The effect of vanadium micro-alloying on the microstructure and the tensile behavior of TWIP steel
- Authors
- Gwon, Hojun; Kim, Jin-Kyung; Shin, Sunmi; Cho, Lawrence; De Cooman, Bruno C.
- Issue Date
- Jun-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- TWIP steel; Micro-alloying; Precipitation; Mechanical property; Constitutive modeling
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.696, pp.416 - 428
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 696
- Start Page
- 416
- End Page
- 428
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/9540
- DOI
- 10.1016/j.msea.2017.04.083
- ISSN
- 0921-5093
- Abstract
- The effect of V addition on the microstructure and the tensile behavior of Fe-17Mn-0.45C-1.5A1-1Si-xV TWIP steel was investigated. The V additions contributed to a reduction of the grain size and an increase of the yield strength of the TWIP steels. The size distribution of various precipitates in the V-added steel, i.e. VC, TiC-VC co precipitates and TiC, was investigated. The yield strength of the V-added steel was modelled by considering the effect of the Peierls lattice friction, solid solution strengthening, grain size refinement strengthening and precipitation hardening by the Ashby-Orowan mechanism. Electron backscattering diffraction (EBSD) microstructure analysis and constitutive modeling revealed a slight difference of the twinning behavior in the V-free and V-added steel. While a higher twinning activity was observed in the V-added steel in the early stages of deformation, more twinning was observed in the V-free steel at higher strains. It is argued that the smaller grain size in the V-added steel leads to higher localized stresses at the grain boundaries as compared to the coarser grained V-free steel, and that these higher stresses facilitate grain boundary nucleation of deformation twins in the V-added steel.
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