The difference in thermal and mechanical stabilities of austenite between carbon- and nitrogen-added metastable austenitic stainless steels

Masumura, Takuro; Nakada, Nobuo; Tsuchiyama, Toshihiro; Takaki, Setsuo; Koyano, Tomohiro; Adachi, K.

doi:10.1016/j.actamat.2014.10.041

Cited by 107 publications

(45 citation statements)

References 17 publications

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“…The thin-foil specimens were prepared using focused ion beam and a dualbeam instrument FEI Nova 600. The SFEs can be estimated using thermodynamic modelling by calculating the molar Gibbs free energy difference between γ and ε (∆ → ) and adding the contributions of the interfacial energy of the γ/ε interface ′ [18,44,45] and the strain energy ( ):…”

Section: Data Analysis For Strain/stress Analysismentioning

confidence: 99%

“…This is the steel with the lowest α' fraction but still about 10%. Hence, it indicates that α' can form at intersections of shear bands, twin boundaries and dislocation walls [18,55] without ε. This could be due to that α' can form at less potent sites with the additional help from piled-up dislocations [56].…”

Section: Deformation Behaviour Of Individual Constituentsmentioning

confidence: 99%

“…hcp-and bcc-martensite (hereinafter referred to as ε and α', respectively), during deformation. Many previous studies on DIMT have been devoted to the investigation of TRIP carbon steels [2,4,[14][15][16] and metastable austenitic stainless steels [17][18][19][20], but studies of DIMT in TDSS are rarely presented, apart from some recent reports [8,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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Two transformation-induced plasticity (TRIP) assisted duplex stainless steels, with three different stabilities of the austenite phase, were investigated by synchrotron X-ray diffraction characterization during in situ uniaxial tensile loading. The micromechanics and the deformation-induced martensitic transformation (DIMT) in the bulk of the steels were investigated in situ. Furthermore, scanning electron microscopy supplemented the in situ analysis by providing information about the microstructure of annealed and deformed specimens. The dependence of deformation structure on austenite stability is similar to that of single-phase austenitic steels where shear bands and bcc-martensite (α') are generally observed, and blocky α' is only frequent when the austenite stability is low. These microstructural features, i.e. defect structure and deformation-induced martensite, are correlated with the micro-and macro-mechanics of the steels with elastoplastic load transfer from the weaker phases to the stronger α', in particular this occurs close to the point of maximum rate of α' formation. A clear strain-hardening effect from α' is seen in the most unstable austenite leading to a pronounced TRIP effect.

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Section: Data Analysis For Strain/stress Analysismentioning

confidence: 99%

Section: Deformation Behaviour Of Individual Constituentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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“…Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk Xray study of the grain-averaged and single-grain behavior [6]. The reason for these differences between alloys should be related to the three fundamental factors and presumably to the difference in the formation of martensite, e.g.…”

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confidence: 99%

Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk X-ray study of the grain-averaged and single-grain behavior

et al. 2017

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“…It is generally known that deformation twins easily form in austenite, with its lower stacking-fault energy, 29) indicating that the reason why deformation twinning is suppressed in high-N steel is that N increases the stacking-fault energy of austenite. 2,3,30) In order to confirm the difference of the dislocation arrangement, the microstructure in both steels given 2% true strain was examined by TEM, as shown in Fig. 4.…”

Section: Methodsmentioning

confidence: 99%

Work-Hardening Mechanism in High-Nitrogen Austenitic Stainless Steel

et al. 2020

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The remarkably high work-hardening rate in high-nitrogen austenitic stainless steels is generally believed to be due to the promotion of dislocation accumulation by nitrogen addition. However, analysis of dislocation accumulation behavior by the modified Williamson-Hall/ Warren-Averbach method reveals that no difference to the increment of the dislocation density during deformation exists between austenitic steels with and without nitrogen. Since cross slipping is markedly suppressed in high-nitrogen steels, the moving dislocations are back-stressed by the planar dislocation arrays. This induces the deformation resistance and the high work-hardening rate.

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The difference in thermal and mechanical stabilities of austenite between carbon- and nitrogen-added metastable austenitic stainless steels

Cited by 107 publications

References 17 publications

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk X-ray study of the grain-averaged and single-grain behavior

Work-Hardening Mechanism in High-Nitrogen Austenitic Stainless Steel

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