Corrosion Fatigue Crack Growth Behavior of Austenitic Stainless Steels in Seawater Environment
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摘要: 研究了304，316和321不锈钢在室温~80℃的空气和海水中的腐蚀疲劳裂纹扩展行为。结果表明：三种不锈钢在海水环境中的腐蚀疲劳裂纹扩展速率明显高于在空气中的，这是由于腐蚀环境中的氢致开裂和阳极溶解对裂纹扩展起加速作用。海水对材料疲劳行为的加速作用与测试参数有关：应力强度因子幅值越小、加载频率越低，腐蚀加速作用越明显。基于Paris公式对裂纹扩展速率进行分析，结果表明，材料在室温~80℃海水中的腐蚀疲劳裂纹扩展速率符合Paris公式。Abstract: The corrosion fatigue crack growth behavior of 304, 316 and 321 stainless steels in air and seawater at room temperature(RT) - 80 ℃ was studied. The results show that the corrosion fatigue crack growth rate of the three stainless steels in seawater environment was significantly higher than that in air, which was due to the accelerating effects of hydrogen-induced cracking and anodic dissolution in the corrosive environment. The acceleration effect of seawater on fatigue behavior of materials was related to the test parameters: the smaller the magnitude of the stress intensity factor and the lower the loading frequency, the more obvious the acceleration effect of corrosion. The crack growth rate was analyzed based on the Paris formula. The results show that the corrosion fatigue crack growth rate of the materials in seawater at room temperature to 80 ℃ agreed well with the Paris formula.
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