Enhancement of ballistic performance enabled by boron-doping in subzero-treated (ferrite plus austenite plus martensite) triplex lightweight steel
- Authors
- Kim, Dae Woong; Kim, Selim; Yang, Junha; Lee, Sunghak; Sohn, Seok Su
- Issue Date
- 8월-2022
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Medium-Mn lightweight steel; Ballistic performance; Boron-doping; Adiabatic shear band (ASB); Split Hopkinson pressure bar (SHPB)
- Citation
- MATERIALS CHARACTERIZATION, v.190
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 190
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/142890
- DOI
- 10.1016/j.matchar.2022.112021
- ISSN
- 1044-5803
- Abstract
- 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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