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<p>This study utilizes thermodynamic phase diagram calculations and powder metallurgy techniques to fabricate ultra-coarse WC-8(Co,Ni) cemented carbides with varying Ni:Co ratios. The investigation systematically examines the alloy’s microstructure, mechanical properties, and corrosion resistance. The results demonstrated that thermodynamic phase diagram calculations can effectively maintain carbon balance, thereby preventing the formation of harmful phases associated with carbon deficiency or excess in the alloy. As the Ni:Co ratio increased, the alloy density first increased and then decreased. With the enlargement of the average WC grain size, the Vickers hardness decreased continuously, while the fracture toughness increased steadily. The flexural strength exhibited a trend of first increasing and then significantly decreasing. When the Ni:Co ratio was 2:6, the alloy exhibited optimal comprehensive mechanical properties with a significant improvement in corrosion resistance.</p>

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Utilizing Thermodynamic Phase Diagram Calculations to Study the Effects of Different Ni:Co Ratios on Ultra-Coarse-Grained WC-8(Co,Ni) Cemented Carbides

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Xiaoyu Gu,
  • Zhiping Sun,
  • Zhiming Wang,
  • Shan Gao

摘要

This study utilizes thermodynamic phase diagram calculations and powder metallurgy techniques to fabricate ultra-coarse WC-8(Co,Ni) cemented carbides with varying Ni:Co ratios. The investigation systematically examines the alloy’s microstructure, mechanical properties, and corrosion resistance. The results demonstrated that thermodynamic phase diagram calculations can effectively maintain carbon balance, thereby preventing the formation of harmful phases associated with carbon deficiency or excess in the alloy. As the Ni:Co ratio increased, the alloy density first increased and then decreased. With the enlargement of the average WC grain size, the Vickers hardness decreased continuously, while the fracture toughness increased steadily. The flexural strength exhibited a trend of first increasing and then significantly decreasing. When the Ni:Co ratio was 2:6, the alloy exhibited optimal comprehensive mechanical properties with a significant improvement in corrosion resistance.