Effects of Al addition on tensile properties of partially recrystallized austenitic TRIP/TWIP steels
- Authors
- Jo, Min Chul; Jo, Min Cheol; Zargaran, Alireza; Sohn, Seok Su; Kim, Nack J.; Lee, Sunghak
- Issue Date
- 4-3월-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- High-Mn austenitic Steels; Partial recrystallization; Twinning-induced plasticity (TWIP); Transformation-induced plasticity (TRIP); Serrated flow
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.806
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 806
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/49484
- DOI
- 10.1016/j.msea.2021.140823
- ISSN
- 0921-5093
- Abstract
- Austenitic high-Mn steels are regarded as a promising candidate for high-strength cold-rolled steels because their combination of strength and ductility improves greatly by combined effects of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP). Although it is well known that Al plays key roles in tensile properties of austenitic TWIP steels, its effects in austenitic TRIP or TRIP/TWIP steel are still unclear yet. In this study, three austenitic steels (composition; 0.4C-15Mn-1Si-(0,0.5,1)Al-0.3Mo-0.5V (wt.%)) were fabricated, and the effect of Al alloying on microstructures and tensile properties were investigated in relation to the deformation behavior with TRIP and TWIP mechanisms. A partial recrystallization was conducted for enhancing the yield strength, which was characterized with electron backscatter diffraction (EBSD) grain orientation spread maps. The present steels showed 1 GPa of yield strength achieved by partial recrystallization with the precipitation of (V + Mo) complex carbides. Particularly in the non-Al-alloyed steel, the epsilon-martensite formed in the early deformation stage, and the martensitic transformation continued until the failure, thereby resulting in the highest tensile strength (1.5 GPa) along with the highest strain hardening.
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