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利用V-EPC法制备了WC颗粒增强钢基表层复合材料。通过金相、扫描电镜、XRD、显微硬度及冲击磨料磨损性能测试等手段重点研究了在预制层中添加镍基自熔合金粉末(Ni6025WC)后,WC在基体中的溶解对复合材料组织和性能的影响。结果表明,WC在复合层中全部溶解使复合层基体中出现珠光体,残留奥氏体,马氏体以及M6C型碳化物,经分析知该M6C型碳化物为Fe3W3C。本试验得到的试样显微硬度与同类WC/钢基表层复合材料相比显著降低,冲击磨料磨损下的体积磨损率也较高。这些均表明WC在基体中过度溶解和Fe3W3C在基体中的含量较多时,复合材料的性能较差。
WC particle reinforced steel-based surface composite was prepared by V-EPC method. The effects of dissolution of WC in the matrix on the microstructure and mechanical properties of the composites were investigated by means of metallographic examination, scanning electron microscopy, XRD, microhardness test and wear test of impact abrasive. The impact of performance. The results show that all the dissolution of WC in the composite layer causes the pearlite, retained austenite, martensite and M6C carbides to appear in the composite matrix, and the M6C carbides are analyzed to be Fe3W3C. The microhardness of the sample obtained in this test is significantly lower than that of the WC / steel matrix composite with the same kind of material, and the volume abrasion rate under the impact abrasion is also higher. All of these show that WC is poorly soluble in matrix and Fe3W3C is more in matrix.