两种常用高速钢刀具材料脉冲放电强化层结构和性能的差异性对比分析
Difference Analysis of Structure and Properties of Electro-spark Alloyed (ESA) Coating About Two Kinds of High-speed Steel Tool Materials
翟红雁
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作者单位：(北华航天工业学院 材料工程系, 河北 廊坊 065000)
中文关键字：脉冲放电； 高速钢； 结构； 耐磨性； 过热敏感性
英文关键字：electro-spark alloying (ESA); high-speed steel; microstructure, wear resistant; overheating sensitivity
中文摘要：对两种常用高速钢刀具材料W6Mo5Cr4V2和W9Mo3Cr4V的脉冲放电强化工艺进行了实验研究，通过对强化层的检测发现，W6Mo5Cr4V2的强化层不论在硬度、耐磨性还是涂层厚度上都高于W9Mo3Cr4V；用XRD分析强化层结构时发现，两者强化层的主强化相明显不同，W6Mo5Cr4V2为W2C，而W9Mo3Cr4V却为Fe3W3C。这是因为材料中W含量不同所致；而两种材料的过热敏感性差异是导致厚度不同的主要原因。实验数据对比表明，W6Mo5Cr4V2高速钢显示出更好的综合强化效果。
英文摘要：Two different HSS tool materials W6Mo5Cr4V2 and W9Mo3Cr4V were strenghthed by electro-spark alloying. Alloyed coatings were characterized, it is found that the hardness, wear resistant and thickness of W6Mo5Cr4V2 coating are higher than those of W9Mo3Cr4V. The microstructure of the coatings was characterized by XRD, it is found that the main strengthening phase in the two kinds coatings is markedly different, W6Mo5Cr4V2 is W2C phase, but W9Mo3Cr4V is Fe3W3C phase. This is because the content of W in two materials is different. The difference of overheating sensitivity about two materials is the main reasons leading to their different thickness. Experimental datas show that W6Mo5Cr4V2 steel has better comprehensive strengthening effects.