of the product is accelerated, and the hardness is improved, wherein the stirrer is a medium-speed stirrer, and the quenching oil is high-temperature oil.
And fifthly, tempering the cooled product.
The quenched product needs to be tempered within 4h, the tempering is to perform heat preservation on the product for 1.5h at 190 ℃, residual stress generated after quenching is eliminated, and the depth of the carbonitrided layer can be controlled by controlling the heat preservation time, so that the surface of the product has enough hardness on the premise of ensuring enough toughness.
In this embodiment, in the first step, the product is cleaned by a vacuum cleaner before being heated, and the engine oil on the surface of the product is removed.
In this embodiment, in the second step, the LNG flow rate in the two stages is 15-25L/min.
In this embodiment, in the second step, NH in two stages3The flow rate is 6-7.5L/min.
In this example, in the third step, the temperature range of the product is 770 ± 5 ℃.
In the embodiment, after the product is subjected to oil quenching treatment, the product is cleaned by a vacuum cleaning machine to remove quenching oil on the surface of the product, wherein the surface hardness of the product subjected to the oil quenching treatment is at least 63HRC, the hardening depth is 0.2-0.3mm, and the product exceeding the numerical range is judged as an unqualified product.
In the embodiment, in the fourth step, the product subjected to oil quenching treatment is naturally cooled in the air after quenching oil on the surface is removed, and is subjected to deep cooling after being cooled to room temperature, wherein the deep cooling temperature is-80 ℃, the temperature is kept for 30min, and residual austenite generated during quenching is removed.
The ice-cooling treatment time can be controlled within 2-3h, and the residual austenite structure on the surface of the product can be effectively reduced.
In the fifth step, the temperature of the product is raised to 190 ℃ and then is kept for 1.5h, the residual stress after quenching is removed, the surface hardness of the final product is greater than 61HRC, the core hardness is 145-155HV, the surface martensite is 1-2 grade, and the residual austenite is 1-2 grade, so that the product is qualified.
Tempering is used for adjusting the surface hardness of the product and removing residual stress.
In this embodiment, RX shielding gas is introduced during the whole process from the first step to the fifth step. The RX protective gas is obtained by reacting air and LNG at high temperature in a furnace under nickel catalyst reaction, and certain basic carbon potential is obtained in the furnace by introducing the RX protective gas, so that the carbon potential control range in the carburizing process is reduced and is more stable.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (9)
1. A heat preservation quenching heat treatment process after carbonitriding is characterized by comprising the following steps:
step one, heating the product to 800-1000 ℃, and introducing LNG and NH after the product structure begins to transform into austenite3Carbonitriding the product;
step two, the product adopts a two-stage type co-cementation method, the carburization stage CP is set to be 1.5, and the time is 2 hours; the diffusion phase CP is set to be 0.5, and the time is 1h;
step three, after the co-permeation stage is finished, cooling the product to 750-790 ℃ for 40min;
transferring the product into quenching oil for oil quenching, wherein the oil quenching temperature is 100-120 ℃;
and fifthly, tempering the cooled product.
2. The heat treatment process for heat preservation and quenching after carbonitriding according to claim 1, wherein in the first step, the product is cleaned by a vacuum cleaner before being heated, and engine oil on the surface of the product is removed.
3. The heat-preservation quenching heat treatment process after carbonitriding according to claim 1, wherein in the second step, the LNG flow rate in the two stages is 15 to 25L/min.
4. The process of claim 1, wherein in step two, NH is present in two stages3The flow rate is 6-7.5L/min.
5. The heat treatment process for heat preservation and quenching after carbonitriding according to claim 1, wherein in the third step, the heat preservation temperature range of the product is 770 ± 5 ℃.
6. The carbonitriding post-soaking heat treatment process according to claim 1, wherein in the fourth step, the product is subjected to oil quenching and then cleaned by a vacuum cleaner to remove quenching oil from the surface of the product, wherein the hardness of the surface of the product subjected to oil quenching is at least 63HRC, the hardening depth is 0.2 to 0.3mm, and products outside the above range are determined as defective products.
