Scholarlink

<p>A FeCoCrNiMo high-entropy alloy (HEA) coating was deposited on alumina-forming austenitic (AFA) steel by laser cladding at varying laser powers. The microstructure, phase composition, and high-temperature wear behavior of the coating at 600&#xa0;°C were systematically characterized and tested. The results show that the HEA coating consists of a face-centered cubic (FCC) matrix with columnar grains and a small amount of <i>σ</i>-phase particles. As the laser power increases from 300 to 540 W, the FCC phase fraction rises from 97.1% to 99.5%, while the <i>σ</i> phase decreases from 2.9% to 0.5%. The average FCC grain size increases from 28.44 μm to 59.14 μm. The coating exhibits its maximum hardness of 647 HV at 300 W, attributed to the combined effects of solid-solution strengthening, <i>σ</i>-phase precipitation hardening, and grain refinement in the FCC matrix. With increasing laser power, grain coarsening and the reduction of the <i>σ</i> phase diminish these strengthening mechanisms, resulting in a decrease in hardness to 466 HV at 540 W. At 300 W, the wear scar is the narrowest and shallowest, corresponding to the lowest wear rate. Although the wear scar width and depth increase with laser power, the HEA coating maintains superior wear resistance compared with the AFA substrate.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of laser power on microstructure and high-temperature tribological property of FeCoCrNiMo HEA coating deposited on alumina-forming austenitic steel

  • 期刊论文

  • 发表日期：

    2025年12月22日

查看全文
  • Yi Cai,
  • Xinlei Li,
  • Yao Xie,
  • Hao Wang,
  • Bo Song,
  • Ning Guo,
  • Shengfeng Guo

摘要

A FeCoCrNiMo high-entropy alloy (HEA) coating was deposited on alumina-forming austenitic (AFA) steel by laser cladding at varying laser powers. The microstructure, phase composition, and high-temperature wear behavior of the coating at 600 °C were systematically characterized and tested. The results show that the HEA coating consists of a face-centered cubic (FCC) matrix with columnar grains and a small amount of σ-phase particles. As the laser power increases from 300 to 540 W, the FCC phase fraction rises from 97.1% to 99.5%, while the σ phase decreases from 2.9% to 0.5%. The average FCC grain size increases from 28.44 μm to 59.14 μm. The coating exhibits its maximum hardness of 647 HV at 300 W, attributed to the combined effects of solid-solution strengthening, σ-phase precipitation hardening, and grain refinement in the FCC matrix. With increasing laser power, grain coarsening and the reduction of the σ phase diminish these strengthening mechanisms, resulting in a decrease in hardness to 466 HV at 540 W. At 300 W, the wear scar is the narrowest and shallowest, corresponding to the lowest wear rate. Although the wear scar width and depth increase with laser power, the HEA coating maintains superior wear resistance compared with the AFA substrate.