Abstract
AbstractEmploying a focused positron beam with a lateral resolution of approximately 30 μm, we performed two dimensional scanning studies of stainless steels with stress corrosion cracking (SCC). A stainless steel with fatigued crack was also measured for comparison. Results suggest a quite unique failure mechanism for the specimen with SCC. In contrast to normal crack propagation effect associated with vacancies and dislocations, smaller Doppler broadening line shape (S) parameters were observed around the SCC crack tip than those corresponding to the undamaged area. It could be ascribed to some chemical influences, like oxidation, took place at grain boundaries. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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