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<p>This study investigated the precipitation behavior of <i>γ</i>′ phase in K417 alloy under different heat treatment processes and established the relationship between the <i>γ</i>′ phase characteristics and mechanical properties. The microstructure and hardness after heat treatment were analyzed by using OM, SEM, EDS, and Vickers hardness test, and the high-temperature tensile test was performed. The results show that the tensile strength of K417 alloy can be enhanced through heat treatment by controlling the morphological characteristics of <i>γ</i>′ phase. After the first heat treatments at 1050°C or 1150°C for 2&#xa0;h followed by secondary heat treatment at 800°C for 8&#xa0;h, the alloy exhibited tensile strengths of 1012&#xa0;MPa and 1049&#xa0;MPa at 900°C, corresponding to 106.3% and 110.2% of its original strength, respectively. K417 alloy's strength is influenced by a higher fraction of <i>γ</i>′ phase with a cuboidal morphology, which corresponds to the alloy's higher tensile strength.</p>

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The Effects of Heat Treatment on Microstructure and Mechanical Properties of K417 Superalloy

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Yubo Sun,
  • Chaoqun Ma,
  • Suteng Zhan

摘要

This study investigated the precipitation behavior of γ′ phase in K417 alloy under different heat treatment processes and established the relationship between the γ′ phase characteristics and mechanical properties. The microstructure and hardness after heat treatment were analyzed by using OM, SEM, EDS, and Vickers hardness test, and the high-temperature tensile test was performed. The results show that the tensile strength of K417 alloy can be enhanced through heat treatment by controlling the morphological characteristics of γ′ phase. After the first heat treatments at 1050°C or 1150°C for 2 h followed by secondary heat treatment at 800°C for 8 h, the alloy exhibited tensile strengths of 1012 MPa and 1049 MPa at 900°C, corresponding to 106.3% and 110.2% of its original strength, respectively. K417 alloy's strength is influenced by a higher fraction of γ′ phase with a cuboidal morphology, which corresponds to the alloy's higher tensile strength.