On the feasibility of partial slip reversal and de-twinning during the cyclic loading of TWIP steel

Saleh, Ahmed A.; Clausen, B.; Brown, Donald W.; Pereloma, Elena V.; Davies, Chris; Tomé, Carlos N.; Gazder, Azdiar A.

doi:10.1016/j.matlet.2016.07.005

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…Saleh et al [11] applied 5 tension-compression cycles with ± 1 % strain on a Fe-24Mn-3Al-2Si-1Ni-0.06C TWIP steel while performing neutron diffraction measurements. The positions of the diffraction peaks provided information on the mean elastic lattice strain over sets of grains sharing the same crystallographic orientation relative to the loading axis.…”

Section: Introductionmentioning

confidence: 99%

Direct monitoring of twinning/detwinning in a TWIP steel under reversed cyclic loading

D'Hondt

Doquet

Couzinié

2021

Materials Science and Engineering: A

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In situ tensile and reversed cyclic tests were run on a TWIP steel in a SEM, with High-Resolution Digital Image Correlation (HR-DIC) measurements of the plastic strain field in a few selected grains prone to twinning, with a spatial resolution between 150 and 250nm, or under an AFM, with measurements of surface steps height at emerging deformation twins. Evidences of detwinning upon load reversal, as well as quantitative data on twinning/detwinning/retwinning were obtained. Detwinning and retwinning, which often were only partial, in spite of a fully reversed loading, did not seem to start at the onset of stress reversal. It required a sufficient variation of the stress, close to the twinning stress (estimated as 400 to 475 MPa) in absolute value, so that a mechanical hysteresis of the local twinned fraction occurred. Primary and secondary twinning along the same plane, inducing axial plastic strains in opposite directions, also allowed some grains to accommodate reversed plastic strain. Under fixed stress amplitude (± 500 MPa), the twin fraction in all monitored grains saturated at values between 0.5 and 3.5%, from the 2 nd cycle, while under fixed plastic strain amplitude (± 0.5%), it increased in a ratchetting way during the whole cyclic hardening stage, reaching 0.5 to 5%. In both cases, however, the plastic strain amplitude accommodated by twinning/detwinning, which reached 0.35 -0.42% in some grains during the 1 st cycle, decreased down to less than 0.05% after 100 to 1000 cycles.

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Section: Introductionmentioning

confidence: 99%

Direct monitoring of twinning/detwinning in a TWIP steel under reversed cyclic loading

D'Hondt

Doquet

Couzinié

2021

Materials Science and Engineering: A

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“…To this end, in a recent elasto-plastic self-consistent (EPSC) modelling study, Saleh et al [27] highlighted the feasibility of de-twinning during the reverse loading of a Fe-24Mn-3Al-2Si-1Ni-0.06C TWIP steel subjected to ±1% cyclic (tension-compression) loading. However, to the best of our knowledge, there is no unambiguous experimental observation of de-twinning in coarse-grained (micron-sized) polycrystalline fcc alloys to-date The present study provides first-time evidence of de-twinning during the reverse loading of a polycrystalline TWIP steel using electron back-scattering diffraction (EBSD).…”

Section: Introductionmentioning

confidence: 99%

On the first direct observation of de-twinning in a twinning-induced plasticity steel

et al. 2018

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Electron back-scattering diffraction was used to track the microstructure evolution of a fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C TWinning Induced Plasticity (TWIP) steel during interrupted reverse (tensioncompression) loading. Direct observation of the same selected area revealed that all deformation twins formed during forward tension loading (0.128 true strain) were removed upon subsequent reverse compression loading (0.031 true strain). Consequently, the present study provides the first unambiguous experimental evidence of de-twinning during the reverse loading of a polycrystalline TWIP steel. The reverse loading behaviour was simulated by a dislocation-based hardening model embedded in the Visco-Plastic Self-Consistent (VPSC) polycrystal framework taking into account the accumulation and annihilation of dislocations and back-stress effects. The model has been extended to account for the processes of twinning and de-twinning, as well as the twin barrier effect under load reversal. A new formulation based on the changes in the dislocation mean free path is proposed to track twin lamellae generation/annihilation throughout deformation along with its associated effect on hardening.

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“…Subsequently, the model can be utilized to simulate the complex strain path changes that take place during industrial forming processes. With regard to TWIP steels, it is highlighted that the reverse glide of the partial dislocations and the associated de-twinning process likely contribute to the pronounced Bauschinger effect (or early yielding during unloading) typically observed upon load reversal [5][6]27].…”

Section: Vpsc Model Predictionsmentioning

confidence: 99%

“…While the monotonic loading behavior of TWIP steel has been the focus of numerous experimental and modeling studies (see for example [3][4] and the references therein), investigations of its cyclic (reverse) loading behavior remain relatively limited. In this regard, an Fe-24Mn-3Al-2Si-1Ni-0.06C (wt.%) TWIP steel subjected to ±1% cyclic (tension-compression) loading was recently investigated using a combination of in-situ neutron diffraction and an elasto-plastic self-consistent model [5][6]. The modeling work in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The modeling work in Ref. [6] suggested that de-twinning could be taking place upon load reversal due to the reversibility of slip along the 〈112〉 direction. To verify the occurrence of de-twinning (i.e., the disappearance of twinned regions as the twins are reoriented back to their parent grains), electron backscattering diffraction (EBSD) was applied in a follow-up study to track microstructure evolution in a region of interest during interrupted reverse (tension-compression) loading of the same TWIP steel [7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Self-Consistent Modeling Study of De-twinning in a Twinning-Induced Plasticity Steel

Saleh

Wen

Pereloma

et al. 2019

JOM

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The effect of compression-tension loading on the microstructure evolution in a fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C twinning-induced plasticity steel has been investigated. Electron backscattering diffraction was used to track a region of interest at true strains of 0 (initial), − 0.09 (after forward compression loading), and 0.04 (after reverse tension loading). All deformation twins detected after forward compression loading were found to de-twin upon subsequent reverse tension loading, likely due to the reverse glide of partial dislocations bounding the twins. The reverse loading behavior, including the twinning and de-twinning processes, was successfully simulated using a recently modified dislocation-based hardening model embedded in the visco-plastic self-consistent polycrystal framework, taking into account the dislocation accumulation/annihilation, as well as the twin barrier and back-stress effects. AbstractThis work investigates the effect of compression-tension loading on the microstructure evolution in a fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C twinning-induced plasticity steel. Electron back-scattering diffraction was used to track a region of interest at true strains of 0 (initial), -0.09 (after forward compression loading) and 0.04 (after reverse tension loading). All deformation twins detected after forward compression loading were found to de-twin upon subsequent reverse tension loading, likely due to the reverse glide of partial dislocations bounding the twins. The reverse loading behavior, including the twinning and de-twinning processes, was successfully simulated using a recently modified dislocation-based hardening model embedded in the visco-plastic self-consistent polycrystal framework, taking into account the dislocation accumulation/annihilation, as well as the twin barrier and back-stress effects.

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On the feasibility of partial slip reversal and de-twinning during the cyclic loading of TWIP steel

Cited by 7 publications

References 16 publications

Direct monitoring of twinning/detwinning in a TWIP steel under reversed cyclic loading

Direct monitoring of twinning/detwinning in a TWIP steel under reversed cyclic loading

On the first direct observation of de-twinning in a twinning-induced plasticity steel

Experimental and Self-Consistent Modeling Study of De-twinning in a Twinning-Induced Plasticity Steel

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