Constitutive modeling of nitrogen-alloyed austenitic stainless steel at low and high strain rates and temperatures

材料科学 奥氏体不锈钢 位错 流动应力 应变率 冶金 本构方程 奥氏体 微观结构 波特文-勒夏特列效应 硬化(计算) 变形(气象学) 可塑性 复合材料 动态应变时效 热力学 有限元法 腐蚀 物理 图层(电子)
作者
Farid Abed,Shivakumar I. Ranganathan,M. A. Serry
出处
期刊:Mechanics of Materials [Elsevier]
卷期号:77: 142-157 被引量:29
标识
DOI:10.1016/j.mechmat.2014.07.007
摘要

In this paper, microstructures-based constitutive relations are introduced to simulate the thermo-mechanical response of two nitrogen-alloyed austenitic stainless steels; Nitronic-50 and Uranus-B66, under static and dynamic loadings. The simulation of the flow stress is developed based on a combined approach of two different principal mechanisms; the cutting of dislocation forests and the overcoming of Peierls–Nabarro barriers. The experimental observations for Nitronic-50 and Uranus-B66 conducted by Guo and Nemat-Nasser (2006) and Fréchard et al. (2008), respectively, over a wide range of temperatures and strain rates are also utilized in understanding the underlying deformation mechanisms. Results for the two stainless steels reveal that both the initial yielding and strain hardening are strongly dependent on the coupling effect of temperatures and strain rates. The methodology of obtaining the material parameters and their physical interpretation are presented thoroughly. The present model predicts results that compare very well with the experimental data for both stainless steels at initial temperature range of 77–1000 K and strain rates between 0.001 and 8000 s−1. The effect of the physical quantities at the microstructures on the overall flow stress is also investigated. The evolution of dislocation density along with the initial dislocation density contribution plays a crucial role in determining the thermal stresses. It was observed that the thermal yield stress component is more affected by the presence of initial dislocations and decreases with the increase of the originated (initial) dislocation density.
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