Title: Work-hardening/softening behaviour of B.C.C. polycrystals during changing strain paths: I. An integrated model based on substructure and texture evolution, and its prediction of the stress-strain behaviour of an if steel during two-stage strain paths
Authors: Peeters, Bart ×
Seefeldt, Marc
Teodosiu, C.
Kalidindi, Surya R.
Van Houtte, Paul
Aernoudt, Etienne #
Issue Date: 2001
Publisher: Pergamon-elsevier science ltd
Series Title: Acta Materialia vol:49 issue:9 pages:1607-1619
Abstract: For many years polycrystalline deformation models have been used as a physical approach to predict the anisotropic mechanical behaviour of materials during deformation, e.g. the r-values and yield loci. The crystallographic texture was then considered to be the main contributor to the overall anisotropy. However, recent studies have shown that the intragranular microstructural features influence strongly the anisotropic behaviour of b.c.c. polycrystals, as revealed by strain-path change tests (e.g. cross effect, Bausch-inger effect). This paper addresses a method of incorporating dislocation ensembles in the crystal plasticity constitutive framework, while accounting for their evolution during changing strain paths. Kinetic equations are formulated for the evolution of spatially inhomogeneous distributions of dislocations represented by three dislocation densities. This microstructural model is incorporated into a full-constraints Taylor model. The resulting model achieves for each crystallite a coupled calculation of slip activity and dislocation structure evolution, as a function of the crystallite orientation. Texture evolution and macroscopic flow stress are obtained as well. It is shown that this intragranular-microstructure based Taylor model is capable of predicting quantitatively the complex features displayed by stress-strain curves during various two-stage strain paths. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
ISSN: 1359-6454
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Mechanical Metallurgy Section (-)
Biochemistry Section (Medicine) (-)
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

Files in This Item:
File Status SizeFormat
pub00033.pdf Published 433KbAdobe PDFView/Open Request a copy

These files are only available to some KU Leuven Association staff members


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science