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<p>In this study, WC-20Co cemented carbides with different Co phases were obtained via heat treatment. The microstructure, mechanical properties, and wear behavior of TiAlN coatings deposited on WC-20Co substrate before and after heat treatment were investigated. The results revealed that the heat treatment enhanced W content in the binder phase, reduced volume and adjacency of the WC grains, and changed the ratio of fcc-Co/hcp-Co in the WC-20Co cemented carbide from 81.4:18.6 to 99.7:0.3. The treatment results in a reduction in hardness and an increase in TRS in cemented carbides. The TiAlN coating on the substrate before and after heat treatment exhibited growth rates comparable to of those (111), (200), and (220) preferred orientations. The treatment of substrate results in an increased the adhesion strength of the TiAlN coating from 14.2 to 15.7&#xa0;N and decreased its nanohardness from 31.6 to 27.5&#xa0;GPa. The higher adhesion strength can be attributed to the reduction the ratio of hcp-Co and the enhanced the WC contents in the Co binder after heat treatment. The TC4 wear test indicated that the TiAlN coating on before and after heat treatment substrate had similar friction coefficient of ~ 0.7. Compared to TiAlN coating without heat treatment, the heat-treated TiAlN coating exhibited better TC4 wear resistance owing to its enhanced adhesion strength.</p>

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Effect of Heat Treatment on Wear Resistance of WC-Co and TiAlN-Coated Cemented Carbides

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • J. Y. Yi,
  • Y. C. Xu,
  • J. H. Yan,
  • Y. Liu,
  • Y. J. Zhou

摘要

In this study, WC-20Co cemented carbides with different Co phases were obtained via heat treatment. The microstructure, mechanical properties, and wear behavior of TiAlN coatings deposited on WC-20Co substrate before and after heat treatment were investigated. The results revealed that the heat treatment enhanced W content in the binder phase, reduced volume and adjacency of the WC grains, and changed the ratio of fcc-Co/hcp-Co in the WC-20Co cemented carbide from 81.4:18.6 to 99.7:0.3. The treatment results in a reduction in hardness and an increase in TRS in cemented carbides. The TiAlN coating on the substrate before and after heat treatment exhibited growth rates comparable to of those (111), (200), and (220) preferred orientations. The treatment of substrate results in an increased the adhesion strength of the TiAlN coating from 14.2 to 15.7 N and decreased its nanohardness from 31.6 to 27.5 GPa. The higher adhesion strength can be attributed to the reduction the ratio of hcp-Co and the enhanced the WC contents in the Co binder after heat treatment. The TC4 wear test indicated that the TiAlN coating on before and after heat treatment substrate had similar friction coefficient of ~ 0.7. Compared to TiAlN coating without heat treatment, the heat-treated TiAlN coating exhibited better TC4 wear resistance owing to its enhanced adhesion strength.