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<p>This study investigates the decomposition of retained austenite (RA) in tool steels for plastic molding in correlation with the alloy chemical composition and the tempering parameters. Two grades differing in their silicon content with initial mixed bainitic/martensitic microstructures were investigated using <i>in situ</i> synchrotron high-energy X-ray diffraction (HEXRD) during tempering in the 550&#xa0;°C to 600&#xa0;°C temperature range for one-hour holding time. Results indicated carbide formation during heating or isothermal holding; however, retained austenite remained untransformed up to the end of the tempering holding time in all investigated conditions for both grades. <i>In situ</i> HEXRD provides direct evidence of the transformation of retained austenite into fresh martensite on cooling from the tempering stage. This behavior is correlated to the evolution of carbon enrichment of retained austenite and the effect of silicon is discussed.</p>

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In Situ Monitoring of Retained Austenite Decomposition During Tempering of High-Strength Tool Steels

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月19日

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  • Myriam Dumont,
  • Maha Messaadi Ben Said,
  • Marine Lachal,
  • David Quidort,
  • Maxime Perruchot,
  • Benoît Malard,
  • Norbert Schell,
  • Emad Maawad,
  • Denis Delagnes,
  • Moukrane Dehmas

摘要

This study investigates the decomposition of retained austenite (RA) in tool steels for plastic molding in correlation with the alloy chemical composition and the tempering parameters. Two grades differing in their silicon content with initial mixed bainitic/martensitic microstructures were investigated using in situ synchrotron high-energy X-ray diffraction (HEXRD) during tempering in the 550 °C to 600 °C temperature range for one-hour holding time. Results indicated carbide formation during heating or isothermal holding; however, retained austenite remained untransformed up to the end of the tempering holding time in all investigated conditions for both grades. In situ HEXRD provides direct evidence of the transformation of retained austenite into fresh martensite on cooling from the tempering stage. This behavior is correlated to the evolution of carbon enrichment of retained austenite and the effect of silicon is discussed.