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Deformation mechanisms of metastable stainless steels accessed locally by monotonic and cyclic nanoindentation

Abstract : Metastable austenitic stainless steels feature an abundance of different deformation mechanisms, which contribute to the distinguished mechanical properties of these alloys. However, these properties are known to depend on the local microstructure and also are highly anisotropic. Furthermore, deformation is expected to be different for the bulk and the surface of a sample. In this sense, a discrete study is not trivial. The present work aims at investigation of the main deformation mechanisms and their gradual evolution, by employing controlled deformation of individual austenite grains via monotonic and cyclic nanoindentation. The corresponding loading–unloading curves have given extensive information about underlying mechanical properties, which could be related to an exhaustive reconstruction of the deformation substructure, both in surface and bulk, by different small scale characterization techniques. Amongst others, features such as time-dependent deformation, reversible phase transformation under load, crystalline anisotropy and grain size influences, besides plasticity transmission and fatigue behavior have been found and analyzed
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Submitted on : Sunday, July 22, 2018 - 1:01:19 AM
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  • HAL Id : tel-01752370, version 1


Ina Sapezanskaia. Deformation mechanisms of metastable stainless steels accessed locally by monotonic and cyclic nanoindentation. Mechanics of materials [physics.class-ph]. Université de Lorraine, 2016. English. ⟨NNT : 2016LORR0128⟩. ⟨tel-01752370⟩



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