Deformation mechanisms in austenitic TRIP/TWIP steels at room and elevated temperature investigated by acoustic emission and scanning electron microscopy

Linderov, Mikhail; Segel, C.; Weidner, Anja; Biermann, Horst; Vinogradov, Alexei

doi:10.1016/j.msea.2013.12.094

Cited by 63 publications

(39 citation statements)

References 22 publications

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“…Up to date, numerous investigations have been performed on different class of austenitic steels in metastable state in order to achieve a deeper understanding and knowledge of the corresponding microstructural evolutions and their influences on the related mechanical properties [10,11]. However, appreciating all the previous attempts, the resultant peculiar strain hardening mechanisms are still not fully understood, and the extent and the sequence of various…”

Section: Introductionmentioning

confidence: 99%

The sequential twinning-transformation induced plasticity effects in a thermomechanically processed high Mn austenitic steel

Sabzi

Zarei-Hanzaki

Abedi

et al. 2018

Materials Science and Engineering: A

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Different initial microstructures with various bimodal grain size distributions (BGSD) were produced in a high Mn austenitic steel through applying a predetermined set of thermomechanical processing cycles. The corresponding room temperature mechanical properties and the related strain hardening behaviors were assessed using tensile testing method. The results indicated that in the microstructure with high grain size bimodality, the length and amplitude of rapid hardening region was well higher than the others. This was attributed to its higher capability to α'-martensite formation. In addition, the threshold strain to initiate martensitic transformation was shifted to the lower one in the microstructure with higher bimodal grain size distribution. The latter was related to the lower arisen back stresses in the interior regions of the coarser grains. Furthermore, different transformation paths were identified as the BGSD changed. The austenite could directly transform to α'-martensite (γ α') in the microstructure with lower BGSD; in this case the α'-martensite mainly appeared at the intersections of deformation twins. In contrast, in microstructures with higher BGSD, the nucleation occurred at the intersections of ε-martensite platelets. The co-existence of these transformation paths provided an extended transformation induced plasticity effect ending to a higher elongation to fracture in the course of deformation. In order to summarize the contribution of various strain hardening mechanisms, a deformation map was also constructed. Accordingly, the enhanced ductility/strength properties were attributed to the sequential operation of extended transformation induced plasticity and twinning induced plasticity effects.

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Section: Introductionmentioning

confidence: 99%

The sequential twinning-transformation induced plasticity effects in a thermomechanically processed high Mn austenitic steel

Sabzi

Zarei-Hanzaki

Abedi

et al. 2018

Materials Science and Engineering: A

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“…[9] The applicability of this approach was discussed in detail by Geissler et al [10] If the influence of temperature is discussed (Figure 1(c)), the main influence is attributed to DG cfie (Figure 1(b)), whereas the other contributions show only a negligible temperature dependence. [6] With a low SFE, special deformation mechanisms in the austenite are activated that involves SF formation, [11][12][13][14][15][16][17] namely single-slip e-martensite formation and twinning. The dissociation width (d s ) of partial dislocations depends mainly on the shear stress component on the glide plane s zx and the SFE (c SF ) according to Byun.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanisms in Austenitic TRIP/TWIP Steel as a Function of Temperature

Martin

Wolf

Martin

et al. 2014

Metall Mater Trans A

232

106

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A high-alloy austenitic CrMnNi steel was deformed at temperatures between 213 K and 473 K (À60°C and 200°C) and the resulting microstructures were investigated. At low temperatures, the deformation was mainly accompanied by the direct martensitic transformation of c-austenite to a¢-martensite (fcc fi bcc), whereas at ambient temperatures, the transformation via emartensite (fcc fi hcp fi bcc) was observed in deformation bands. Deformation twinning of the austenite became the dominant deformation mechanism at 373 K (100°C), whereas the conventional dislocation glide represented the prevailing deformation mode at 473 K (200°C). The change of the deformation mechanisms was attributed to the temperature dependence of both the driving force of the martensitic c fi a¢ transformation and the stacking fault energy of the austenite. The continuous transition between the e-martensite formation and the twinning could be explained by different stacking fault arrangements on every second and on each successive {111} austenite lattice plane, respectively, when the stacking fault energy increased. A continuous transition between the transformation-induced plasticity effect and the twinninginduced plasticity effect was observed with increasing deformation temperature. Whereas the formation of a¢-martensite was mainly responsible for increased work hardening, the stacking fault configurations forming e-martensite and twins induced additional elongation during tensile testing.

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“…A novel statistical method of AE signal categorization and recognition developed in [25] has been proven effective for real-time analysis of elementary deformation mechanisms in advanced materials including Mg alloys. The method was successfully tested and applied for discrimination between contributing deformation mechanisms such as dislocation slip, twinning and martensitic transformations from the AE signal at various stages of deformation in several materials [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Mechanical Twinning during Cyclic Deformation of Mg-Zn-Ca Alloys

Vinogradov

Васильев

Linderov

et al. 2016

Metals

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Abstract:The present study clarifies the complex interplay between mechanical twinning and dislocation slip during low-cycle fatigue testing of Mg-Zn-Ca alloys. Temporal details of these mechanisms are studied non-destructively by in situ monitoring of the acoustic emission (AE) response powered by a robust signal categorization. Through the analysis of AE time series, the kinetics of deformation twinning per cycle and the overall accumulation of twinning during cyclic loading is described and its effect on fatigue life is highlighted.

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Deformation mechanisms in austenitic TRIP/TWIP steels at room and elevated temperature investigated by acoustic emission and scanning electron microscopy

Cited by 63 publications

References 22 publications

The sequential twinning-transformation induced plasticity effects in a thermomechanically processed high Mn austenitic steel

The sequential twinning-transformation induced plasticity effects in a thermomechanically processed high Mn austenitic steel

Deformation Mechanisms in Austenitic TRIP/TWIP Steel as a Function of Temperature

Evolution of Mechanical Twinning during Cyclic Deformation of Mg-Zn-Ca Alloys

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