Design Of Matrix Structure And Study Of Surface Abrasion Of WCp Reinforced Iron Matrix Surface Composites

The use requirements of metal material have improved with the rapid development of industry. Especially for the wear-resistant material, which need high wear-resistance and impact resistance. In this article, WC particles(WCp) reinforced iron matrix surface composites which were fixed the volume fraction of the WCp and adjusted the mass fraction of the alloy elements(Cr, Co) in the matrix were prepared successfully by Vacuum Expendable Pattern Castingprocess. This purpose was to improve matrix structure, micro-interfacial and wear-resistant.The microstructure of the surface composites were researched by optical microscope(OM), scanning electron microscope (SEM), energy dispersion spectrum(EDS) and X-ray diffractometer(XRD). The results show that carbide particles volume fraction increases with the increase of Cr element in the matrix. Meanwhile, microinterface consists of long strip of Fe6W6C. On the basis of the surface composites adding Cr element, with the increase of Co content in the matrix, the Co3W3C and (Fe,Cr)7C3increased and decreased respectively. The fine Co6W6C constitutes the micro-interface. Meanwhile, the Co element hinder the melting of the WCp, increase the diffusion velocity of W element and the content of graining of pearlite, and Co is functioned as solution strengthening elements in the matrix structure.The three-body abrasions of the surface composites were tested. The results show that the wear-resistant gradual raised with the increase of the Cr content. On the basis of surface composites adding Cr element, when the Co content increased to2.3wt%, the wear-resistant is the highest, which raised55%compared with the surface compostes that only addiing Cr element in the matrix.The3J impact energy abrasions of the surface composites were tested. The results show that the wear-resistant gradual raised and lowered with the increase of the Cr content in matrix. When the Cr content increased to13.9wt%, the wear-resistant is the highest, which raised50.4%compared with the surface compostes that no addiing Cr element in the matrix. On the basis of surface composites adding Cr element, the wear-resistant of surface composites raised and lowered with the increase of the mass fraction of Co in matrix. When the Co content increased to2.3wt%, the wear-resistant is the highest, which raised43.8%compared with the surface composites only addiing Cr element in the matrix.The wear morphologys of the surface composites were analysed by the SEM. The results show that fall off and fatigue rupture for WCp, fatigue fracture and fatigue wear for matrix were the main wear styles in the process of three-body and impact abrasion of the surface composites.