7. The heat-preservation quenching heat treatment process after carbonitriding according to claim 1, wherein in the fourth step, the product after oil quenching is finished is naturally cooled in air after quenching oil on the surface is removed, and is cryogenically cooled at a cryogenic temperature of-80 ℃ after being cooled to room temperature, the temperature is preserved for 30min, and residual austenite is generated during quenching removal.
8. The heat-preservation quenching heat treatment process after carbonitriding according to claim 1, wherein in the fifth step, the product is heated to 190 ℃ and then is subjected to heat preservation for 1.5h, residual stress after quenching is removed, the surface hardness of the final product is greater than 61HRC, the core hardness is 145-155HV, the surface martensite is 1-2 grade, and the residual austenite is 1-2 grade, thus obtaining a qualified product.
9. The heat-preservation quenching heat treatment process after carbonitriding according to claim 1, characterized in that RX shielding gas is introduced in the whole process from the first step to the fifth step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210780098.1A CN115261775B (en) | 2022-07-04 | 2022-07-04 | Thermal treatment process for thermal insulation quenching after carbonitriding |
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| CN202210780098.1A CN115261775B (en) | 2022-07-04 | 2022-07-04 | Thermal treatment process for thermal insulation quenching after carbonitriding |
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| CN115261775A true CN115261775A (en) | 2022-11-01 |
| CN115261775B CN115261775B (en) | 2023-09-19 |
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| JP2002030338A (en) * | 2000-05-12 | 2002-01-31 | Nakamura Seisakusho:Kk | High concentration carburizing and quenching method of steel, and high concentration carburizing and quenching parts |
| US20110284133A1 (en) * | 2008-12-02 | 2011-11-24 | Honda Motor Co., Ltd. | Carbonitrided part and process for producing carbonitrided part |
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| CN105238912A (en) * | 2015-11-17 | 2016-01-13 | 中国重汽集团济南动力有限公司 | Heating treatment technology for piston pin |
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| CN110760787A (en) * | 2019-12-05 | 2020-02-07 | 山东建筑大学 | Composite heat treatment strengthening method for lower swing arm of automobile suspension |
| CN110846612A (en) * | 2019-12-03 | 2020-02-28 | 上海丰东热处理工程有限公司 | Vacuum carburizing heat treatment processing technology |
| CN112522714A (en) * | 2020-11-17 | 2021-03-19 | 重庆大学 | Heat treatment method and application of 20CrNi2Mo steel |
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2022
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002030338A (en) * | 2000-05-12 | 2002-01-31 | Nakamura Seisakusho:Kk | High concentration carburizing and quenching method of steel, and high concentration carburizing and quenching parts |
| US20110284133A1 (en) * | 2008-12-02 | 2011-11-24 | Honda Motor Co., Ltd. | Carbonitrided part and process for producing carbonitrided part |
| CN102534465A (en) * | 2012-02-02 | 2012-07-04 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
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| CN105238912A (en) * | 2015-11-17 | 2016-01-13 | 中国重汽集团济南动力有限公司 | Heating treatment technology for piston pin |
| CN106756753A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of low-speed heavy-loaded gear |
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| CN110846612A (en) * | 2019-12-03 | 2020-02-28 | 上海丰东热处理工程有限公司 | Vacuum carburizing heat treatment processing technology |
| CN110760787A (en) * | 2019-12-05 | 2020-02-07 | 山东建筑大学 | Composite heat treatment strengthening method for lower swing arm of automobile suspension |
| CN112522714A (en) * | 2020-11-17 | 2021-03-19 | 重庆大学 | Heat treatment method and application of 20CrNi2Mo steel |
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| CN115261775B (en) | 2023-09-19 |
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Address after: 214000 no.6-8, 6-9, Changhui Road, Huishan District, Wuxi City, Jiangsu Province Applicant after: Dongyu Dong'an (Wuxi) Technology Co.,Ltd. Address before: 214000 no.6-8, 6-9, Changhui Road, Huishan District, Wuxi City, Jiangsu Province Applicant before: Dong an East (Wuxi) heat treatment Co.,Ltd. |
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