Mechanical, microstructural behaviour and modelling of dual phase steels under complex deformation paths
authors Liao, J; Sousa, JA; Lopes, AB; Xue, X; Barlat, F; Pereira, AB
nationality International
journal INTERNATIONAL JOURNAL OF PLASTICITY
author keywords Constitutive behaviour; Anisotropic material; Mechanical testing; Microstructures; Characteristics
keywords ANISOTROPIC HARDENING MODEL; LOW-CARBON STEEL; STRAIN-PATH; SHEET METALS; PLASTICITY MODEL; ALUMINUM-ALLOY; LOADING PATHS; IF STEEL; PART II; EVOLUTION
abstract This paper aims to identify the mechanisms associated to the transient hardening behaviour of dual phase steels under strain path changes, and to capture the observed material behaviours with appropriate constitutive models. First, three DP steel sheets with different amounts of martensite were tested under monotonic and various strain path changes. Second, microstructural analysis of the materials before and after strain path change were performed by means of SEM, TEM, and EBSD. The contribution of texture evolution on the mechanical behaviour was also assessed using the visco-plastic self consistent (VPSC) polycrystal plasticity model. Transient hardening behaviour and permanent softening were observed in the tension tension tests for all the studied DP steels. These behaviours were explained by the development of strain gradients during the first load resulting from strain accommodation incompatibilities between the ferrite and martensite phases. For the purpose of describing the macroscopic material behaviours, the enhanced homogeneous anisotropic hardening (HAH) model (Barlat et al., 2014) integrated with the Yld2000-2d anisotropic yield function were adopted for constitutive modelling. The simulation results were discussed in view of the microstructure evolution. (C) 2016 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0749-6419
isbn 1879-2154
year published 2017
volume 93
beginning page 269
ending page 290
digital object identifier (doi) 10.1016/j.ijplas.2016.03.010
web of science category Engineering, Mechanical; Materials Science, Multidisciplinary; Mechanics
subject category Engineering; Materials Science; Mechanics
unique article identifier WOS:000402213200014
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journal impact factor 5.502
5 year journal impact factor 6.111
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