Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Behaviors of Ultra-high-strength Alloy Steel According to Heat Treatment Conditions

초고강도 합금강의 열처리 조건에 따른 부식거동

  • Eun Hye Hwang (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Min Jung Park (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Jin Sung Park (POSCO Technical Research Laboratories) ;
  • Sung Jin Kim (Department of Advanced Materials Engineering, Sunchon National University)
  • 황은혜 (순천대학교 신소재공학과) ;
  • 박민정 (순천대학교 신소재공학과) ;
  • 박진성 (POSCO 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2024.09.27
  • Accepted : 2024.10.06
  • Published : 2024.10.31
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Abstract

This study aimed to examine effects of microstructural changes through quenching and tempering (QT) and quenching and partitioning (Q&P) heat treatments on corrosion behavior of ultra-high-strength alloy steel containing Cr, Mo, Ni, and Cu. Electrochemical methods including polarization and impedance spectroscopy along with microstructural characterization indicated that the conventional partitioning process could lead to formation of retained austenite with larger size in a martensitic matrix, resulting in a higher corrosion rate in saline environments. In contrast, a slightly higher partitioning temperature than marten-site transformation start temperature produced more finely distributed austenite in a bainitic matrix, exhibiting greater long-term corrosion resistance. This improvement was primarily attributed to the uniform distribution of Ni in the microstructure and the formation of Cr-enriched corrosion product with inhibiting properties in advanced stages of corrosion. These findings provide significant insights into alloying strategies to ensure superior long-term corrosion resistance of ultra-high-strength alloy steel in neutral aqueous environments.

Keywords

Acknowledgement

This research was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C4001255).

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