Accurate modelling of anisotropic effects in austenitic stainless steel welds

O. D. Nowers, D. J. Duxbury, B. W. Drinkwater

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

The ultrasonic inspection of austenitic steel welds is challenging due to the formation of highly anisotropic and heterogeneous structures post-welding. This is due to the intrinsic crystallographic structure of austenitic steel, driving the formation of dendritic grain structures on cooling. The anisotropy is manifested as both a 'steering' of the ultrasonic beam and the back-scatter of energy due to the macroscopic granular structure of the weld. However, the quantitative effects and relative impacts of these phenomena are not well-understood. A semi-analytical simulation framework has been developed to allow the study of anisotropic effects in austenitic stainless steel welds. Frequency-dependent scatterers are allocated to a weld-region to approximate the coarse grain-structures observed within austenitic welds and imaged using a simulated array. The simulated A-scans are compared against an equivalent experimental setup demonstrating excellent agreement of the Signal to Noise (S/N) ratio. Comparison of images of the simulated and experimental data generated using the Total Focusing Method (TFM) indicate a prominent layered effect in the simulated data. A superior grain allocation routine is required to improve upon this.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
PublisherAmerican Institute of Physics (AIP)
Pages985-991
Number of pages7
Volume1581 33
ISBN (Print)9780735412118
DOIs
Publication statusPublished - 1 Jan 2014
Event40th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE 2013): Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 - Baltimore, MD, United States
Duration: 21 Jul 201326 Jul 2013
Conference number: 40

Conference

Conference40th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE 2013)
Abbreviated titleQNDE 2013
CountryUnited States
CityBaltimore, MD
Period21/07/1326/07/13

Keywords

  • Arrays
  • Austenitic steels
  • Beam-steering
  • Grain-scattering
  • Ultrasonics

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