CN109112469A - A kind of connector heat treatment process of 42CrMo material - Google Patents
A kind of connector heat treatment process of 42CrMo material Download PDFInfo
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- CN109112469A CN109112469A CN201811097220.5A CN201811097220A CN109112469A CN 109112469 A CN109112469 A CN 109112469A CN 201811097220 A CN201811097220 A CN 201811097220A CN 109112469 A CN109112469 A CN 109112469A
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- connector
- temperature
- heat treatment
- treatment process
- heating furnace
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Classifications
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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
- C23C8/08—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
- C23C8/22—Carburising of ferrous surfaces
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D2211/003—Cementite
-
- 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
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of connector heat treatment process of 42CrMo material, are related to heat treatment process field.The technique mainly includes heating period, 900-920 DEG C of carbon impregnation stage, 100-120 DEG C of fractionated oil cooling stage and 410-430 DEG C of high tempering stage, and wherein carbon impregnation stage includes strong infiltration, diffusion and holding stage.The present invention has the following advantages and effects: by the way that the prolonged strong diffusion phase for seeping stage and high temperature is arranged, the harden ability of connector is improved, its tension and anti-pressure ability are improved, has achieved the effect that high service life.Simultaneously using the cooling internal stress reduced inside connector of fractionated oil, its deformation and cracking are prevented；By adding holding stage after diffusion phase, avoid connector that decarburization phenomenon occurs.Tempering rope is obtained further through high tempering and bends body tissue, is improved the comprehensive mechanical property of connector, is further improved the service life of connector.
Description
Technical field
The present invention relates to heat treatment process field, in particular to a kind of connector heat treatment process of 42CrMo material.
Background technique
In material processing and equipment manufacture field, heat treatment, which is that one kind is common, carries out at reinforcing material surface and equipment
Reason, is allowed to a kind of technique for having various superperformances, wherein can increase substantially the rigidity, hard of workpiece by heat treatment
Degree, wearability, fatigue strength and toughness etc., to meet the different requirements of various machine components and tool.
Fixation is usually attached using connector between two section compartments of train, is buffered when connector is Train brake
Component, when work, will bear great impact force, therefore be easy to cause its harden ability poor using traditional heat treatment method, into
And the service life of connector is considerably reduced, have much room for improvement.
Summary of the invention
The object of the present invention is to provide a kind of connector heat treatment process of 42CrMo material, with high service life
Effect.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of connection of 42CrMo material
Head heat treatment process, includes the following steps:
S1: connector is placed in heating furnace by heating by heating furnace continuous heating to after 900-920 DEG C, keeps the temperature 30-
40min；
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature 390-410min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keeps the temperature 190-210min；
S3: it is cooling, connector is taken out out of heating furnace, it is cold to carry out fractionated oil to connector using 100-120 DEG C of oil
But, 25-35min cooling time；
S4: connector after heating furnace is cooled to 410-430 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering.
By using above-mentioned technical proposal, rank is seeped by force by 900-920 DEG C of high temperature and the long-time of 390-410min
Section improves the carburizing effect of connection head surface.Make connector start to spread by 900-920 DEG C of high temperature again, improves connection
The carburizing effect of head heart, and then ensure that the surface hardness of connector and centre hardness reach hardness requirement, improve connection
The harden ability of head, improves the service life of connector, has achieved the effect that high service life.Subtracted simultaneously using fractionated oil cooling
Internal stress inside few connector prevents it from deforming and cracking, and further through setting high tempering, obtains ferrite and acinous
The mixture of cementite, i.e. tempered sorbite tissue, because tempered sorbite tissue has excellent comprehensive mechanical property,
The tension and anti-pressure ability for further increasing connector, further improve the service life of connector.
The further setting of the present invention are as follows: step S2 further includes following steps:
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min to 830-850 DEG C.
By using above-mentioned technical proposal, by the way that holding stage is arranged, so that the carbon penetrated into connector is fixed, improve
The stability of carburizing, and then avoid it that decarburization phenomenon occurs and influence the service life of connector, further reach high use
The effect in service life.
The further setting of the present invention are as follows: in step S3, fractionated oil is mixed with the stirring frequency of 50HZ.
