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<p>The study explored how varying carbon content (0.2-2&#xa0;wt.% C) affects the microstructure and mechanical properties of carbide reinforced Ni-Co-Cr-Mo alloy matrix composites, which were produced via hot isostatic pressing. Thermal Calc simulations predicted the carbide precipitation sequence as V<sub>2</sub>C, Cr<sub>23</sub>C<sub>6</sub>, and Ni<sub>3</sub>Mo<sub>3</sub>C. However, experimental observations revealed the actual sequence to be Ni<sub>3</sub>Mo<sub>3</sub>C, Cr<sub>23</sub>C<sub>6</sub>, and V<sub>2</sub>C. As carbon content increased, the Vickers hardness and yield strength of the alloy rise from 319 HV and 698&#xa0;MPa to 559 HV and 1335&#xa0;MPa, respectively, primarily due to microstructural refinement. Conversely, the compressive strain decreased from 45 to 20% with higher carbon content, attributed to carbide agglomeration and the presence of primary particle boundaries.</p>

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Effect of C Content on Microstructure and Mechanical Performance of Carbide Reinforced Ni-Co-Cr-Mo Matrix Composites

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Chao Li,
  • Ziming Zeng,
  • Jianwei Teng,
  • Xiaojuan Gong,
  • Yunping Li

摘要

The study explored how varying carbon content (0.2-2 wt.% C) affects the microstructure and mechanical properties of carbide reinforced Ni-Co-Cr-Mo alloy matrix composites, which were produced via hot isostatic pressing. Thermal Calc simulations predicted the carbide precipitation sequence as V2C, Cr23C6, and Ni3Mo3C. However, experimental observations revealed the actual sequence to be Ni3Mo3C, Cr23C6, and V2C. As carbon content increased, the Vickers hardness and yield strength of the alloy rise from 319 HV and 698 MPa to 559 HV and 1335 MPa, respectively, primarily due to microstructural refinement. Conversely, the compressive strain decreased from 45 to 20% with higher carbon content, attributed to carbide agglomeration and the presence of primary particle boundaries.