Analytical modeling to calculate the hardness of ultra-fine WC-Co cemented carbides

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An analytical model to calculate the hardness of ultra-fine WC-10Co cemented carbides was investigated. The nanocrystalline WC-10Co powders were manufactured using a spray conversion process and sintered at 1375 degrees C in a vacuum. Varying amounts of TaC, Cr3C2, and VC were added to nanocrystalline WC-10Co cemented carbides as grain growth inhibitors. The hardness of WC-10Co cemented carbides increased with a decreasing WC grain size from 5 mu m to 300 nm. An analytical model to calculate the hardness of WC-10Co cemented carbides was proposed under the assumption that the applied load is transferred from the WC to the Co binder phase. The analytically calculated hardness showed good agreement with the experimentally measured hardness of WC-10Co cemented carbides. In the proposed analytical model, the hardness of WC-10Co cemented carbides is similar to that predicted by the Hall-Petch relationship when the WC grain size is large. However, when the grain size is finer than a critical value, the predicted hardness of the WC-10Co cemented carbide becomes saturated. (C) 2007 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2008-08
Language
English
Article Type
Article
Keywords

NANOCRYSTALLINE MATERIALS; MECHANICAL-PROPERTIES; TUNGSTEN CARBIDE; MICROSTRUCTURE; ALLOYS; DEFORMATION; TEMPERATURE

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.489, no.1-2, pp.234 - 244

ISSN
0921-5093
DOI
10.1016/j.msea.2007.12.036
URI
http://hdl.handle.net/10203/92881
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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