激光熔覆修复合金球墨铸铁风冷辊的研究  

Study on Alloy Ductile Iron Air-cooled Roller Repaired by Laser Cladding

作　　者：谢雨田 吴光辉[2] 王春霞[3] 周圣丰[3] 

机构地区：[1]方大特钢科技股份有限公司建安公司,江西南昌330012 [2]南昌航空大学环境与化学工程学院,江西南昌330063 [3]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《热加工工艺》2012年第24期168-169,172,共3页Hot Working Technology

摘　　要：采用自制的专用铁基合金粉末,对合金球墨铸铁风冷辊进行了激光熔覆修复。利用光学显微镜、X-射线衍射仪与数字显微硬度计对激光熔覆修复层的组织结构及硬度进行了研究。结果表明,激光熔覆修复层呈树枝状晶生长,与风冷辊形成了良好的冶金结合,表面较平整、无气孔与裂纹,主要由过饱和马氏体与金属间化合物Fe3.5B组成,平均显微硬度达753 HV0.2,相对于风冷辊提高了约43.7%。The alloy ductile iron air-cooled roller was repaired by laser cladding with self-made Fe-based alloy powder. The microstmcture and microhardness were investigated with optical microscope, X-ray diffraction and hardness tester. The results show that the coating repaired by laser cladding takes on the dcndric growth, has a metallurgical bonding to substmte, a good profile, no pores and cracks. The phases of coating arc composed of the supersaturated martensite and intcrmctallic Fc3.sB. The average microhardness of coating is 753 HV0.2, which is increased by about 43.7% compared with the air-cooled roller.

关 键 词：风冷辊 合金球墨铸铁 激光熔覆 显微结构 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]