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The current study investigates the physics governing the improvement in joint strength in solution-treated (ST) Hastelloy X (HX) weld specimens fabricated using the resistance spot welding (RSW) process. Due to its unique composition, HX, prominent for its high-temperature strength and oxidation resistance, poses challenges in achieving robust weld joints. This study investigates the influence of solution treatment on the joint properties of these weldments through a comprehensive analysis of the underlying physical mechanisms. The HX weldments are solution-treated at 1177 °C and soaked for 2 h as post-weld heat treatment (PWHT). The outcome of PWHT has led to enhancement in the tensile properties of the joints, including load-bearing capacity (LBC) and tensile-shear strength, by 43.48 and 45.91%, respectively. This improvement is associated with the elimination of the σ phase and dissolution of M6C carbides. Further, the growth of Cr-rich precipitates at the grain boundary resists dislocation motion and strengthens the material.

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Physical Phenomena Behind the Enhancement of Joint Properties in Solution-Treated Nickel-Based Superalloy

  • 会议论文

  • 发表日期：

    2025年

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  • Swagat Dwibedi,
  • Nilakantha Sahu,
  • Suyog Jhavar

摘要

The current study investigates the physics governing the improvement in joint strength in solution-treated (ST) Hastelloy X (HX) weld specimens fabricated using the resistance spot welding (RSW) process. Due to its unique composition, HX, prominent for its high-temperature strength and oxidation resistance, poses challenges in achieving robust weld joints. This study investigates the influence of solution treatment on the joint properties of these weldments through a comprehensive analysis of the underlying physical mechanisms. The HX weldments are solution-treated at 1177 °C and soaked for 2 h as post-weld heat treatment (PWHT). The outcome of PWHT has led to enhancement in the tensile properties of the joints, including load-bearing capacity (LBC) and tensile-shear strength, by 43.48 and 45.91%, respectively. This improvement is associated with the elimination of the σ phase and dissolution of M6C carbides. Further, the growth of Cr-rich precipitates at the grain boundary resists dislocation motion and strengthens the material.