Evaluation of the heat-affected zone (HAZ) of a weld joint using nonlinear Rayleigh waves

Christoph Doerr, Alexander Lakocy, Jin Yeon Kim, Preet M. Singh, James J. Wall, Jianmin Qu, Laurence J. Jacobs

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Nonlinear ultrasound (NLU) has been shown to be sensitive to microstructural features including precipitates and dislocations. The heat-affected zone (HAZ) of welded austenitic stainless steels can be susceptible to intergranular stress corrosion cracking (IGSCC). This research uses NLU to evaluate the microstructure of the HAZ with an emphasis on dislocations, precipitates, grain size/morphology and sensitization, which is the formation of chromium carbide precipitates at the grain boundaries. The results show that there is a large increase in the measured acoustic nonlinearity parameter in the vicinity of the HAZ, which can be used to monitor changes in microstructure such as sensitization.

Original languageEnglish
Pages (from-to)221-224
Number of pages4
JournalMaterials Letters
Volume190
DOIs
StatePublished - 1 Mar 2017

Keywords

  • Austenitic steels
  • Microstructure
  • Nonlinear ultrasonics
  • Sensitization
  • Welding

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