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Complex X-ray study of effects of mechanical surface treatment in shot-peened steels

100%

Ganev N. , Skrzypek S. J. , Sedlák P.

tom R. XXV, nr 3

576-578

Beneficial residual stress (RS) level and strain hardening are very important properties of surface layers obtained after shot penning. Both characteristic features have non-uniform distribution and their description is important for defining the achieved surface layers. The level and sign of residual stresses are influential parameters for mechanical properties of materials and for the structural behaviour of machine parts during external loading and exploitation. The aim of the contribution is to present acomparative X-ray diffraction analysis of residual stresses in shot-peened steel samples. Contemporaneous application of two experimental approaches, i.e. classical sin^2psi technique for depth profile stress determination (Czech Technical University in Prague) and modified g-sin^2psi method (AGH-University of Science and Technology, Cracow) provides complex structural characterisation of surface layers. The results obtained in both cooperating X-ray diffraction laboratories are in a good agreement and show promise.

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%.

X-ray stress analysis of residual stress gradients in surface layers of steels.

88%

Ganev N. , Kraus I. , Gosmanova G. , Pfeiffer L. , Tietz H. D.

tom R. XXII, nr 4

323-325

The aim of contribution is to present the theoretical possibilities of X-ray non destructive identification of stress gradients within the penetration depth of used radiation and its utilisation for experimental stress analysis. Practical usefulness of outlined speculations is illustrated with results of stress measurements on cut and shot-peened steel samples.