In situ neutron diffraction measurement of strain relaxation in welds during heat treatment
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Date
2016-12-11
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Online
Abstract
Neutron diffraction (ND) is commonly used to investigate the stress redistribution before and after post-weld heat treatment (PWHT) in welded structures. However, there is a lack of information on the evaluations of strains during PWHT. The present work employed in situ ND to measure the relaxation of residual strains during conventional PWHT in multi-pass high-strength low-alloy steel welds. It was found that strain relaxation occurs principally during the heating stage of the heat treatment. The findings have important economic bearings and can be used to characterise comparable material combinations and optimise the PWHT process for high-strength low-alloy weld joints. This unique information also provides a valuable benchmark for the finite element modelling of this complex process. © 2021 Informa UK Limited
Description
Keywords
Neutron diffraction, Residual stresses, In-situ processing, Heat treatments, Microstructure, Low alloy steels, Strains, Stress relaxation, Hardness, Scattering
Citation
Alipooramirabad, H., Paradowska, A., Lavigne, O., Ghomashchi, R., & Reid, M. (2016). In situ neutron diffraction measurement of strain relaxation in welds during heat treatment. Science and Technology of Welding and Joining, 22(6), 484-495. doi:10.1080/13621718.2016.1263437