Journal ArticleDOI
The effect of grain size and grain orientation on deformation twinning in a Fe-22 wt.% Mn-0.6 wt.% C TWIP steel
TLDR
In this article, the effect of grain size and grain orientation on deformation twinning in a Fe-22-wt.% Mn-0.6-c TWIP steel was investigated.Abstract:
We investigate the effect of grain size and grain orientation on deformation twinning in a Fe–22 wt.% Mn–0.6 wt.% C TWIP steel using microstructure observations by electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). Samples with average grain sizes of 3 μm and 50 μm were deformed in tension at room temperature to different strains. The onset of twinning concurs in both materials with yielding which leads us to propose a Hall–Petch-type relation for the twinning stress using the same Hall–Petch constant for twinning as that for glide. The influence of grain orientation on the twinning stress is more complicated. At low strain, a strong influence of grain orientation on deformation twinning is observed which fully complies with Schmid's law under the assumption that slip and twinning have equal critical resolved shear stresses. Deformation twinning occurs in grains oriented close to 〈1 1 1〉//tensile axis directions where the twinning stress is larger than the slip stress. At high strains (0.3 logarithmic strain), a strong deviation from Schmid's law is observed. Deformation twins are now also observed in grains unfavourably oriented for twinning according to Schmid's law. We explain this deviation in terms of local grain-scale stress variations. The local stress state controlling deformation twinning is modified by local stress concentrations at grain boundaries originating, for instance, from incoming bundles of deformation twins in neighboring grains.read more
Citations
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Journal ArticleDOI
High manganese austenitic twinning induced plasticity steels: A review of the microstructure properties relationships
TL;DR: A review of the relations between microstructure and mechanical properties is presented in this article focusing on plasticity mechanisms, strain-hardening, yield stress, texture, fracture and fatigue.
Journal ArticleDOI
Twinning-induced plasticity (TWIP) steels
TL;DR: In this paper, the authors present a review of recent developments in the field of deformation behavior of high manganese face-centered cubic γ-Fe alloys, referred to as twinning-induced plasticity, or TWIP, steels.
Journal ArticleDOI
Dislocation and twin substructure evolution during strain hardening of an Fe-22 wt.% Mn-0.6 wt.% C TWIP steel observed by electron channeling contrast imaging
TL;DR: In this article, the authors studied the kinetics of the substructure evolution and its correspondence to the strain hardening evolution of an Fe-22 wt.% Mn-0.6 wt% C TWIP steel during tensile deformation by means of electron channeling contrast imaging (ECCI) combined with electron backscatter diffraction (EBSD).
Journal ArticleDOI
Design of a twinning-induced plasticity high entropy alloy
Yun Deng,Yun Deng,Cemal Cem Tasan,Konda Gokuldoss Pradeep,Konda Gokuldoss Pradeep,Hauke Springer,Aleksander Kostka,Dierk Raabe +7 more
TL;DR: In this article, a liquid metallurgy synthesized, non-equiatomic Fe 40 Mn 40 Co 10 Cr 10 high entropy alloy is designed to undergo mechanically-induced twinning upon deformation at room temperature.
Journal ArticleDOI
A novel, single phase, non-equiatomic FeMnNiCoCr high-entropy alloy with exceptional phase stability and tensile ductility
TL;DR: In this article, a nonequiatomic FeMnNiCoCr alloy is introduced and characterized at multiple scales employing various characterization techniques (e.g., atom probe tomography, electron channeling contrast imaging, electron backscatter diffraction, etc.) to elucidate the role of configurational entropy and intrinsic tensile ductility of high-entropy alloys.
References
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Journal ArticleDOI
High strength Fe–Mn–(Al, Si) TRIP/TWIP steels development — properties — application
TL;DR: In this paper, the formation of twins, α- and e- martensite during plastic deformation was analyzed by optical microscopy, X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscope (TEM).
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The onset of twinning in metals: a constitutive description
TL;DR: In this article, a constitutive expression for the twinning stress in BCC metals is developed using dislocation emission from a source and the formation of pile-ups, as rate-controlling mechanism.
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Supra-Ductile and High-Strength Manganese-TRIP/TWIP Steels for High Energy Absorption Purposes
TL;DR: In this paper, the microstructural properties of advanced high strength and supra-ductile TRIP and TWIP steels with high-manganese concentrations (15 to 25 mass%) and additions of aluminum and silicon (2 to 4mass%) were investigated as a function of temperature (−196 to 400°C) and strain rate (10−4≤e≤103 s−1).
Journal ArticleDOI
Effect of grain and twin boundaries on the hardening mechanisms of twinning-induced plasticity steels
TL;DR: In this paper, a new physical-based model describing the isotropic and kinematic hardening is presented and validated in relation to the grain size and the twin spacing during straining.
Journal ArticleDOI
Cold rolling behaviour of an austenitic Fe–30Mn–3Al–3Si TWIP-steel: the importance of deformation twinning
TL;DR: In this paper, the evolution of microstructure and texture of a TWIP-steel during cold rolling was studied, and the presence of deformation twinning at low strains ( e 〈1 1 2〉 is dominant at every strain level.