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<p>Hot deformation behavior of misch metal-treated low-carbon aluminum-killed (LCAK) steel was investigated with various strain rates (0.01, 0.1, 1.0, and 10/sec) and temperatures (950, 1050, 1150, and 1250&#xa0;°C) with 70% deformation using a thermomechanical simulator. A constitutive equation for flow stress during hot deformation of LCAK steel containing 260&#xa0;ppm misch metal (65% Ce and 35% La) was developed. The empirical parameters in the constitutive equation were estimated against various strains to develop a strain-compensated equation of flow stress as a function of strain rate and temperature. An excellent match was obtained between the experimental and predicted flow stress values. The activation energy for hot deformation of misch metal-treated LCAK steel was estimated as 344&#xa0;kJ/mol. The evolution of microstructural features and rare earth-based dual-phase complex inclusions was analyzed for defect formation. A safe deformation zone was identified using processing maps, defined by the contours of strain rate sensitivity (<i>m</i>) and efficiency of power dissipation (<i>η</i>), and dynamic recrystallized (DRX) grain size in the two-dimensional domain of strain rates and temperatures. </p>

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Hot Deformation Behavior of Misch Metal-Treated Low-Carbon Aluminum-Killed Steel in Presence of Inclusions

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Nachiketa Yadav,
  • Gour Gopal Roy

摘要

Hot deformation behavior of misch metal-treated low-carbon aluminum-killed (LCAK) steel was investigated with various strain rates (0.01, 0.1, 1.0, and 10/sec) and temperatures (950, 1050, 1150, and 1250 °C) with 70% deformation using a thermomechanical simulator. A constitutive equation for flow stress during hot deformation of LCAK steel containing 260 ppm misch metal (65% Ce and 35% La) was developed. The empirical parameters in the constitutive equation were estimated against various strains to develop a strain-compensated equation of flow stress as a function of strain rate and temperature. An excellent match was obtained between the experimental and predicted flow stress values. The activation energy for hot deformation of misch metal-treated LCAK steel was estimated as 344 kJ/mol. The evolution of microstructural features and rare earth-based dual-phase complex inclusions was analyzed for defect formation. A safe deformation zone was identified using processing maps, defined by the contours of strain rate sensitivity (m) and efficiency of power dissipation (η), and dynamic recrystallized (DRX) grain size in the two-dimensional domain of strain rates and temperatures.