Residual stress investigations on a hot-rolled plane sandwich-type composite X5 Cr Ni 18 9-C45-X5 Cr Ni 189 by means of neutron diffraction

Abstract

The residual stresses in the three layers of a composite averaged over the layer thickness were determined by means of neutron diffraction experiments using the Fourier stress spectrometer (FSS) at GKSS Forschungszentrum Geesthacht (Germany). For stress analysis, the lattice strains of many different Bragg reflections have to be measured in the directions along and normal to the rolling direction employed during fabrication of the composite. These results have been compared with residual stress measurements using the ring-core method (RCM) performed at the IFAM (Fraunhofer Institut für Angewandte Materialforschung), Bremen. In addition to the stress states in the rolling and transverse directions, averaged over the whole thickness, the normal components of the stress tensor in the different layers of the composite—which are not detectable by RCM—have been investigated by neutron diffraction.