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<p>This study investigates the impact of electropulsing (EP) treatment on the microstructure and tensile properties of aged austenitic low-density duplex steel with a Fe-18Mn-10.5Al-1C-6Ni composition. The base alloy, excluding Mn, is melted at 1600&#xa0;°C via induction heating under vacuum. Mn is later added at 1560&#xa0;°C in argon, and the melt is cast into plates using a copper mold. The cast alloy undergoes homogenization, hot rolling, annealing, and aging to develop B2 phase and κ-carbide within an austenitic matrix, achieving a yield strength of 1224&#xa0;MPa, tensile strength of 1430&#xa0;MPa, and 10.3% plastic elongation. Electropulsing (EP) treatment partially dissolves and spheroidizes coarse B2 and κ-carbides by lowering interfacial energy via electron wind, while simultaneously promoting recrystallization of B2 and austenite below their equilibrium solvus. As a result, B2 is refined with a 2% reduction in volume fraction, and κ-carbide content decreases by 1.5%. Tensile testing indicates a 6% increase in total elongation and a 47% enhancement in tensile toughness, accompanied by a marginal decrease in yield and ultimate tensile strengths. The improved ductility is linked to carbide dissolution, B2 refinement, and a higher proportion of high-angle grain boundaries, while reduced κ-carbide content accounts for the strength decline.</p> Graphical Abstract <p></p>

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Electropulse Assisted Tensile Toughness Improvement in Low Density Austenitic Duplex Steel

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Rajavarapu Pavan Kumar,
  • N. C. Santhi Srinivas,
  • R. Manna

摘要

This study investigates the impact of electropulsing (EP) treatment on the microstructure and tensile properties of aged austenitic low-density duplex steel with a Fe-18Mn-10.5Al-1C-6Ni composition. The base alloy, excluding Mn, is melted at 1600 °C via induction heating under vacuum. Mn is later added at 1560 °C in argon, and the melt is cast into plates using a copper mold. The cast alloy undergoes homogenization, hot rolling, annealing, and aging to develop B2 phase and κ-carbide within an austenitic matrix, achieving a yield strength of 1224 MPa, tensile strength of 1430 MPa, and 10.3% plastic elongation. Electropulsing (EP) treatment partially dissolves and spheroidizes coarse B2 and κ-carbides by lowering interfacial energy via electron wind, while simultaneously promoting recrystallization of B2 and austenite below their equilibrium solvus. As a result, B2 is refined with a 2% reduction in volume fraction, and κ-carbide content decreases by 1.5%. Tensile testing indicates a 6% increase in total elongation and a 47% enhancement in tensile toughness, accompanied by a marginal decrease in yield and ultimate tensile strengths. The improved ductility is linked to carbide dissolution, B2 refinement, and a higher proportion of high-angle grain boundaries, while reduced κ-carbide content accounts for the strength decline.

Graphical Abstract