【摘要】 采用低压烧结技术制备了不同Cr含量的WC-8Co硬质合金,通过XRD、SEM和力学性能测试等手段分析了Cr含量对硬质合金物相、显微结构和合金的力学性能的影响。结果表明,当Cr含量<0.9%时,合金由WC+γ-(WC)相组成,添加量增至0.9%及以上时,组织中出现缺碳相Co3W3C;随着Cr含量的增加,WC晶粒不断细化,当添加量为0.6%时,合金的综合力学性能最佳,其抗弯强度、维氏硬度及断裂韧性分别为3885MPa、1632.4HV30、9.82MPa.m1/2。更多还原

【Abstract】 WC-8Co cemented carbide added with different content of Cr was obtained by the low pressure sintering technology.The microstructure,phase of the alloys were studied by using scanning electron microscopy(SEM) and X-ray diffraction analysis(XRD),and compared the mechanical properties.The experiment results show that,when the content of Cr was inferior to 0.9%,the microstructure of alloys consisted of WC and γ solid solution.As the content of Cr reached 0.9%,the ternary W3Co3C phase emerged;the growth of WC grains was inhibited sufficiently.The better synthetically mechanical property was obtained by addition of 0.6%.The bending strength,Vickers hardness and fracture toughness were: 3885MPa,1632.4HV30,9.82MPa·m1/2.更多还原