高铬铸铁轧辊的激光表面熔敷再制造  

High-Cr Cast Iron Roll Remanufactured by Laser Surface Cladding Technology

作　　者：严凯[1] 张敏[1] 陈长军[1] 李洋[1] 王晓南[2] 邹涛[1] 胡增荣[3] 吴志芳 

机构地区：[1]苏州大学机电工程学院激光加工中心,江苏苏州215021 [2]苏州大学沙钢钢铁学院,江苏苏州215021 [3]苏州大学轨道交通学院,江苏苏州100024 [4]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《应用激光》2016年第3期253-258,共6页Applied Laser

基　　金：苏州市科技基础研究计划资助项目(项目编号:SYG201231);国家自然科学基金资助项目(项目编号:51104110)

摘　　要：采用横流CO_2激光器并利用50%Cr_3C_2和50%的Ni-Cr合金粉末对高铬铸铁轧辊表面进行激光熔覆实验。利用金相显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、显微硬度计(HV)、磨损试验机分别研究了不同工艺参数下熔覆层组织形貌,相结构和成分、硬度分布和磨损性能。实验结果表明,适宜的工艺参数有利于得到理想的熔覆形貌和提高熔覆效率并避免裂纹的形成,熔覆层的表面组织为Cr_3C_2和M7C3型碳化物,表层硬度显著提高,可达1 100 HV为基体的2倍,同时熔覆层耐磨性能得到有效提高。Laser surface cladding with 50 % Cr3 C2 and 50 % Ni-Cr powder is performed on the high-Cr content roller steel by using a 5 kW continuous wave CO2 laser. The microstructure, phase structure and composition, distribution of hardness and wear properties were analyzed by optical microscopy （OM）, scan electron microscopy （SEM）, Energy spectrum （EDS） and wear tester under different laser parameters. The results show that proper parameters can contribution to obtain better cladding morphology ,improve the process efficiency and avoid crack formation. The microstructure of the cladding surface consists of Cr3C2 and M7C3. The hardness of the cladding surface is 1 100 HV, which is twice as much as that of the substrate, what＇s more, the wear resistance is obviously improved.

关 键 词：轧辊 激光熔敷 高铬铸铁 耐磨性 

分 类 号：TG156[金属学及工艺—热处理]