Enhancement of ballistic performance enabled by transformation-induced plasticity in high-strength bainitic steel  

作　　者：Min Cheoljo Selim Kim Dong Woo Suh Hong Kyu Kim Yongjin Kim Seok Su Sohn Sunghak Lee 

机构地区：[1]Center for Advanced Aerospace Materials,Pohang University of Science and Technology,Pohang,37673,South Korea [2]Graduate Institute of Ferrous Technology,Pohang University of Science and Technology,Pohang,37673,South Korea [3]Materials Directorate,Agency for Defense Development,Daejeon,305-600,South Korea [4]Department of Materials Science and Engineering,Korea University,Seoul,02841,South Korea

出　　处：《Journal of Materials Science & Technology》2021年第25期219-229,共11页材料科学技术（英文版）

基　　金：supported by the Agency for Defense Development(grant No.UE161030GD);the Korea University Grant for Dr.S.S.Sohn;the BK21 Plus Project for Center for Creative Industrial Materials。

摘　　要：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 transformationinduced 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.

关 键 词：High-strength bainitic steel Ballistic performance Split Hopkinson pressure bar(SHPB) Adiabatic shear band(ASB) Retained austenite(RA) Transformation-induced plasticity(TRIP) 

分 类 号：TG142.1[一般工业技术—材料科学与工程]