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<p>The investigation focuses on the effects of heat input during laser welding (LW) on the microstructure, mechanical properties, and pitting corrosion resistance of thick-walled duplex stainless steel (DSS) joints. The results indicate that as heat input increases from 0.26 to 0.40&#xa0;kJ/mm, the austenite content in the weld rises from 20.9% to 36.5%, though it remains below the base metal's austenite content of 52.6%. This discrepancy is attributed to the rapid cooling during LW, which promotes excessive ferrite formation. Furthermore, the precipitation of Cr<sub>2</sub>N within the ferrite in the weld zone is progressively suppressed. Ni and Mo exhibit pronounced dendritic segregation in the weld, but the degree of segregation decreases significantly with increased heat input. Compared to the base metal, the weld demonstrates higher microhardness and lower impact toughness due to the imbalanced two-phase ratio and the presence of brittle Cr<sub>2</sub>N. With the increase of heat input, the microhardness of the weld gradually decreases (328.4 → 298.7 HV<sub>0.5</sub>), the impact toughness gradually increases (125.0 → 141.7&#xa0;J/cm<sup>2</sup>), and the pitting corrosion resistance is improved (CPT: 61.3 → 74.7 ℃). These favorable effects are attributed to the increase in heat input, which promotes the increase of austenite content, gradually inhibits the precipitation of Cr<sub>2</sub>N, and reduces the dendrite segregation of elements.</p>

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Microstructure, mechanical properties, and corrosion resistance of DSS laser-welded joints

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Zhiqiang Zhang,
  • Sicheng Qu,
  • Yuhang Zhang,
  • Hongwei Zhang,
  • Xiaochong Lu,
  • Boya Li,
  • Hanxi Li,
  • Tiangang Zhang,
  • Dongquan Wu,
  • Peng Chu,
  • Hongli Liu

摘要

The investigation focuses on the effects of heat input during laser welding (LW) on the microstructure, mechanical properties, and pitting corrosion resistance of thick-walled duplex stainless steel (DSS) joints. The results indicate that as heat input increases from 0.26 to 0.40 kJ/mm, the austenite content in the weld rises from 20.9% to 36.5%, though it remains below the base metal's austenite content of 52.6%. This discrepancy is attributed to the rapid cooling during LW, which promotes excessive ferrite formation. Furthermore, the precipitation of Cr2N within the ferrite in the weld zone is progressively suppressed. Ni and Mo exhibit pronounced dendritic segregation in the weld, but the degree of segregation decreases significantly with increased heat input. Compared to the base metal, the weld demonstrates higher microhardness and lower impact toughness due to the imbalanced two-phase ratio and the presence of brittle Cr2N. With the increase of heat input, the microhardness of the weld gradually decreases (328.4 → 298.7 HV0.5), the impact toughness gradually increases (125.0 → 141.7 J/cm2), and the pitting corrosion resistance is improved (CPT: 61.3 → 74.7 ℃). These favorable effects are attributed to the increase in heat input, which promotes the increase of austenite content, gradually inhibits the precipitation of Cr2N, and reduces the dendrite segregation of elements.