인장응력과 H2S 부식의 복합조건 하에서 고강도 강재의 수소확산 거동 분석을 위한 Numerical 확산모델과 이론적 고찰
Theoretical Considerations of Numerical Model for Hydrogen Diffusion Behavior of High-Strength Steel Under Combined Action of Tensile Stress and H2S Corrosion
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The hydrogen diffusion and trapping model with a numerical finite difference method (FDM) was modifiedand extended to accommodate H2S corrosion and scale forming processes of high-strength steel under tensilestress condition. The newly proposed diffusion model makes it possible to clearly understand combinedeffect of tensile stress and H2S corrosion process on hydrogen diffusion behaviors. The core concept ofthis theoretical approach is that overall diffusion behavior is separated into diffusion process through tworespective layers: an outer sulfide scale and an inner steel matrix. Diffusion coefficient values determinedby curve-fitting permeation data reported previously with the newly proposed diffusion model indicate thatthe application of tensile stress can contribute to continual increase in the diffusivity in the sulfide scalewith a high density of defect. This suggests that the scale with a lower stability under the stress conditioncan be a key parameter to enhance hydrogen influx in the steel matrix. Consequently, resistance to hydrogenassisted cracking of the steel under tensile stress can be decreased significantly.
Abstract
The hydrogen diffusion and trapping model with a numerical finite difference method (FDM) was modifiedand extended to accommodate H2S corrosion and scale forming processes of high-strength steel under tensilestress condition. The newly proposed diffusion model makes it possible to clearly understand combinedeffect of tensile stress and H2S corrosion process on hydrogen diffusion behaviors. The core concept ofthis theoretical approach is that overall diffusion behavior is separated into diffusion process through tworespective layers: an outer sulfide scale and an inner steel matrix. Diffusion coefficient values determinedby curve-fitting permeation data reported previously with the newly proposed diffusion model indicate thatthe application of tensile stress can contribute to continual increase in the diffusivity in the sulfide scalewith a high density of defect. This suggests that the scale with a lower stability under the stress conditioncan be a key parameter to enhance hydrogen influx in the steel matrix. Consequently, resistance to hydrogenassisted cracking of the steel under tensile stress can be decreased significantly.
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