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<p>In the present work, different heat-treatment schedules were employed, consisting of austenitization at 825 and 950&#xa0;°C for 10 min, followed by oil quenching to 300, 350, and 400&#xa0;°C with soaking time of 2 min, and subsequently water quenching to room temperature. The effects of these process variables on the microstructure, mechanical properties, and electrochemical behavior were investigated. The final microstructure after heat treatment consisted of ferrite, retained austenite, and islands of martensite. A balanced strength–ductility synergy was achieved, with a yield strength of approximately 458 ± 8&#xa0;MPa and an elongation of ~ 42% for the HT-1 and HT-2 conditions. Electrochemical impedance spectroscopy analysis revealed that the HT-2 samples exhibited the highest charge transfer resistance (<i>R</i><sub>ct</sub>) of 5702 Ω. Tafel plots further confirmed that the HT-2 and HT-3 samples demonstrated the highest corrosion resistance.</p>

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Effect of Microstructure on Mechanical and Electrochemical Behavior of DP- 590 Steel

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • S. Sharma,
  • S. Chandra,
  • R. K. Rai

摘要

In the present work, different heat-treatment schedules were employed, consisting of austenitization at 825 and 950 °C for 10 min, followed by oil quenching to 300, 350, and 400 °C with soaking time of 2 min, and subsequently water quenching to room temperature. The effects of these process variables on the microstructure, mechanical properties, and electrochemical behavior were investigated. The final microstructure after heat treatment consisted of ferrite, retained austenite, and islands of martensite. A balanced strength–ductility synergy was achieved, with a yield strength of approximately 458 ± 8 MPa and an elongation of ~ 42% for the HT-1 and HT-2 conditions. Electrochemical impedance spectroscopy analysis revealed that the HT-2 samples exhibited the highest charge transfer resistance (Rct) of 5702 Ω. Tafel plots further confirmed that the HT-2 and HT-3 samples demonstrated the highest corrosion resistance.