The residual stresses on the surface of a rail joined by flash-butt welding are measured using a hole-drilling method and the thermal elastic-plastic deformation process considering the phase transformation are simulated using FEM code JWRIAN. The residual stresses measured by experiments and computed by FEM have an acceptable agreement in accuracy. It can be understood from the computed results that the phase transformation plays an important role for the residual stress distribution caused by flash butt welding. By comparing the computed results and experimental results, some conclusions could be drawn as follows: (1) The computed residual stresses with and without the consideration of the phase transformation are quite different. The model with the phase transformation gave a good result compared with measurement. Therefore, the phase transformation could not be neglected in the simulation of residual stresses produced by flash butt welding. (2) The bi-axial tensile stress state in the web of welded rail joint increases risk of cracks. (3) The generation of Martensite during welding and cooling decreases residual tensile stress of joints. However, Martensite increases the metallurgical brittleness of joints at the same time. So in the real manufactures, the advantage and disadvantage of Martensite should be considered comprehensively.
Residual stresses in flash butt welded rail
Restspannungen in einer abbrennstumpfgeschweißten Schiene
Transactions of JWRI (Japan Welding Research Institute) ; 40 , 1 ; 79-87
2011
9 Seiten, 28 Bilder, 3 Tabellen, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
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