Dislocation characterization in cold rolled stainless steel using nonlinear ultrasonic techniques: A comprehensive model
School of Mechanical and Power Engineering, East China University of Science and Technology Shanghai 200237, PRC
Received: 8 August 2013
Accepted: 10 September 2013
Both dislocation density and character in cold rolled stainless steel cause the change of acoustic nonlinearity. An analytical model considering the different oscillating motion of edge and screw dislocations is presented for the generation of ultrasonic harmonic wave during the process of multiplication and motion of dislocation. Results reveal that the edge dislocation induces stronger acoustic nonlinearity response than screw dislocation. The new model is certified by the application to the cold rolled stainless steel.
PACS: 81.40.Ef – Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization / 61.72.Ff – Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.) / 43.25.+y – Nonlinear acoustics
© EPLA, 2013