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Microscopic observations of adiabatic shear bands in three different steels

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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.

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Author information

Authors and Affiliations

  1. Research Institute of Science and Technology, Pohang, Korea

    K. Cho (Research Scientist)

  2. Bell Telephone Laboratories, Holmdel, NJ

    Y. C. Chi (Member of Technical Staff)

  3. Division of Engineering, Brown University, 02912, Providence, RI

    J. Duffy (Professor of Engineering)

Authors
  1. K. Cho
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  2. Y. C. Chi
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  3. J. Duffy
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Formerly Research Assistant, Brown University

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Cho, K., Chi, Y.C. & Duffy, J. Microscopic observations of adiabatic shear bands in three different steels. Metall Trans A 21, 1161–1175 (1990). https://doi.org/10.1007/BF02656536

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  • DOI: https://doi.org/10.1007/BF02656536

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