A study of local deformation and damage of dual phase steel
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Author list: Sirinakorn T., Wongwises S., Uthaisangsuk V.
Publisher: Elsevier
Publication year: 2014
Journal: Materials & Design (0264-1275)
Volume number: 64
Start page: 729
End page: 742
Number of pages: 14
ISSN: 0264-1275
eISSN: 1873-4197
Languages: English-Great Britain (EN-GB)
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Abstract
Deformation and fracture behavior of Dual Phase (DP) high strength steel were investigated by means of a microstructure based Finite Element (FE) modeling. Representative Volume Elements (RVEs) were applied to consider effects of various microstructure constituents and characteristics. Individual stress-strain curves were provided for ferrite, martensite as well as transformation induced Geometrically Necessary Dislocations (GNDs) taking into account in the RVEs. Principally, the GNDs occurred around phase boundaries during quenching process due to the austenite-martensite transformation. Flow behaviors of individual phases were defined on the basis of dislocation theory and partitioning of local chemical composition. Then, flow curves of the examined DP steel were predicted. Furthermore, the Gurson-Tvergaard-Needleman (GTN) model was used to represent ductile damage evolution in the microstructure. Occurrences of void initiation were characterized and damage parameters for RVE simulations were hence identified. Finally, influences of the GNDs, local stress and strain distributions and interactions between phases on predicted crack initiation in the DP microstructure were discussed and correlated with experimental results. ฉ 2014 Elsevier Ltd.
Keywords
Gurson Tvergaard Needleman damage model, Local crack initiation, Transformation-induced geometrically necessary dislocations
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