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<p>Directed energy deposition-arc (DED-arc) has emerged as a very favorable method to produce large parts for its favorable benefits. In this study, a novel economical high-Mn low-Ni duplex stainless steel (DSS) cored wire is developed for DED-arc. The effect of thermal energy on microstructure, mechanical properties, and corrosion resistance of the high-Mn low-Ni DSS single-walled deposited parts under low heat input (LHI) and high heat input (HHI) is investigated. The results indicate that the proportion of austenite increases under high heat input due to the pronounced thermal effect. The lower region of the HHI sample (L-HHI) exhibits a high percentage of austenite, which contributes to superior mechanical properties. The increase in the austenite fraction results in a decrease in microhardness, attributed to the softer nature of the γ phase. Electrochemical results reveal that the L-HHI sample demonstrates superior corrosion resistance, as evidenced by its large charge transfer resistance and low corrosion current density. The high fraction of austenite formed in the L-HHI sample improves the stability of the passive films, thereby exhibiting better corrosion resistance.</p>

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Effect of thermal energy on microstructure, mechanical properties, and corrosion resistance of high-Mn low-Ni duplex stainless steels fabricated via directed energy deposition-arc

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Xiao Chen,
  • Gang Li,
  • Shuainan Song,
  • Ran Tao

摘要

Directed energy deposition-arc (DED-arc) has emerged as a very favorable method to produce large parts for its favorable benefits. In this study, a novel economical high-Mn low-Ni duplex stainless steel (DSS) cored wire is developed for DED-arc. The effect of thermal energy on microstructure, mechanical properties, and corrosion resistance of the high-Mn low-Ni DSS single-walled deposited parts under low heat input (LHI) and high heat input (HHI) is investigated. The results indicate that the proportion of austenite increases under high heat input due to the pronounced thermal effect. The lower region of the HHI sample (L-HHI) exhibits a high percentage of austenite, which contributes to superior mechanical properties. The increase in the austenite fraction results in a decrease in microhardness, attributed to the softer nature of the γ phase. Electrochemical results reveal that the L-HHI sample demonstrates superior corrosion resistance, as evidenced by its large charge transfer resistance and low corrosion current density. The high fraction of austenite formed in the L-HHI sample improves the stability of the passive films, thereby exhibiting better corrosion resistance.