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<p>In this study, the microstructure and mechanical properties of the as-forged Ni-42&#xa0;W-10Co-1Mo alloy after heat treatment at wide temperatures were investigated. The results indicated that the as-forged alloy consisted of a face-centred cubic (FCC) matrix and a granular σ-phase with an average grain size of 5.3&#xa0;μm. Grain growth occurred with increasing heat treatment temperature, reaching to 20.8&#xa0;μm at 1200&#xa0;°C. Part of the σ-phase transformed into a block-like µ-phase due to the outward element diffusion, at heat treatment temperatures range from 700 to 900&#xa0;°C, and the maximum content of µ-phase located at 900&#xa0;°C. The high tungsten content in the σ-phase resulted in partial dissolution at 1200&#xa0;°C. After heat treatment at 900&#xa0;°C, the yield strength reached a maximum of 932&#xa0;MPa, while its elongation was limited to 6.8%. In contrast, after heat treatment at 1200&#xa0;°C, the elongation was increased to 56.4%, while the yield strength decreased to 505&#xa0;MPa. The µ-phase enhanced the yield strength with stress concentration introduced simultaneously, leading to premature failure and fracture. This study is expected to serve as a significant academic reference for understanding the phase transition behavior of MHAs during heat treatment as well as their strengthening and toughening mechanism.</p>

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Microstructural Evolution and Mechanical Behavior of Ni-42 W-10Co-1Mo Medium-Heavy Alloy Under Wide Temperature Range

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Wannian Wang,
  • Zhanxing Chen,
  • Xinfang Zhang,
  • Xiaohong Wang,
  • Tengfei Ma,
  • Yajun Yin,
  • Jianxin Zhou,
  • Hongze Fang

摘要

In this study, the microstructure and mechanical properties of the as-forged Ni-42 W-10Co-1Mo alloy after heat treatment at wide temperatures were investigated. The results indicated that the as-forged alloy consisted of a face-centred cubic (FCC) matrix and a granular σ-phase with an average grain size of 5.3 μm. Grain growth occurred with increasing heat treatment temperature, reaching to 20.8 μm at 1200 °C. Part of the σ-phase transformed into a block-like µ-phase due to the outward element diffusion, at heat treatment temperatures range from 700 to 900 °C, and the maximum content of µ-phase located at 900 °C. The high tungsten content in the σ-phase resulted in partial dissolution at 1200 °C. After heat treatment at 900 °C, the yield strength reached a maximum of 932 MPa, while its elongation was limited to 6.8%. In contrast, after heat treatment at 1200 °C, the elongation was increased to 56.4%, while the yield strength decreased to 505 MPa. The µ-phase enhanced the yield strength with stress concentration introduced simultaneously, leading to premature failure and fracture. This study is expected to serve as a significant academic reference for understanding the phase transition behavior of MHAs during heat treatment as well as their strengthening and toughening mechanism.