On the Relationship Between Cyclic Deformation Behavior and Slip Mode in 316LN Stainless Steel with Varying Nitrogen Content

Reddy, G.V. Prasad; Sandhya, R.; Sankaran, Sindhuja; Laha, K.

doi:10.1007/s12666-015-0745-z

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…Many attempts have been made to study the tensile mechanical properties and the microstructure evolution of the HNSs or other nitrogen alloyed austenitic stainless steels for extending their engineering applications [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. These studies suggested that the plastic deformation and fracture behaviour of these steels depended on various kinds of internal and external factors, such as grain size [12,16], twin structure (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…size, shape and amount of twin) [17,[23][24][25], allying elements (e.g. contents of carbon and nitrogen) [13][14][15]21,26,30,31] and testing temperature and strain rate [18][19][20]22,[27][28][29]. However, it is noted from these studies that very limited efforts were made to study the plastic deformation and fracture behaviour of the HNSs at a very wide range of strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Plastic deformation and fracture behaviour of high-nitrogen nickel-free austenitic stainless steel

Sun

et al. 2017

Materials Science and Technology

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The plastic deformation and fracture behaviour of a high-nitrogen nickel-free austenitic stainless steel were examined by performing tensile testing at room temperature and at a wide strain rate range. The tensile testing demonstrated that this steel shows a significant strain rate dependence of the strength and ductility. With increasing strain rate from 10−4 to 1 s−1, the yield strength increases from 673 to 801 MPa and the ultimate tensile strength increases from 958 to 1003 MPa; the uniform elongation decreases from 75 to 44% and the total elongation decreases from 86 to 58%. The analysis of the stress–strain curve by using the Ludwigson equation showed that this steel exhibits a two-stage strain hardening behaviour, the strain hardening exponents at low and high strain regions ([Formula: see text] and [Formula: see text]) and the transition strain ([Formula: see text]) decrease with increasing strain rate. Based on the analysis results of the stress–strain curve, the transmission electron microscopy characterisation of the microstructure and the scanning electron microscopy observation of the deformation and fracture surfaces, the significant strain rate dependence of the strength and ductility of this steel was discussed and connected with the variation in the dislocation activity with strain rate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plastic deformation and fracture behaviour of high-nitrogen nickel-free austenitic stainless steel

Sun

et al. 2017

Materials Science and Technology

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“…[1,3,8] Extensive researches focused on the tensile mechanical properties and the microstructure evolution of the HNSs or other nitrogen alloyed austenitic stainless steels for extending their engineering applications have been reported. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] In these studies, the effects of various kinds of internal and external factors, such as grain size, [12,16] twin structure (e.g., size, shape, and amount of twin), [17,[23][24][25] alloying elements (e.g., contents of carbon and nitrogen) [13][14][15]21,26,30,31] and testing temperature and strain rate [18][19][20]22,[27][28][29] on the plastic deformation behaviors have been investigated extensively. Nevertheless, it is noted from these studies that very limited efforts were made to study the strain rate and cold rolling dependence of tensile strength and ductility of the HNS at a very wide range of strain rate and cold rolling deformation.…”

Section: Introductionmentioning

confidence: 99%

Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel

et al. 2017

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The tensile strength and ductility of a high nitrogen nickel-free austenitic stainless steel with solution and cold rolling treatment were investigated by performing tensile tests at different strain rates and at room temperature. The tensile tests demonstrated that this steel exhibits a significant strain rate and cold rolling dependence of the tensile strength and ductility. With the increase of the strain rate from 10 −4 s −1 to 1 s −1 , the yield strength and ultimate tensile strength increase and the uniform elongation and total elongation decrease. The analysis of the double logarithmic stress-strain curves showed that this steel exhibits a two-stage strain hardening behavior, which can be well examined and analyzed by using the Ludwigson equation. The strain hardening exponents at low and high strain regions (n 2 and n 1 ) and the transition strain (ε L ) decrease with increasing strain rate and the increase of cold rolling RA. Based on the analysis results of the stress-strain curves, the transmission electron microscopy characterization of the microstructure and the scanning electron microscopy observation of the deformation surfaces, the significant strain rate and cold rolling dependence of the strength and ductility of this steel were discussed and connected with the variation in the work hardening and dislocation activity with strain rate and cold rolling.

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“…As already mentioned, N is a powerful γ stabilizer and strengthener and thus, already a slight local variation in can change the transformation mechanism. So, it modifies the dislocation slip and arrangement 123 , as discernible in Figure 21, where dislocation structures of 316L (0.04% N nitrogen) and 316LN (0.14% N) are compared: in the former alloy a disordered dislocation tangle can be observed, while in the later N promotes planar slip, as often observed in literature [124][125][126] .…”

Section: Chemical Compositionmentioning

confidence: 60%

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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On the Relationship Between Cyclic Deformation Behavior and Slip Mode in 316LN Stainless Steel with Varying Nitrogen Content

Cited by 6 publications

References 6 publications

Plastic deformation and fracture behaviour of high-nitrogen nickel-free austenitic stainless steel

Plastic deformation and fracture behaviour of high-nitrogen nickel-free austenitic stainless steel

Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel

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

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