通过对3种齿轮钢20CrNi2Mo、17CrNiMo6、20CrMnMo进行渗碳及热处理,研究了不同渗碳时间后3种钢的表面碳含量及热处理前后的渗层硬度和组织。结果表明：3种钢的合金系数从高到低依次为20CrMnMo钢、17CrNiMo6钢、20CrNi2Mo钢,合金系数越大,相同渗碳条件下表面碳含量越高;高温回火前3种渗碳层的表面硬度均在45HRC以上,回火后均有所降低;高温回火前渗碳层的组织为马氏体、残余奥氏体等非平衡态混合组织。
Three kinds of common and typical gear steels were carburized and heat treated,and the surface carbon contents of three kinds of steels after different carburizing times,and the hardness,microstructure of carbonization layers before and after heat treatment were studied.The results show that the alloy coefficients of three kinds steels were,from high to low,20CrMnMo steel,17CrNiMo6 steel and 20CrNiMo steel.The surface carbon contents increased with the increase of alloy coefficients under the same carbonization conditions.The surface hardness of three kinds of steels were all over 45 HRC before high-temperature tempering,and decreased after tempering.The microstructure before high-temperature were all nonequilibrium mixed microstructure of martensite and retained austenite.
参考文献
| [1] | 陈国民.对我国齿轮渗碳淬火技术的评述[J].金属热处理,2008(01):25-33. |
| [2] | 孙广平,杜之明,刘长江,康达昌.大型齿轮渗碳时网状碳化物形成的原因及消除的方法[J].汽轮机技术,2004(03):230-231. |
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