Journal
ACTA MATERIALIA
Volume 52, Issue 19, Pages 5551-5561Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2004.08.014
Keywords
atomic force microscopy; transmission electron microscopy; ferritic steel; fatigue; persistent slip band
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Atomic force microscopy and high resolution scanning electron microscopy were applied to the study of surface relief evolution at emerging persistent slip bands (PSBs) in individual grains of ferritic X10CrAl24 stainless steel cycled with constant plastic strain amplitude. Only the combination of both methods can reveal the true shape and fine details of extrusions and intrusions. Quantitative data on the changes of the surface topography of persistent slip markings and on the kinetics of extrusion growth during the fatigue life were obtained. Transmission electron microscopy of surface foils revealed PSBs with the typical, well-known ladder structure. Experimental data on cyclic slip localization in PSBs are compared with those in fee metals and discussed in terms of vacancy models of surface relief evolution and fatigue crack initiation. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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