α′-Martensite formation in deep-drawn Mn-based TWIP steel

Tol, RT; Kim, Jin‐Kyung; Zhao, L.; Sietsma, Jilt; Cooman, Bruno C. De

doi:10.1007/s10853-012-6345-y

Cited by 40 publications

(15 citation statements)

References 20 publications

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“…, however van Tol et al [32] have observed small fractions of α (≤ 1.2%) in a TWIP steel during deep drawing; the stacking fault energy calculated for this steel was 50 mJ m −2 . As the fraction of α is very low for this steel with high-stacking fault energy, it will be assumed that is the main precursor for the γ → α transformation under uniaxial loading [3].…”

Section: α Martensite Formationmentioning

confidence: 72%

Understanding martensite and twin formation in austenitic steels: A model describing TRIP and TWIP effects

Galindo-Nava

Rivera-Dı́az-del-Castillo

2017

Acta Materialia

227

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A unified description for the evolution of-and α-martensite, and twinning in austenitic steels is presented. The formation of micron-scale and twin bands is obtained by considering the evolution of hierarchically arranged nano-sized and twins (embryos). The critical size and applied stress when these structures form is obtained by minimising their free energy of formation. The difference between forming an plate or a twin lies in the number of overlapping stacking faults in their structure. A nucleation rate criterion is proposed in terms of the critical embryo size, resolved shear stress and embryo number density. Based on Olson and Cohen's classical α-martensite transformation model, the nucleation rate of α is considered proportional to that for. These results, combined with dislocation-based approximations, are employed to prescribe the microstructure and flow stress response in steels where transformation-induced-plasticity (TRIP) and/or twinning-inducedplasticity (TWIP) effects operate; these include austenitic stainless and high-Mn steels. Maps showing the operation range of , α and twinning in terms of the stacking fault energy at different strain levels are defined. Effects of chemical composition in the microstructure and mechanical response in stainless steels are also explored. These results allow identifying potential compositional scenarios when the TRIP and/or TWIP effects are promoted in austenitic steels.

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Section: α Martensite Formationmentioning

confidence: 72%

Understanding martensite and twin formation in austenitic steels: A model describing TRIP and TWIP effects

Galindo-Nava

Rivera-Dı́az-del-Castillo

2017

Acta Materialia

227

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“…Depending on the stacking fault energy, α′ martensite forms directly from austenite or via the hexagonal ϵ‐martensite. It is also recently reported that the formation of strain‐induced α′ martensite does not necessarily require the intermediate formation of ϵ‐martensite …”

Section: Resultsmentioning

confidence: 95%

“…It is also recently reported that the formation of strain-induced a 0 martensite does not necessarily require the intermediate formation of e-martensite. [33] Figure 4c reveals austenite grain, embedded with Moiré fringes with an average spacing (<10 nm). The TEM image also indicates that the fringes are stepped or curved due to the presence of high-density dislocations.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cold Rolling on Microstructural Evolution in 2205 Duplex Stainless Steel

Pramanik

Bera

Ghosh

2013

steel research int.

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The influence of cold rolling on the microstructural changes of 2205 duplex stainless steel was investigated. The steel samples revealed the presence of almost equal volume fraction of δ‐ferrite and austenite phase after hot rolling. During cold rolling, the above phase constituents became flattened, fragmented as well as transformed into acicular microstructural constituents with increasing amount of cold deformation. The transmission electron microscopy revealed the presence of strain‐induced α′ martensite, Moiré fringes, elongated worm‐like closed slip band channels and poorly developed dislocation cell structures. The volume percent of the constituent phases has been quantified by X‐ray diffraction analysis, which has also been substantiated by the image analysis result. The micro‐hardness measurement establishes that the work hardening capacity of austenite is more compared to ferrite.

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“…The growth of α'martensite may occur by the nucleation and coalescence of new α'-martensite nuclei repeatedly [35]. Despite the general idea that α'-martensite may form just in low SFE steels [9], however van Tol et al [37] reported small fractions of α'-martensite (<1.2%) in a TWIP steel during deep drawing by SFE of 50 mJ/m 2 . It can be expected that ɛ-martensite is the main precursor for the γ→α' transformation in this case [2].…”

Section: Deformation Mechanismsmentioning

confidence: 99%

The valuation of microstructural evolution in a thermo-mechanically processed transformation-twinning induced plasticity steel during strain hardening

Sabzi

Zarei-Hanzaki

Kaijalainen

et al. 2019

Materials Science and Engineering: A

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The successive evolution of martensitic transformation, twining and dislocation substructure formation in a transformation-twinning induced plasticity steel during room temperature straining was studied in the present work. This was materialized through microstructural observations and micro-texture examinations utilizing the electron backscattered diffraction method. To evaluate the strain hardening behaviour of the thermomechanically processed steel, tensile testing procedure to different strains at ambient temperature was practiced. The results indicated that the dislocation slip, mechanical twinning, and deformation induced ɛ/α'-martensite formation were involved as the deformation mechanisms. At the early stages of deformation, the dynamic formation of dislocation substructure, strain induced ɛ-martensite and twins from austenite played the main role in the observed work hardening behavior. Furthermore, the results demonstrated that the formation of α'-martensite was the dominant deformation mechanism at higher deformation levels. The corresponding texture analysis indicated to a double fibre texture formation, with a relatively stronger <111> at lower strains and a stronger <100> partial fibre parallel to tensile axis at higher strains. However, in the latter, the Cube, A and Goss Twin (GT)type textures were dominated. Decreasing of the Goss and S components were attributed to the preferential transformation of austenite to α'and ɛ-martensites, respectively. The presence of GT component even at higher strains approved the participation of deformation induced twinning as a dominant deformation mechanism up to failure.

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α′-Martensite formation in deep-drawn Mn-based TWIP steel

Cited by 40 publications

References 20 publications

Understanding martensite and twin formation in austenitic steels: A model describing TRIP and TWIP effects

Understanding martensite and twin formation in austenitic steels: A model describing TRIP and TWIP effects

Influence of Cold Rolling on Microstructural Evolution in 2205 Duplex Stainless Steel

The valuation of microstructural evolution in a thermo-mechanically processed transformation-twinning induced plasticity steel during strain hardening

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