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<p>This study investigates the effect of different heat treatment processes on the microstructure and mechanical properties of 35CHGSA medium-silicon low-alloy steel. The steel was subjected to direct water quenching (DWQ), conventional quenching and tempering (CQ&amp;T), single quenching and partitioning (SQ&amp;P), and double quenching and partitioning (DQ&amp;P). Advanced characterization techniques, including optical and electron microscopy, electron backscatter diffraction (EBSD), x-ray diffraction (XRD) and mechanical testing, were used to characterize the microstructures and mechanical properties. The results indicate that DQ&amp;P treatment significantly enhances mechanical properties compared to CQ&amp;T by forming a microcomposite structure consisting of carbide-free tempered martensite (CFTM), fresh martensite (FM), carbide-free bainite (CFB) and retained austenite (RA). The strength-ductility product increased from 8.9 to 13.8 GPa.%, and impact energy improved from 19 J to 27 J. The superior toughness of DQ&amp;P-treated steel is attributed to the stabilization of 23% retained austenite as thin and block-shaped films between hard martensite and CFB phases.</p> Graphical Abstract <p></p>

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Enhancing Mechanical Properties of a Medium-Si Low-Alloy Steel via Quenching and Partitioning Treatment

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Ali Khajesarvi,
  • Seyyed Sadegh Ghasemi Banadkouki

摘要

This study investigates the effect of different heat treatment processes on the microstructure and mechanical properties of 35CHGSA medium-silicon low-alloy steel. The steel was subjected to direct water quenching (DWQ), conventional quenching and tempering (CQ&T), single quenching and partitioning (SQ&P), and double quenching and partitioning (DQ&P). Advanced characterization techniques, including optical and electron microscopy, electron backscatter diffraction (EBSD), x-ray diffraction (XRD) and mechanical testing, were used to characterize the microstructures and mechanical properties. The results indicate that DQ&P treatment significantly enhances mechanical properties compared to CQ&T by forming a microcomposite structure consisting of carbide-free tempered martensite (CFTM), fresh martensite (FM), carbide-free bainite (CFB) and retained austenite (RA). The strength-ductility product increased from 8.9 to 13.8 GPa.%, and impact energy improved from 19 J to 27 J. The superior toughness of DQ&P-treated steel is attributed to the stabilization of 23% retained austenite as thin and block-shaped films between hard martensite and CFB phases.

Graphical Abstract