The nitrogen-containing austenitic stainless steel 316LN has been chosen as the material for nuclear main-pipe, which is one of the key parts in 3rd generation nuclear power plants. In this research, a constitutive model of nitrogen-containing austenitic stainless steel is developed. The true stress-true strain curves obtained from isothermal hot compression tests over a wide range of temperatures (900–1250°C) and strain rates (10−3–10 s−1), were employed to study the dynamic deformational behavior of and recrystallization in 316LN steels. The constitutive model is developed through multiple linear regressions performed on the experimental data and based on an Arrhenius-type equation and Zener-Hollomon theory. The influence of strain was incorporated in the developed constitutive equation by considering the effect of strain on the various material constants. The reliability and accuracy of the model is verified through the comparison of predicted flow stress curves and experimental curves. Possible reasons for deviation are also discussed based on the characteristics of modeling process.
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机译：含氮奥氏体不锈钢316LN已被选作核主管的材料，这是第三代核电厂的关键部件之一。在这项研究中，建立了含氮奥氏体不锈钢的本构模型。从等温热压缩试验获得的真应力-真应变曲线在宽温度范围（900–1250°C）和应变速率（10 −3 –10 s −1 ），用于研究316LN钢的动态变形行为和再结晶。通过对实验数据进行多次线性回归并基于Arrhenius型方程和Zener-Hollomon理论建立本构模型。通过考虑应变对各种材料常数的影响，将应变的影响纳入已开发的本构方程中。通过比较预测的流动应力曲线和实验曲线，验证了模型的可靠性和准确性。根据建模过程的特点，还讨论了可能的偏差原因。
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