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Investigation of pitting-induced stress corrosion cracking using a phase-field model coupled with crystal plasticity
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DOI：10.1016/j.engfracmech.2026.112102.png)
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Abstract
En 中文
Pitting corrosion is a critical failure mode in metallic materials due to its highly localized development and inherently unpredictable initiation. Under service loading, pits readily transition into stress corrosion cracking (SCC), often resulting in material failure. However, the role of microstructural features in governing SCC crack propagation paths remains inadequately understood, and robust mesoscale models capable of capturing SCC failure mechanisms at the crystal scale are still lacking. To address these gaps, we develop a crystal plasticity-coupled phasefield model for corrosion and employ it to systematically investigate the synergistic effects of mechanical loading and microstructural heterogeneities on pit-to-crack transition and SCC evolution. The model enables quantitative assessment of how crystal orientation, inclusions, and void size influence crack trajectories and failure mechanisms. The results show that mechanical loading markedly accelerates corrosion kinetics and promotes the transition from pitting to SCC. SCC crack propagation exhibits strong sensitivity to crystallographic orientation, leading to orientation-dependent crack paths. Microstructural defects (inclusions and voids) significantly modulate crack evolution: geometrically asymmetric inclusions alter the local stress field and induce asymmetric SCC morphologies, while increasing void size suppresses SCC propagation by diminishing the mechanical driving forces for corrosion. This study reveals the critical role of microstructural features in governing SCC evolution and provides mechanistic insights to guide microstructure-informed, SCC-resistant design at the crystal scale.
Keywords:
Stress corrosion cracking
Crystal plasticity modelling
Phase field method
Mechanical-chemical coupling
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