Abstract
The effects of plastic deformation and cyclic loading on residual stress distribution have been studied at welds in high strength 800 MPa steel. Effects of residual stress levels on fatigue life are also presented. Tensile loading was used to induce precisely controlled plastic deformation at weld toes. Residual stress distributions were measured by neutron diffraction. The influence of fatigue loading on the residual stress level was much smaller than that of plastic deformation. A large drop of residual stresses in the vicinity of the welds was recognised after local straining at the level of 2%. Stresses decreased with up to 550 MPa in the region around the weld toe. The effect of local plastic deformation on fatigue properties was also found to be significant. Fatigue strength more than doubled compared to the non-strained as-welded condition.
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Acknowledgments
Experiments were carried out in NPI Řež in the frame of the FP7-NMI3 Programme—ACCESS to Large Facilities. Materials research studies are supported by the projects AV0Z10480505 and MSM2672244501. SSAB Oxelösund AB kindly provided the steel for this study.
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L’uboš, M., Karlsson, L., Ivan, H., Pavol, M., Miroslav, V. (2010). Influence of Plastic Deformation on the Residual Stress Distribution and Fatigue Behaviour of High Strength Steels Welds. In: Kannengiesser, T., Babu, S., Komizo, Yi., Ramirez, A. (eds) In-situ Studies with Photons, Neutrons and Electrons Scattering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14794-4_13
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DOI: https://doi.org/10.1007/978-3-642-14794-4_13
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