By using above-mentioned technical proposal, power frequency heat hardening is carried out to connector using the stirring frequency of 50HZ, reduces connection
The deformation quantity of head surface reduces its decarburized amount, and connector surface hardness, and impact flexibility, fatigue strength is greatly improved
And wearability etc. improves a lot, and improves the service life of connector.
The further setting of the present invention are as follows: the carbon potential CP in step S21 is 1.1 ± 0.05, and the carbon potential CP in step S22 is
Carbon potential CP in 0.8 ± 0.05, step S23 is 0.8 ± 0.05.
By using above-mentioned technical proposal, because the excessively high phosphorus content that will lead to connector of carbon potential increases, phosphorus content increases
There is carbon black in the surface that will lead to connector, so that connector is more crisp, i.e., connector is easy to happen fracture or damage.Carbon potential is too low
The phosphorus content that will lead to connector reduces, and then reduces the bearing capacity of connection head surface, reduces the service life of connector.Cause
This makes the carbon potential CP of the carbon impregnation stage of connector be 1.1 ± 0.05,0.8 ± 0.05 and 0.8 by 900-920 DEG C of high temperature
± 0.05, so that the phosphorus content of connector reaches requirement just, the longevity is used after further increasing connector heat treatment
Life.
The further setting of the present invention are as follows: the heating temperature in step S21 is 910 DEG C, soaking time 400min.
By using above-mentioned technical proposal, because the temperature and soaking time in infiltration stage are the main of influence carbon potential by force
Factor, the excessively high phosphorus content that will lead to connector of temperature and time increase, so that connector is more crisp, and then reduce making for connector
Use the service life.The too low phosphorus content that will will lead to connector of temperature and time is not up to standard, while the carburizing that will lead to connector is uneven
It is even, the hardness of connection head surface is thereby reduced, the service life of connector can be equally reduced.Therefore the heating of 910 DEG C of setting
The soaking time of temperature and 400min, so that the phosphorus content for connecting head surface reaches hardness standard, and then avoids under the state
Connector after heat treatment is excessively crisp or excessively soft, the effective service life for increasing connector.
The further setting of the present invention are as follows: the heating temperature in step S22 is 910 DEG C, soaking time 200min.
By using above-mentioned technical proposal, because workpiece surface concentration of carbon is higher at this time, and transition after the too strong infiltration stage
Area is narrow, and the concentration gradient of carbon is very big, therefore reduces case carbon using diffusion phase, expands carburized (case) depth, makes transition
Gentle process is presented in area.And then by 910 DEG C of setting of heating temperature and the soaking time of 200min, so that under the state,
After connection head surface starts diffusion, the carbon potential on most surface layer is 0.8 or so, and the carbon potential on secondary surface layer is 0.9-1.0 or so, and by secondary
The carbon potential of surface layer to core gradually decreases, and is finally down to the phosphorus content of core.So that the phosphorus content of each position of connector
Can achieve hardness standard, so avoid heat treatment after connector there is carbide deformation occurs or fracture, and then effectively
The service life for improving connector.
The further setting of the present invention are as follows: the heating temperature in step S23 is 840 DEG C, soaking time 30min.
By using above-mentioned technical proposal, because the heating temperature of connector is excessively high or the residence time is too long at high temperature
When, it is easy to happen decarburization phenomenon, therefore heating temperature and soaking time are to influence the principal element of connector decarburization, connector
Decarburization is easy to make the phosphorus content on its surface layer to reduce, and martensite transfor mation cannot occur inside it, or transformation is not exclusively, is easy to lead
It cannot get required hardness after cause processing.Therefore the heating temperature of 840 DEG C of setting and the soaking time of 30min, so that should
Under state, the generation of connector decarburization phenomenon is reduced or prevents, and then increase the service life of connector.
The further setting of the present invention are as follows: in step S21 and step S22, remain temperature-resistant, continue to lead into heating furnace
Enter cerium oxide powder, and intake is 0.1g/min.
By using above-mentioned technical proposal, because being cracked under methanol high temperature in carbon impregnation stage, and the cracking of methanol
It is the fracture of 0-H key first, then generates methoxy intermediate, and methanol decomposition will pass through the methoxy being adsorbed at CO and H2
The process of the gradually dehydrogenation of base.Again because ceria can promote 0-H key to be broken, using ceria as methanol
The catalyst of cracking process significantly accelerates the rate of cleavage of methanol, improves the carburizing speed of connector, improves life
Efficiency is produced, while avoiding connector that decarburization phenomenon occurs, improves its service life.
