Enhancement of ballistic performance enabled by boron-doping in subzero-treated (ferrite plus austenite plus martensite) triplex lightweight steel

被引：6
作者：
Kim, Dae Woong [1 ]
Kim, Selim [2 ]
Yang, Junha [2 ]
Lee, Sunghak [3 ]
Sohn, Seok Su [4 ]
机构：
[1] Res Inst Ind Sci & Technol, Anal & Assessment Grp, Pohang 37673, South Korea
[2] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 37673, South Korea
[3] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 37673, South Korea
[4] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea
来源：
MATERIALS CHARACTERIZATION | 2022年 / 190卷
关键词：
Medium-Mn lightweight steel; Ballistic performance; Boron-doping; Adiabatic shear band (ASB); Split Hopkinson pressure bar (SHPB); TRANSFORMATION-INDUCED PLASTICITY; ADIABATIC SHEAR BANDS; HIGH-STRAIN RATE; RETAINED AUSTENITE; PHASE-TRANSFORMATION; TENSILE PROPERTIES; GRAIN-SIZE; FRACTURE; TEMPERATURE; STRENGTH;
D O I：
10.1016/j.matchar.2022.112021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Investigations of dynamic deformation and ballistic performance of ultra-high-strength lightweight steels for steel armor applications have not been conducted to date. In this study, effects of boron(B)-doping on ballistic performance were explored in subzero-treated Fe-0.3C-9Mn-5Al and Fe-0.3C-9Mn-5Al-0.005B (wt%) lightweight steels in relation to band structures and B segregation. The dynamic deformation and adiabatic shear band (ASB) formation behaviors were examined by a Hopkinson pressure bar (SHPB). The band structure is critical in inhibiting ASB propagation, as it is continuously blocked at tempered-martensite/ferrite boundaries. The crack propagates along the embrittled ASB and penetrates into tempered-martensite/ferrite boundaries, producing delamination of elongated grains in the undoped steel. On the other hand, the delamination does not occur in the B-doped steel because the segregation of solute B at prior austenite grain boundaries enhances the grainboundary cohesion. Thus, the B-doped steel outperforms conventional rolled homogeneous armor steels and the undoped steel as well, providing a significant deal of potential for developing excellent ballistic-performance lightweight steel armors.
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页数：12
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