TY - JOUR
T1 - Enhancement of ballistic performance enabled by transformation-induced plasticity in high-strength bainitic steel
AU - Jo, Min Cheol
AU - Kim, Selim
AU - Suh, Dong Woo
AU - Kim, Hong Kyu
AU - Kim, Yong Jin
AU - Sohn, Seok Su
AU - Lee, Sunghak
N1 - Funding Information:
This work was supported by the Agency for Defense Development (grant No. UE161030GD ), the Korea University Grant for Dr. S.S. Sohn, and the BK21 Plus Project for Center for Creative Industrial Materials .
Funding Information:
This work was supported by theAgency for Defense Development (grant No. UE161030GD), the Korea University Grant for Dr. S.S. Sohn, and the BK21 Plus Project for Center for Creative Industrial Materials.
Publisher Copyright:
© 2021
PY - 2021/9/10
Y1 - 2021/9/10
N2 - High-strength bainitic steels have created a lot of interest in recent times because of their excellent combination of strength, ductility, toughness, and high ballistic mass efficiency. Bainitic steels have great potential in the fabrication of steel armor plates. Although various approaches and methods have been conducted to utilize the retained austenite (RA) in the bainitic matrix to control mechanical properties, very few attempts have been conducted to improve ballistic performance utilizing transformation-induced plasticity (TRIP) mechanism. In this study, high-strength bainitic steels were designed by controlling the time of austempering process to have various volume fractions and stability of RA while maintaining high hardness. The dynamic compressive and ballistic impact tests were conducted, and the relation between the effects of TRIP on ballistic performance and the adiabatic shear band (ASB) formation was analyzed. Our results show for the first time that an active TRIP mechanism achieved from a large quantity of metastable RA can significantly enhance the ballistic performance of high-strength bainitic steels because of the improved resistance to ASB formation. Thus, the ballistic performance can be effectively improved by a very short austempering time, which suggests that the utilization of active TRIP behavior via tuning RA acts as a primary mechanism for significantly enhancing the ballistic performance of high-strength bainitic steels.
AB - High-strength bainitic steels have created a lot of interest in recent times because of their excellent combination of strength, ductility, toughness, and high ballistic mass efficiency. Bainitic steels have great potential in the fabrication of steel armor plates. Although various approaches and methods have been conducted to utilize the retained austenite (RA) in the bainitic matrix to control mechanical properties, very few attempts have been conducted to improve ballistic performance utilizing transformation-induced plasticity (TRIP) mechanism. In this study, high-strength bainitic steels were designed by controlling the time of austempering process to have various volume fractions and stability of RA while maintaining high hardness. The dynamic compressive and ballistic impact tests were conducted, and the relation between the effects of TRIP on ballistic performance and the adiabatic shear band (ASB) formation was analyzed. Our results show for the first time that an active TRIP mechanism achieved from a large quantity of metastable RA can significantly enhance the ballistic performance of high-strength bainitic steels because of the improved resistance to ASB formation. Thus, the ballistic performance can be effectively improved by a very short austempering time, which suggests that the utilization of active TRIP behavior via tuning RA acts as a primary mechanism for significantly enhancing the ballistic performance of high-strength bainitic steels.
KW - Adiabatic shear band (ASB)
KW - Ballistic performance
KW - High-strength bainitic steel
KW - Retained austenite (RA)
KW - Split Hopkinson pressure bar (SHPB)
KW - Transformation-induced plasticity (TRIP)
UR - http://www.scopus.com/inward/record.url?scp=85101360900&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2020.12.059
DO - 10.1016/j.jmst.2020.12.059
M3 - Article
AN - SCOPUS:85101360900
SN - 1005-0302
VL - 84
SP - 219
EP - 229
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -