Scholarlink

<p>Correlation of quenching temperature and bulk carbon content with microstructure-properties evolution in Mn-heterogeneous quenching and partitioning (Q&amp;P) steels (0.3C and 0.4C) was systematically investigated. Two critical quenching temperature points were identified where ghost pearlite fraction peaks (70&#xa0;°C for 0.4C, 130&#xa0;°C for 0.3C), with low carbon 0.3C steel displaying a smoother decrease in ghost pearlite fraction due to preferential martensite transformation over coalescence at high quenching temperatures. Compared to 0.4C steel (~ 110&#xa0;°C), superior ductility (22% elongation) across an extended temperature window (130–210&#xa0;°C) was obtained in 0.3C steel, resulting from metastable retained austenite and progressive transformation induced plasticity effects facilitated by lower carbon content. Meanwhile, submicron martensite refinement (120–140&#xa0;nm) in Mn-depleted regions counteracts martensite lath coalescence in conventional low carbon steels, maintaining more pronounced decrease in yield strength (542 <i>vs.</i> 348&#xa0;MPa) in 0.3C steel (with ~ 400&#xa0;nm conventional martensite laths) under the same 80&#xa0;°C quenching temperature variation. The coordinated utilization of chemical heterogeneity with bulk composition design provides an effective pathway to enhance mechanical performance of Q&amp;P steels.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of carbon content on microstructure and mechanical properties of Mn-heterogeneous quenching and partitioning steels

  • 期刊论文

  • 发表日期：

    2026年4月2日

查看全文
  • Chao Zhang,
  • Zhao-Dong Li,
  • Yan-Guang Cao,
  • De-Zhen Yang,
  • Hao Zhang,
  • Xing-Wang Cheng,
  • Zhi-Ping Xiong

摘要

Correlation of quenching temperature and bulk carbon content with microstructure-properties evolution in Mn-heterogeneous quenching and partitioning (Q&P) steels (0.3C and 0.4C) was systematically investigated. Two critical quenching temperature points were identified where ghost pearlite fraction peaks (70 °C for 0.4C, 130 °C for 0.3C), with low carbon 0.3C steel displaying a smoother decrease in ghost pearlite fraction due to preferential martensite transformation over coalescence at high quenching temperatures. Compared to 0.4C steel (~ 110 °C), superior ductility (22% elongation) across an extended temperature window (130–210 °C) was obtained in 0.3C steel, resulting from metastable retained austenite and progressive transformation induced plasticity effects facilitated by lower carbon content. Meanwhile, submicron martensite refinement (120–140 nm) in Mn-depleted regions counteracts martensite lath coalescence in conventional low carbon steels, maintaining more pronounced decrease in yield strength (542 vs. 348 MPa) in 0.3C steel (with ~ 400 nm conventional martensite laths) under the same 80 °C quenching temperature variation. The coordinated utilization of chemical heterogeneity with bulk composition design provides an effective pathway to enhance mechanical performance of Q&P steels.