摘要
对42CrMo销轴进行表面改性处理,研究了碳氮共渗热处理工艺下材料显微组织和力学性能的演变规律。结果表明,42CrMo钢经碳氮共渗改性处理后,表面显微组织为碳氮共渗硬化层,芯部组织为低温回火混合马氏体和片条状铁素体;材料在不损失芯部塑韧性的同时,表面硬度得到大幅提高。经200℃低温回火后,42CrMo钢抗拉强度基本保持不变,芯部冲击韧度约提高了7.7%,表面硬度高达650 HV。
Surface modification of 42CrMo pin shaft was carried out, and the evolution of mierostructure and mechanical properties of materials under carbonitriding heat treatment process was studied. The results show that, 42CrMo steel surface microstructure is carbonitriding hardening layer and core microstructure is tempering of martensite and ferrite sheet strip after carbonitriding modification; Without losing the core material plasticity and toughness, surface hardness improves vastly at the same time. After tempering at 200 ℃, 42CrMo steel tensile strength basically unchanges but core toughness improves by 7.7 % and surface hardness is 650 HV.
出处
《热加工工艺》
CSCD
北大核心
2016年第4期202-204,208,共4页
Hot Working Technology
基金
江苏省大学生实践创新训练计划项目(201411998079X)
江苏省大型工程装备检测与控制重点实验室开放课题(JSKLEDC201309)
