摘要
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.
出处
《机械工程材料》
CAS
CSCD
北大核心
2012年第2期49-51,共3页
Materials For Mechanical Engineering
关键词
齿轮钢
渗碳
热处理
gear steel
carburizing
heat treatment
