Four different saturation stress based models were employed to investigate the uniaxial tensile deformation behaviour of boron added Alloy 617M. Voce relationship described the tensile flow behaviour of the alloy to a reasonable extent at high strain levels over the temperatures range of 300 K–1023 K. On the contrary, the employed macroscopic Estrin-Mecking model could not provide an adequate description to flow stress versus true plastic strain data at different temperatures. In addition to Estrin-Mecking and Voce relationships, two different saturation models (Model-I and Model-II) were empirically developed and used in the present investigation. The developed relationships provide a better description of Alloy 617M work hardening behaviour compared to the existing models. Relative applicability of the different relationships has been verified based on their predictive capability of the tensile properties such as true yield and ultimate tensile strength and true uniform plastic strain. It was found that the predicted tensile properties using Model-II are comparable with the experimental data than those prediction obtained from the other models. The predicted shear modulus compensated saturation stress exhibited a peak value at 923 K due to the occurrence of dynamic strain ageing as well as precipitation strengthening. In the temperatures ranging from 473 K to 973 K, the observed lower values in the temperature dependent rate constant associated with the Model-II suggested the reduced activity of dynamic recovery at intermediate temperatures compared to 300 K and 1023 K. The rapid decrease in saturation stress, true ultimate strength and uniform plastic strain is the clear indication of the dominance of dynamic recovery effects at 1023 K for the Alloy 617M.

基于四种不同的基于饱和应力的模型，研究了添加硼的617M合金的单轴拉伸变形行为。Voce关系描述了在300 K–1023 K的温度范围内，在高应变水平下合金的拉伸流动行为在合理的范围内。相反，所采用的宏观Estrin-Mecking模型无法充分描述流动应力与在不同温度下的真实塑性应变数据。除了Estrin-Mecking和Voce关系外，还根据经验开发了两个不同的饱和度模型（Model-I和Model-II），并在本研究中使用了它们。与现有模型相比，开发的关系可以更好地描述Alloy 617M的工作硬化行为。基于它们对拉伸性能的预测能力，如真实屈服和极限拉伸强度以及真实均匀的塑性应变，已经验证了不同关系的相对适用性。已经发现，使用模型-II预测的拉伸性能与实验数据相比，与从其他模型获得的预测性能相当。预测的剪切模量补偿的饱和应力由于发生动态应变时效以及析出强化而在923 K处出现峰值。在473 K至973 K的温度范围内，与Model-II相关的与温度相关的速率常数的较低值表明，与300 K和1023 K相比，在中间温度下动态恢复的活性降低。饱和度迅速降低压力，