Metals (Apr 2024)

Study on Corrosion Fatigue Behavior of 304L Austenite Stainless Steel in 325 °C High-Temperature Water Environment

  • Huanchun Wu,
  • Xiangbing Liu,
  • Chaoliang Xu,
  • Yuanfei Li,
  • Jian Yin,
  • Xiao Jin,
  • Wenqing Jia,
  • Wangjie Qian,
  • Peng Wang,
  • Yanwei Zhang

DOI
https://doi.org/10.3390/met14050489
Journal volume & issue
Vol. 14, no. 5
p. 489

Abstract

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The fatigue crack growth behavior of 304L austenitic stainless steel (SS) in a 325 °C high-temperature and high-pressure water environment were investigated by a corrosion fatigue test system, by electron back scatter diffraction (EBSD), and by a transmission electron microscope (TEM). The experimental results indicated that the crack growth rate (CGR) of 304L SS increases with increasing the stress intensity factor, stress level, and fatigue frequency (f). Compared to dissolved hydrogen (DH) in a high-temperature water environment, dissolved oxygen (DO) significantly enhances the CGR by about an order of magnitude higher. The crack tip of 304L SS after the corrosion fatigue test under higher stress levels is sharper, with more secondary cracks on the fracture surface, while the crack tip under lower stress levels is blunter with relatively fewer secondary cracks. The oxidation behavior at the crack tip was analyzed under different loading and water chemistry conditions, and a related effect on the crack tip and CGR was clarified.

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