碳含量对WC-10Co-0.6Cr_3C_2硬质合金组织结构与性能的影响

Effect of carbon content on microstructure and properties of WC-10Co-0.6Cr_3C_2 cemented carbide

采用压力烧结法制备不同碳含量的 WC-10Co-0.6Cr3C2硬质合金，通过金相组织观察、硬度测试、比饱和磁化强度和矫顽磁力的分析，研究该合金的微观组织结构和性能。结果表明，随碳含量增加，合金的饱和磁化强度增大，而密度、矫顽磁力及硬度均降低；在压力烧结条件下，对于 WC-10Co-0.6Cr3C2合金，两相正常组织对应的碳含量范围为5.41%～5.55%。碳含量低于5.41%时出现缺碳相η相，碳含量高于5.55%时出现石墨相。

WC-10Co-0.6Cr3C2 cemented carbides was prepared by sinter-HIP. The physical and mechanical properties of the alloys with different carbon contents were tested by OM RHA analysis,magnetic saturation and coercive force analysis. The results show that the hardness, density and coercive force of the alloys decrease with carbon content increase. When the carbon content of the alloy varies from 5.41%to 5.55%, the alloys have a two-phase structure. When the carbon content of the alloys is lower than 5.41%, a carbon deficiency phase, i.e. the η phase appeares. When the carbon content of the alloys is higher than 5.55%, a free carbon phase appeares.