Microscopic observations of adiabatic shear bands in three different steels |
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Authors: | K Cho Y C Chi J Duffy |
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Affiliation: | (1) Research Institute of Science and Technology, Pohang, Korea;(2) Bell Telephone Laboratories, Holmdel, NJ;(3) Division of Engineering, Brown University, 02912 Providence, RI |
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Abstract: | Microscopic observations are made of the shear band material in three different steels: (1) an AISI 1018 cold-rolled steel
(CRS), (2) a structural steel (HY-100), and (3) an AISI 4340 vacuum arc remelted (VAR) steel tempered to either of two hardnesses,
RHC 44 or 55. To produce the shear bands, specimens were subjected to large shear strains at relatively high strain rates,
≈103/s, resulting in essentially adiabatic deformation conditions. It was found that whenever the shear band led to fracture of
the specimen, the fracture occurred by a process of void nucleation and coalescence; no cleavage was observed on any fracture
surface, including the most brittle of the steels tested (RHC = 55). This is presumably due to the softening of the shear
band material that results from the local temperature rise occurring during dynamic deformation. Differences in shear band
behavior between the various microstructures are also described.
Formerly Research Assistant, Brown University |
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