In conclusion the invention has the following advantages:
1. improving the harden ability of connector by the prolonged strong diffusion phase for seeping stage and high temperature of setting, improving
Its tension and anti-pressure ability have achieved the effect that high service life, while using interior inside the cooling reduction connector of fractionated oil
Stress prevents it from deforming and cracking, obtains tempered sorbite tissue further through high tempering, improve the synthesis mechanical property of connector
Can, further improve the service life of connector；
2. avoiding connector that decarburization phenomenon, the company of further improving occurs by adding holding stage after diffusion phase
The service life of connector；
3. the catalyst by using ceria as methanol decomposition process significantly accelerates the cracking speed of methanol
Degree, improves the carburizing speed of connector, while avoiding connector that decarburization phenomenon occurs, and improves its service life.
Specific embodiment
A kind of connector heat treatment process of 42CrMo material, includes the following steps:
S1: connector is placed in heating furnace by heating by heating furnace continuous heating to after 900-920 DEG C, keeps the temperature 30-
40min；
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature
390-410min, wherein heating temperature is preferably 910 DEG C, and soaking time is preferably 400min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature
190-210min, wherein heating temperature is preferably 910 DEG C, and soaking time is preferably 200min；
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min, wherein heating temperature is excellent to 830-850 DEG C
840 DEG C are selected as, soaking time is preferably 30min；
Connector is seeped by force by the long-time of 910 DEG C of high temperature and 400min, improves the infiltration of connection head surface
Carbon effect.Make connector start to spread by 900-920 DEG C of high temperature again, improves the carburizing effect of connector heart.Lead to again
Holding stage is crossed, so that the carbon penetrated into connector is fixed, avoids it that decarburization phenomenon occurs, and then effectively raise connection
The harden ability of head improves it treated toughness and tension resistance ability, improves the service life of connector, reached height
The effect of service life；
It wherein in step S21 and step S22, remains temperature-resistant, continues to be passed through cerium oxide powder into heating furnace, and
Intake is 0.1g/min；
Because being cracked under methanol high temperature in carbon impregnation stage, and the cracking of methanol is the fracture of 0-H key first, then
Methoxy intermediate is generated, and methanol decomposition will be by the process of the gradually dehydrogenation for the methoxyl group being adsorbed at CO and H2.Again
Because ceria can promote 0-H key to be broken, when carrying out heat treatment operation to workpiece, powder electrostatic gun is utilized
Cerium oxide powder is sprayed into heating furnace, the catalyst using ceria as methanol decomposition process is significantly accelerated
The rate of cleavage of methanol, improves the carburizing speed of connector, improves production efficiency, while avoiding connector that decarburization occurs
Phenomenon improves its service life；
Wherein the carbon potential CP in step S21 is 1.1 ± 0.05, and the carbon potential CP in step S22 is 0.8 ± 0.05, step S23
In carbon potential CP be 0.8 ± 0.05；
Because the excessively high phosphorus content that will lead to connector of carbon potential increases, the surface that phosphorus content increase will lead to connector occurs
Carbon black, so that connector is more crisp, i.e., connector is easy to happen fracture or damage.The too low phosphorus content drop that will lead to connector of carbon potential
It is low, and then the bearing capacity of connection head surface is reduced, reduce the service life of connector.Therefore pass through 900-920 DEG C of high temperature
So that the carbon potential CP of the carbon impregnation stage of connector is 1.1 ± 0.05,0.8 ± 0.05 and 0.8 ± 0.05, so that connector
Phosphorus content reach requirement just, further increase connector heat treatment after service life；
S3: it is cooling, connector is taken out out of heating furnace, using the stirring frequency pair of 100-120 DEG C of oil and 50HZ
It is cooling that connector carries out fractionated oil, cooling time 25-35min；
The cooling internal stress reduced inside connector of fractionated oil simultaneously prevents it from deforming and cracking, while using 50HZ's
Stirring frequency carries out power frequency heat hardening to connector, reduces the deformation quantity of connection head surface, reduces its decarburized amount, be greatly improved
Connector surface hardness, and the impact flexibility of connector, fatigue strength and wearability etc. improve a lot, and then improve
The service life of connector；
S4: connector after heating furnace is cooled to 410-430 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering；
The mixture of ferrite and particulate globular cementite, i.e. secondary troostite tissue are obtained by an average tempering,
Because secondary troostite tissue has excellent comprehensive mechanical property, the tension and resistance to compression energy of connector are further increased
Power improves the service life of connector.
| Project | Embodiment |
| Surface hardness | 45-52HRC |
| Centre hardness | 32-38HRC |
| Case depth | More than 1.02mm |
| Testing inspection service life | 10000 times or more |
Specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
It can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as in this hair
All by the protection of Patent Law in bright scope of the claims.
