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Deformation mechanism induced under high cycle fatigue test in a metaestable austenitic stainless steel
Roa Rovira, Joan Josep; Fargas Ribas, Gemma; Jiménez Piqué, Emilio; Mateo García, Antonio Manuel
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural i Fiabilitat dels Materials
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).
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Stainless steel--Fatigue
Fatigue Metastable austenite Deformation mechanisms Phase transformation
Metalls -- Fatiga
Acer inoxidable
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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