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<p>The microstructure and mechanical properties of ZGH98M super alloy produced by additive manufacturing are studied. The influence of carbon content at 0.05%, 0.1% and 0.15% was analyzed. Heat treatment process parameters were determined through differential thermal analysis. Transmission electron microscopy results showed that with increasing carbon content, the amount of carbide precipitation increased, growing uniformly at grain boundaries and between dendrites. Multiple carbides existed independently and in interdependence. As the carbon content increased, the characteristic peaks on the heating curve remained almost unchanged, while the solid-phase and liquid-phase transition temperature on the cooling curve is decreased. The dissolution temperature decreases significantly, with the most notable reduction at 0.15% carbon content. As a carbon content of 0.1%, the yield strength, tensile strength, and plasticity all improved. After heat treatment, the material's elongation and cross-sectional shrinkage were significantly increased.</p> Graphical abstract <p></p>

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Effect of carbon content and heat treatment on the tensile properties of additive manufactured superalloys ZGH98M

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Yan Zhao,
  • Yongqi Wang,
  • Jianjun Guan,
  • Mingjun Xie,
  • Yanhong Yang,
  • Wei Gao

摘要

The microstructure and mechanical properties of ZGH98M super alloy produced by additive manufacturing are studied. The influence of carbon content at 0.05%, 0.1% and 0.15% was analyzed. Heat treatment process parameters were determined through differential thermal analysis. Transmission electron microscopy results showed that with increasing carbon content, the amount of carbide precipitation increased, growing uniformly at grain boundaries and between dendrites. Multiple carbides existed independently and in interdependence. As the carbon content increased, the characteristic peaks on the heating curve remained almost unchanged, while the solid-phase and liquid-phase transition temperature on the cooling curve is decreased. The dissolution temperature decreases significantly, with the most notable reduction at 0.15% carbon content. As a carbon content of 0.1%, the yield strength, tensile strength, and plasticity all improved. After heat treatment, the material's elongation and cross-sectional shrinkage were significantly increased.

Graphical abstract