摘要
本文以粗、中、纳米颗粒WC为原料,采用粉末冶金方法制备了不同Cr_(3)C_(2)/CrN复合添加剂含量的WC-10%Co非均匀结构硬质合金,并研究了Cr_(3)C_(2)/CrN复合添加剂对硬质合金微观组织结构和性能的影响。结果表明:随着Cr_(3)C_(2)/CrN复合添加剂含量增加,WC晶粒被抑制效果越显著,合金硬度呈递增趋势,抗弯强度则先增加后减小。当Cr_(3)C_(2)/CrN复合添加剂含量为1%时,合金综合性能最佳,维氏硬度达到1270HV_(3),抗弯强度达到2880MPa。复合添加剂增强作用机理主要是因为复合添加剂溶解在液相Co中,降低了WC在Co相中的溶解度,减缓WC溶解-析出过程,抑制了WC晶粒聚晶和异常长大现象,并起到固溶强化和弥散强化的作用,有效提升了合金综合性能。
WC-10%Co non-uniform structure cemented carbides with different Cr_(3)C_(2)/CrN composite additive contents were prepared by powder metallurgy method with coarse,medium and nanoparticles WC as raw materials.The effects of Cr_(3)C_(2)/CrN composite additives on the microstructure and properties of cemented carbides were investigated.The results show that:with the increase of Cr_(3)C_(2)/CrN composite additive content,the WC grain is significantly suppressed.The hardness of the alloy shows an increasing trend,and the flexural strength increases and then decreases.When the content of Cr_(3)C_(2)/CrN composite additive is 1%,the alloy has a maximum comprehensive performance,with the Vickers hardness and flexural strength reaching 1270 HV_(3) and 2880 MPa respectively.The composite additive enhancement mechanism is mainly because the composite additive is dissolved in the liquid phase Co,which reduces the solubility of WC in the Co phase.With the slowing down the WC dissolution-precipitation process,it inhibits the WC grain polycrystallization and abnormal growth phenomenon.Therefore,it plays the role of solid solution strengthening and dispersion strengthening to enhance the alloy's overall performance effectively.
作者
陈玉柏
徐伟
王燕飞
夏康
何翕
肖颖奕
杨树忠
汤昌仁
CHEN Yubo;XU Wei;WANG Yanfei;XIA Kang;HE Xi;XIAO Yingyi;YANG Shuzhong;TANG Changren(Ganzhou Nonferrous Metallurgy Research Institute Co.,Ltd.,Ganzhou 341000,Jiangxi,China;Jiangxi Jiangwu Cemented Carbide Co.,Ltd.,Jingan 330699,Jiangxi,China;High-tech Special Materials of Tungsten and Rare Earth of Technology Innovation Center of Jiangxi Province,Ganzhou 341000,Jiangxi,China)
出处
《中国钨业》
CAS
2023年第5期18-24,52,共8页
China Tungsten Industry
基金
江西省重大科技研发专项(20194ABC28004)
江钨控股集团科技重大专项(JWGF-18ZD-01)。
