摘要
利用无氦横流CO2激光加工机对40Cr表面进行激光相变硬化处理,采用扫描电子显微镜(SEM)、立式金相显微镜(OM)、努氏显微硬度计、滑动摩擦磨损试验机和恒电位仪等设备对不同入射角相变硬化层的显微组织及性能进行研究。结果表明:相变硬化区的组织为隐晶马氏体+残余奥氏体,过渡区的组织为马氏体+残余奥氏体+铁素体+碳化物;激光入射角度增大,硬化层的深度减小。当入射角度为10°时,硬化层深度最大,为839μm。其硬化层的硬度比基体提高约4倍,耐磨性提高8倍,耐蚀性也显著提高。
Laser transformation hardening was carried on the matrix 40Cr with helium-free crossflow CO2 laser processing machine. The microstructure and properties of phase transformation hardened layers for different incident angles were studied with scanning electron microscope （SEM）, upright metallurgical microscope（OM）, knoop microhardness tester, sliding friction wear tester and potentiostat. The results indicated that the microstructure of the phase hardened region was cryptocrystalline martensites and retained austenites, and that of transition region was tempered martensites, and retained austenites and ferrites and carbides. The depth of hardened layer decreased with the increase of laser incident angle. When incident angle was 10°, the depth of hardend layer was maximal （839 μm）. The hardness of hardened layer increased by 4 times than that of the matrix, and the wearing resistance increased by 8 times. Moreover, the corrosion was also significantly increased.
出处
《冶金分析》
CAS
CSCD
北大核心
2010年第6期16-20,共5页
Metallurgical Analysis
基金
辽宁省2009年研究生教育创新计划项目"产学研基地建设"资助
关键词
激光相变硬化
显微组织
不同入射角度
硬化层性能
laser transformation hardening
microstructure
different incident angle
hardened layer performance
