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Title: Strain Determination In A Friction-welded Sample Using Non-destructive Neutron Diffraction
Author: Priesmeyer, H.G. and Schroder, J.
Source: Shot Peening Theory and Appl., IITT Intl. 1991
Publication year 1991
Document number: 1991041
Number of pages: 7
Abstract:
Neutrons can penetrate thick layers of many engineering materials and therefore provide a useful technique to investigate internal strains reproduced by lattice deformations
in a nondestructive way. The method uses high-resolution neutron diffractometry to determine lattice parameter variations (d-do)/do of the order of 10-3 to 10-4 caused by
internal or external forces. The strain distribution across the weld in an friction-welded sample of a Ni-base superalloy (Waspaloy) has been investigated. To determine
the absolute amount of deformation, the unaffected lattice parameters d-o must be known. The lattice parameters in regions far from both weld and heat affected zone seem to
be a good choice, whereas a high-resolution measurement on Waspaloy powder clearly showed prestress of the powder grains; subsequent annealing caused the precipitation of a
71-phase. The results of the experiments are presented and discussed and conclusions are drawn concerning the design of a neutron spectrometer optimized for strain
measurements at Geesthacht.
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