Paddea, S.; Francis, J. A.; Paradowska, A M; Bouchard, P. J. and Shibli, I. A.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1016/j.msea.2011.12.024|
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In this study the residual stresses in a pipe girth weld in a ferritic-martensitic power plant steel were measured by neutron diffraction and compared with the corresponding metallurgical zones in the weld region. It was found that, in both the as-welded and post-weld heat treated condition, the highest tensile stresses resided near the outer boundary of the heataffected zone (HAZ), and towards the weld root region. Substantial tensile direct and hydrostatic stresses existed across the HAZ, including the fine-grained and intercriticallyannealed regions, where premature type IV creep failures manifest in 9-12 Cr steel welds. Compressive stresses were found in the weld metal coinciding with the last weld bead to be deposited. Constrained cooling tests on test coupons illustrated that these compressive stresses can be explained in terms of the influence that solid-state phase transformations have on the accumulation of stress in welds.
|Item Type:||Journal Article|
|Copyright Holders:||2012 Materials Science and Engineering A|
|Academic Unit/Department:||Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
|Depositing User:||Anne Green|
|Date Deposited:||18 Jan 2012 09:30|
|Last Modified:||05 Oct 2016 04:06|
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