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Cited 5 time in webofscience Cited 7 time in scopus
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Understanding of adiabatic shear band evolution during high-strain-rate deformation in high-strength armor steel

Authors
Jo, Min CheolKim, SelimKim, Dae WoongPark, Hyung KeunHong, Sung SukKim, Hong KyuKim, Hyoung SeopSohn, Seok SuLee, Sunghak
Issue Date
10-12월-2020
Publisher
ELSEVIER SCIENCE SA
Keywords
High-strength armor steel; Adiabatic shear band; Split hopkinson pressure bar; Ballistic impact; Dynamic recrystallization
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.845
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
845
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/50820
DOI
10.1016/j.jallcom.2020.155540
ISSN
0925-8388
Abstract
The microstructural evolution and formation mechanism of adiabatic shear band (ASB) in a high-strength armor steel were investigated using a laboratory-scale split Hopkinson pressure bar, and the results were correlated with the actual ballistic impact behavior. The interrupted dynamic compressive test results reveal that a deformed ASB (dASB) starts to form right after the stress collapse and it develops into a transformed ASB (tASB). In the ballistic impact, wide tASBs form mostly at the perforated surface, and narrower tASBs are branched from the tASB. Very fine equiaxed grains of similar to 190 nm in the tASB developed during the dynamic compression indicates that the dynamic recrystallization occurs even in 86.5 mu s, and then the grains grow up to 260 nm in 9.5 mu s. Rotational dynamic recrystallization mechanism and grain-growth rate model were proposed based on the calculation of temperature rise from a thermo-elasto-plastic finite element method, which provide a reasonable explanation for the formation and growth of fine equiaxed grains during both the dynamic compression and ballistic impact. A linkage of equiaxed subgrains and elongated parent subgrains demonstrates that the equiaxed subgrains did not evolve from nucleation and growth processes but from the sub-boundary rotation. Based on the underlying formation mechanisms and kinetics of ASBs, this study would suggest a reliable method to interpret the ASB formation and associated fracture mechanism during the ballistic impact. (C) 2020 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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