Constitutive modeling of hot horming of austenitic stainless steel 316LN by accounting for recrystallization in the dislocation evolution

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Kooiker, H.^1,2 ; Perdahciolu, E.S.^2 ; Van Den Boogaard, A.H.^2

Philips Consumer Lifestyle, Drachten, Netherlands^1

University of Twente, Department of Applied Mechanics, Enschede, Netherlands^2

关键词: Cell patterns;    Dislocation evolution;    Dynamic recovery and recrystallization;    Mean free path;    Mechanical model;    Mechanical response;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032026/pdf
DOI  :  10.1088/1742-6596/734/3/032026

来源: IOP

【 摘 要 】

Hot compression test data taken from Zhang [1] of metastable austenitic stainless steel AISI 316LN over a range of strain rates and temperatures shows typical dynamic recovery and recrystallization behavior. It is proposed to model this behavior by incorporating not only the hardening and recovery into the Bergstrom dislocation evolution equation, but also the recrystallization. It is shown that the initial mechanical response before recrystallization can be accurately represented by assuming that the mean free path evolves as the microstructure evolves from homogeneously spaced dislocations to cell-pattern. Results show that this novel continuum mechanical model can predict the observed behavior, showing a good match to the experimental data and capturing the transition from recrystallization to (almost) no recrystallization.