Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 400, Issue -, Pages 241-244Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.02.092
Keywords
martensitic steel; cyclic softening; microstructure evolution; low-angle boundary; dislocation annihilation; Hall-Petch law
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Martensitic steels are known for their softening during cyclic tests carried out at high temperature. The softening has been at least partially explained by lath and sub-grain boundary elimination. This article is dedicated to an attempt at modelling both phenomena. Thanks to mechanical tests it is shown that the softening is mainly due to a decrease of the backstress. Transmission electron microscopy allows us to propose a mechanism of low-angle boundary elimination. Annihilation between dislocations of low-angle boundaries and incident mobile dislocations is modelled. The macroscopic backstress is finally computed using a Hall-Petch law and the Taylor model. (c) 2005 Elsevier B.V. All rights reserved.
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