Year: 2021
Type: article
Abstract: Localized plastic deformation has been observed to render nuclear reactor components more susceptible to stress corrosion cracking (SCC). However, it is not fully clear how localized strain impacts corrosion (oxidation) behavior. Herein, the surface reactivity and corrosion behavior of 304 L stainless steel specimens, deformed to different strain levels, was analyzed using advanced multimodal and multiscale methods. For the first time, we observed that localized deformation regions, e.g., deformation bands and α’-martensite featured smaller Volta potentials than the parent austenite matrix. This resulted in the establishment of localized corrosion potential gradients and the emergence of accelerated microscale galvanic corrosion. Particularly, regions that featured higher dislocation concentrations were more reactive on account of the reduction in the activation energy of corrosion due to the stored energy. The superposition of surface reactivity and strain distributions reveals that, SCC cracking is expected to initiate in regions of strain localization wherein micro-galvanic corrosion is favored.
Source: Materials & Design
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,400
Awards: G1801205373, CAREER: Taking Sustainable Cements to the Next Level: New Routes to Control and Amplify the Chemical Reactivity of Cementing Phases, G2971405447, G3387330441, G6181426207, G6671297155, Collaborative Research: Using sunlight to reduce air pollution and ensure corrosion resistant of concrete infrastructure., G8352698883
OpenAlex ID: W3132476706