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<p>Quenching and partitioning can produce excellent combinations of strength and ductility. Comprehensive knowledge regarding the effect of isothermal holds below <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(M_s\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>M</mi> <mi>s</mi> </msub> </math></EquationSource> </InlineEquation> is relevant to plate processing but is currently lacking. Microstructure and mechanical properties of a 0.3C–1.5Si–1.5Mn–0.3Cr steel held from 10 seconds to 3 hours at 280 °C were investigated. The results show increased austenite stability at shorter hold times. Longer hold times resulted in bainitic constituents and coarser retained austenite, with reduced tensile ductility.</p>

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Influence of Isothermal Hold Times on Microstructure and Mechanical Properties During the Quench and Partitioning Process for a Medium Carbon Steel

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Miranda D. Bell,
  • Adira T. Y. Balzac,
  • Daniel M. Field,
  • Krista R. Limmer,
  • Michael C. Rupinen,
  • Kip. O. Findley,
  • John G. Speer

摘要

Quenching and partitioning can produce excellent combinations of strength and ductility. Comprehensive knowledge regarding the effect of isothermal holds below \(M_s\) M s is relevant to plate processing but is currently lacking. Microstructure and mechanical properties of a 0.3C–1.5Si–1.5Mn–0.3Cr steel held from 10 seconds to 3 hours at 280 °C were investigated. The results show increased austenite stability at shorter hold times. Longer hold times resulted in bainitic constituents and coarser retained austenite, with reduced tensile ductility.