Stress corrosion cracking characteristics of CF8A austenitic stainless steels and interactions between multiple cracks in a simulated PWR environment
作者： Youwei Xu , Hongyang Jing , Lianyong Xu , Yongdian Han , Lei Zhao
DOI: 10.1016/J.CONBUILDMAT.2019.01.090
关键词:
摘要: Abstract The stress corrosion cracking behaviors of CF8A austenitic stainless steels in a simulated pressurized water reactor environment are systematically investigated by slow-strain-rate tensile tests. Numerous transgranular (TGSCC) cracks identified upon the fracture steel surfaces. specimens tested at lower strain rates showed higher fractions TGSCC, larger number cracks, and smaller crack opening displacement. These phenomena caused anodic dissolution interactions. is dominant rates, thus crack-tip morphologies changed diffusion metal atoms micro-pores. interactions increase rapidly with increasing decrease radius spacing ratio. In addition, inhomogeneity growth interaction results small being shielded preferred cracks. On contrary, main accelerated stagnation eventually becoming critical that lead to specimen fracture.
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