Research into Microstructure of Double Layer Cemented Carbides with Different WC Grain Size

摘要：

　　Sintering under high nitrogen pressure has been applied to prepare functionally graded WC-TiC-Co cemented carbides.The effect of WC grain size on the gradient microstructure has been investigated.The results show that a face center cubic(FCC)rich surface layer formed during nitriding process and the thickness of surface layer decreases as mean WC grain size decreases,showing that there is a constraining effect of ultrafine WC grains on the gradient microstructure formation.The liquid phase migration mechanism of the double layer cemented carbide with various WC grain size is discussed through analyzing the diffusion distance of Ti,N,Co and W.

关键词： Cemented carbides Functionally graded carbides WC Nitrogen Microstructure

作者: Chen Jian Liu Jinyang Ji Hongwei Liu Wei Deng Xin Wu Shanghua

作者单位: School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;Co School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China

会议类型: 国际会议

会议名称: 2018世界粉末冶金大会

会议地点: 北京

会议语种:英文

页码: 826-833

在线出版日期: 2018-09-16（万方平台首次上网日期，不代表论文的发表时间）