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Influence of laser remelting process parameters on residual stresses in nodular cast iron 500-7
Grum, Janez, 1946- ; Šturm, Roman, 1965-
The measurement of residual stresses is very important in dynamically loaded precision machine parts which have been subjected to different kinds of heat treatment. Designers very frequently demand ...the presence of compressive residual stresses after heat treatment and finish grinding of the surface, since this increases the fatigue strength of the material and reduces the danger of fracture. In this investigation of the residual stresses after laser surface remelting, the size and variation of residual stresses were measured as a function of the modified layer depth on flat samples from nodular cast iron. Optimal laser remelting conditions were chosen, while the way of guiding the laser beam over the surface of flat samples was varied. To measure residual stresses, the relaxation method was used, including gradual electrochemical removal of the modified layer in which the deformation of the specimen was measured by resistance strain gauges.
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