Deformation mechanism induced under high cycle fatigue test in a metaestable austenitic stainless steel
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Tipus de documentArticle
Data publicació2014
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Abstract
Advanced techniques were used to study the deformation mechanisms induced by fatigue tests in a metastable austenitic stainless steel AISI 301LN. Observations by Atomic Force Microscopy were carried out to study the evolution of a pre-existing martensite platelet at increasing number of cycles. The sub-superficial deformation mechanisms of the austenitic grains were studied considering the cross-section microstructure obtained by Focused Ion Beam and analysed by Scanning Electron Microscopy and Transmission Electron Microscopy. The results revealed no deformation surrounding the pre-existing martensitic platelet during fatigue tests, only the growth on height was observed. Martensite formation was associated with shear bands on austenite, mainly in the {111} plane, and with the activation of the other intersecting austenite {111}<110> slip system. Furthermore, transmission electron microscopy results showed that the nucleation of e-martensite follows a two stages phase transformation (¿fcc¿ehcp¿a'bcc).
CitacióRoa, J.J. [et al.]. Deformation mechanism induced under high cycle fatigue test in a metaestable austenitic stainless steel. "Materials science and engineering A. Structural materials properties microstructure and processing", 2014, vol. 597, p. 232-236.
ISSN0921-5093
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