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<p>The continuous-cooling-transformation (CCT) and time–temperature-transformation (TTT) diagrams are useful for the design and optimization of thermomechanical processing routes for forgings. In this study, the influence of plastic deformation applied at 900&#xa0;°C prior to continuous cooling (DCCT) and prior to the isothermal holding temperature (DTTT) on the kinetics of phase transformation in novel 0.17C–3–4Mn–1Si–0.5Al–0.2Mo–Ti–V-type steels was investigated. The analysis was performed both computationally using JMatPro software and experimentally using dilatometer. The obtained results showed that the steel containing 4 mass/% Mn is suitable for advanced high-strength forgings with a microstructure consisting of martensite and retained austenite (RA) due to its high hardenability in both non-deformed and deformed states. This provides a broad processing window for the isothermal holding step between the M<sub>s</sub> and M<sub>f</sub> temperatures. The steel containing 3 mass/% of Mn is better suited for forgings with a microstructure consisting of bainite and RA due to a wide temperature range for bainitic transformation, short incubation time and rapid completion of transformation during isothermal treatment.</p>

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Effect of Mn concentration and hot deformation on phase transformation kinetics in medium-manganese steels with Ti and V microadditions

  • 期刊论文

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  • 发表日期：

    2025年6月12日

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  • Aleksandra Kozłowska,
  • Anna Wojtacha,
  • Adam Skowronek

摘要

The continuous-cooling-transformation (CCT) and time–temperature-transformation (TTT) diagrams are useful for the design and optimization of thermomechanical processing routes for forgings. In this study, the influence of plastic deformation applied at 900 °C prior to continuous cooling (DCCT) and prior to the isothermal holding temperature (DTTT) on the kinetics of phase transformation in novel 0.17C–3–4Mn–1Si–0.5Al–0.2Mo–Ti–V-type steels was investigated. The analysis was performed both computationally using JMatPro software and experimentally using dilatometer. The obtained results showed that the steel containing 4 mass/% Mn is suitable for advanced high-strength forgings with a microstructure consisting of martensite and retained austenite (RA) due to its high hardenability in both non-deformed and deformed states. This provides a broad processing window for the isothermal holding step between the Ms and Mf temperatures. The steel containing 3 mass/% of Mn is better suited for forgings with a microstructure consisting of bainite and RA due to a wide temperature range for bainitic transformation, short incubation time and rapid completion of transformation during isothermal treatment.