Effect of carbon content on the mechanical properties and microstructural evolution of Fe–22Mn–C steels

Ghasri-Khouzani, Morteza; McDermid, Joseph R.

doi:10.1016/j.msea.2014.10.042

Cited by 87 publications

(69 citation statements)

References 32 publications

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“…Meta-atom potential for TWIP steel Fig. 3(a-c) plot the meta atom potential for a TWIP steel with composition of Fe-22 wt%Mn-0.6 wt%C (Cooman et al, 2011;Ghasri-Khouzani and McDermid, 2015;Pierce et al, 2014). Table 1 lists the material properties.…”

Section: Applicabilitymentioning

confidence: 99%

Atomistic simulation for deforming complex alloys with application toward TWIP steel and associated physical insights

Wang

Liu

et al. 2017

Journal of the Mechanics and Physics of Solids

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A B S T R A C TThe interest in promoting deformation twinning for plasticity is mounting for advanced materials. In contrast to disordered grain boundaries, highly organized twin boundaries are beneficial to promoting strength-ductility combination. Twinning deformation typically involves the kinetics of stacking faults, its interplay with dislocations, as well as the interactions between dislocations and twin boundaries. While the latter has been intensively studied, the dynamics of stacking faults has been rarely touched upon. In this work, we report new physical insights on the stacking fault dynamics in twin induced plasticity (TWIP) steels. The atomistic simulation is made possible by a newly introduced approach: meta-atom molecular dynamics simulation. The simulation suggests that the stacking fault interactions are dominated by dislocation reactions that take place spontaneously, different from the existing mechanisms. Whether to generate a single stacking fault, or a twinning partial and a trailing partial dislocation, depends upon a unique parameter, namely the stacking fault energy. The latter in turn determines the deformation twinning characteristics. The complex twin-slip and twin-dislocation interactions demonstrate the dual role of deformation twins as both the dislocation barrier and dislocation storage. This duality contributes to the high strength and high ductility of TWIP steels.

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Section: Applicabilitymentioning

confidence: 99%

Atomistic simulation for deforming complex alloys with application toward TWIP steel and associated physical insights

Wang

Liu

et al. 2017

Journal of the Mechanics and Physics of Solids

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“…Numerous studies have been carried out on the microstructure, mechanical properties and plastic deformation mechanisms of TWIP steels [1,[4][5][6][7][8][9][10]. The weldability of TWIP steel sheets is another matter of concern that needs to be studied in more detail since the use of metal sheets in the automobile sector inevitably involves welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Weld Current on the Microstructure and Mechanical Properties of a Resistance Spot-Welded TWIP Steel Sheet

Tutar

Aydın

Bayram

2017

Metals

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Abstract:In this study the effect of the weld current on the microstructure and mechanical properties of a resistance spot-welded twinning-induced plasticity (TWIP) steel sheet was investigated using optical microscopy, scanning electron microscopy-electron back-scattered diffraction (SEM-EBSD), microhardness measurements, a tensile shear test and fractography. Higher weld currents promoted the formation of a macro expulsion cavity in the fusion zone. Additionally, higher weld currents led to a higher indentation depth, a wider heat-affected zone (HAZ), coarser grain structure and thicker annealing twins in the HAZ, and a relatively equiaxed dendritic structure in the centre of the fusion zone. The hardness values in the weld zone were lower than that of the base metal. The lowest hardness values were observed in the HAZ. No strong relationship was observed between the hardness values in the weld zone and the weld current. A higher joint strength, tensile deformation and failure energy absorption capacity were obtained with a weld current of 12 kA, a welding time of 300 ms and an electrode force of 3 kN. A complex fracture surface with both brittle and limited ductile manner was observed in the joints, while the base metal exhibited a ductile fracture. Joints with a higher tensile shear load (TSL) commonly exhibited more brittle fracture characteristics.

