CN110387521A - A kind of carburizing heat treatment method that metal skin hardness is modified - Google Patents
A kind of carburizing heat treatment method that metal skin hardness is modified Download PDFInfo
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- CN110387521A CN110387521A CN201910535679.7A CN201910535679A CN110387521A CN 110387521 A CN110387521 A CN 110387521A CN 201910535679 A CN201910535679 A CN 201910535679A CN 110387521 A CN110387521 A CN 110387521A
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- temperature
- carburizing
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- carburizer
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Classifications
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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
- 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
- C23C8/08—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 only one element being applied
- C23C8/20—Carburising
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The present invention provides a kind of carburizing heat treatment method that metal skin hardness is modified, includes the following steps: S1: carrying out Anti-seeping technology to metal works；S2: metal works are placed in carburizer, are warming up to 930 DEG C, and carburizer is passed through in Xiang Suoshu carburizer and forms carburizing atmosphere, control carbon potential by depth of penetration；S3: the metal works after carburizing in S2 are cooled to 760 DEG C, keep the temperature 4 hours, and then be promoted to temperature to 830 DEG C, and keep the temperature 1 hour, and then be promoted to temperature to 900 DEG C, and keep the temperature 1 hour；S4: being cooled to 860 DEG C for the metal works after heating up in S3 again and keep the temperature 1 hour, and the oil liquid of 72 DEG C of merging cools down rapidly, is quenched；S5: quenched metal works are subjected to first time tempering in 520 DEG C of environment, heat preservation 2 hours, and then second is carried out in 230 DEG C of environment and is tempered, heat preservation 1 hour, and then it comes out of the stove and is air-cooled to room temperature, under the premise of the present invention improves workpiece surface hardness, so as to further improve the comprehensive mechanical property of workpiece.
Description
Technical field
The present invention relates to a kind of heat treatment method, the modified carburizing heat treatment method of especially a kind of metal skin hardness.
Background technique
Many metal parts in mechanical equipment are often needed for metal to adapt to the requirement of installation accuracy and intensity
Surface carries out carburizing heat treatment, to make it at work, the hardness on surface can the biggish load of support surface, and mesh
The preceding carburizing heat treatment method modified for metal skin hardness is general are as follows: carries out at case-carbonizing to low-carbon alloy steel first
Reason, after through high tempering, vehicle carbon-coating, destressing tempering is quenched again, though existing carburizing heat treatment method energy
Be effectively reduced the internal oxidition of metal surface, but further investigation show to have the disadvantage that after carburizing and quenching surface layer martensitic needles compared with
Coarse, residual austenite content is more, keeps its surface hardness relatively low, therefore will be greatly reduced its comprehensive mechanical property.
Therefore under the premise of being badly in need of a kind of raising workpiece surface hardness, so as to further improve the resultant force of workpiece
Learn the modified carburizing heat treatment method of the metal skin hardness of performance.
Summary of the invention
The present invention provides the following technical solutions:
A kind of carburizing heat treatment method that metal skin hardness is modified, includes the following steps:
S1: Anti-seeping technology is carried out after surface of workpiece cleaning, and to the surface of its non-working surface；
S2: by treated in S1, metal works are placed in carburizer, are warming up to 930 DEG C, are passed through in Xiang Suoshu carburizer
Carburizer forms carburizing atmosphere, controls carbon potential by depth of penetration, and control carbon potential CP is 1.1% first, and carburizing time is kept to exist
1.5 hours, be 0.8% in control carbon potential CP, and keep carburizing time at 1 hour；
S3: the metal works after carburizing in S2 are cooled to 760 DEG C, keep the temperature 4 hours, and then be promoted to temperature to 830
DEG C, and 1 hour is kept the temperature, and then be promoted to temperature to 900 DEG C, and keep the temperature 1 hour；
S4: the metal works after heating up in S3 are cooled to 860 DEG C again and keep the temperature 1 hour, the oil liquid of 72 DEG C of merging is rapid
It is cooling, it is quenched；
S5: quenched metal works are subjected to first time tempering in 520 DEG C of environment, keep the temperature 2 hours, and then 230
It carries out being tempered for second in DEG C environment, keeps the temperature 1 hour, and then come out of the stove and be air-cooled to room temperature.
