Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 660, Issue -, Pages 47-51Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.02.076
Keywords
Ratcheting strain; Stainless steel; Dislocation character; Dislocation density; Cross-slip
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Ratcheting (i.e., asymmetric stress-controlled fatigue) behavior of a non-conventional stainless steel X12CrMnNiN17-7-5 has been investigated with various combinations of stress amplitudes, mean stresses and number of cycles. XRD profile analysis following modified Williamson-Hall method has been carried out to estimate the dislocation characters and their respective densities in the ratcheted specimens. The precise role of these substructural features on the extent of strain produced during the course of ratcheting has been investigated. The increase in strain owing to ratcheting has been explained by the presence of type of dislocations and their respective densities in the constituent phases of the microstructure. The accumulation of cyclic plastic strain during ratcheting deformation is predominantly progressed by the presence of screw dislocations. The significantly increased fraction of edge dislocations in martensite phase resulted higher work hardening in the ratcheted specimens. Accordingly, the extent of strain produced is relatively less during subsequent ratcheting deformation. (C) 2016 Elsevier B.V. All rights reserved.
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