CN102899603A - M50NiL material low-pressure vacuum carburization method - Google Patents
M50NiL material low-pressure vacuum carburization method Download PDFInfo
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- CN102899603A CN102899603A CN2012104096150A CN201210409615A CN102899603A CN 102899603 A CN102899603 A CN 102899603A CN 2012104096150 A CN2012104096150 A CN 2012104096150A CN 201210409615 A CN201210409615 A CN 201210409615A CN 102899603 A CN102899603 A CN 102899603A
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Abstract
The invention relates to an M50NiL material low-pressure vacuum carburization method. Through the setting of a carburization process and carburization parameters, the carburization of a second generation gear steel M50NiL material is realized; and after carburization, the surface hardness is up to HRC61-65, the center hardness is up to HRC40-48, the residual austenite is less than 10%, and the surface microstructure and the center microstructure conform to corresponding requirements of aviation standard 5492.
Description
Technical field
The present invention relates to a kind of method for carburizing, especially M50NiL material low-pressure vacuum carburization method.
Background technology
The M50NiL material is the s-generation Pinion Steel that aviation field uses, and its properties is better than first-generation Pinion Steel 9310 steel, for the domestic technique that does not have maturation of M50NiL material.External the beginning is applied on the advanced engine, and the performance after its carburizing is better than 9310 steel, and its fatigue property is higher than 9310 steel more than 10 times, and contact fatigue property also is higher than 9,310 tens times, and domestic development for this material just just begins.The technical indicator of specifically wanting after the part carburizing to reach is: case depth is more than 1.1mm; Carburizing rear surface hardness HRC61～65, centre hardness HRC40～48; Surface microhardness is martensite+a small amount of carbide, core structure is low carbon martensite+a small amount of ferrite, residual austenite is less than 10%, and the microstructure of the surface microhardness of material and heart section meets the heat treating method of the corresponding requirements of navigation mark 5492 " carburizing of aviation steelwork, carbonitriding microstructure examination standard ".The heat treatment mode that this material is general is difficult to reach These parameters, the domestic technology that does not still have moulding.
Summary of the invention
The purpose of this invention is to provide a kind of M50NiL material that can make and can carry out carburizing, case depth more than 1.1mm, carburizing rear surface hardness HRC61～65, centre hardness HRC40～48; Surface microhardness is martensite+a small amount of carbide, core structure is low carbon martensite+a small amount of ferrite, residual austenite is less than 10%, and the surface microhardness of assurance material and the microstructure of heart section meet the heat treating method of the corresponding requirements of navigation mark 5492 " carburizing of aviation steelwork, carbonitriding microstructure examination standard ".Operational path of the present invention is:
1 prepares the M50NiL material parts;
2 are placed into part and carry out low-pressure vacuum carburization in the low-pressure carburization stove, the carburizing atmosphere that adopts is acetylene, carburizing temperature is 980 ± 10 ℃, flow is 800～900 nl/h, pressure is 5～7 mbar, and the acetylene carburizing time is that 10～12s oozes by force, and nitrogen diffusion time is 1000～1200s, final diffusion time 2～3h, the total time of acetylene carburizing time and diffusion is greater than 20h;
After 3 carburizings part is taken out from the low-pressure vacuum carburization stove, carry out high tempering in resistance furnace, tempering temperature is 750 ± 10 ℃, and soaking time is 9～12h, then air cooling;
4 high pressure gas are quenched, and part is heated to temperature in the low-pressure vacuum carburization stove be 1090 ± 10 ℃, and soaking time is 60～90min, then passes into nitrogen and carries out high pressure gas quenching, and pressure is 3000mbar, and inflationtime is 1200s, and the gas rear air cooling of quenching is come out of the stove;
Ice-cold processing is carried out in 5 ice-cold processing in ice-cold case, holding temperature is-73 ℃, and soaking time is 2～2.5h, and heat-eliminating medium is air, comes out of the stove after ice-cold;
6 high temperings carry out high tempering in resistance furnace, holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove, tempering three times, and holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove;
7 final inspections.
The present invention is by the setting to carburization process and parameter, realized the carburizing of s-generation Pinion Steel M50NiL material, make the surface hardness after the carburizing reach HRC61～65, centre hardness reaches HRC40～48, residual austenite is less than 10%, and the microstructure of surface microhardness and heart section meets the corresponding requirements of navigation mark 5492.
