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<p>In this paper, the effect of the welding heat input on the microstructure and impact properties of an automotive beam steel were studied. The research found that when the heat input increases from 20 to 50&#xa0;KJ/cm, the coarse grained heat affected zone (CGHAZ) of the steel gradually transform from lath bainite to acicular ferrite and granular bainite, and when the heat input continue increased to 60&#xa0;KJ/cm, the acicular ferrite content in the CGHAZ significantly reduced, and the granular bainite content increased correspondingly. The − 20&#xa0;°C impact toughness test found that with the heat input increases from 20 to 50&#xa0;KJ/cm, the impact absorbed energy of the automotive beam steel steadily increasing, and when the heat input continues to increase to 60&#xa0;KJ/cm, the impact toughness of the steel suddenly decreased. Analysis suggests that when the heat input increases from 20 to 50&#xa0;KJ/cm, the increase in the impact absorbed energy for the steel is due to the increased content of the acicular ferrite, the lower solid solubility of C atom in acicular ferrite increases the deformation ability of steel, and when the heat input increased to 60&#xa0;KJ/cm, the lower impact absorbed energy of steel is due to the formation of granular bainite, and the brittle and hard M-A constituent in the granular bainite promote the initiation and propagation of cracks, thereby reducing deformation ability of steel.</p>

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The Influence of Welding Heat Input on the Impact Performance of an Automotive Beam Steel

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Hailong Yi,
  • Dianshuang Wu,
  • Shaohua Liu,
  • Jiwen Cheng,
  • Jinhua Zhou,
  • Yifu Jiang,
  • Lu Zhao

摘要

In this paper, the effect of the welding heat input on the microstructure and impact properties of an automotive beam steel were studied. The research found that when the heat input increases from 20 to 50 KJ/cm, the coarse grained heat affected zone (CGHAZ) of the steel gradually transform from lath bainite to acicular ferrite and granular bainite, and when the heat input continue increased to 60 KJ/cm, the acicular ferrite content in the CGHAZ significantly reduced, and the granular bainite content increased correspondingly. The − 20 °C impact toughness test found that with the heat input increases from 20 to 50 KJ/cm, the impact absorbed energy of the automotive beam steel steadily increasing, and when the heat input continues to increase to 60 KJ/cm, the impact toughness of the steel suddenly decreased. Analysis suggests that when the heat input increases from 20 to 50 KJ/cm, the increase in the impact absorbed energy for the steel is due to the increased content of the acicular ferrite, the lower solid solubility of C atom in acicular ferrite increases the deformation ability of steel, and when the heat input increased to 60 KJ/cm, the lower impact absorbed energy of steel is due to the formation of granular bainite, and the brittle and hard M-A constituent in the granular bainite promote the initiation and propagation of cracks, thereby reducing deformation ability of steel.