Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Influence of Dislocation Substructure on Ultrasonic Velocity under Tensile Deformation

  • Kim, C.S. (Engineering Science and Mechanics, Pennsylvania State University) ;
  • Lissenden, Cliff J. (Engineering Science and Mechanics, Pennsylvania State University) ;
  • Kang, Kae-Myhung (Department of Materials Science and Engineering, Seoul National University of Technology) ;
  • Park, Ik-Keun (Department of Mechanical Engineering, Seoul National University of Technology)
  • Published : 2008.12.30
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Abstract

The influence of dislocation substructure of metallic materials on ultrasonic velocity has been experimentally investigated. The test materials of pure Cu, brass (Cu-35Zn), 2.25Cr-1Mo steel, and AISI 316 with different stacking fault energy (SFE) are plastically deformed in order to generate dislocation substructures. The longitudinal wave velocit $(C_L)$ decreases as a function of tensile strain in each material. The $C_L$ of Cu-35Zn and AISI 316 decreases monotonously with tensile strain, but $C_L$ of Cu and 2.25Cr-1Mo steel shows plateau phenomena due to the stable dislocation substructure. The variation of ultrasonic velocity with the extent of dislocation damping and dislocation substructures is discussed.

Keywords

References

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