Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

Zhao, Yuchen; Joncour, Léa Le; Baczmański, Andrzej; Gadalińska, Elżbieta; Wroński, Sebastian; Panicaud, Benoît; François, Manuel; Braham, C.; Buslaps, T.

doi:10.1016/j.matdes.2016.10.014

Cited by 18 publications

(5 citation statements)

References 42 publications

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“…The dislocation contrast factors for screw and edge type dislocations are considered as temperature dependent and have been calculated using the values in the literature for ferrite [25][26][27]. For austenite, they have been considered constant due to the lack of available data [28]. Many models propose a description of isotropic elastic constants but the data considering the elastic anisotropy of the lattice are rare.…”

Section: Methodsmentioning

confidence: 99%

Dislocation densities in a low-carbon steel during martensite transformation determined by in situ high energy X-Ray diffraction

Macchi

Gaudez

Géandier

et al. 2021

Materials Science and Engineering: A

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The evolution of the dislocation densities in martensite and in austenite during the quench of a low-carbon (0.215 wt.% C) steel is investigated in situ by the mean of a High Energy X-Ray Diffraction experiment on a synchrotron beamline. The line configuration offers an excellent time resolution well adapted to the studied martensitic transformation kinetics. The mean density of dislocations in martensite increases as the transformation proceeds confirming that dislocations are not homogeneously distributed between the laths in agreement with some recent post-mortem observations. The resulting spatial distribution of dislocations and the associated strain-hardening support the views assuming that lath martensite is a heterogeneous microstructure and behaves as a "multiphase" aggregate. In austenite, the increase in dislocation densities is even more significant meaning that austenite in martensite is also a hard phase, contradicting some recent theories attributing to films of retained austenite a major role in the plasticity of martensite.

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Section: Methodsmentioning

confidence: 99%

Dislocation densities in a low-carbon steel during martensite transformation determined by in situ high energy X-Ray diffraction

Macchi

Gaudez

Géandier

et al. 2021

Materials Science and Engineering: A

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“…The TRIP effect is achieved by deformation-induced martensitic transformation (DIMT), providing additional work hardening that postpones plastic instability and necking. The TRIP effect is successfully utilized in numerous steels, not only in metastable austenitic stainless steels, but also in TRIP carbon steels [2], quenching & partitioning steels [3], maraging steels [4] and other high strength steels [5][6][7]. The new TRIP-assisted duplex stainless steels, hereinafter referred to as TDSS, can have total elongations over ~60% and ultimate tensile strengths up to ~1 GPa [8].…”

Section: Introductionmentioning

confidence: 99%

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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“…In addition, the β value must be small enough to cover only crystallites oriented relatively to the considered direction. For these reasons and based on [14,19] studies, the intensities of the diffraction rings were integrated, as a compromise, within "cake shape" sectors defined by β ± 10°. Finally the arithmetic mean values of the dspacings 〈% ℎ .…”

Section: Synchrotron X-ray Measurementsmentioning

confidence: 99%

“…However, in situ synchrotron experiment specimens, denoted as S-samples, have been machined along the Transverse Direction (TD) of the rolled plate, as shown on Fig.1.b. The sample thickness was small enough (2 mm) to enable transmission measurements[19]. The metallographic characterization has revealed that the…”

mentioning

confidence: 99%

Lattice strain development in an alpha titanium alloy studied using synchrotron and neutron diffraction

Agbovi

Girault

Fajoui

et al. 2021

Materials Science and Engineering: A

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Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

Cited by 18 publications

References 42 publications

Dislocation densities in a low-carbon steel during martensite transformation determined by in situ high energy X-Ray diffraction

Dislocation densities in a low-carbon steel during martensite transformation determined by in situ high energy X-Ray diffraction

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

Lattice strain development in an alpha titanium alloy studied using synchrotron and neutron diffraction

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