Oxide film rupture theory has become one of the most popular models to quantitatively predict the stress corrosion cracking rate at crack tip of Ni-based alloys in high temperature water nuclear environment. To understand the micro-mechanical state at the tip of environment assisted cracking (EAC) without considering the external load, the stress-strain induced by oxide film in the base metal at the EAC tip was simulated and discussed using a commercial finite element analysis code. Results show the stress-strain state induced by oxide film is different because of crack length, and film-induced stress is one of the main factors that can't be ignored in the stress corrosion crack growth driving force. The study also provides a foundation to improve the quantitative predication accuracy of EAC growth rate of nickel-based alloys and austenitic stainless steels in the important structures of nuclear power plants.
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