Work hardening behaviour in banded dual phase steel structures with improved formability

In this work, we show how the presence of microstructural banding and segregation affects the work-hardening behaviour of a dual phase steel with improved formability. This steel contains chemical segregation inherited from the casting process. Our previously developed 3D cellular automaton model al...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.713, p.278-286
Main Authors: Ennis, B.L., Bos, C., Aarnts, M.P., Lee, P.D., Jimenez-Melero, E.
Format: Article
Language:English
Subjects:
Austenite
Banding
Casting
Cellular automata
Dual phase steels
Duplex stainless steels
Ferritic stainless steels
Formability
Hardening
Martensite
Martensitic stainless steel
Mechanical characterization
Mechanical tests
Organic chemistry
Reduction
Steel
Steel structures
Strain hardening
Strain localization
Tensile strength
Thermo-mechanical processing
Thermomechanical treatment
Three dimensional models
Ultimate tensile strength
Work hardening
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Summary:In this work, we show how the presence of microstructural banding and segregation affects the work-hardening behaviour of a dual phase steel with improved formability. This steel contains chemical segregation inherited from the casting process. Our previously developed 3D cellular automaton model allowed us to design thermo-mechanical processes to either promote or suppress banding. The bands are properly described as in-plane sheets of martensite grains. Mechanical testing data revealed a significant reduction in tensile strength in banded structures for a similar level of ductility. The work-hardening behaviour in the pre-yield regime, including the yield strength itself, is not correlated to the incidence of segregation and/or microstructural banding. The reduction in ultimate tensile strength in banded structures stems from a reduced work-hardening capacity in the post-yield regime. This is due to increased austenite stability in the banded steels, coupled to the anisotropic strain localisation in the ferritic matrix between martensite bands.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.12.078