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<p>This study investigates the microstructural evolution and mechanical property changes in the heat-affected zone (HAZ) of welded S960MC advanced high-strength steel (AHSS). The main objective was to evaluate the influence of welding thermal cycles on the microstructure and mechanical properties of different HAZ subzones, including the subcritical heat-affected zone (SCHAZ), intercritical heat-affected zone (ICHAZ), and fully transformed subzones (FGHAZ, CGHAZ, and FZ). Real welds were performed on 3&#xa0;mm thick S960MC steel with metal-cored arc welding (MCAW), and thermal cycles specific to each subzone were simulated to study the resulting microstructures. Microhardness and tensile testing were conducted, and microstructural characterization was performed using electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and visual light microscopy (VLM). The SCHAZ exhibited carbide precipitation within the martensitic structure, resulting in a mixture of tempered martensite and bainite, with a smooth decrease in microhardness from 330 HV0.5 to 269 HV0.5. The ICHAZ, exposed to temperatures between A<sub>c1</sub> and A<sub>c3</sub>, underwent partial austenitization, followed by transformation into a mixture of ferrite, bainite, and martensite, with a significant reduction in microhardness to 234 HV0.5 at its center. The fully transformed subzones showed grain coarsening, with microhardness varying from 284 HV0.5 in the CGHAZ to 319 HV0.5 in the FGHAZ and decreasing to 276 HV0.5 in the fusion zone. The ICHAZ was identified as the most critical subzone, exhibiting the highest susceptibility to mechanical failure.</p>

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Microstructure evolution in the heat affected zone of the S960MC weld joint

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月14日

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  • Denisa Strakova,
  • Michal Jambor,
  • Frantisek Novy,
  • Libor Trsko

摘要

This study investigates the microstructural evolution and mechanical property changes in the heat-affected zone (HAZ) of welded S960MC advanced high-strength steel (AHSS). The main objective was to evaluate the influence of welding thermal cycles on the microstructure and mechanical properties of different HAZ subzones, including the subcritical heat-affected zone (SCHAZ), intercritical heat-affected zone (ICHAZ), and fully transformed subzones (FGHAZ, CGHAZ, and FZ). Real welds were performed on 3 mm thick S960MC steel with metal-cored arc welding (MCAW), and thermal cycles specific to each subzone were simulated to study the resulting microstructures. Microhardness and tensile testing were conducted, and microstructural characterization was performed using electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and visual light microscopy (VLM). The SCHAZ exhibited carbide precipitation within the martensitic structure, resulting in a mixture of tempered martensite and bainite, with a smooth decrease in microhardness from 330 HV0.5 to 269 HV0.5. The ICHAZ, exposed to temperatures between Ac1 and Ac3, underwent partial austenitization, followed by transformation into a mixture of ferrite, bainite, and martensite, with a significant reduction in microhardness to 234 HV0.5 at its center. The fully transformed subzones showed grain coarsening, with microhardness varying from 284 HV0.5 in the CGHAZ to 319 HV0.5 in the FGHAZ and decreasing to 276 HV0.5 in the fusion zone. The ICHAZ was identified as the most critical subzone, exhibiting the highest susceptibility to mechanical failure.