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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/4904

Title: Residual stress measurements in a ferritic steel/In625 superalloy dissimilar metal weldment using neutron diffraction and deep-hole drilling
Authors: Skouras, A
Paradowska, A
Peel, MJ
Flewitt, PEJ
Pavier, MJ
Keywords: NEUTRON DIFFRACTION
RESIDUAL STRESSES
DRILLING
TEXTURE
WELDING
HEAT RESISTING ALLOYS
Texture
Issue Date: 1-Jan-2013
Publisher: Elsevier Science Ltd.
Citation: Skouras, A., Paradowska, A., Peel, M. J., Flewitt, P. E. J., & Pavier, M. J. (2013): Residual stress measurements in a ferritic steel/In625 superalloy dissimilar metal weldment using neutron diffraction and deep-hole drilling. International Journal of Pressure Vessels and Piping, 101, 143-153.
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. © 2013, Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.ijpvp.2012.11.002
http://apo.ansto.gov.au/dspace/handle/10238/4904
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