The present study aimed at the propagation of the pit in CUSTOM 450 Stainless Steel blades after the initiation stage. The depth of pits was measured by Eddy Current and the relationship between pitting corrosion time and pit depth was determined based on simulation and compared to the experimental results. Moreover, the electrolyte potential and the local strain distribution around the pit were displayed at different potentials and times. The pit growth increased rapidly for a certain period and then declined. For stressed and stress-free samples, the local strain distribution and pit depth growth were compared at 350 mV_SCE potential. Based on the results, the presence of stress in the specimens accelerated the pitting corrosion growth in CUSTOM 450 stainless steel. To calculate the stresses on the blade surface, the model of the blade was constructed and two adjacent pits were created at the location of the fractured surface. The results show that the pits are turned into stress cracks after about 4 months corresponding to the result of the other references. To make a connection between accelerated pitting corrosion tests and the operating conditions of the gas turbine, the comparison of pitting time (simulation) was made for the stressed sample at.

350 mV_SCE potential and sample with real operating conditions.

本研究旨在在初始阶段后 CUSTOM 450 不锈钢叶片中的凹坑扩展。采用涡流法测量点蚀深度，通过模拟确定点蚀时间与点蚀深度的关系，并与实验结果进行比较。此外，电解液电位和凹坑周围的局部应变分布在不同的电位和时间显示。坑增长在一定时期内迅速增加，然后下降。对于受压和无应力样品，在 350 mV _{SCE 下}比较了局部应变分布和凹坑深度增长潜在的。根据结果​​，试样中应力的存在加速了 CUSTOM 450 不锈钢的点蚀增长。为了计算叶片表面的应力，构建了叶片模型，并在断裂表面的位置创建了两个相邻的凹坑。结果表明，凹坑在大约 4 个月后转变为应力裂纹，与其他参考文献的结果相对应。为了将加速点蚀试验与燃气轮机的运行条件联系起来，对受力样品进行了点蚀时间（模拟）的比较。

350 mV _SCE电位和实际操作条件下的样品。