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Titolo:
Work-hardening/softening behaviour of BCC polycrystals during changing strain paths: II. TEM observations of dislocation sheets in an if steel duringtwo-stage strain paths and their representation in terms of dislocation densities
Autore:
Peeters, B; Bacroix, B; Teodosiu, C; Van Houtte, P; Aernoudt, E;
Indirizzi:
Katholieke Univ Leuven, Dept Met & Mat Engn, B-3001 Louvain, Belgium Katholieke Univ Leuven Louvain Belgium B-3001 n, B-3001 Louvain, Belgium Univ Paris 13, CNRS, LPMTM, F-93430 Villetaneuse, France Univ Paris 13 Villetaneuse France F-93430 , F-93430 Villetaneuse, France
Titolo Testata:
ACTA MATERIALIA
fascicolo: 9, volume: 49, anno: 2001,
pagine: 1621 - 1632
SICI:
1359-6454(20010525)49:9<1621:WBOBPD>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MILD-STEEL; PLASTIC-FLOW; FCC CRYSTALS; METALS; MODEL; DISCRETIZATION; DEFORMATION; SIMULATION; DYNAMICS; SHEAR;
Keywords:
transmission electron microscopy (TEM); dislocations; microstructure; modelling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Peeters, B Katholieke Univ Leuven, Dept Met & Mat Engn, B-3001 Louvain, Belgium Katholieke Univ Leuven Louvain Belgium B-3001 ouvain, Belgium
Citazione:
B. Peeters et al., "Work-hardening/softening behaviour of BCC polycrystals during changing strain paths: II. TEM observations of dislocation sheets in an if steel duringtwo-stage strain paths and their representation in terms of dislocation densities", ACT MATER, 49(9), 2001, pp. 1621-1632

Abstract

The relationship between the developed intragranular microstructure and the deformation history of a grain in a low-carbon IF steel is comprehensively investigated during monotonic deformation and two-stage strain paths. TEMmicrographs show that dislocation sheets are currently generated parallel to the active slip planes. In the extended Taylor model developed in Part 1of this paper, such substructural features are modelled and updated dynamically for each strain increment. The actual structure bears some memory of the deformation history. This paper shows the capability of the extended Taylor model to reproduce several features of the substructural developments observed in transmission electron micrographs after monotonic deformation and two-stage strain paths. The evolution of the mesostructural features in stable and unstable crystals are discussed in the context of the work-hardening/softening behaviour of the TF steel. It is demonstrated that the modelcan be used to predict qualitatively the intensity and the polarity of thedislocation sheets in a grain during any deformation path. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 27/09/20 alle ore 07:14:37