Effects of pressurized water reactor environment and cyclic loading parameters on the low cycle fatigue behavior of 304L stainless steel

Vainionpää, Aleks; Seppänen, Tommi; Que, Zaiqing

doi:10.1016/j.ijfatigue.2024.108231

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Overall Morphology Of the Crack Tip1

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2024

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“…Figure 10f shows the cross-sectional morphology of the middle part of the crack with abundant PSBs and plastic deformation on both sides of the crack. In one word, PSBs is an important mode of fatigue crack initiation [31].…”

Section: Overall Morphology Of the Crack Tipmentioning

confidence: 99%

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

Wu,

Liu,

et al. 2024

Metals

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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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Section: Overall Morphology Of the Crack Tipmentioning

confidence: 99%