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<p>This study systematically investigates the impact of partitioning temperature and time on the microstructure and mechanical properties of a medium-Mn low-density quenching and partitioning (Q&amp;P) steel. First, the constrained carbon equilibrium (CCE) model and <i>T</i><sub>0</sub> calculations define an optimal quenching temperature (190&#xa0;°C) and partitioning window (285-482&#xa0;°C) to stabilize carbon-enriched retained austenite (RA). Second, varying partitioning parameters reveal that rational pairing of partitioning temperature and time enables precise control over carbon diffusion kinetics and RA stability. The&#xa0;350&#xa0;°C/180&#xa0;s&#xa0;treatment delivers an optimal strength-ductility balance (31.13 GPa·%). Third, detailed characterizations of this optimal process confirm a multi-phase microstructure with&#xa0;15.5% RA. Quantitative analysis of tensile deformation demonstrates a strain-dependent transformation-induced plasticity (TRIP) effect, where&#xa0;22%&#xa0;of total elongation originated from the progressive transformation of RA. This work provides a validated process window and mechanistic insight into RA stability for high-performance Q&amp;P steel design.</p>

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Evolution of Retained Austenite in Medium-Mn Quenching and Partitioning Steel and Its Transformation-Induced Plasticity Effect

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Hongquan Wang,
  • Junqing Wang,
  • Chunmei Feng,
  • Jun Yang

摘要

This study systematically investigates the impact of partitioning temperature and time on the microstructure and mechanical properties of a medium-Mn low-density quenching and partitioning (Q&P) steel. First, the constrained carbon equilibrium (CCE) model and T0 calculations define an optimal quenching temperature (190 °C) and partitioning window (285-482 °C) to stabilize carbon-enriched retained austenite (RA). Second, varying partitioning parameters reveal that rational pairing of partitioning temperature and time enables precise control over carbon diffusion kinetics and RA stability. The 350 °C/180 s treatment delivers an optimal strength-ductility balance (31.13 GPa·%). Third, detailed characterizations of this optimal process confirm a multi-phase microstructure with 15.5% RA. Quantitative analysis of tensile deformation demonstrates a strain-dependent transformation-induced plasticity (TRIP) effect, where 22% of total elongation originated from the progressive transformation of RA. This work provides a validated process window and mechanistic insight into RA stability for high-performance Q&P steel design.