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<p>Although the cooling process during the welding thermal cycle has a significant impact on the microstructures and mechanical properties of the welded joint, the influence of the heating process has not yet been thoroughly studied. The main reason is that the heating rate in the actual welding process is related to the heat input, and the specific peak temperature of the welded joint is not constant but gradually decreases from the fusion line to the base material. In this paper, the CGHAZ at different peak temperatures and heating rates was simulated based on 100&#xa0;kJ/cm heat input. The microstructure and low-temperature impact toughness of CGHAZ under different thermal cycling conditions were characterized and analyzed. The results show that the Al-Ti-Mn-O complex inclusion has the potential to induce AF nucleation, while lower peak temperature (1250 °C) and faster heating rate (200 °C/s) are unfavorable. Inclusions, M–A islands and carbides together stimulate the initiation of cracks. The AF cluster hinders the crack propagation mainly because of its high-angle grain boundaries and interlocking microstructure.</p>

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Effects of Peak Temperature and Heating Rate on Simulated High Heat Input Coarse-Grained HAZ in a Low-Carbon Microalloyed High-Strength Steel

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Yulong Yang,
  • Yanping Zeng,
  • Leijun Zhan,
  • Yifeng Xu,
  • Hongbo Gao,
  • Shaolei Liu,
  • Xiao Jia

摘要

Although the cooling process during the welding thermal cycle has a significant impact on the microstructures and mechanical properties of the welded joint, the influence of the heating process has not yet been thoroughly studied. The main reason is that the heating rate in the actual welding process is related to the heat input, and the specific peak temperature of the welded joint is not constant but gradually decreases from the fusion line to the base material. In this paper, the CGHAZ at different peak temperatures and heating rates was simulated based on 100 kJ/cm heat input. The microstructure and low-temperature impact toughness of CGHAZ under different thermal cycling conditions were characterized and analyzed. The results show that the Al-Ti-Mn-O complex inclusion has the potential to induce AF nucleation, while lower peak temperature (1250 °C) and faster heating rate (200 °C/s) are unfavorable. Inclusions, M–A islands and carbides together stimulate the initiation of cracks. The AF cluster hinders the crack propagation mainly because of its high-angle grain boundaries and interlocking microstructure.