Preferably, the carburizer is at least one of methanol, liquefied gas.
Preferably, the methanol that the carburizer is, the additional amount of the methanol are 3.6 ls/h.
The beneficial effects of the present invention are: the present invention and passes through control by being placed in carburizer to workpiece after Anti-seeping technology
Carburization Treatment under 1.1 ± 0.03% carbon potentials and 0.8 ± 0.03% carbon potential, so sequentially 760 ± 10 DEG C, 830 ± 3 DEG C,
Heat treatment operation before being quenched at a temperature of 900 ± 3 DEG C, 860 ± 10 DEG C, and after the completion of quenching, first carry out in 500-
It is high tempering in 520 DEG C of environment, and the relatively lonneal in 230-250 DEG C of environment, so as to guarantee surface acquisition
While therefore fine acicular martensite has high rigidity, quenching stress is reduced, quenching distortion is reduced, to improve the synthesis of workpiece
Mechanical property.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the hardness gradient curve graph using metal works difference infiltration layer after prior art heat treatment；
Fig. 2 is the hardness gradient curve graph of metal works difference infiltration layer in the present invention；
Fig. 3 is the metallograph using metal surface after prior art heat treatment；
Fig. 4 is the metallograph using metal surface after present invention heat treatment；
Label in figure: 1 is, 2 are, 3 are, 4 are, 5 are, 6 are, 7 are, 8 are, 9 are, 10 are, 11 are, 12 are, 13 are, 14
For, 15 are, 16 are, 17 are, 18 are, 19 are, 20 are, 21 are, 22 are, 23 are, 24 are, 25 are, 26 are, 27 are, 28 are, 29
For 30 are, 31 are, 32 are, 33 are, 34 are, 35 are, 36 are, 37 are, 38 are, 39 are.
Specific embodiment
A kind of carburizing heat treatment method that metal skin hardness is modified in conjunction with shown in Fig. 1 to Fig. 4, in the present embodiment,
Include the following steps:
S1: Anti-seeping technology is carried out after surface of workpiece cleaning, and to the surface of its non-working surface；
S2: by treated in S1, metal works are placed in carburizer, are warming up to 930 DEG C, are passed through in Xiang Suoshu carburizer
Carburizer forms carburizing atmosphere, controls carbon potential by depth of penetration, and control carbon potential CP is 1.1% first, and keeps the carburizing time
At 1.5 hours, then controlling carbon potential CP was 0.8%, and keeps carburizing time at 1 hour；
S3: the metal works after carburizing in S2 are cooled to 760 DEG C, keep the temperature 4 hours, and then be promoted to temperature to 830
DEG C, and 1 hour is kept the temperature, and then be promoted to temperature to 900 DEG C, and keep the temperature 1 hour；
S4: the metal works after heating up in S3 are cooled to 860 DEG C again and keep the temperature 1 hour, the oil liquid of 72 DEG C of merging is rapid
It is cooling, it is quenched；
S5: quenched metal works are subjected to first time tempering in 520 DEG C of environment, keep the temperature 2 hours, and then 230
It carries out being tempered for second in DEG C environment, keeps the temperature 1 hour, and then come out of the stove and be air-cooled to room temperature.
The carburizer is at least one of methanol, liquefied gas.
The methanol that the carburizer is, the additional amount of the methanol are 3.6 ls/h.
