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<p>GH4061, a highly alloyed nickel-base superalloy with superior high temperature mechanical properties, poses significant processing challenges. Additive manufacturing, minimizing machining via direct shaping, holds significant promise for promoting the formability of GH4061. The present study focuses on the optimization of selective laser melting and heat treatment parameters for GH4061. The microstructural characterization results demonstrate that the highest relative density is achieved at a laser input energy density of 83.33 J/mm<sup>3</sup>. Homogenization treatment at 1150&#xa0;°C for 1 h ensures full recrystallisation, while the chemical segregation vanishes after 1 h holding at 1050&#xa0;°C. Mechanical tests demonstrate that the cellular sub-grains without chemical segregation have small influence on the yield strength. These findings about the contribution of cellular sub-grains are highly valuable for optimizing the microstructures of additively manufactured alloys.</p> Graphical abstract <p></p>

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Optimization of processing and heat treatment parameters of highly alloyed GH4061 fabricated by selective laser melting

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Hongwei Qi,
  • Fangchen Liu,
  • Jin Huang,
  • Jiasheng Liu,
  • Xinbo He,
  • Guohua Xu,
  • Yang Liu,
  • Lei Wang,
  • Zhou Zhou,
  • Fanqiang Meng

摘要

GH4061, a highly alloyed nickel-base superalloy with superior high temperature mechanical properties, poses significant processing challenges. Additive manufacturing, minimizing machining via direct shaping, holds significant promise for promoting the formability of GH4061. The present study focuses on the optimization of selective laser melting and heat treatment parameters for GH4061. The microstructural characterization results demonstrate that the highest relative density is achieved at a laser input energy density of 83.33 J/mm3. Homogenization treatment at 1150 °C for 1 h ensures full recrystallisation, while the chemical segregation vanishes after 1 h holding at 1050 °C. Mechanical tests demonstrate that the cellular sub-grains without chemical segregation have small influence on the yield strength. These findings about the contribution of cellular sub-grains are highly valuable for optimizing the microstructures of additively manufactured alloys.

Graphical abstract