GCr15钢凸轮的热处理试验  

Trial Heat Treatments for GCr15 Steel Cam

作　　者：苏阳 史有森 张志冲 王琴 SU Yang;SHI Yousen;ZHANG Zhichong;WANG Qin(Jiangsu Fengdong Thermal Technology Co.,Ltd.,Yancheng 224100,Jiangsu,China)

机构地区：[1]江苏丰东热技术有限公司,江苏盐城224100

出　　处：《热处理》2025年第1期5-8,共4页Heat Treatment

摘　　要：对GCr15钢凸轮分别进行气体氮碳共渗、保护气氛炉中油淬、气体氮碳共渗+保护气氛炉中油淬的复合处理,然后检测凸轮表层的氮碳含量、显微组织、表面硬度及硬化层深度。结果表明:经580℃气体氮碳共渗6h的凸轮表层形成了约20μm厚的化合物层,其含氮量约为0.2%,扩散层深约650μm;经复合处理的凸轮表层氮化合物完全分解,扩散层深约750μm,氮的固溶强化使扩散层硬度比淬火态硬度约高30HV0.3,但产生的孔隙及表面氧化和脱碳导致表面硬度下降。GCr15 steel cams were gas nitrocarburized,oil quenched in protective atmosphere furnace,and gas nitrocarburized then oil quenched in protective atmosphere furnace,respectively.Subsequently,the cams were tested for carbon and nitrogen contents in case,microstructures,surface hardness and hardening layer depth.The results showed that(a)the cam gas nitrocarbuizd at 580℃for 6 h exhibited 20-μm-thick compound layer,nitrogen content of about 0.2%and about 650-μm-deep diffusion layer,in the case;and(b)for the complexly treated cam,the nitride completely decomposed,the diffusion layer was as depth as about 750μm,the hardness of the diffusion layer was about 30 HV0.3 higher than that of the as-quenched hardness because of nitrogen-induced solid solution strengthening,however,the formation of pores and the oxidation and decarburization of surface resulted in the decrease in surface hardness.

关 键 词：气体氮碳共渗 保护气氛 淬火 复合处理 

分 类 号：TG156.82[金属学及工艺—热处理]