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<p>In the overall integrity assessment of welded structural components in hydrogenation reactors, the welded metal was often considered a weak zone due to its uneven microstructure and poor impact toughness. Improving the impact toughness of this zone had become one of the core research topics for improving the service reliability and lifespan of welded structural components. In this study, three weld metals with a as-welded state and two different post-weld heat treatments (PWHT.MIN: 705&#xa0;°C × 8&#xa0;h, PWHT.MAX: 705&#xa0;°C × 32&#xa0;h) were selected. The impact toughness of the weld metals were examined by the Charpy V-notch impact test, while scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) were utilized to evaluate the microstructures of the weld metals. The results indicated that the impact energy of weld metal in the as-welded weld metal is less than 10&#xa0;J, while as-PWHT weld metal significantly improves the impact toughness (PWHT.MIN: 90&#xa0;J, PWHT.MAX: 180&#xa0;J), which is related to the differences in microstructural types and grain orientation spread (GOS). After PWHT, the microstructure transforms from granular bainite to ferrite; PWHT facilitates the full diffusion of alloying elements, promotes grain nucleation and growth, and optimizes GOS, thereby improving the crack resistance and impact toughness of weld metal.</p>

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Effect of Post-Weld Heat Treatment on the Impact Toughness and Microstructure of 2.25Cr-1Mo-0.25 V High-Strength Steel Submerged Arc Welding Weld Metals

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Guishan Dou,
  • Rui Cao,
  • Xiaoli Qiao,
  • Yong Jiang,
  • Yimin Li,
  • Yanwen Tao,
  • Kejing Zhang,
  • Jinmei Li,
  • Cen Wang,
  • Qiaoli Lin,
  • Hongbiao Dong

摘要

In the overall integrity assessment of welded structural components in hydrogenation reactors, the welded metal was often considered a weak zone due to its uneven microstructure and poor impact toughness. Improving the impact toughness of this zone had become one of the core research topics for improving the service reliability and lifespan of welded structural components. In this study, three weld metals with a as-welded state and two different post-weld heat treatments (PWHT.MIN: 705 °C × 8 h, PWHT.MAX: 705 °C × 32 h) were selected. The impact toughness of the weld metals were examined by the Charpy V-notch impact test, while scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) were utilized to evaluate the microstructures of the weld metals. The results indicated that the impact energy of weld metal in the as-welded weld metal is less than 10 J, while as-PWHT weld metal significantly improves the impact toughness (PWHT.MIN: 90 J, PWHT.MAX: 180 J), which is related to the differences in microstructural types and grain orientation spread (GOS). After PWHT, the microstructure transforms from granular bainite to ferrite; PWHT facilitates the full diffusion of alloying elements, promotes grain nucleation and growth, and optimizes GOS, thereby improving the crack resistance and impact toughness of weld metal.