|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Peridynamic Modeling of Autonomous Lacy Cover Formation and of SCC
||Siavash Jafarzadeh, Ziguang Chen, Florin Bobaru
|On-Site Speaker (Planned)
Pits covered with lacy structure in stainless steel are dangerous because they may not be easily spotted, and catastrophic cracks can grow from them. Partial passivation of the pit walls is considered to be the main reason for the formation of lacy covers. In this study, a previously introduced peridynamic corrosion model is improved with a concentration-based passivation criterion. Having material properties, kinetics of the corresponding anodic reaction, and the applied potential as inputs, this model simulates pitting corrosion and the Diffusion-based Corrosion Layer (DCL). DCL can contribute to stress corrosion cracking (SCC). The computational results under potentiostatic conditions are in perfect agreement with the experiments. Evolution of electrolyte IR-drop is then taken into account. The effect of solution concentration and potential on pit ratio, corrosion rate, and the lacy cover structure were investigated. The model is also used to investigate the effect stresses have on corrosion rates and SCC.
||Planned: Supplemental Proceedings volume