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

被引：31

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

页码：68 / 73

页数：6

共 29 条

[1]

[Anonymous], 1964, PRINCIPLES SOLIDIFIC

[2]

BOCK A, 1992, POWDER METALL INT, V24, P20

[3] Comparison between microwave and conventional sintering of WC/Co composites [J].

Breval, E ;

Cheng, JP ;

Agrawal, DK ;

Gigl, P ;

Dennis, A ;

Roy, R ;

Papworth, AJ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 391 (1-2) :285-295

[4]

Brieseck M., 2009, EUROPM

[5] Cr-rich layer at the WC/Co interface in Cr-doped WC-Co cermets:: segregation or metastable carbide? [J].

Delanoë, A ;

Bacia, M ;

Pauty, E ;

Lay, S ;

Allibert, CH .

JOURNAL OF CRYSTAL GROWTH, 2004, 270 (1-2) :219-227

[6]

GA H., 1985, B ALLOY PHASE DIAGRA, V6, P1115

[7]

Gibbs J.W., 1928, COLLECTED WORKS J

[8]

Greenwood G.W., 1956, ACTA METALL, V4, P1

[9]

Gurland J., 1963, T METALL SOC AIME, V227, P1

[10] VC, Cr3C2 and NbC doped WC-Co cemented carbides prepared by pulsed electric current sintering [J].

Huang, S. G. ;

Li, L. ;

Vanmeensel, K. ;

Van der Biest, O. ;

Vleuges, J. .

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 2007, 25 (5-6) :417-422

← 1 2 3 →