Improved strength of a medium -Mn steel by V addition without sacrificing ductility
- Authors
- Park, Tak Min; Jeong, Mun Sik; Jung, Chanwon; Choi, Won Seok; Choi, Pyuck-Pa; Han, Jeongho
- Issue Date
- Jan-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Medium-Mn steel; Twinning-induced plasticity; Transformation-induced plasticity; Precipitation hardening; Dynamic strain aging
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.802, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 802
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1627
- DOI
- 10.1016/j.msea.2020.140681
- ISSN
- 0921-5093
- Abstract
- ere, we investigated the effects of adding a micro-alloying element to medium-Mn steel and explored why a resulting sample containing precipitates exhibited higher strength than one without precipitates, without sacrificing ductility. The model alloys comprised steels of Fe-8Mn-0.2C-3Al-(0, 0.2)V (wt.%); they were cold-rolled and intercritically annealed at identical temperatures between 670 and 730 degrees C for 30 min. These annealed steels exhibited two-phase microstructures consisting of ferrite (alpha) and retained austenite (gamma(R)), with a nanoscale globular morphology. Smaller grain sizes and lower volume fractions of gamma(R) were observed in the V-containing specimen, relative to the V-free specimen, owing to the formation of VC precipitates. The latter were mostly formed in the alpha phase, rather than in the gamma(R) phase. These VC precipitates meant that the V-containing steel showed a lower C concentration in gamma(R) and a higher C concentration in alpha than the V-free steel. We propose that such phase compositions enhanced the strain hardening rate during the later stage of mechanical loading due to more active twinning-induced plasticity and dynamic strain aging. These effects resulted in the observed higher tensile strength in the V-containing steel, without sacrificing ductility.
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