应力强度因子对高温水环境中镍基合金裂尖电化学腐蚀电位的影响（英文）

Effects of Stress Intensity Factor on Electrochemical Corrosion Potential at Crack Tip of Nickel-Based Alloys in High Temperature Water Environments

在高温水环境中,应力会提高镍基合金裂纹尖端的阳极溶解速率并加速裂纹扩展。采用弹塑性有限元方法,对高温水环境中镍基合金裂纹尖端应力和电化学腐蚀的关系进行研究。分析了应力强度因子对模拟高温水环境中600合金1T-CT试样裂纹尖端表面电化学腐蚀电位的影响,并讨论了弹性变形和塑性变形对裂纹尖端电化学腐蚀电位变化的影响。

Stress will enhance the local anodic dissolution rate of nickel-based alloys at crack tip and accelerate the crack propagation in high temperature water environments. The relationship between stress and corrosion was studied by the elastic plastic finite element method. The effects of stress intensity factor on the surface electrochemical corrosion potential （ECP） at the crack tip of alloys 600 with a 1T-CT specimen in simulated boiling water reactor environment were analyzed. The effects of plastic deformation and elastic deformation on the changes of the electro-chemical corrosion potential around the crack tip were also discussed. The results indicate that the effects of stress intensity factors on ECP changes of the crack tip surface have the maximum values in the front of the crock propagation, The values of ECP changes increase with the increase of stress obvious than that of elastic deformation. and they decrease gradually towards the sides of the crack. intensity factor. The effect of plastic deformation is more