Microstructure and composition of segregation layers at WC/Co interfaces in ultrafine-grained cemented carbides co-doped with Cr and V

被引：28
|
作者：
Guo, Weiteng [1 ,2 ,3 ,4 ]
Li, Kai [1 ,3 ]
Du, Yong [1 ,3 ]
Zhang, Zhongjian [2 ]
Xu, Tao [2 ]
Yin, Chao [2 ]
Zhang, Zhuo [3 ]
Thou, Peng [1 ]
Liu, Xiangzhong [2 ]
Huang, Baiyun [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
[2] State Key Lab Cemented Carbide, Zhuzhou 412000, Hunan, Peoples R China
[3] Cent S Univ, Inst Mat Microstruct, Changsha 410083, Hunan, Peoples R China
[4] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2016年 / 58卷
基金：
中国国家自然科学基金;
关键词：
Cemented carbides; Interface structure; High-resolution electron microscopy (HRTEM); High-angle annular dark field (HAADF); Energy dispersive X-ray spectroscopy (EDXS); WC-CO; CERMETS; CR3C2; MICROSCOPY; (W; V)C-X; ALLOY; FILMS;
D O I：
10.1016/j.ijrmhm.2016.04.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
VC-Cr3C2 is the most widely used grain growth inhibitor for ultrafine-grained cemented carbides. However, the mechanism for the high effectiveness of this inhibitor is still unclear. This work aims to clarify the inhibiting mechanism involving VC-Cr3C2 inhibitor through investigations of a commercial ultrafine-grained WC-Co-VC-Cr3C2 cemented carbide in an objective-aberration-corrected transmission electron microscope. Our results show that continuous segregation layers enveloping WC grains [(V,W,Cr)C-x on (0001)(WC) basal facets and (Cr,W,V)C on {10 (1) over bar0}(WC) prismatic facets] account for the high effectiveness of VC-Cr3C2 inhibitor. Especially, the newly observed continuous and coherent (Cr,W,V)C layers on {10 (1) over bar0}(WC) prismatic facets give an explanation for the superiority of VC-Cr3C2 inhibitor compared with VC inhibitor. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：68 / 73
页数：6
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