Microstructure evolution of WC/steel composite by laser surface re-melting
Microstructure evolution of WC/steel composite by laser surface re-melting
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DOI：
10.1016/j.apsusc.2006.09.061
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发表时间：
2007-02
影响因子：
6.7
通讯作者：
You Xian-qing;Zhang Chengjun;Song Xue-feng;Huang Man-ping;M. Jianguo
中科院分区：
文献类型：
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作者：
You Xian-qing;Zhang Chengjun;Song Xue-feng;Huang Man-ping;M. Jianguo
采用横流CO2激光对电渣熔炼铸造法制备的WC/钢复合材料进行重熔。使用光学显微镜、扫描电子显微镜、能量色散光谱、X射线衍射和透射电子显微镜来分析激光熔化层的微观结构演变。研究发现，激光影响区分为三个明显的区域：熔化区、瞬态区和热影响区。熔化区的物相由WC、Fe3W3C、(Cr,Fe)7C3、马氏体和残余奥氏体组成。熔化区显微组织演变表现为钢基体、WC颗粒团簇和弥散碳化物三部分的转变。一种重要的反应物是 Fe3W3C 的人字形共晶碳化物。激光扫描速率的影响主要表现在影响熔深、过渡区显微组织以及介质碳化物的溶解。与基体相比，熔化区具有更高的显微硬度。
WC/steel composites fabricated by electro-slag melting and casting were re-melted by transverse flow CO2laser. Optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and transmission electron microscopy were used to analyze the microstructure evolution in laser melted layer. It was found that the laser-affected zone has three distinguished zones, the melted, transient and heat affected zone. The phases of the melted zone were composed of WC, Fe3W3C, (Cr,Fe)7C3, martensite and retained austenite. The microstructure evolution in the melted zone was represented by the transformation of three parts including the steel matrix, WC particles cluster and dispersed carbides. A significant reactant was herringbone eutectic carbide of Fe3W3C. The effect of laser scanning rate was mainly behaved in affecting the melt depth, microstructure of transient zone and dissolution of medium carbides. In comparison with the substrate, the melted zone has much higher microhardness.