TY - JOUR
T1 - Effects of Al addition on tensile properties of partially recrystallized austenitic TRIP/TWIP steels
AU - Jo, Min Chul
AU - Jo, Min Cheol
AU - Zargaran, Alireza
AU - Sohn, Seok Su
AU - Kim, Nack J.
AU - Lee, Sunghak
N1 - Funding Information:
This work was supported by the Korea University Grant for the fourth author, and the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3/4
Y1 - 2021/3/4
N2 - 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 ε-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.
AB - 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 ε-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.
KW - High-Mn austenitic Steels
KW - Partial recrystallization
KW - Serrated flow
KW - Transformation-induced plasticity (TRIP)
KW - Twinning-induced plasticity (TWIP)
UR - http://www.scopus.com/inward/record.url?scp=85100251405&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.140823
DO - 10.1016/j.msea.2021.140823
M3 - Article
AN - SCOPUS:85100251405
SN - 0921-5093
VL - 806
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 140823
ER -