Residual stress measurements in a ferritic steel/In625 superalloy dissimilar metal weldment using neutron diffraction and deep-hole drilling

A. Skouras*, A. Paradowska, M. J. Peel, P. E. J. Flewitt, M. J. Pavier

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

23 Citations (Scopus)

Abstract

This paper reports the use of non-invasive and semi-invasive techniques to measure the residual stresses in a large dissimilar weldment. This took the form of a butt weld between two sections of a P92 steel pipe, joined using an In625 welding consumable. Residual stress measurements have been carried out on the 30 mm thick welded pipe using the deep-hole drilling technique to characterise the through wall section residual stress distribution for the weld metal, HAZ and parent material. In addition, neutron diffraction measurements have been carried out within the weld zone. Diffraction patterns presented a high intensity and sharp peaks for the base P92 steel material. However measurements in the weld superalloy material were proven problematic as very weak diffraction patterns were observed. A thorough examination of the weld material suggested that the likely cause of this phenomenon was texture in the weld material created during the solidification phase of the welding procedure. This paper discusses the challenges in the execution and interpretation of the neutron diffraction results and demonstrates that realistic measurements of residual stresses can be achieved, in complex dissimilar metal weldments. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)143-153
Number of pages11
JournalInternational Journal of Pressure Vessels and Piping
Volume101
DOIs
Publication statusPublished - Jan 2013

Keywords

  • Deep-hole drilling
  • Residual stresses
  • Neutron diffraction
  • Dissimilar weld
  • P92
  • In625
  • Texture

Cite this