COMPUTER SIMULATIONS AND VERIFICATION OF GRADIENT ZONE FORMATION IN CEMENTED CARBIDES
ZHANG Weibin1, SHA Chunsheng1, DU Yong1, WEN Guanghua2, XIE Wen2, WANG Shequan2
1.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083
2.Zhuzhou Cemented Carbide Cutting Tools Limited Company, Zhuzhou 412007
Cite this article:
ZHANG Weibin SHA Chunsheng DU Yong WEN Guanghua XIE Wen WANG Shequan. COMPUTER SIMULATIONS AND VERIFICATION OF GRADIENT ZONE FORMATION IN CEMENTED CARBIDES. Acta Metall Sin, 2011, 47(10): 1307-1314.
Abstract The thermodynamic and kinetic databases for multi–component W–C–Co–Ti–Ta–Nb–N cemented carbides were established. The Thermo–Calc software was used to describe the phase composition of alloys during gradient sintering. Based on the established thermodynamic and kinetic databases, the volume fractions of different phases and elemental concentration profiles in the WC– Ti(C, N)–Co, WC–Ti(C, N)–TaC–Co and WC–Ti(C, N)–NbC–Co alloys were simulated by means of DICTRA software. The simulated results are in good agreement with the experimental data. In order to verify the reliability of the thermodynamic and kinetic databases, a gradiently sintered WC–Ti(C, N)–TaC–NbC–Co cemented carbide has been prepared. SEM and EDS were employed to examinate the microstructure and composition in the gradient zone. The gradient zone formation of the WC– Ti(C, N)–TaC–NbC–Co cemented carbides was then simulated by DICTRA, and the simulation results show a good agreement with the experimental results.
Supported by National Natural Science Foundation of China (No.51028101), National Basic Research Program of China (No.2011CB610401) and Creative Research Group of National Nature Science Foundation of China (No.51021063)
