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X-ray stress investigation and microhardness analysis in the surface layer of steels after laser treatment and subsequent grinding.

100%

Ganev N. , Kraus I. , Siegl J. , Gosmanova G.

tom R. XIX, nr 4

1031-1034

Although laser treatment of certain metals may enhance the wear performance, in general it may result equally well in large residual stresses which have a determinal effect on the wear performance. Tensile stresses generated in the surface layer may lead to severe cracking of the material. this paper deals with studies on residual stresses and microhardness after laser treatment of steel samples with single laser tracks and of samples with multiple overlapping laser tracks. Residual stress distributions across the hardened tracks were measured by means of X-ray diffraction. It has been found that compressive stresses exist in the hardened zone of all the specimens studied. The microhardness increased by as much as 350%.