High-Strength Single Crystals of Austenitic Stainless Steels with Nitrogen Content: Mechanisms of Deformation and Fracture

Chumlyakov, Yu. I.; Киреева, И. В.; Şehitoğlu, Hüseyin; Litvinova, Eugenia; Zaharova, E.G.; Luzginova, N.V.

doi:10.4028/www.scientific.net/msf.318-320.395

Cited by 18 publications

(14 citation statements)

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“…The steel demonstrates striking temperature dependence of the yield strength (Figure 4a) peculiar for fcc alloys with high volume content of interstitials [8,14,20,44,45]. The σ 0.2 -values in Figure 4a show almost linear growth with the decrease in test temperature.…”

Section: Discussionmentioning

confidence: 95%

“…For nitrogen-and carbon-bearing austenitic steels, interstitial hardening is well-known and the most obvious temperature-dependent factor in the thermally-activated temperature range-σ SS ~σG + U 0 /V−AT/V (U 0 -activation energy at zero stress, V-activation volume, A-constant which depends on the density of sites at which the activation occurs, Burgers vector of dislocations and the areas they swept during overcoming of the obstacles, strain rate and some other physical parameters) [8,[12][13][14]20,45]. In this proportion, the athermal stress component σ G increases with growth of interstitial concentration and changes with the temperature proportionally to G(T)-dependence (G is a shear modulus).…”

Section: Discussionmentioning

confidence: 99%

“…In austenitic nitrogen-bearing steels these effects are closely related to nucleation and growth of the brittle cracks along {111}-type crystallographic planes (or close to them). This peculiarity arises due to intersection of dislocations (or twins) with boundaries of mechanical twins in conjugative systems [16,20] or γ-α' phase transformation [21,22] in steels with low stacking fault energy (SFE). In steels with high SFE-values, it occurs by slipping-off of active slip planes assisted by planar dislocation slip [17].…”

Section: Introductionmentioning

confidence: 99%

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On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Астафурова

Астафуров

Maier

et al. 2020

Metals

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The microstructure, deformation mechanisms, tensile properties and fracture micromechanisms of ultrahigh-interstitial austenitic Fe-22Cr-26Mn-1.3V-0.7C-1.2N (mass.%) steel were investigated in wide temperature interval. After conventional homogenization and solid-solution treatment, the steel possesses complex hardening which includes grain boundary, solid-solution and dispersion strengthening. In the temperature interval of −60 to +60 °C, steel demonstrates striking temperature dependence of a yield strength which could be enhanced by the increase in solid-solution treatment temperature. The variation in test temperature does not change the dominating deformation mechanism of the steel, dislocation slip and insufficiently influences tensile elongation and fracture micromechanisms. The insignificant increase in the fraction of brittle cleavage-like component on the fracture surfaces of the specimens in low-temperature deformation regime is promoted by increase in planarity of dislocation arrangement and the gaining activity of mechanical twinning. In high-temperature range (200–300 °C) of deformation, a negative strain-rate dependence, serrations on the stress-strain diagrams and improved strain-hardening associated with a dynamic strain aging phenomenon have been observed.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Астафурова

Астафуров

Maier

et al. 2020

Metals

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“…Thirdly, regarding the mechanical twinning, prior studies revealed that twinning is the primary deformation mechanism at the beginning, and at initial stages of deformation for tensile loading of oriented Had eld steel single crystals [5,10,12,19,20]. There is evidence from an earlier study on Cu single crystals that activation of primary twinning alone could lessen the hardening rate.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Contributions of Mechanical Twinning and Dislocations to the Flow Stress of Hadfield High-Manganese Steel: Quantitative Analysis

Khedr

Min

et al. 2022

J. of Materi Eng and Perform

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The ow stress of high C-Mn austenitic steel is attributed to lattice friction, dynamic strain aging (DSA), mechanical twinning and forest hardening. However, it has not been clari ed yet which mechanism quantitatively contributes most to the work hardening of 12.5Mn-1.1C steel. In this study, austenitic Had eld steel (1.1 wt.% C and 12.5 wt.% Mn) was tensile tested at a strain rate of 10 s − 1 . The lattice friction was estimated by the Hall-Petch relationship. DSA effect was neglected because of the high strain rate of deformation. Twin plates characteristics and dislocation densities were estimated quantitatively at different strain levels (11, 18, 25, 38, and 55%). The deformed twin plates were studied by optical and transmission electron microscopies. Dislocation densities were estimated by analyzing the X-ray diffraction patterns using Rietveld analyses. A linear approach was utilized to model the ow stress during the plastic deformation, and it is found that the linear model is consistent with the experimental results. During the early stages of the plastic deformation, the mechanical twinning was the dominant deformation mechanism, and it was more effective to the ow stress than the forest hardening due to the enhancement of the twin nucleation process. However, with increasing the strain level, the thicknesses of the twinned plates were increased rather than the initiation of new twin plates, resulting in a reduced contribution by the mechanical twinning to the ow stress. On the other hand, increasing the dislocation densities with an increase in the strain level was detected, which resulted in an enhanced contribution by forest hardening to the ow stress more than the mechanical twinning.

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“…[2][3][4][5][6] However, it has been also pointed out that the high nitrogen austenitic steels exhibit ductile-brittle transition behavior as in ferritic steels, and the ductility of the steels is significantly lowered at low temperature. 7,8) Therefore, strengthening due to nitrogen seems to be limited in terms of application for structural use at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fine-grained High Nitrogen Austenitic Steels through Mechanical Alloying Treatment.

et al. 2002

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High-Strength Single Crystals of Austenitic Stainless Steels with Nitrogen Content: Mechanisms of Deformation and Fracture

Cited by 18 publications

References 0 publications

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Strengthening Contributions of Mechanical Twinning and Dislocations to the Flow Stress of Hadfield High-Manganese Steel: Quantitative Analysis

Fabrication of Fine-grained High Nitrogen Austenitic Steels through Mechanical Alloying Treatment.

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