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Titolo:
Coupled quantitative simulation of microstructural evolution and plastic flow during dynamic recrystallization
Autore:
Ding, R; Guo, ZX;
Indirizzi:
Univ London Queen Mary & Westfield Coll, Dept Mat, London E1 4NS, England Univ London Queen Mary & Westfield Coll London England E1 4NS S, England
Titolo Testata:
ACTA MATERIALIA
fascicolo: 16, volume: 49, anno: 2001,
pagine: 3163 - 3175
SICI:
1359-6454(20010920)49:16<3163:CQSOME>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CELLULAR-AUTOMATON MODEL; STORED-ENERGY-DISTRIBUTION; GRAIN-SIZE; PHASE-TRANSITIONS; NUCLEATION MODELS; MONTE-CARLO; HOT WORKING; GROWTH; DEFORMATION; KINETICS;
Keywords:
theory & modeling; microstructure; dislocations; recrystallization & recovery; cellular-automaton;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Guo, ZX Univ London Queen Mary & Westfield Coll, Dept Mat, Mile End Rd, London E1 4NS, England Univ London Queen Mary & Westfield Coll Mile End Rd London England E1 4NS
Citazione:
R. Ding e Z.X. Guo, "Coupled quantitative simulation of microstructural evolution and plastic flow during dynamic recrystallization", ACT MATER, 49(16), 2001, pp. 3163-3175

Abstract

A new modelling approach that couples fundamental metallurgical principlesof dynamical recrystallization (DRX) with the cellular automaton (CA) method has been developed to simulate the microstructural evolution and the plastic flow behaviour during thermomechanical processing with DRX. It provides an essential link for multiscale modelling to bridge mesostructural dislocation activities with microstructural grain boundary dynamics, allowing accurate predictions of microstructure, plastic flow behaviour, and property attributes. Variations of dislocation density and growth kinetics of each dynamically recrystallizing grain (R-grain) were determined by metallurgicalrelationships of DRX, and the flow stress was evaluated from the average dislocation density of the matrix and all the R-grains. The growth directionand the shape of each R-grain were simulated using the CA method. The predictions of microstructural evolution and the flow behaviour at various hot working conditions agree well with the experimental results for an oxygen free high conductivity (OFHC) copper. It is identified that the oscillation of the flow stress-strain curve not only depends on thermomechanical processing parameters (strain rate and temperature) but also the initial microstructure. The mean size of R-grains is only a function of the Zener-Hollomon parameter. However, the percentage of DRX is not only related with the Zener-Hollomon parameter, but also influenced by the nucleation rate and the initial microstructure. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 02:06:17