Claims (8)
1. a kind of connector heat treatment process of 42CrMo material, characterized by the following steps:
S1: connector is placed in heating furnace by heating by heating furnace continuous heating to after 900-920 DEG C, keeps the temperature 30-
40min；
S2: carburizing includes the following steps:
S21: it is strong to seep, it remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keep the temperature 390-410min；
S22: diffusion remains temperature-resistant, continues to be passed through methanol and propane into heating furnace, keeps the temperature 190-210min；
S3: it is cooling, connector is taken out out of heating furnace, fractionated oil cooling is carried out to connector using 100-120 DEG C of oil, it is cold
But the time is 25-35min；
S4: connector after heating furnace is cooled to 410-430 DEG C, is put into heating furnace, keeps the temperature 170-190min by tempering.
2. a kind of connector heat treatment process of 42CrMo material according to claim 1, it is characterised in that: step S2
Further include following steps:
S23: heat preservation, continued down remain temperature-resistant, keep the temperature 25-35min to 830-850 DEG C.
3. a kind of connector heat treatment process of 42CrMo material according to claim 2, it is characterised in that: step S3
In, fractionated oil is stirred with the stirring frequency of 50HZ.
4. a kind of connector heat treatment process of 42CrMo material according to claim 3, it is characterised in that: step
Carbon potential CP in S21 is 1.1 ± 0.05, and the carbon potential CP in step S22 is 0.8 ± 0.05, and the carbon potential CP in step S23 is 0.8
±0.05。
5. a kind of connector heat treatment process of 42CrMo material according to claim 4, it is characterised in that: step
Heating temperature in S21 is 910 DEG C, soaking time 400min.
6. a kind of connector heat treatment process of 42CrMo material according to claim 5, it is characterised in that: step
Heating temperature in S22 is 910 DEG C, soaking time 200min.
7. a kind of connector heat treatment process of 42CrMo material according to claim 6: it is characterized by: step
Heating temperature in S23 is 840 DEG C, soaking time 30min.
8. a kind of connector heat treatment process of 42CrMo material according to claim 1, it is characterised in that: step
It in S21 and step S22, remains temperature-resistant, continues to be passed through cerium oxide powder into heating furnace, and intake is 0.1g/
min。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811097220.5A CN109112469A (en) | 2018-09-19 | 2018-09-19 | A kind of connector heat treatment process of 42CrMo material |
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| CN201811097220.5A CN109112469A (en) | 2018-09-19 | 2018-09-19 | A kind of connector heat treatment process of 42CrMo material |
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| CN109112469A true CN109112469A (en) | 2019-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113330126A (en) * | 2019-01-25 | 2021-08-31 | 古河凿岩机械有限公司 | Drilling tool and method for manufacturing same |
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2018
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|---|---|---|---|---|
| JPH08189314A (en) * | 1995-01-11 | 1996-07-23 | Mitsui Mining & Smelting Co Ltd | Catalyst for engine valve |
| CN105586599A (en) * | 2014-11-14 | 2016-05-18 | 重庆春顾机械制造有限公司 | Thermal treatment method for carburizing and quenching of gearbox gears |
| CN105543770A (en) * | 2015-12-22 | 2016-05-04 | 湖北鄂瑞孚截齿钻具科技有限公司 | Surface treatment technique for cutting pick |
| CN108531851A (en) * | 2018-04-27 | 2018-09-14 | 宁夏石炭井炭化实业公司 | A kind of heat treatment process of shallow-tank separator sprocket wheel |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113330126A (en) * | 2019-01-25 | 2021-08-31 | 古河凿岩机械有限公司 | Drilling tool and method for manufacturing same |
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Application publication date: 20190101 |