Studies Of Microscopic Strains On Alloy 600
Surfaces Arising From Stress Corrosion Cracking
Author(s)
N. S. McIntyre, T. Simpson J. Qin, N. Sherry, M. Bauer,
J. Ulaganathan, A. G. Carcea, R. C. Newman, M. Kunz
& N. Tamura
Abstract
Microscopic distributions of elastic and plastic strains have been studied in Alloy
600 during accelerated corrosion. Laue diffraction is employed with a submicron
beam of highly coherent polychromatic (white) radiation. The diffraction
patterns are analysed to detect elastic and plastic deformations associated with
the crack initiation and propagation processes. Stressed C ring and unstressed
mill annealed samples of Alloy 600 were corroded under hydrothermal
controlled electrochemical conditions. In the C ring, the filamentous surface
cracks produced had compressive strain fields along each crack. In the mill
annealed sample, changes in strain fields in the same area were measured as
oxidation progressed. Cracking at the metal grain boundaries appeared to be
induced by expansive growth of surface oxides. For the mill annealed sample,
accumulation of elastic strains in the grain boundaries appeared in advance of
crack propagation.
Keywords: strain, stress corrosion cracking, Laue diffraction.
Keywords
Keywords: strain, stress corrosion cracking, Laue diffraction.
Related Book
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