精密齿轮件的真空低压渗碳高压气淬热处理
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摘要
采用真空低压渗碳和高压气淬相结合的工艺代替以往的气氛渗碳和油淬工艺,在WZST-60G双室真空渗碳设备上进行SCM420精密齿轮的热处理工艺研究,并对其显微组织、硬度、表面碳浓度、变形量等重要工艺指标进行分析。结果表明:930℃渗碳后,在830℃进行2. 0 MPa高压气淬,经160℃回火后,齿轮碳化物等级为1级,表面硬度可达60 HRC,变形量小于0. 04 mm,完全符合工艺要求。
The heat treatment technology of SCM420 precision gear was studied on WZST-60 G double-chamber vacuum carburizing equipment by using vacuum low pressure carburizing and high pressure gas quenching,instead of the previous process of atmosphere carburizing and oil quenching. The important technological indexes such as microstructure,hardness,surface carbon concentration and distortion were analyzed. The results show that after vacuum carburized at 930 ℃,2. 0 MPa high-pressure gas quenching at 830 ℃ and tempered at 160 ℃,the SCM420 gear fully meets the technical requirements,with gear carbides grade 1,surface hardness up to 60 HRC,distortion less than 0. 04 mm.
The heat treatment technology of SCM420 precision gear was studied on WZST-60 G double-chamber vacuum carburizing equipment by using vacuum low pressure carburizing and high pressure gas quenching,instead of the previous process of atmosphere carburizing and oil quenching. The important technological indexes such as microstructure,hardness,surface carbon concentration and distortion were analyzed. The results show that after vacuum carburized at 930 ℃,2. 0 MPa high-pressure gas quenching at 830 ℃ and tempered at 160 ℃,the SCM420 gear fully meets the technical requirements,with gear carbides grade 1,surface hardness up to 60 HRC,distortion less than 0. 04 mm.
引文
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[3]金荣植.先进的齿轮低压真空渗碳与高压气淬技术及装备[J].金属加工(热加工),2014(11):8-10.
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[5]赵文军,刘国强,王金栋,等.20Cr2Ni4A齿轮钢高温渗碳工艺[J].金属热处理,2015,40(12):142-145.Zhao Wenjun,Liu Guoqiang,Wang Jindong,et al.High temperature carburizing process of 20Cr2Ni4A gear steel[J].Heat Treatment of Metals,2015,40(12):142-145.
[6]高元坤.渗碳钢件的表面含碳量与其性能的关系[J].材料工程,1992(2):52-54.Gao Yuankun.Relationship between surface C content and properties of carburized steel components[J].Journal of Materials Engineering,1992(2):52-54.
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