RESIDUAL-STRESS INVESTIGATIONS ON A HOT-ROLLED PLANE SANDWICH-TYPE COMPOSITE X5-CR NI-18-9 C45 X5-CR NI-18-9 BY MEANS OF NEUTRON-DIFFRACTION

The residual stresses in the three layers of a composite averaged over the layer thickness were determined by means of neutron diffraction e xperiments using the Fourier stress spectrometer (FSS) at GKSS Forschu ngszentrum Geesthacht (Germany). For stress analysis, the lattice stra ins of many different Bragg reflections have to be measured in the dir ections along and normal to the rolling direction employed during fabr ication of the composite. These results have been compared with residu al stress measurements using the ring-core method (RCM) performed at t he IFAM (Fraunhofer Institut fur Angewandte Materialforschung), Bremen . In addition to the stress states in the rolling and transverse direc tions, 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.