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<p>This study investigates the kinetics of austenite transformation in DIN 1.5025 medium-carbon, high-silicon steel under controlled slow cooling conditions ranging from 0.1 to 5&#xa0;°C/s. Using dilatometry, laser scanning confocal microscopy, scanning electron microscopy (SEM) with energy-dispersive x-ray spectroscopy (EDS), and Vickers hardness testing, the phase transformation behavior and resultant microstructures were thoroughly analyzed. Results show that as the cooling rate increases from 0.1 to 5&#xa0;°C/s, the pearlite transformation start temperature decreases from 723 to 655&#xa0;°C and increases in hardness from 285 to 346&#xa0;HV. The volume fraction of ferrite decreases from 48 to 36%, while pearlite content increases correspondingly. Kinetic analysis using the Johnson–Mehl–Avrami model reveals that the Avrami exponent (n) varies from 1.02 to 1.12, indicating a transition from coarse to finer pearlite morphology with an increasing cooling rate. The activation energy for the transformation, calculated using the Kissinger method, is 566.94&#xa0;kJ/mol, aligning with previous studies. These findings enhance the understanding of phase transformation kinetics in DIN 1.5025 steel and provide critical insights for optimizing heat treatment processes to achieve tailored microstructures and mechanical properties for high-strength applications in the automotive and transportation industries.</p>

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Phase Transformation Kinetics of Austenite in DIN 1.5025 Steel under Controlled Slow Cooling Conditions

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Shima Pashangeh,
  • Seyyed Sadegh Ghasemi Banadkouki,
  • Mohammad Hadi Moradi Ardekani

摘要

This study investigates the kinetics of austenite transformation in DIN 1.5025 medium-carbon, high-silicon steel under controlled slow cooling conditions ranging from 0.1 to 5 °C/s. Using dilatometry, laser scanning confocal microscopy, scanning electron microscopy (SEM) with energy-dispersive x-ray spectroscopy (EDS), and Vickers hardness testing, the phase transformation behavior and resultant microstructures were thoroughly analyzed. Results show that as the cooling rate increases from 0.1 to 5 °C/s, the pearlite transformation start temperature decreases from 723 to 655 °C and increases in hardness from 285 to 346 HV. The volume fraction of ferrite decreases from 48 to 36%, while pearlite content increases correspondingly. Kinetic analysis using the Johnson–Mehl–Avrami model reveals that the Avrami exponent (n) varies from 1.02 to 1.12, indicating a transition from coarse to finer pearlite morphology with an increasing cooling rate. The activation energy for the transformation, calculated using the Kissinger method, is 566.94 kJ/mol, aligning with previous studies. These findings enhance the understanding of phase transformation kinetics in DIN 1.5025 steel and provide critical insights for optimizing heat treatment processes to achieve tailored microstructures and mechanical properties for high-strength applications in the automotive and transportation industries.