Fe901合金粉末激光熔覆层组织分布与缺陷产生机理分析  

Analysis of microstructure distribution and defect generation mechanism of the laser cladding layer with Fe901 alloy powder

作　　者：闫晓玲[1,2] 董世运[2] 徐滨士[2] 闫世兴[2] 王望龙[2] 

机构地区：[1]北京工商大学材料与机械工程学院,北京102488 [2]装甲兵工程学院装备再制造技术国防科技重点实验室

出　　处：《制造技术与机床》2013年第12期115-118,共4页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金项目资助(50975287);国家973项目(2011CB013405)

摘　　要：利用Fe901合金粉末在45#钢基体上进行多层激光熔覆,利用光学显微镜(OM)观察了激光熔覆层的金相组织。实验发现成形体内基体结合区的显微组织以致密的平面晶为主,单层熔覆区内的显微组织以柱状晶和树枝晶体为主,层间结合区的显微组织发生一定程度的粗化,顶部区域的显微组织出现细小的等轴晶,成分不均匀性变大。对激光熔覆层缺陷产生的机理进行了分析,通过优化激光熔覆工艺参数,借助外界因素调整激光熔覆层内部组织分布特征,可以有效减少缺陷的产生,给出了控制缺陷产生的具体方法和手段。Fe901 alloy powder were clad by using laser multi- layer on the substrate of 45# steels. The microstructure of laser cladding layer were observed by using optical microscopy( OM). It was found that the microstructure of binding area in forming body are mainly constituted of tiny compact flat grains,columnar grains and dendritic grains are distributed in single layer cladding area,there is a certain degree of roughening to the microstructure of interlayer area,small equiaxed grains are distributed on top area and composition heterogeneity increase. The mechanism of laser cladding layer defects generation were analyzed. The generation of defects can decrease effectively by optimizing the laser cladding process parameters,adjust the microstructure distribution characteristics of laser cladding layer with the help of external factors,the specific methods and means of control deficiencies are given.

关 键 词：激光熔覆 金相组织 缺陷 控制 

分 类 号：TG115.28[金属学及工艺—物理冶金]