Effect of Oxide Film Crack Length on Film-induced Stress in Stress Corrosion Cracking Tip

2018 2nd International Conference on Advanced Technologies in Manufacturing and Materials Engineering

Hongliang, Yang^1 ; He, Xue^2 ; Yinghao, Cui^2 ; Chenqiang, Ni^2

Center of Engineering Training, Xi'An University of Science and Technology, Xi'an

710054, China^1

School of Mechanical Engineering, Xi'An University of Science and Technology, Xi'an

710054, China^2

关键词: Environment-assisted cracking;    High-temperature water;    Induced stress;    Micro-mechanical;    Ni based alloy;    Nickel based alloy;    Nuclear environments;    Stress strain state;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/389/1/012014/pdf
DOI  :  10.1088/1757-899X/389/1/012014

来源: IOP

【 摘 要 】

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.