Experimental determination of the residual stresses in a spiral weld overlay tube

Neutron diffraction was used to determine the residual stresses in a spiral weld overlay tube. The specimen was a 2.5 in. OD carbon steel tube covered with a layer of alloy 625 weld overlay. Residual strains in the carbon steel and weld overlay layers were determined using the ferritic (211) and aus...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1997-07, Vol.232 (1), p.31-38
Main Authors: Wang, X.-L., Payzant, E.A., Taljat, B., Hubbard, C.R., Keiser, J.R., Jirinec, M.J.
Format: Article
Language:English
Subjects:
Analysing. Testing. Standards
Applied sciences
Exact sciences and technology
Metals. Metallurgy
Neutron diffraction
Residual stresses
Stress analysis
Weld overlay
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cited_by cdi_FETCH-LOGICAL-c367t-81281bc5d3d5e34a8aacb5db90ebabf4cd4c0e274cf972184ce5137531c3cc963
cites cdi_FETCH-LOGICAL-c367t-81281bc5d3d5e34a8aacb5db90ebabf4cd4c0e274cf972184ce5137531c3cc963
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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creator Wang, X.-L.
Payzant, E.A.
Taljat, B.
Hubbard, C.R.
Keiser, J.R.
Jirinec, M.J.
description Neutron diffraction was used to determine the residual stresses in a spiral weld overlay tube. The specimen was a 2.5 in. OD carbon steel tube covered with a layer of alloy 625 weld overlay. Residual strains in the carbon steel and weld overlay layers were determined using the ferritic (211) and austenitic (311) reflections, respectively. The residual stresses in each material were derived from the measured strains using Hooke's law and appropriate elastic constants. Tensile stress regions were found not only in the weld metal but also in the heat-affected zone in the carbon steel. The maximum tensile stress was located in the weld overlay layer and amounted to 360 MPa, about 75% of the 0.2% yield strength of the weld metal. The experimental data were compared with a finite element analysis based on an uncoupled thermal-mechanical formulation. Overall, the modeling results are in satisfactory agreement with the experimental data, although the hoop strain (stress) seems to have been overestimated by the finite element model. Additional neutron diffraction measurements reveal that these welding residual stresses vanished after annealing at 900°C for 20 min.
doi_str_mv 10.1016/S0921-5093(97)00089-0
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subjects Analysing. Testing. Standards
Applied sciences
Exact sciences and technology
Metals. Metallurgy
Neutron diffraction
Residual stresses
Stress analysis
Weld overlay
title Experimental determination of the residual stresses in a spiral weld overlay tube
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