Microstructural study of adiabatic shear band formed by ballistic impact in an HY-100 steel
- Pohang Inst. of Science and Technology (Korea, Republic of). Dept. of Materials Science and Engineering
- Pusan National Univ. (Korea, Republic of). Dept. of Metallurgical Engineering
- Research Inst. of Industrial Science and Technology, Pohang (Korea, Republic of). Dept. of Steel Products
This article presents a study of the microstructural development of the adiabatic shear band in an HY 100 steel. The steel was deformed at a high strain rate by ballistic impact, and subsequent metallographic observations along with electron microscopy were performed. A number of white-etched shear bands were found near the perforated region, and three typical microstructural features of the adiabatic shear band were observed: elongated grain structure at the boundary between the shear band and matrix, fine equiaxed grain structure with high dislocation densities in the middle of the shear band, and relatively coarse-grained structure located between the above two structures. These microstructures might be formed in an extremely short time by the combined effects of the large temperature rise and the highly localized deformation. Since very complex phenomena might occur within the shear band. possible mechanisms, such as dynamic recovery and strain-induced dynamic phase transformation, are suggested to explain the microstructural development of the adiabatic shear band.
- OSTI ID:
- 5730037
- Journal Information:
- Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24A:10; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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