Micro Characteristics of Binder Phases in WC-Co Cemented Carbides with Cr-V and Cr-V-Ln Additives

摘要：

　　Taking the advantage of the large mean free paths of the binder phases,we investigated the effect of Cr-V and Cr-V-Ln (Ln:rare earth) additives on the micro characteristics of the Co-based binder phases (the Cos) in WC-8.4wt%Co cemented carbides with grain sizes larger than 5 μm and narrow two-phase carbon window.It included the crystal structure parameters,composition and morphology.To avoid the interference of WC on the analysis,a method of selective electrolysis corrosion of WC phase was employed.Based on the investigation of the residual Co skeletons,the following facts were established:1) the sole fcc structure; 2) the quite different solution behavior of V and Cr; 3) the significantly suppressed solid solubility of W and significantly increased solid solubility of W+Cr+V and 4) the formation of fine steps on the surfaces.A strong ability of Cr-V and Cr-V-Ln additives in the grain growth inhibition was observed even though an extra coarse WC raw material was used.The relationship among the solid solubility,lattice parameter and strain in/of the Cos,the magnetic saturation and the grain growth inhibition of the alloys were discussed.

关键词： super extra coarse cemented carbide additive cobalt-based binder phase XRD structure parameter solid solubility grain growth inhibition

作者: Zhang Li Xie Mingwei Cheng Xin Nan Qing Wang Zhe Feng Yuping He Yuehui

作者单位: State Key Laboratory of Powder Metallurgy.,Central South University,Changsha 410083,China

会议类型: 国际会议

会议名称: 2012 Zhuzhou International Conference on Cemented Carbides(株洲硬质合金国际学术会议)

会议地点: 株洲

会议语种:英文

页码: 103-113

在线出版日期: 2012-09-12（万方平台首次上网日期，不代表论文的发表时间）