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<p>In this study, the effect of solution temperature on the microstructure and mechanical properties of a CoNi-based superalloy manufactured by selective laser melting (SLM) was studied. The results revealed that the as-printed alloy mainly consisted of columnar grains along the building direction, with approximately 0.1&#xa0;pct porosity, and abundant MC carbides precipitated along grain/sub-grain boundaries. After sub-solvus solution treatment at 1020&#xa0;°C and 1080&#xa0;°C, the columnar grains and MC carbides distribution were retained, while the density of dislocations and sub-grain boundaries was decreased with increasing temperature. In contrast, the columnar grains transformed into equiaxed grains by super-solvus solution treatment at 1200&#xa0;°C, while the density of dislocations and sub-grain boundaries was significantly reduced and MC carbides were primarily located within grains. The SLMed CoNi-based superalloy demonstrated a good balance of strength and ductility at room temperature, comparable to that of existing <i>γ</i>′-strengthened Ni/CoNi-based superalloys. Moreover, owing to MC carbides along grain/sub-grain boundaries after sub-solvus solution treatment, the alloy showed superior comprehensive mechanical properties at 850&#xa0;°C. This work provides valuable insights for tailoring the microstructure and mechanical properties of SLMed CoNi-based superalloys.</p>

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Improvement of Mechanical Properties in a CoNi-Based Superalloy Fabricated by Selective Laser Melting Through Optimized Heat Treatment

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Chunlei Yan,
  • Song Lu,
  • Longfel Li,
  • Qiang Feng

摘要

In this study, the effect of solution temperature on the microstructure and mechanical properties of a CoNi-based superalloy manufactured by selective laser melting (SLM) was studied. The results revealed that the as-printed alloy mainly consisted of columnar grains along the building direction, with approximately 0.1 pct porosity, and abundant MC carbides precipitated along grain/sub-grain boundaries. After sub-solvus solution treatment at 1020 °C and 1080 °C, the columnar grains and MC carbides distribution were retained, while the density of dislocations and sub-grain boundaries was decreased with increasing temperature. In contrast, the columnar grains transformed into equiaxed grains by super-solvus solution treatment at 1200 °C, while the density of dislocations and sub-grain boundaries was significantly reduced and MC carbides were primarily located within grains. The SLMed CoNi-based superalloy demonstrated a good balance of strength and ductility at room temperature, comparable to that of existing γ′-strengthened Ni/CoNi-based superalloys. Moreover, owing to MC carbides along grain/sub-grain boundaries after sub-solvus solution treatment, the alloy showed superior comprehensive mechanical properties at 850 °C. This work provides valuable insights for tailoring the microstructure and mechanical properties of SLMed CoNi-based superalloys.