Microstructure evolution in 439 stainless steels under tensile: phase field simulation and experiment

作者：Yongbo Liu, Mingtao Wang, Qingcheng Liu, Jianfeng Jin, Qing Peng, Yaping Zong · 发表于：Modelling and Simulation in Materials Science and Engineering · 年份：2024 · DOI：10.1088/1361-651x/ad2187 · 被引用次数：6 · 研究领域：Microstructure and Mechanical Properties of Steels、Solidification and crystal growth phenomena、Aluminum Alloy Microstructure Properties

Abstract A combination of phase-field simulations and experimental validation is utilized to examine the effect of annealing tension on the microstructure evolution of 439 ferrite stainless steel (FSS). The study reveals the competing mechanisms of texture under tensile stress. Furthermore, a phase field model that incorporates anisotropic grain boundary (GB) energy and elastic energy is established. The microstructure of 439 FSS is created using a 3D reconstruction strategy based on the 2D electron backscatter diffraction characterization proposed in this work. Elastic constants are calibrated using actual alloy data and determined through molecular dynamics simulations. Finally, simulations of the grain coarsening process in 439 FSS are successfully achieved, considering both tensile stress and anisotropic GB energy effects. The results reveal that the presence of low-angle GBs deviates from Hillert model predictions in terms of grain size distribution and slows down the average grain size evolution over time. A significant deviation in the grain size distribution, compared to Hillert predictions, is observed in the textured system under tensile stress. The results of growth kinetics indicate that tensile stress promotes grain growth more than GB energy anisotropy retards microstructure evolution. Both experiment and simulation results consistently demonstrate that grains with <111>//ND orientation experience a better growth proficiency compared to grains of other ori...