Cleavage-dissolution assisted stress corrosion cracking under elastic loads
نویسندگان
چکیده
Abstract As a significant cause of disastrous accidents, stress corrosion cracking (SCC) under elastic loads was investigated in type 316 L single-crystal stainless steel immersed boiling 45 wt% MgCl 2 solution. Three-dimensional microcrack morphologies, characterized using synchrotron-based X-ray computed tomography, indicate that the SCC advanced along cleavage planes (1 0 0) with lowest free surface energy. The first-principles simulations show synergistic adsorption H and Cl atoms octahedral interstices minimized energy (0 1) owing to 73% reduction. Afterwards, cleavage-dissolution mechanism is put forward, proposing essentially originates from preferential brittle rupture corrosive environment particle adsorbed low-surface-energy concentration zones, anodic dissolution crack fronts. Besides, particles primarily consist hydrogen electronegative ions such as chlorine ions.
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ژورنال
عنوان ژورنال: npj Materials degradation
سال: 2021
ISSN: ['2397-2106']
DOI: https://doi.org/10.1038/s41529-021-00172-7