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<p>We report on the precipitation of nitrogen in C-Mn and low-alloy steel welds in the absence of usual nitride-forming elements. We show that ε-M<sub>2-3</sub>(C,N) iron carbonitrides are formed during welding operations, and dissolve upon reheating at around 300&#xa0;°C, resulting in an increase in free nitrogen. Subsequently, post-weld heat treatment performed at around 600&#xa0;°C allows the precipitation of nitrogen as coherent α’’-M<sub>16</sub>N<sub>2</sub> nitrides, enriched in manganese. We propose a transformation sequence to describe the precipitation of nitrides. The presence of Mo in the low-alloy steel welds has two consequences: α’’ nitrides become enriched in Mo, and Mo<sub>2</sub>C carbides are precipitated during post-weld heat treatment. Atom probe tomography and transmission electron microscopy revealed the formation of nitrides formed and confirmed the transformation sequence. This work provides insights on the beneficial role of manganese in the precipitation of free nitrogen in steel welds regarding strain aging sensitivity.</p>

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Precipitation of Manganese Nitride During Post-Weld Heat Treatment in C-Mn and Low-Alloy Steel Welds

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • J. Landes,
  • W. Mottay,
  • K. Hoummada,
  • C. Perrin,
  • V. Massardier,
  • M. Jouiad,
  • N. Hervé,
  • A. Marceaux dit Clément,
  • P. Maugis

摘要

We report on the precipitation of nitrogen in C-Mn and low-alloy steel welds in the absence of usual nitride-forming elements. We show that ε-M2-3(C,N) iron carbonitrides are formed during welding operations, and dissolve upon reheating at around 300 °C, resulting in an increase in free nitrogen. Subsequently, post-weld heat treatment performed at around 600 °C allows the precipitation of nitrogen as coherent α’’-M16N2 nitrides, enriched in manganese. We propose a transformation sequence to describe the precipitation of nitrides. The presence of Mo in the low-alloy steel welds has two consequences: α’’ nitrides become enriched in Mo, and Mo2C carbides are precipitated during post-weld heat treatment. Atom probe tomography and transmission electron microscopy revealed the formation of nitrides formed and confirmed the transformation sequence. This work provides insights on the beneficial role of manganese in the precipitation of free nitrogen in steel welds regarding strain aging sensitivity.