Effect of temperature on the stacking fault energy and deformation behaviour in 316L austenitic stainless steel

Molnár, Dávid; Sun, Xun; Lu, Song; Li, Wei; Engberg, Göran; Vitos, Levente

doi:10.1016/j.msea.2019.05.079

Cited by 137 publications

(37 citation statements)

References 52 publications

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“…mJ/m 2 ). According to this technique, the steel subject of study behaves in a TRIPlike way at room temperature so, as SFE increases with temperature in austenite [93], it is possible for TRIP transformations to occur at higher temperatures, although it is also possible that the mechanism changes to TWIP or even dislocation glide, depending on the SFE value.…”

Section: Resultsmentioning

confidence: 99%

Stress or strain induced martensitic and bainitic transformations during ausforming processes

2020

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The so-called ausforming treatment consists in plastically deforming a fully austenitized steel below the recrystallization stop temperature, prior to either a martensitic or a bainitic transformation. Although this procedure is envisioned as a way to improve the mechanical response of the attained microstructure, it is not without its drawbacks, as the possibility of phase transformations occurring during the deformation step. When such step is applied at relatively higher temperatures than those of the aimed microstructure, the presence of those softer phases could be rather detrimental for the final microstructure. The current study aims to further study those phase transformations to analyze whether they are induced via either stress or strain and to identify the temperature ranges in which they tend to occur, so that they can be avoided or used to improve the final microstructure properties in the future. A final evaluation on the impact of these induced transformations on the final microstructure when deformation is followed by either cooling or an isothermal treatment is also performed.

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Section: Resultsmentioning

confidence: 99%

Stress or strain induced martensitic and bainitic transformations during ausforming processes

2020

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“…For instance, the highest elongation during tensile testing of the AISI 201 stainless steel [133] was achieved at around 50 °C, in which the α'-martensite fraction was ~ 18 vol%, but the contribution of mechanical twinning, i.e. the twinninginduced plasticity (TWIP) effect [191,192], was obvious.…”

Section: Trip Effectmentioning

confidence: 99%

Deformation-induced martensite in austenitic stainless steels: A review

Sohrabi

Naghizadeh

Mirzadeh

2020

Archiv.Civ.Mech.Eng

168

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Recent progress in the understanding of the deformation-induced martensitic transformation, the transformation-induced plasticity (TRIP) effect, and the reversion annealing in the metastable austenitic stainless steels are reviewed in the present work. For this purpose, the introduced methods for the measurement of martensite content are summarized. Moreover, the austenite stability as the key factor for controlling the austenite to martensite transformation is critically discussed. This is realized by analyzing the effects of chemical composition, initial grain size, applied strain, deformation temperature, strain rate, and deformation mode (stress state). For instance, the effect of initial grain size is found to be complicated, especially in the ultrafine grained (UFG) regime. Furthermore, it seems that there is a critical grain size for changing the trend of α′-martensite formation. Decreasing the deformation temperature motivates the formation of α′-martensite, but there is a critical temperature for achieving the maximum tensile ductility. Afterwards, the modeling techniques for the transformation kinetics and the contribution of deformation-induced martensitic transformation to the strengthening of material and also strength-ductility trade-off are critically surveyed. The processing of UFG microstructure during reversion annealing, the effects of the recrystallization of the retained austenite, the martensitic shear and diffusional reversion mechanisms, and the annealing-induced martensitic transformation are also summarized. Accordingly, this overview presents the opportunities that the strain-induced martensitic transformation can offer for controlling the microstructure and mechanical properties of metastable austenitic stainless steels.

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“…The deformation mechanisms of γ mainly depend on the structure stacking fault energy (SFE) [58], which is a function of the chemical composition and temperature [59][60][61]. These mechanisms can be of different types: (a) the displacive SIT/DIT are promoted if SFE <18 mJ m −2 , (b) twinning occurs if SFE is in the range 18-45 mJ m −2 and (c) dislocation glide happens if SFE >45 mJ m −2 [62].…”

Section: Stacking Fault Energymentioning

confidence: 99%

Future Trends on Displacive Stress and Strain Induced Transformations in Steels

Eres-Castellanos

García‐Mateo

Caballero

2021

Metals

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Displacive stress and strain induced transformations are those transformations that occur when the formation of martensite or bainitic ferrite is promoted by the application of stress or strain. These transformations have been shown to be one of the mechanisms by which the mechanical properties of a microstructure can be improved, as they lead to a better ductility and strength by the transformation induced plasticity effect. This review aims to summarize the fundamental knowledge about them, both in fully austenitic or in multiphase structures, pointing out the issues that—according to the authors’ opinion—need further research. Knowing the mechanisms that govern the stress and strain induced transformation could enable to optimize the thermomechanical treatments and improve the final microstructure properties.

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Effect of temperature on the stacking fault energy and deformation behaviour in 316L austenitic stainless steel

Cited by 137 publications

References 52 publications

Stress or strain induced martensitic and bainitic transformations during ausforming processes

Stress or strain induced martensitic and bainitic transformations during ausforming processes

Deformation-induced martensite in austenitic stainless steels: A review

Future Trends on Displacive Stress and Strain Induced Transformations in Steels

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