高速钢激光表面熔凝层的显微结构  

MICROSTRUCTURE OF LASER TREATED LAYER ON HIGH SPEED TOOL STEEL

作　　者：李成劳[1] 沈莲[1] 刘军海[1] 

机构地区：[1]西安交通大学

出　　处：《金属学报》1991年第4期A261-A264,共4页Acta Metallurgica Sinica

摘　　要：本文对W_(18)Cr_4V高速钢进行激光表面熔凝处理,采用光学显微镜和透射电镜分析表明,熔凝层组织为极细的树枝晶。部分枝晶中心保留有δ铁素体。枝晶内为孪晶马氏体和少量位错马氏体,孪晶马氏体上沿孪晶面M_(23)C_6碳化物呈薄片状共格析出。枝晶臂间为富W,V和Cr合金元素的奥氏体和M_6C碳化物。The microstructure of the laser melted and resolidified layer on high speed tool steel W_(18)Cr_4V observed is of very fine dendrites. The δ-ferrite remains in the centre of part of the dendrites. The interior of dendrite is the twinned mar- tensite and a few dislocation martensite. M_(23)C_6 carbide along twin plane on twinned martensite may coherently precipitate as thin plate. The austenite enriched with al- loying elements as W, V and Cr, and M_6C carbide are found among the dendrite arms.

关 键 词：高速钢 激光 表面改性 显微结构 

分 类 号：TG142.45[一般工业技术—材料科学与工程]