中文摘要：

通过碳热还原氮化法合成了不同钛含量的（V,xTi）（C,N）（x=5%、10%、15%（质量分数））固溶体粉末晶粒细化剂,并考察了它们对WC-8%Co硬质合金显微组织和机械性能的影响。结果表明,与V（C,N）或者V（C,N）/Ti（C,N）混合晶粒细化剂相比,（V,Ti）（C,N）固溶体粉末可以显著地提高WC-8%Co硬质合金的机械性能;当加入0.5%（质量分数）的（V,5Ti）（C,N）固溶体粉末时,WC-8%Co硬质合金的抗弯强度和硬度分别达3490MPa、1804HV30,WC平均晶粒尺寸约为0.5～0.6μm。

英文摘要：

Three kinds of ultrafine（V,xTi）（C,N） solid-solution powders were synthesized as grain refiners by CRN method,where x was 5%,10%,15wt%,respectively.The effects of（V,Ti）（C,N） solid-solution powders on microstructure and mechanical properties of WC-8%Co sintered samples were researched.The experimental results showed that（V,Ti）（C,N） ultrafine powders could obviously improve the mechanical properties of WC-8%Co cemented carbides compared with V（C,N） or V（C,N）/Ti（C,N） grain refiners.WC-8%Co cemented carbides with 0.5wt%（V,5Ti）（C,N） have optimal mechanical properties of bending strength of 3490MPa and hardness of 1804 HV30.The grain growth is inhibited at about 0.5-0.6μm in size.