M. Defreitas et al., ANALYSIS OF RESIDUAL-STRESSES INDUCED BY LASER PROCESSING, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 167(1-2), 1993, pp. 115-122
A model for the analysis of residual stresses induced by laser coating
s, involving the transition to the liquid state, is presented. The res
idual stresses due to the thermal gradient associated with laser harde
ning are analysed using a thermo-elastic-plastic finite element comput
er code, with isoparametric bidimensional elements in plane strain con
ditions. The heating and cooling cycle describing the thermal history
was obtained from a previous finite difference thermal model. Since th
e complex composite alloys created with the coating have unknown therm
omechanical properties, the model was checked for specimens treated wi
thout powder injection, for which the residual stresses were measured
by X-ray diffraction. The experimental stress results are consistent w
ith the calculations.