不锈钢激光表面熔凝处理的组织特征  

MICROSTRUCTURE FEATURES OF STAINLESS STEEL AFTER LASER SURFACE REMELTING AND SOLIDIFICATION

作　　者：潘清跃[1] 李延民[1] 黄卫东[1] 林鑫[1] 丁国陆[1] 周尧和[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室

出　　处：《金属学报》1996年第7期718-722,共5页Acta Metallurgica Sinica

基　　金：中国工程物理研究院院外基金;国家自然科学基金

摘　　要：不锈钢经激光表面熔凝处理后，其组织形态发生了显著的变化，在表面熔凝层中分别出现白亮带、细胞晶、胞枝结构以及紊乱枝晶组织，对其形成原因进行了分析．在激光熔池中观察到典型的胞枝转变，对转变的临界条件进行了深入研究，结果表明：实验确定的胞枝转变临界速度与最近提出的ＢＪＴ模型的预言值符合得较好．The microstructure features of stainless steel have changed remarkably after laser surface remelting and solidification. Light band, fine cell, cell-dendrite structure and disordered dendrite are found in the surface layer, meanwhile, the causes for their formation have been analyzed. The typical cell-to-dendrite transition is observed at the center of laser melt pool, and a detailed investigation on the transition conditions shows that the critical transition velocity determined by experiment agrees well with the prediction of recent BJT model.Correspondent: PAN Qingyue, Lab.403, Northwestern Polylechnical University, Xi'an 710072

关 键 词：激光表面熔凝 不锈钢 凝固 组织 

分 类 号：TG142.71[一般工业技术—材料科学与工程]