The beneficial effects of the present invention are: the present invention and passes through control by being placed in carburizer to workpiece after Anti-seeping technology
Carburization Treatment under 1.1 ± 0.03% carbon potentials and 0.8 ± 0.03% carbon potential, so sequentially 760 ± 10 DEG C, 830 ± 3 DEG C,
Heat treatment operation before being quenched at a temperature of 900 ± 3 DEG C, 860 ± 10 DEG C, and after the completion of quenching, first carry out in 500-
It is high tempering in 520 DEG C of environment, and the relatively lonneal in 230-250 DEG C of environment, so as to guarantee surface acquisition
While therefore fine acicular martensite has high rigidity, quenching stress is reduced, quenching distortion is reduced, to improve the synthesis of workpiece
Mechanical property
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of modified carburizing heat treatment method of metal skin hardness, which comprises the steps of:
S1: Anti-seeping technology is carried out after surface of workpiece cleaning, and to the surface of its non-working surface；
S2: by treated in S1, metal works are placed in carburizer, are warming up to 930 DEG C, are passed through carburizing in Xiang Suoshu carburizer
Dosage form controls carbon potential at carburizing atmosphere, by depth of penetration, and control carbon potential CP is 1.1% first, and keeps the carburizing time 1.5
Hour, then controlling carbon potential CP is 0.8%, and keeps the carburizing time at 1 hour；
S3: being cooled to 760 DEG C for the metal works after carburizing in S2, keep the temperature 4 hours, and then be promoted to temperature to 830 DEG C, and
Heat preservation 1 hour, and then temperature is being promoted to 900 DEG C, and keeps the temperature 1 hour；
S4: being cooled to 860 DEG C for the metal works after heating up in S3 again and keep the temperature 1 hour, and the oil liquid of 72 DEG C of merging cools down rapidly,
It is quenched；
S5: quenched metal works are subjected to first time tempering in 520 DEG C of environment, keep the temperature 2 hours, and then in 230 DEG C of rings
It carries out being tempered for second in border, keeps the temperature 1 hour, and then come out of the stove and be air-cooled to room temperature.
2. a kind of modified carburizing heat treatment method of metal skin hardness according to claim 1, which is characterized in that described
Carburizer is at least one of methanol, liquefied gas.
3. a kind of modified carburizing heat treatment method of metal skin hardness according to claim 2, which is characterized in that described
The methanol that carburizer is, the additional amount of the methanol are 3.6 ls/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535679.7A CN110387521A (en) | 2019-06-20 | 2019-06-20 | A kind of carburizing heat treatment method that metal skin hardness is modified |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535679.7A CN110387521A (en) | 2019-06-20 | 2019-06-20 | A kind of carburizing heat treatment method that metal skin hardness is modified |
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| CN110387521A true CN110387521A (en) | 2019-10-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005066383A1 (en) * | 2003-12-22 | 2005-07-21 | Caterpillar Inc. | Method for carburizing a steel article and steel article thus obtained with improved wear resistance |
| CN104711401A (en) * | 2015-02-09 | 2015-06-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for large heavy-duty gear |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN108277449A (en) * | 2018-02-24 | 2018-07-13 | 湖南特科能热处理有限公司 | A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece |
| CN108866300A (en) * | 2018-07-23 | 2018-11-23 | 台州市众达热处理有限公司 | A kind of heat treatment process of quartering hammer |
| CN109183045A (en) * | 2018-09-19 | 2019-01-11 | 温岭市大山热处理厂（普通合伙） | A kind of heat treatment process of vehicle spindle |
| CN109321868A (en) * | 2018-12-07 | 2019-02-12 | 徐贲 | A kind of heat treatment process of high abrasion round-link chain |
-
2019
- 2019-06-20 CN CN201910535679.7A patent/CN110387521A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005066383A1 (en) * | 2003-12-22 | 2005-07-21 | Caterpillar Inc. | Method for carburizing a steel article and steel article thus obtained with improved wear resistance |
| CN104711401A (en) * | 2015-02-09 | 2015-06-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for large heavy-duty gear |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN108277449A (en) * | 2018-02-24 | 2018-07-13 | 湖南特科能热处理有限公司 | A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece |
| CN108866300A (en) * | 2018-07-23 | 2018-11-23 | 台州市众达热处理有限公司 | A kind of heat treatment process of quartering hammer |
| CN109183045A (en) * | 2018-09-19 | 2019-01-11 | 温岭市大山热处理厂（普通合伙） | A kind of heat treatment process of vehicle spindle |
| CN109321868A (en) * | 2018-12-07 | 2019-02-12 | 徐贲 | A kind of heat treatment process of high abrasion round-link chain |
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Application publication date: 20191029 |