40CrMo绳轮的激光表面硬化处理  

Research on Laser Heat Treatment of 40CrMo Elevator Wheel

作　　者：王慧萍[1] 戴建强[1] 奚文龙[1] 李军[1] 

机构地区：[1]上海工程技术大学激光工业技术研究所,上海201600

出　　处：《实验室研究与探索》2011年第2期41-43,共3页Research and Exploration In Laboratory

基　　金：上海市科委攻关资助项目(08520513400);上海市重点学科建设项目(J51402)

摘　　要：采用HL-5000型横流CO2激光加工机,应用宽带技术,选择合适的激光工艺参数,对40CrMo电梯绳轮进行了激光相变硬化处理。研究了40CrMo激光淬硬层从表至里显微组织的变化,40CrMo激光淬火后其组织由淬硬层、过渡区和基体组成。在相变硬化区自表至里组织分别为:表层细小针状马氏体和残余奥氏体;次表层隐针状马氏体和残余奥氏体;过渡区由隐晶马氏体、残余奥氏体、屈氏体和回火索氏体组成;基体为回火索氏体组织。测量了淬硬层的性能,淬硬层的硬度可达到760HV0.1,硬化层深度约为0.75 mm。达到电梯绳轮的技术要求。绳轮实样耐磨性模拟试验表明:激光淬火后耐磨性有很大的提高。The laser hardening was carried out for 40CrMo steel elevator wheel using 5.0 kW continuous wave CO2 laser,applying the wide-band technology,choosing right laser-processing parameters.Microstructure changes in laser treated 40CrMo were researched.Microstructure of 40CrMo lasered hardening consists of laser hardening zone,interim zone and original.The surface microstructure of laser hardening zone is fine martensite and remains austenite.The time surface was very fine martensite and remains austenite.Interim zone consists of very fine martensite,remains austenite,troosite and temper sorbite.The original was temper sorbite.The performance of hardened was tested.The microhardness of hardened reachs 760HV0.1,The hardened depth is approximately 0.75 mm.The results of simulated test indicate that the elevator wheel of laser hardened enhances the wear resistantce of original greatly.

关 键 词：绳轮40CrMo 激光相变硬化 显微组织 耐磨性 

分 类 号：TG156.93[金属学及工艺—热处理]