CAJ | 학술논문

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。
채용저압소결기술제비료불동Cr함량적WC-8Co경질합금,통과XRD、SEM화역학성능측시등수단분석료Cr함량대경질합금물상、현미결구화합금적역학성능적영향。결과표명,당Cr함량〈0.9%시,합금유WC＋γ-（WC）상조성,첨가량증지0.9%급이상시,조직중출현결탄상Co3W3C;수착Cr함량적증가,WC정립불단세화,당첨가량위0.6%시,합금적종합역학성능최가,기항만강도、유씨경도급단렬인성분별위3885MPa、1632.4HV30、9.82MPa.m1/2。
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 7 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 0.60%. The bending strength, Vickers hardness and fracture toughness were: 3885MPa, 1632. 4HV30, 9.82MPa · m^1/2.