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In-situ diffraction investigations of superelastic NiTi shape memory alloys with neutron and synchrotron x-ray radiation were used to examine the evolution of the phase state of the material as a function of stress and strain, respectively. The results suggest that the transition from austenite to martensite is not complete even at the end of the superelastic plateau, and that significant load transfer to residual austenite takes place.Keywords: Neutron diffraction, x-ray diffraction, evolution of phase state, residual austenite Der Phasenanteil in superelastischen NiTi Formgedächtnislegie-rungen als Funktion von Spannung und Dehnung wurde mittels Neutronen-und Röntgen-Diffraktometrie in-situ untersucht. Die Ergebnisse deuten darauf hin, dass die Umwandlung von Austenit zu Martensit selbst am Ende des superelastischen Plateaus nicht vollständig abgeschlossen ist, und dass ein deutlicher Lasttransfer auf den residuellen Austenit stattfindet.

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High demands are set on gears made from sintered steel regarding wear, fretting, tooth fracture and pitting load capacity. The hardening obtained after the sinter process will affect the microstructure of the sintered steel so that the wear load capacity can increase to higher values. This report shows the influence of different hardenings methods on crossed helical gears fabricated from Fe1.5Cr0.2Mo sintered steel and the changes induced on the microstructure, the surface and the core hardness and the wear load capacity. The research presented in this paper is aimed at finding the most appropriate additional treatment which leads to higher wear load capacity as compared to the wear of sintered steel gears without any additional treatment

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