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Experimental and crystal plasticity evaluation of grain size effect on formability of austenitic stainless steel sheets

Amelirad, O ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmapro.2019.09.035
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Effects of the grain size on the forming limits of stainless steel 316 L sheets are investigated using crystal plasticity finite element method (CPFEM) by modeling of all grains. For preparing simulation models with different grain morphology, a grain generator code is developed. Using data from metallographic images, texture, and material properties, the developed code can be used for preprocessing of CPFEM. In order to extract mechanical and metallurgical data required for CPFEM, some experiments are carried out on different samples. Moreover, for the purpose of implementing the crystal plasticity formulations, an Abaqus user material subroutine (UMAT) is developed. Concerning the computational costs, a series of simulations are conducted for determining the minimum size of the sheet in a way that the stress-strain curves reflect those curves in the macro scale. In the simulations, forming limit curves are determined by employing the in-plane bi-axial loading. Different orientations in the slip systems between neighboring grains work as the primary cause for deformation localization and occurrence of necking. Therefore, there is no need to impose other imperfections such as groove in M-K model. The predicted FLDs are in agreement with those obtained in the experiments. According to these results, the forming limits decrease with reduction of average grain size. © 2019 The Society of Manufacturing Engineers
  6. Keywords:
  7. Finite element method ; Forming limit diagram ; Grain size and shape ; Plasticity ; Stress-strain curves ; Textures ; Crystal plasticity ; Crystal plasticity finite element methods (CP FEM) ; Deformation localization ; Forming limit curve ; Forming limit diagrams ; Grain size ; Metallographic images ; User material subroutine ; Austenitic stainless steel
  8. Source: Journal of Manufacturing Processes ; Volume 47 , 2019 , Pages 310-323 ; 15266125 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1526612518312015