文献类型：期刊文献

英文题名：Study on the relation between structural parameters and fracture strength of WC-Co cemented carbides

作者：Liu, Binghai[1,3]; Zhang, Yue[2]; Ouyang, Shixi[3]

机构：[1]E China Univ Sci & Technol, Inst Tech Chem & Phys, Shanghai 200237, Peoples R China;[2]Univ Sci & Technol Beijing, Dept Phys Mat, Beijing 100083, Peoples R China;[3]Wuhan Univ Technol, State Key Lab Synthesis & Proc Adv Mat China, Wuhan 430070, Peoples R China

年份：2000

卷号：62

期号：1

起止页码：35

外文期刊名：MATERIALS CHEMISTRY AND PHYSICS

收录：;EI(收录号：2000125009493);WOS:【SCI-EXPANDED(收录号:WOS:000084492100006)】；

语种：英文

外文关键词：WC-Co cemented carbides; average free path of cobalt binder; critical grain size critical free path of binder; residual thermal stress

摘要：In this article, a directly proportional relation between average free path (M) and ductile deformation energy (y) was proposed, and on the basis of it, a quantitative analysis was conducted for studying the effects of the structural parameters on fracture strength of WC-Co cemented carbides. The results show that, for different WC-Co cemented carbides with different cobalt contents, there exist different critical WC grain size R-c and critical free path of binder M-c. R-c and M-c act as the criteria that determine the growth behavior of crackles. When average free path of cobalt binder M < M-c, or WC grain size R < R-c, crackles will expand mainly across cobalt binder, which will result in intergranular fracture; when M > M-c or R > R-c, transgranular fracture will happen; when M = M-c or R = R-c, concurrence of intergranular fracture and transgranular fracture will take place. R-c and M-c will decrease with increasing of cobalt content, followed by increasing of fracture strength. The dimension of crackles in the circular fissure-breeding district is also a determinative factor to affect fracture strength of cemented carbides. (C) 2000 Elsevier Science S.A. All rights reserved.