借助扫描电镜、透射电镜及X射线衍射仪研究了W6Mo5Cr4V2(M2)高速钢激光熔凝后的显微组织,结果表明,熔化区最深处的显微组织细小,其形态类似于铸锭凝固的激冷区。较狭窄的激冷区形成后,长柱状晶向熔体内生长;最后,靠近表面的熔化区上部是细致的等轴细胞状组织,其中细胞晶及柱状晶内部由马氏体和残余奥氏体组成,而合金碳化物M_6C,Cr_7C_3及MC分布在胞晶和柱状晶的界面上.由于存在马氏体组织,因此激光熔凝组织具有HV_(0.1)865—960的高硬度。
Microstructure of the deepest zone of laser fursxed high speed steel W6MoSCr4V2(M2) was found to be so fine as the chill zone of a solidified ingot. When narrower chill zone formed, the long columnar dendrites grow into the melt and then the fine equiaxed cellular structure reveals in upper melt region nearby surface. The substructure of cellular grains and dendrites was observed to consist of martensite and retained austenite, while the carbides as M_6C, Cr_7C_3 and MC distributed at their interfaces. It is believed that the high microhardness, HV_(0.1)=865—960, of the laser fused structure of the alloy is due to the occurrence of martensite.
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