고강도강의 미세조직 제어가 수소확산계수, 트랩 활성화에너지 및 Sour 환경 내 균열 저항성에 미치는 영향
Effect of Microstructure Control of High-Strength Steel on Hydrogen Diffusivity, Trap Activation Energy, and Cracking Resistance in Sour Environments
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The aim of this study was to investigate effects of microstructure control on hydrogen diffusivity, trap activationenergy, 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 associatedwith 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 polarizationbehavior on the surface at an early corrosion stage. To ensure high resistance to HIC of the steel, it is recommendedto 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 ofbainite, retained austenite (RA), and martensite-austenite (MA) constituents are not too high. Additionally, postheattreatment at below A1 temperature is desired to decompose locally distributed RA and MA constituents.
Abstract
The aim of this study was to investigate effects of microstructure control on hydrogen diffusivity, trap activationenergy, 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 associatedwith 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 polarizationbehavior on the surface at an early corrosion stage. To ensure high resistance to HIC of the steel, it is recommendedto 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 ofbainite, retained austenite (RA), and martensite-austenite (MA) constituents are not too high. Additionally, postheattreatment at below A1 temperature is desired to decompose locally distributed RA and MA constituents.
참고문헌 (12)
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