Embodiment
A kind of M50NiL material low-pressure vacuum carburization method the steps include:
1 prepares the M50NiL material parts;
2 are placed into part and carry out low-pressure vacuum carburization in the low-pressure carburization stove, the carburizing atmosphere that adopts is acetylene, carburizing temperature is 980 ± 10 ℃, flow is 800～900 nl/h, pressure is 5～7 mbar, and the acetylene carburizing time is that 10～12s oozes by force, and nitrogen diffusion time is 1000～1200s, final diffusion time 2～3h, the total time of acetylene carburizing time and diffusion is greater than 20h;
After 3 carburizings part is taken out from the low-pressure vacuum carburization stove, carry out high tempering in resistance furnace, tempering temperature is 750 ± 10 ℃, and soaking time is 9～12h, then air cooling;
4 high pressure gas are quenched, and part is heated to temperature in the low-pressure vacuum carburization stove be 1090 ± 10 ℃, and soaking time is 60～90min, then passes into nitrogen and carries out high pressure gas quenching, and pressure is 3000mbar, and inflationtime is 1200s, and the gas rear air cooling of quenching is come out of the stove;
Ice-cold processing is carried out in 5 ice-cold processing in ice-cold case, holding temperature is-73 ℃, and soaking time is 2～2.5h, and heat-eliminating medium is air, comes out of the stove after ice-cold;
6 high temperings carry out high tempering in resistance furnace, holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove, and holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove;
7 final inspections.
Embodiment
Material is certain engine gear of M50NiL, maximum outside diameter size φ 145mm, and the thickest sectional dimension is 16mm, requires case depth more than 1.1mm, carburizing rear surface hardness HRC61～65, centre hardness HRC40～48; Surface microhardness is martensite+a small amount of carbide, core structure is low carbon martensite+a small amount of ferrite, residual austenite is less than 10%, and the surface microhardness of assurance material and the microstructure of heart section meet the correlation technique requirement of navigation mark 5492 " carburizing of aviation steelwork, carbonitriding microstructure examination standard ".Its carburization step is:
1 prepares M50NiL material gear part;
2 are placed into part and carry out low-pressure vacuum carburization in the low-pressure carburization stove, the carburizing atmosphere that adopts is acetylene, carburizing temperature is 980 ℃, flow is 850 nl/h, pressure is 6 mbar, and the acetylene carburizing time is that 12s oozes by force, and nitrogen diffusion time is 1200s, final diffusion time 2.5h, the total time of acetylene carburizing time and diffusion is greater than 20h;
After 3 carburizings part is taken out from the low-pressure vacuum carburization stove, carry out high tempering in resistance furnace, tempering temperature is 750 ℃, and soaking time is 11h, then air cooling;
4 high pressure gas are quenched, and part is heated to temperature in the low-pressure vacuum carburization stove be 1090 ℃, and soaking time is 80min, then passes into nitrogen and carries out high pressure gas quenching, and pressure is 3000mbar, and inflationtime is 1200s, and the gas rear air cooling of quenching is come out of the stove;
Ice-cold processing is carried out in 5 ice-cold processing in ice-cold case, holding temperature is-73 ℃, and soaking time is 2h, and heat-eliminating medium is air, comes out of the stove after ice-cold;
6 high temperings carry out high tempering in resistance furnace, holding temperature is 550 ℃, and soaking time is 2h, and air cooling is come out of the stove, tempering three times, and holding temperature is 550 ℃, and soaking time is 2h, and air cooling is come out of the stove;
7 final inspections: the final gear wheel carburization layer depth of part is 1.2mm, surface hardness HRC63, centre hardness HRC45, residual austenite 5%, the microstructure of the surface microhardness of material and heart section meet the correlation technique requirement of corresponding air standard 5492 " carburizing of aviation steelwork, carbonitriding microstructure examination standard ".
Claims (1)
1. a M50NiL material low-pressure vacuum carburization method is characterized in that, described method may further comprise the steps:
(1) prepares the M50NiL material parts;
(2) part is placed into carries out low-pressure vacuum carburization in the low-pressure carburization stove, the carburizing atmosphere that adopts is acetylene, carburizing temperature is 980 ± 10 ℃, flow is 800～900 nl/h, pressure is 5～7 mbar, and the acetylene carburizing time is that 10～12s oozes by force, and nitrogen diffusion time is 1000～1200s, final diffusion time 2～3h, the total time of acetylene carburizing time and diffusion is greater than 20h;
(3) after the carburizing part is taken out from the low-pressure vacuum carburization stove, carry out high tempering in resistance furnace, tempering temperature is 750 ± 10 ℃, and soaking time is 9～12h, then air cooling;
