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Title:: Thermodynamic and diffusion databases for multicomponent cemented carbides and their applications

Author(s):: ZHANG Cong1; 2; ZHANG Weibin1; 2; PENG Yingbiao1; 2; CHEN Weimin1; 2; ZHOUPeng1; 2; LI Na1; 2; CHENG Kaiming1; 2; CHEN Li1; 2; ZHANG Lijun1; 2; LIU Shuhong1; 2; DU Yong1; 2; WANG Shequan3; WEN Guanghua3; XIE Wen3; 1 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

2 Sino-German Cooperation Group “Microstructure”, Central South University, Changsha 410083, China

3 Zhuzhou Cemented Carbide Cutting Tools Limited Company, Zhuzhou, Hunan 412007, PR China

Keywords:: -

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PACS:: -

DOI:: 10.7502/j.issn.1674-3962.2015.01.01

DocumentCode:

Abstract:: Cemented carbides, whichconsist of refractory compounds and binder phase, are produced through powder metallurgy process.They show high hardness, wear resistance, strength with good toughness, heat resistance, corrosion resistance and a series of excellent performance. This paper presents developed thermodynamic and diffusion databases for multicomponent cemented carbides.The databases cover the system C?Co?Cr?W?Ta?Ti?Nb?N.The thermodynamic models and assessments are briefly introduced. The C?Cr?Ta ternary system is shown as an example to describethe procedure of thermodynamic assessment. The diffusion database contains atomic mobility parameters for different diffusing elements in liquid and fcc phases. The atomic mobility parameters in liquid phase are theoretically calculated by the modified Sutherland equation, and atomic mobility parameters in fcc phase are optimized according tothe presently measured diffusivities and the literature data. The developed thermodynamic and diffusion databasescan be used to calculate phase equilibria in multicomponent alloys, simulate the distribution of elements and phases in alloys.Consequently, the databasesare suitable for realizing applications as controlling the alloy composition and sintering temperature, predicting the effect of elements content and sintering atmosphere on the formation of graded cemented carbides, designing and optimizing sintering process for cemented carbides.It is expected that a quantitative description of the relationship between the structure and performancethrougha combination of thermodynamic, diffusion and thermophysical databases with phase field model and finite element method is the main focus for the future development of cemented carbides.

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Thermodynamic and diffusion databases for multicomponent cemented carbides and their applications

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

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