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“…Indeed, the outer zone of the sub-surface is characterized by a higher amount of aʼ-martensite (low C and Mn content), whereas the presence of aʼ-martensite is lower towards the bulk, since Mn content approaches the nominal content. This highlights that the ductility of the sub-surface zone is quite low with respect to the bulk for the TWIP steel (Ghasri-Khouzani and McDermid, 2015). This microstructural heterogeneity in the sub-surface for TWIP steel affects the ductility of the material in subsequent mechanical tests.…”

Section: Hardness In the Annealed Samples Of Twip Steelmentioning

confidence: 95%

“…Over last years, the twinning -induced plasticity Fe-Mn-C (TWIP) steels have been the center of intensive research works due to their outstanding tensile strength -ductility combination which arises from the formation of extensive mechanical twinning under mechanical loads Cornette et al, 2005;Scott et al, 2006;Bouaziz et al, 2008;Bouaziz et al, 2011;Galán et al, 2012;Gil Sevillano and De las Cuevas., 2012;Chen et al, 2013;De las Cuevas et al, 2014;Ghasri-Khouzani and McDermid, 2015;Pierce et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Pérdida de ductilidad debido a la descarburación y pérdida de Mn de un acero TWIP de tamaño de grano grosero

Jiménez

Sevillano

2017

REVMETAL

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A clear transition in the tensile ductility behavior has been observed for grain sizes D in the range of 15 μm -20 μm (1.50 μm ≤ D < 50 μm) in a 22% Mn, 0.6% C (in mass %) TWIP steel. This behavior is a combination of the intrinsic effect of grain size D on strength and work hardening rate of the material, with an extrinsic effect, superficial decarburization and Mn depletion processes occurred during annealing treatments at T ≥ 1000 ºC. In the present work, this extrinsic effect happened in TWIP steel has been studied in depth. GDOES (Glow Discharge Optical Emission Spectrometry) analyses have been carried out in order to study quantitatively the C and Mn concentration profiles. The depth of surface decarburization has been modeled by using Birks-Jackson theory. Two micro-constituents have been observed via Ferritoscope into decarburized volume: α'-martensite and γ-austenite. The ductility of coarse-grained TWIP steel, subjected for high annealing temperatures and long annealing times, declines as a consequence of the formation of α'-martensite and less stable γ-austenite with lower stacking fault energy, SFE, due to the Mn depletion in the decarburized volume. RESUMEN: Pérdida de ductilidad debido a la descarburación y pérdida de Mn de un acero TWIP de tamaño de grano grosero.Se ha observado una clara transición de la ductilidad a tracción con el tamaño de grano D del orden 15 μm -20 μm (1,50 μm ≤ D < 50 μm) en un acero TWIP, 22% de Mn, 0,6% de C (% en masa). Este comportamiento es una combinación de un efecto intrínseco del tamaño de grano D en la resistencia y el endurecimiento por deformación del material, con un efecto extrínseco, proceso de descarburación superficial y pérdida de Mn ocurrido durante los tratamientos de recocido a T ≥ 1000 ºC. En el presente trabajo se ha estudiado en profundidad este efecto extrínseco sucedido en el acero TWIP. Se han realizado análisis por GDOES (Espectroscopia Óptica de Descarga Luminiscente) para estudiar cuantitativamente los perfiles de concentración de C y Mn. La profundidad de descarburación superficial se ha modelizado usando la teoría de Birks-Jackson. Se ha observado vía ferritoscopio que, en el volumen descarburizado, coexisten dos microconstituyentes: α'-martensita y γ-austenita. La ductilidad del acero TWIP de tamaño de grano grosero, sometido a altas temperaturas y largos tiempos de recocido, disminuye como consecuencia de la formación de α'-martensita y γ-austenita menos estable con menor energía de defectos de apilamiento, EDA, debido a la pérdida de Mn en el volumen descarburizado.

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Effect of carbon content on the mechanical properties and microstructural evolution of Fe–22Mn–C steels

Cited by 87 publications

References 32 publications

Atomistic simulation for deforming complex alloys with application toward TWIP steel and associated physical insights

Atomistic simulation for deforming complex alloys with application toward TWIP steel and associated physical insights

Effect of Weld Current on the Microstructure and Mechanical Properties of a Resistance Spot-Welded TWIP Steel Sheet

Pérdida de ductilidad debido a la descarburación y pérdida de Mn de un acero TWIP de tamaño de grano grosero

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