灰铸铁经激光熔凝后的组织  

Microstructure of Laser Melted Gray Cast Iron

作　　者：朱捷[1] 刘家濬 陈南平[1] 

机构地区：[1]清华大学

出　　处：《机械工程材料》1991年第1期42-46,共5页Materials For Mechanical Engineering

摘　　要：激光熔凝后的灰铸铁具有枝晶型或共晶表层+枝晶型组织。共晶表层由于形成Fe_3C和马氏体而得到极高的硬度和较好的耐磨性。另外,还分析了熔凝区中石墨的行为及过渡区的组织。Laser melted zones of gray cast iron have two kinds of microstructure: One is eutectic structure with high hardness (～1010 Hv) and wear resistance the other is dendritic structure with low hardness. TEM and quantitative x-ray analysis show that the former is strengthened by Fe_3C carbides and martensite. In addition, the behavior of graphite in laser melted zone and transition zone is discussed.

关 键 词：灰口铸铁 激光熔凝 组织 

分 类 号：TG143.2[一般工业技术—材料科学与工程]