材料对激光多层涂覆定向凝固显微组织的影响  

Influence of the materials on the solidification microstructure of laser multi-layer cladding

作　　者：冯莉萍[1] 林鑫[1] 陈大融[2] 李延民[1] 杨海欧[1] 黄卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《航空材料学报》2004年第1期7-11,共5页Journal of Aeronautical Materials

基　　金：863国家高技术研究发展计划(2001AA337020);973国家重点基础研究发展规划专题(G2000067205 3)

摘　　要：利用316L不锈钢和Ni35两种合金粉末在定向凝固镍基高温合金基材上进行激光多层涂覆实验,并对涂层内部的凝固显微组织形成机理进行研究。结果表明在本文的实验条件下,利用316L不锈钢材料可以得到晶体取向良好的定向凝固涂覆层。而对于本身容易形成等轴晶的Ni35自熔合金,尽管实验在定向凝固的基材上进行,涂层中的凝固显微组织仍趋向于等轴晶形态。316L stainless steel and Ni35 self-melt alloy were selected to perform laser multi-layer cladding experiments on the Ni-base superalloy directional solidification substrate. Mechanisms of microstructure formation were investigated. Results show that directional solidification cladding layers of 316L stainless steel with fine crystallography orientation under the processing parameters mentioned in this paper were obtained. While for the nickel-base self-melted alloy Ni35 which is not easy to acquire columnar dendrite tend to appearing equiaxed grains in the cladding layers under similar processing condition.

关 键 词：激光多层涂覆定向凝固 显微组织 等轴晶 镍基合金 Ni35粉末 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]