The flow behavior of 316H austenitic stainless steel is investigated using hot compression tests. The modified Johnson-Cook and Zerilli-Armstrong models are developed, and modified Arrhenius-type model is established using an approach by dividing low and high stress region for determining key material constant and an uncomplicated approach for compensating strain in which the activation energy is determined from peak stress and only other material constants are considered as strain-dependent constants. The performance of all developed constitutive models is comparatively analyzed. It is indicated that the significant sensitivity of flow stress to temperature and strain rate is exhibited, and at 900 and 950 C, strain rate sensitivity is closely related to temperature and strain rate, which can be explained by low stacking fault energy for 316H austenitic stainless steel. The modified Arrhenius type model has a noticeably higher accuracy in predicting flow behaviour than other two developed models in spite of a good performance of all developed models according to visual examination and statistical analyses.

使用热压缩试验研究了316H奥氏体不锈钢的流动行为。开发了改进的Johnson-Cook模型和Zerilli-Armstrong模型，并通过划分低应力区域和高应力区域来确定关键材料常数的方法和用于补偿应变的简单方法（其中确定了活化能）来建立了改进的Arrhenius型模型。由峰值应力产生的应力和仅其他材料常数被视为应变相关常数。对所有已开发的本构模型的性能进行了比较分析。结果表明，流动应力对温度和应变速率具有显着的敏感性，在900和950 C时，应变速率敏感性与温度和应变速率密切相关，这可以用316H奥氏体不锈钢的低堆垛层错能来解释。尽管根据视觉检查和统计分析，所有开发的模型均具有良好的性能，但改进的Arrhenius型模型在预测流动行为方面的准确性明显高于其他两个开发的模型。