Development of pseudoelasticity in Fe–10Ni–7Mn (wt%) high strength martensitic steel by intercritical heat treatment and subsequent ageing

Koohdar, Hamidreza; Nili‐Ahmadabadi, Mahmoud; Parsa, Mohammad Habibi; Jafarian, H.R.

doi:10.1016/j.msea.2014.10.049

Cited by 17 publications

(4 citation statements)

References 38 publications

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“…. This phenomenon is mostly attributed to the reversible transformation (

γ \Leftrightarrow ϵ

) under load, which can be triggered strain‐induced plasticity at room temperature, particularly in alloys with low stacking fault energy, SFE . On the other hand, the deformation‐induced ϵ ‐martensite formation in alloys with a low Ni content (see Table ) has been reported to be rather unstable…”

Section: Resultsmentioning

confidence: 99%

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

Rovira

Sapezanskaia

Fargas

et al. 2018

steel research int.

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Metastable austenitic stainless steels are an interesting group of materials, which exhibit the Transformation Induced Plasticity effect. In this regard, phase transformation from austenite to martensite enhances the work hardening of the metastable austenitic stainless steels affecting the deformation dynamics and mechanical properties including fatigue properties. Within this context, the reversible load-induced phase transformation from γ to e-martensite is investigated at the local scale under cyclic indentation. This reversible phase transformation is manifested itself by a combination of hysteresis loops, elbow formation, and reversible pop-ins in the loading curve. The initial cyclic achieved through the nanoindentation technique allows to identify three different deformation regimes for the <111> austenitic grains. Firstly, a softening effect takes place due to the dislocation activation; subsequently the phase transformation induces a hardening effect and finally, the load deformation curve reaches a plateau where no more plastic deformation is observed. Experimental Section

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“…. This phenomenon is mostly attributed to the reversible transformation (

γ \Leftrightarrow ϵ

Section: Resultsmentioning

confidence: 99%

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

Rovira

Sapezanskaia

Fargas

et al. 2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…Microstructure and pseudoelasticity evolution during post-deformation annealing Generally, the following three microstructural phenomena are likely to occur due to the annealing of cold-worked austenitic steels [49,50]:…”

Section: 2mentioning

confidence: 99%

Enhanced Pseudoelasticity of an Femnsi-Based Shape Memory Alloy by Applying Microstructural Engineering Through Recrystallization and Precipitation

Khodaverdi

Mohri²,

Ghafoori³

et al. 2022

SSRN Journal

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“…It has been described that for Fe-Mn-Ni steels the presence of precipitates increases the shape memory characteristics 265 and, additionally, that only when austenite contains precipitates is susceptible to reversible γ↔ε transformation under load 257 . The authors explained this fact because dislocation slip in obstacle free austenite is more favorable than ε-martensite formation.…”

Section: Validation Of Shape Memory Propertiesmentioning

confidence: 99%

“…under load is the most widely reported reason for occurrence of pseudoelasticity in iron-based shape memory alloys [250][251][252][253] , where it is regularly observed during cyclic loading 254,255 . This behavior can be triggered strain-induced at room temperature, particularly in alloys with low SFE 254,256,257 .…”

mentioning

confidence: 99%

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

Sapezanskaia

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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. Los aceros inoxidables austeníticos metaestables pueden experimentar una amplia gama de mecanismos de deformación diferentes, los cuales contribuyen a sus extraordinarias propiedades mecánicas. Sin embargo, estas propiedades dependen de la microestructura y son altamente anisotrópicas. Además, la deformación es diferente en la superficie y en el interior de una muestra. Por lo tanto, un estudio detallado no resulta trivial. El objetivo de este trabajo es el estudio de los principales mecanismos de deformación, así como de su desarrollo gradual. Para ello se han realizado ensayos de nanoindentación, tanto monotónica como cíclica, los cuales han permitido la deformación controlada de granos austeníticos preseleccionados. Las curvas de carga y descarga de los ensayos de nanoindentación han proporcionado amplia información sobre el comportamiento mecánico del acero, la cual se ha podido correlacionar con la reconstrucción detallada de las subestructuras de deformación, tanto a nivel superficial como en el interior, la cual se ha llevado a cabo mediante técnicas de caracterización a escala microscópica. Entre otros, se encontraron y estudiaron fenómenos como las transformaciones de fase reversibles bajo carga, la influencia tanto de la anisotropía cristalina como del tamaño de grano, mecanismos dependientes del tiempo, junto con la transmisión de plasticidad y la respuesta a fatiga. Les aciers inoxydables austénitiques métastables sont le siège de différents mécanismes de déformation qui sont à l'origine des propriétés mécaniques qui distinguent ce type d’alliages. Cependant, ces dernières, dépendant de la microstructure locale, sont fortement anisotropes. Par ailleurs, la déformation d'un échantillon massif serait différente de celle obtenue en surface. De ce fait, une étude détaillée trouve tout son intérêt. Le présent travail vise donc à identifier les principaux mécanismes de déformation et de leur évolution progressive, en se basant sur une déformation contrôlée de grains austénitiques individuels par des tests mécaniques de nanoindentation monotoniques et cycliques. Les courbes correspondantes au chargement-déchargement révèlent des informations détaillées sur les propriétés mécaniques sous-jacentes qui pourraient être liées à une étude complète de la structure de déformation en surface et en volume par différentes techniques de caractérisation à une échelle très fine. La déformation en fonction du temps, les phénomènes de transformation de phase réversible sous charge, l'anisotropie cristalline, l'influences de la taille des grains, la transmission de la plasticité et la tenue en fatigue ont été mis en évidence et étudiés.

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Development of pseudoelasticity in Fe–10Ni–7Mn (wt%) high strength martensitic steel by intercritical heat treatment and subsequent ageing

Cited by 17 publications

References 38 publications

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

Enhanced Pseudoelasticity of an Femnsi-Based Shape Memory Alloy by Applying Microstructural Engineering Through Recrystallization and Precipitation

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

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