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<p>This study implemented a novel quenching and partitioning (Q&amp;P) process on 301 stainless steel, systematically investigating the effects of partitioning temperature on microstructure and mechanical properties using OM, SEM, TEM, XRD, and tensile testing. The Q&amp;P-treated steel exhibits a dual-phase microstructure of retained austenite and martensite. Maximum retained austenite content (31&#xa0;vol.%) was achieved at a partitioning temperature of 400&#xa0;°C. Ultimate tensile strength progressively increased with partitioning temperature from 300 to 500&#xa0;°C, while yield strength increased from 450 to 515&#xa0;MPa. Total elongation peaked at 34% after partitioning at 400&#xa0;°C. This exceptional ductility is attributed to enhanced transformation-induced plasticity effects enabled by substantial retained austenite, improving strain compatibility. The superior yield strength at 500&#xa0;°C arises from precipitation hardening due to carbide formation. This investigation demonstrates that Q&amp;P processing effectively optimizes microstructure and enhances mechanical properties in 301 stainless steels through controlled phase transformation and precipitation engineering.</p>

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Effect of Quenching and Partitioning Treatment on Microstructure and Mechanical Properties of 301 Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Sha Wang,
  • Jinshang Ni

摘要

This study implemented a novel quenching and partitioning (Q&P) process on 301 stainless steel, systematically investigating the effects of partitioning temperature on microstructure and mechanical properties using OM, SEM, TEM, XRD, and tensile testing. The Q&P-treated steel exhibits a dual-phase microstructure of retained austenite and martensite. Maximum retained austenite content (31 vol.%) was achieved at a partitioning temperature of 400 °C. Ultimate tensile strength progressively increased with partitioning temperature from 300 to 500 °C, while yield strength increased from 450 to 515 MPa. Total elongation peaked at 34% after partitioning at 400 °C. This exceptional ductility is attributed to enhanced transformation-induced plasticity effects enabled by substantial retained austenite, improving strain compatibility. The superior yield strength at 500 °C arises from precipitation hardening due to carbide formation. This investigation demonstrates that Q&P processing effectively optimizes microstructure and enhances mechanical properties in 301 stainless steels through controlled phase transformation and precipitation engineering.