(4) high pressure gas is quenched, and part is heated to temperature in the low-pressure vacuum carburization stove be 1090 ± 10 ℃, and soaking time is 60～90min, then passes into nitrogen and carries out high pressure gas quenching, and pressure is 3000mbar, and inflationtime is 1200s, and the gas rear air cooling of quenching is come out of the stove;
(5) ice-cold processing is carried out in ice-cold processing in ice-cold case, holding temperature is-73 ℃, and soaking time is 2～2.5h, and heat-eliminating medium is air, comes out of the stove after ice-cold;
(6) high tempering carries out high tempering in resistance furnace, holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove, and holding temperature is 550 ± 10 ℃, and soaking time is 2h, and air cooling is come out of the stove;
(7) final inspection.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103290419A (en) * | 2013-06-25 | 2013-09-11 | 清华大学 | Gear treatment method |
| CN103556106A (en) * | 2013-10-30 | 2014-02-05 | 西安航空动力股份有限公司 | Preparation method of high-temperature vacuum carburization layer of 1Cr17Ni2 alloy material |
| CN106755773A (en) * | 2016-12-02 | 2017-05-31 | 哈尔滨东安发动机（集团）有限公司 | The softening method of carburized zone after a kind of CSS 42L pinion steel carburizings |
| CN107740032A (en) * | 2017-09-22 | 2018-02-27 | 成都万可瑞特金属科技有限公司 | The super shallow carburization heat treatment method of vacuum low-pressure |
| CN107829064A (en) * | 2017-11-30 | 2018-03-23 | 江西洪都航空工业集团有限责任公司 | A kind of 12CrNi3A material vacuums carburizing heat treatment process |
| CN108411244A (en) * | 2018-04-19 | 2018-08-17 | 西安交通大学 | A method of improving M50NiL bearing steel Tribological Properties |
| CN109338274A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | A kind of 15Cr14Co12Mo5Ni2WA steel secondary low-voltage vacuum carburization method |
| CN109338280A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | Nitriding method after a kind of three generations's carburizing steel carburizing |
| CN109609891A (en) * | 2018-12-05 | 2019-04-12 | 中国航发哈尔滨东安发动机有限公司 | A kind of BG801 material metallographic structure carburizing control method |
| CN109735795A (en) * | 2019-03-08 | 2019-05-10 | 东北大学 | A kind of 16Cr3NiWMoVNbE material low-pressure vacuum carburization heat treatment method |
| CN111020464A (en) * | 2019-12-19 | 2020-04-17 | 中国航发哈尔滨轴承有限公司 | Vacuum carburizing method for thin-wall bearing ring |
| CN111283389A (en) * | 2020-03-17 | 2020-06-16 | 无锡鹰贝精密轴承有限公司 | End face grinding process for wear-resisting disc of hydraulic motor |
| CN113755671A (en) * | 2021-09-17 | 2021-12-07 | 沈阳工业大学 | Heat treatment method for improving fatigue performance of carburized G13Cr4Mo4Ni4V steel |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103290419A (en) * | 2013-06-25 | 2013-09-11 | 清华大学 | Gear treatment method |
| CN103556106A (en) * | 2013-10-30 | 2014-02-05 | 西安航空动力股份有限公司 | Preparation method of high-temperature vacuum carburization layer of 1Cr17Ni2 alloy material |
| CN103556106B (en) * | 2013-10-30 | 2015-10-28 | 西安航空动力股份有限公司 | A kind of preparation method of 1Cr17Ni2 alloy material high-temperature vacuum cementation zone |
| CN106755773A (en) * | 2016-12-02 | 2017-05-31 | 哈尔滨东安发动机（集团）有限公司 | The softening method of carburized zone after a kind of CSS 42L pinion steel carburizings |
| CN107740032A (en) * | 2017-09-22 | 2018-02-27 | 成都万可瑞特金属科技有限公司 | The super shallow carburization heat treatment method of vacuum low-pressure |
| CN107829064A (en) * | 2017-11-30 | 2018-03-23 | 江西洪都航空工业集团有限责任公司 | A kind of 12CrNi3A material vacuums carburizing heat treatment process |
| CN108411244A (en) * | 2018-04-19 | 2018-08-17 | 西安交通大学 | A method of improving M50NiL bearing steel Tribological Properties |
| CN108411244B (en) * | 2018-04-19 | 2020-06-19 | 西安交通大学 | Method for improving surface tribological performance of M50NiL bearing steel |
| CN109338280A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | Nitriding method after a kind of three generations's carburizing steel carburizing |
| CN109338274A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | A kind of 15Cr14Co12Mo5Ni2WA steel secondary low-voltage vacuum carburization method |
| CN109609891A (en) * | 2018-12-05 | 2019-04-12 | 中国航发哈尔滨东安发动机有限公司 | A kind of BG801 material metallographic structure carburizing control method |
| CN109609891B (en) * | 2018-12-05 | 2022-04-01 | 中国航发哈尔滨东安发动机有限公司 | Carburization control method for metallographic structure of BG801 material |
| CN109735795A (en) * | 2019-03-08 | 2019-05-10 | 东北大学 | A kind of 16Cr3NiWMoVNbE material low-pressure vacuum carburization heat treatment method |
| CN111020464A (en) * | 2019-12-19 | 2020-04-17 | 中国航发哈尔滨轴承有限公司 | Vacuum carburizing method for thin-wall bearing ring |
| CN111283389A (en) * | 2020-03-17 | 2020-06-16 | 无锡鹰贝精密轴承有限公司 | End face grinding process for wear-resisting disc of hydraulic motor |
| CN111283389B (en) * | 2020-03-17 | 2021-10-22 | 无锡鹰贝精密液压有限公司 | End face grinding process for wear-resisting disc of hydraulic motor |
| CN113755671A (en) * | 2021-09-17 | 2021-12-07 | 沈阳工业大学 | Heat treatment method for improving fatigue performance of carburized G13Cr4Mo4Ni4V steel |
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