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

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:500

Article

Barbier, D.^1,2  Gey, N.¹  Allain, S.³  Bozzolo, N.¹  Humbert, M.¹ 

[1] Univ Paul Verlaine Metz, CNRS, UMR 7078, LETAM, F-57000 Metz, France

[2] Univ Paul Verlaine Metz, CNRS, UMR 7078, LPMM, F-57000 Metz, France

[3] ArcelorMittal Res SA, F-57283 Maizieres Les Metz, France

关键词: Austenitic steel;    TWIP effect;    Tension test;    EBSD;    Deformation texture;   

DOI  :  10.1016/j.msea.2008.09.031

来源: Elsevier

【 摘 要 】

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 ductility 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 < 111 > 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. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

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