Microstructure,Mechanical Properties and Fracture Behavior of WC-40vol%Ni3Al Composites with Various Carbon Contents

摘要：

　　In this paper,the effect of the carbon contents on the microstructure,mechanical properties and fracture behavior of WC-40vol%Ni3Al composites prepared by conventional powder metallurgy was studied.Microstructure examinations of WC-40vol%Ni3Al specimens indicated that the WC grain is round and fine compared with faceted and large WC grain of WC-Co composites.With increasing carbon contents,the WC morphology of WC-40vol%Ni3Al composites is similar and the size of WC grain is approximate and the distribution of binder phase becomes relatively uniform.Furthermore,composition analysis of binding phase showed that,with the increase of carbon content,the solubility of W in Ni3Al reduced slightly.The ~9wt% solubility of W in Ni3Al is much lower compared with ~22.4wt% of WC-40vol%Co composites.The hardness and transverse rupture strength of WC-40vol%Ni3Al composites decrease with increasing carbon contents slightly.WC-40vol%Ni2Al composites present higher hardness and lower transverse rupture strength than that of WC-40vol%Co composites.With increasing carbon contents,the fracture behavior of the WC-40vol%Ni3Al composites is affected greatly and the fracture mode changes from transgranular fracture towards intergranular fracture.

关键词： WC-Ni3Al composites carbon content microstructure mechanical properties

作者: Long Jianzhan Zhang Zhongjian Lu Bizhi

作者单位: State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China;Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou Hunan 412000,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: 122-129

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）