Analysis of the tensile behavior of a TWIP steel based on the texture and microstructure evolutions

Abstract : The texture and microstructure evolutions of a fine-grained TWIP steel subjected to tensile tests at room temperature were investigated in relation to the mechanical behavior. This steel combines both high duc-tility and strength owing to the TWIP effect. Also the steel exhibits a high strain hardening rate that evolves according to five stages, which are related to the microstructure and texture evolutions and characteristics. The formation of nano-twins in the initial stage of deformation leads to an increase in strain hardening rate. The development of the pronounced <1 1 1> fiber in the tensile direction sustains mechanical twinning and maintains the strain hardening rate on a high level. The resulting microstructure exhibits several types of twin configurations and sub-boundaries with high misorientations due to intense activities of dislocation glide. The twin volume fraction was estimated to be 9% at the final stage of tensile deformation. The new orientations generated by mechanical twinning do not change considerably the final texture.
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David Barbier, Nathalie Gey, Sébastien Allain, Nathalie Bozzolo, Michel Humbert. Analysis of the tensile behavior of a TWIP steel based on the texture and microstructure evolutions. Materials Science and Engineering: A, Elsevier, 2009, 500 (1-2), pp.196 - 206. ⟨10.1016/j.msea.2008.09.031⟩. ⟨hal-02401417⟩

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