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Multiscale modelling of stress and strain partitioning in high strength dual phase steels

journal contribution
posted on 2013-01-01, 00:00 authored by Alireza Asgari, H Ghadbeigi, C Pinna, Peter HodgsonPeter Hodgson
Multiscale modelling of stress and strain partitioning in DP steel was carried out using both realistic microstructure-based RVE models as well as stochastic microstructures generated by Monte Carlo method. The stochastic microstructure models were shown to resemble that of realistic microstructures, enabling research on the specific aspects of the microstructure that could be difficult to control and study during experimental work. One such feature of the realistic microstructures studied in this work was the grain size and microstructure morphology. The microstructures were generated with varying average grain sizes while all other parameters, such as boundary conditions, material properties and volume fractions of martensite and ferrite were kept constant. It is found that the effect of grain size is much more pronounced during the initial localisation of the plastic deformation at and around the interface of the phases. In addition, the decrease in ductility and increase in strength of the DP steels are directly related to the refinement of grain sizes of each phase and the stress-strain partitioning in between them.

History

Journal

Computer methods in materials science

Volume

12

Pagination

163 - 174

Publisher

AKAPIT

Location

Lodz, Poland

ISSN

1641-8581

Language

eng

Publication classification

C2 Other contribution to refereed journal

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