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Residual stresses after laser surface remelting
Grum, Janez, 1946- ; Šturm, Roman, 1965-
ǂThe ǂmeasurement of residual stresses is very important in exacting dynamically loaded machine parts which have been subjected to different kinds of heat treatment. In designing parts 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 specimens from nodular iron 400-12. To measure the residual stresses, the relaxation method was used, including gradual electro-chemical removal of the hardened layer in which the deformation of the specimen was measured by resistance strain gauges. On the basis of the measured deformation at a specific depth of material removal, it is possible to calculate the size or variation of residual stresses on the depth of the modified layer. The results of the measured residual stresses confirm that the stresses strongly depend on the laser surface remelting conditions.
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