Dependence of diffuse ultrasonic backscatter on residual stress in 1080 steel

Hualong Du; Joseph A Turner

doi:10.1016/j.ultras.2015.09.020

Dependence of diffuse ultrasonic backscatter on residual stress in 1080 steel

Ultrasonics. 2016 Apr:67:65-69. doi: 10.1016/j.ultras.2015.09.020. Epub 2015 Oct 23.

Authors

Hualong Du¹, Joseph A Turner²

Affiliations

¹ Mechanical and Materials Engineering, University of Nebraska-Lincoln, W342 Nebraska Hall, Lincoln, NE 68588, USA.
² Mechanical and Materials Engineering, University of Nebraska-Lincoln, W342 Nebraska Hall, Lincoln, NE 68588, USA. Electronic address: jaturner@unl.edu.

PMID: 26784273
DOI: 10.1016/j.ultras.2015.09.020

Abstract

In this article, the effects of residual stress on the ultrasonic scattering in a quenched steel sample are investigated by calculating the change of spatial variance amplitudes of ultrasonic signals after removing residual stress via annealing. The experimental results show that the average spatial variance amplitude decreases by about 11.89% for a scan area on the quenched surface after removing residual stress. This quantity was used to estimate the residual stress based on the developed stress-dependent backscatter model. In addition, the residual stress on the whole scan area was mapped by calculating the change of the spatial variance amplitude for each subarea after annealing, respectively. Diffuse ultrasonic backscatter signals show a high sensitivity to residual stress such that this technique has potential as a non-destructive method for measuring residual stress.

Keywords: Acoustoelasticity; Heat treatment; Residual stress; Ultrasonic attenuation; Ultrasonic scattering.