{"title":"Study on Corrosion Fatigue Behavior of 304L Austenite Stainless Steel in 325 °C High-Temperature Water Environment","authors":"Huanchun Wu, X. Liu, Chaoliang Xu, Yuanfei Li, Jian Yin, Xiao Jin, Wenqing Jia, Wangjie Qian, Peng Wang, Yanwei Zhang","doi":"10.3390/met14050489","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":510812,"journal":{"name":"Metals","volume":"30 37","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metals","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3390/met14050489","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
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.
通过腐蚀疲劳试验系统、电子背散射衍射（EBSD）和透射电子显微镜（TEM）研究了 304L 奥氏体不锈钢（SS）在 325 °C 高温高压水环境下的疲劳裂纹生长行为。实验结果表明，304L SS 的裂纹生长率（CGR）随应力强度因子、应力水平和疲劳频率（f）的增加而增加。与高温水环境中的溶解氢（DH）相比，溶解氧（DO）能显著提高 CGR，高出约一个数量级。在较高应力水平下进行腐蚀疲劳试验后，304L SS 的裂纹尖端更锋利，断裂面上的次生裂纹更多，而在较低应力水平下，裂纹尖端更钝，次生裂纹相对较少。分析了不同加载和水化学条件下裂纹尖端的氧化行为，明确了裂纹尖端和 CGR 的相关影响。
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