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Intergranular strains in pre-strained and welded pipes

Acar, M. O.; Bouchard, P. John; Quinta da Fonseca, Joao; Fitzpatrick, Michael E. and Gungor, Salih (2010). Intergranular strains in pre-strained and welded pipes. Materials Science Forum, 652 pp. 13–18.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.4028/www.scientific.net/MSF.652.13
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Abstract

Neutron diffraction has been used to investigate the weld residual stresses and the intergranular residual strains in butt-welded 316H pipes. Measurements have been made on pipes subjected to varying degrees of plastic pre-straining before welding, in order to assess the effects of plastic strain on the weld residual stresses and the intergranular strains in the material. The intergranular strains following plastic deformation will also be affected by the annealing effect of the welding. Pipes were initially prepared with plastic strain of 0, 10, 15, 20 and 25% plastic deformation. Thereafter, the pipes were cut in half and welded with a circumferential butt-weld. Bar specimens were extracted from the remote end of the 0, 10, 15, 20 and 25% pre-strained and welded pipes. Cross-weld bar specimens were also machined from the 0 and 20% pre-strained and welded pipes. Neutron diffraction measurements were made at ENGIN-X, ISIS and FRM-II, Munich. The aim of this paper is to evaluate the intergranular strains developed after pre-straining from measurements made in remote bar specimens from the remote-end of the pipes. The annealing effect of the welding cycle on the intergranular strains is also studied, with measurements done at several points on cross-weld bar specimens, obtaining the strain response of different hkl lattice planes. The results show that the {200} and {220} planes are at the extremes of response during loading. Furthermore, the welding thermal cycling relaxed the intergranular strains from the prior plastic deformation.

Item Type: Journal Article
Copyright Holders: 2010 Trans Tech Publications, Switzerland
ISSN: 0255-5476
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetBritish Energy
Not SetNot SetLloyd's Register Educational Trust (LRET)
Keywords: intergranular residual strain; neutron diffraction; plastic deformation; weld residual stress
Academic Unit/Department: Mathematics, Computing and Technology
Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 26396
Depositing User: Salih Gungor
Date Deposited: 20 Jan 2011 11:46
Last Modified: 10 Dec 2012 11:10
URI: http://oro.open.ac.uk/id/eprint/26396
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