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  • Experimental determination of the residual stresses in a spiral weld overlay tube
    Wang, X.-L. ...
    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 constant. 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 modelling results are in satisfactory agreement with the experimental data, although the hoop strain (stress) seams to have been overestimated by the finite element model. Additional neutron diffraction measurements reveal that these welding residual stresses vanished after annealing at 900 degrees C for 20 min.
    Vir: Materials Science & Engineering. A, Structural materials: Properties, Microstructure and Processing. - ISSN 0921-5093 (Vol. 232, No. 1/2, 1997, str. 31-38)
    Vrsta gradiva - članek, sestavni del
    Leto - 1997
    Jezik - angleški
    COBISS.SI-ID - 368321

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