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<p>Laser-arc hybrid welding of thick 12Cr13 martensitic stainless steel was carried out, and the effects of the root face thickness on the weld formation, microstructure, and mechanical properties were investigated. The results showed that the pores formed with the root face thickness achieving 6&#xa0;mm, while the cracks were observed at the thickness of 8&#xa0;mm, and could be eliminated by preheating at 200&#xa0;°C. With the thickness increasing from 4 to 8&#xa0;mm, the average grain size at the root face decreased from 191 to 150&#xa0;μm, the fraction of high angle grain boundaries increased from 48 to 77%, and the fraction of Σ3 CSL boundaries increased from 0.1 to 3.1%. The tensile properties at the root face were greatly affected by the pores. With the thickness increasing from 4 to 8&#xa0;mm, the ultimate tensile strength decreased from 646 to 615&#xa0;MPa, the yield strength decreased from 501 to 475&#xa0;MPa, and the elongation rate decreased from 21 to 18%. It is worth noting that a strong linear relationship between the average grain size and the energy density was found at the root face.</p> Graphical Abstract <p></p>

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The Effect of Root Face Thickness on Microstructure Evolution and Tensile Properties of Laser-Arc Hybrid Welded Thick 12Cr13 Martensitic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Yu Fu,
  • Lianyong Xu,
  • Kangda Hao,
  • Yao Shi,
  • Qian Li,
  • Haicun Zhang,
  • Yongdian Han,
  • Lei Zhao,
  • Wenjing Ren

摘要

Laser-arc hybrid welding of thick 12Cr13 martensitic stainless steel was carried out, and the effects of the root face thickness on the weld formation, microstructure, and mechanical properties were investigated. The results showed that the pores formed with the root face thickness achieving 6 mm, while the cracks were observed at the thickness of 8 mm, and could be eliminated by preheating at 200 °C. With the thickness increasing from 4 to 8 mm, the average grain size at the root face decreased from 191 to 150 μm, the fraction of high angle grain boundaries increased from 48 to 77%, and the fraction of Σ3 CSL boundaries increased from 0.1 to 3.1%. The tensile properties at the root face were greatly affected by the pores. With the thickness increasing from 4 to 8 mm, the ultimate tensile strength decreased from 646 to 615 MPa, the yield strength decreased from 501 to 475 MPa, and the elongation rate decreased from 21 to 18%. It is worth noting that a strong linear relationship between the average grain size and the energy density was found at the root face.

Graphical Abstract