Einfluß eines Konzentrationsgradienten bei röntgenographischen Spannungsmessungen

Influence of a Gradient of Composition on X-Ray Stress Analysis In the last years several factors were shown which lead to nonlinear sin²Ψ-distributions in x-ray stress analysis, like rotation of the principal stresses with respect to the normal to surface, steep stress gradients under the surface and a texture in the material under investigation. A fourth factor is revealed which becomes active, when gradients of the composition are present. In case of a chromized Fe-sample the influence on x-ray stress analysis is shown by measurement and theoretically as well. A method of correction is introduced, which is checked by use of a model sample. The x-ray residual stresses of the chromized Fe-sample are in accordance with such ones determined mechanically.