Journal ArticleDOI
Microstructural study of adiabatic shear band
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TLDR
In this article, the microstructural development of the adiabatic shear band in an HY-100 steel was studied, and three typical micro-structural features were observed: elongated grain structure at the boundary between the shear bands and matrix, fine equiaxed grain structure with high dislocation densities in the middle of the hear band, and relatively coarse-grained structure located between the above two structures.Abstract:
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 micro- structural development of the adiabatic shear band.read more
Citations
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Shear Localization in Dynamic Deformation: Microstructural Evolution
TL;DR: In this article, the microstructural aspects of adiabatic shear localization are critically reviewed and a strain-rate-dependent critical strain for the development of shear bands is found.
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The properties of TiN films deposited by filtered arc evaporation
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Effects of martensite morphology and volume fraction on quasi-static and dynamic deformation behavior of dual-phase steels
Sangho Kim,Sunghak Lee +1 more
TL;DR: In this paper, the effects of martensite morphology and volume fraction on the quasi-static and dynamic deformation behavior of dual-phase steels were investigated using a torsional Kolsky bar for four steel specimens.
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On ultrahigh velocity micro-particle impact on steels—A single impact study
TL;DR: In this paper, a computational model is presented to investigate the ultra-high-velocity multiple particle impact process on steels, which uses a Monte Carlo framework to model the stochastic nature of the particle flow and the finite element (FE) method to model individual particle impact processes, while considering the thermal diffusion process.
References
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Book
Metal Forming: Mechanics and Metallurgy
TL;DR: In this paper, the authors present sheet metal properties including stress and strain, tension, and strain hardening, and anisotropic anisotropy for sheet metal forming, as well as other sheet forming operations.
Journal ArticleDOI
An experimental study of the formation process of adiabatic shear bands in a structural steel
A. Marchand,J. Duffy +1 more
TL;DR: In this article, a series of experiments were described in which the local temperature and local strain are measured during the formation of an adiabatic shear band in a low alloy structural steel (HY-100).
Journal ArticleDOI
Adiabatic Plastic Deformation
TL;DR: Adiabatic plastic deformation may play a role in such widely diverse areas as ballistic impact, explosive fragmentation, cryogenic behavior of materials, high velocity shaping and forming, machining, grinding 0), surface frictional effects, erosion, and seismic faulting as mentioned in this paper.
Journal ArticleDOI
Analytical Characterization of Shear Localization in Thermoviscoplastic Materials
Alain Molinari,Rodney J. Clifton +1 more
TL;DR: In this article, critical conditions for shear localization in thermoviscoplastic materials are obtained in closed form for idealized models of simple shearing deformations, which are viewed as quite acceptable for many applications in which shear bands occur.
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