Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Microstructure Control of High-Strength Steel on Hydrogen Diffusivity, Trap Activation Energy, and Cracking Resistance in Sour Environments

고강도강의 미세조직 제어가 수소확산계수, 트랩 활성화에너지 및 Sour 환경 내 균열 저항성에 미치는 영향

  • Jin Sung Park (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Sung Jin Kim (Department of Advanced Materials Engineering, Sunchon National University)
  • 박진성 (순천대학교 신소재공학과) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2023.04.07
  • Accepted : 2023.04.12
  • Published : 2023.04.30
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Abstract

The aim of this study was to investigate effects of microstructure control on hydrogen diffusivity, trap activation energy, and cracking behaviors of high-strength steel using a range of experimental techniques. Results of this study showed that susceptibility to hydrogen induced cracking (HIC) was significantly associated with hydrogen diffusivity and trap activation energy, which were primarily influenced by the microstructure. On the other hand, microstructural modifications had no significant impact on electrochemical polarization behavior on the surface at an early corrosion stage. To ensure high resistance to HIC of the steel, it is recommended to increase the cooling rate during normalizing to avoid formation of banded pearlite in the microstructure. However, it is also essential to establish optimal heat treatment conditions to ensure that proportions of bainite, retained austenite (RA), and martensite-austenite (MA) constituents are not too high. Additionally, post-heat treatment at below A1 temperature is desired to decompose locally distributed RA and MA constituents.

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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