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<p>The influence of welding heat input on the microstructure and mechanical performance of 20-mm-thick S500MC steel joints produced by laser-arc hybrid welding was systematically investigated. The weld zone microstructure is side-plate ferrite and Widmanstatten structures under high heat input, pearlite under medium heat input, and side-plate ferrite under low heat input. Increasing heat input reduced the tendency for columnar grain formation. Meanwhile, in the coarse-grain heat-affected zone (CGHAZ), the dominant microstructures were upper bainite at high heat input, lower bainite at medium heat input, and polygonal ferrite at low heat input accompanied by a shift in grain boundary misorientation from low-angle grain boundaries to middle-angle grain boundaries. Although the crystallographic characteristics of both the weld metal and the HAZ were optimized, the low-temperature impact energy for both the weld zone and HAZ followed the order: high heat input &lt; low heat input &lt; medium heat input.</p>

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Microstructural Evolution and Mechanical Properties of Laser-arc Hybrid Multi-layer Welded S500MC Steel Joints with Different Heat Inputs

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Dongzhe Song,
  • Cheng Jin,
  • Yaping Wang,
  • Jin Peng,
  • Song Chen,
  • Zhibin Yang

摘要

The influence of welding heat input on the microstructure and mechanical performance of 20-mm-thick S500MC steel joints produced by laser-arc hybrid welding was systematically investigated. The weld zone microstructure is side-plate ferrite and Widmanstatten structures under high heat input, pearlite under medium heat input, and side-plate ferrite under low heat input. Increasing heat input reduced the tendency for columnar grain formation. Meanwhile, in the coarse-grain heat-affected zone (CGHAZ), the dominant microstructures were upper bainite at high heat input, lower bainite at medium heat input, and polygonal ferrite at low heat input accompanied by a shift in grain boundary misorientation from low-angle grain boundaries to middle-angle grain boundaries. Although the crystallographic characteristics of both the weld metal and the HAZ were optimized, the low-temperature impact energy for both the weld zone and HAZ followed the order: high heat input < low heat input < medium heat input.