Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (1): 79-88.DOI: 10.1007/s40195-016-0488-9

Special Issue: 2017年钢铁材料专辑

• Orginal Article • Previous Articles     Next Articles

3D Crystal Plasticity Finite Element Modeling of the Tensile Deformation of Polycrystalline Ferritic Stainless Steel

Chi Zhang1(),Li-Wen Zhang1,Wen-Fei Shen1,Ying-Nan Xia1,Yu-Tan Yan1   

  1. 1.School of Materials Science and Engineering Dalian University of Technology Dalian China
  • Received:2016-04-29 Online:2017-02-16 Published:2017-02-16

Abstract:

A mesoscale model of plastic deformation of ferritic stainless steels (FSSs) is formulated by combining a crystal plasticity finite element model with 3D cellular automaton algorithm. The actual grain orientations of FSS cold rolling and annealing sheet have been detected by electron backscatter diffraction and selected to be assigned to the polycrystal model. The simulation results have been validated by comparing the calculated true stress-strain response with the experimental one. For the lack of considering the interactions of dislocations with impurities, there are no upper and lower yield points in the simulation stress-strain curves. However, the calculated yield strength and the stress-strain response after yielding agree well with the real material. The local stress and strain fields show inhomogeneous at mesoscale. The plastic deformations of the grains with typical orientations have been characterized. The analysis reveals that the grains with α fiber texture show higher thickness reduction ratio as compared to others. The deformation behaviors of the grains in polycrystal are not only related to the orientations but also to the interactions from adjacent grains.

Key words: Ferritic steels, Crystallographic orientation, Polycrystal plasticity modeling, Cellular automaton