Abstract Fatigue crack growth (FCG) behaviour of austenitic stainless steel SS316L(N) has been evaluated at different temperatures in the threshold and Paris regimes. Comparison of crack closure corrected data from ASTM tests and the data from constant Kmax test at 300 K brings out the inherent inadequacies of crack closure correction in describing the FCG behaviour. An attempt to describe the temperature effects considering the temperature dependence of elastic modulus and yield strength was not satisfactory. Further analysis to understand the possible role of dynamic strain ageing (DSA) indicated different activation energies in the temperature ranges 623–723 K and 723–823 K, ~80 and 150 kJ mole−1 respectively, pointing to carbon and nitrogen diffusion as the responsible DSA mechanisms.

中文翻译：

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温度对SS316L(N)疲劳裂纹扩展行为的影响

摘要 对奥氏体不锈钢 SS316L(N) 在阈值和巴黎状态下不同温度下的疲劳裂纹扩展 (FCG) 行为进行了评估。将 ASTM 测试的裂纹闭合校正数据与 300 K 下恒定 Kmax 测试的数据进行比较，揭示了裂纹闭合校正在描述 FCG 行为方面的固有不足。考虑弹性模量和屈服强度的温度依赖性来描述温度效应的尝试并不令人满意。进一步分析动态应变时效 (DSA) 的可能作用表明，在 623-723 K 和 723-823 K、~80 和 150 kJ 摩尔-1 的温度范围内有不同的活化能，指出碳和氮扩散作为负责任的 DSA 机制。