Dependence of deformation twinning on grain orientation in a high manganese steel

Yang, Ping; Xie, Qingge; Meng, Liang; Ding, Hua; Tang, Zuoyin

doi:10.1016/j.scriptamat.2006.06.004

Cited by 209 publications

(89 citation statements)

References 7 publications

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“…They confirm that due to high chemical composition in high-Mn steels; expulsion occurred earlier and high welding current increases the cracking tendency because of increasing nugget pressure and the tensile stress in heat affected zone (HAZ) during cooling [11]. Deformation behavior of high-manganese TWIP steels has been widely studied in relation to microstructure and texture evolution by microscopy analysis scanning electron microscope (SEM) and transmission electron microscopy (TEM), X-ray diffraction (XRD) measurements [2,[12][13][14][15][16][17][18][19][20][21]. However, weldability of such steel has been poorly investigated.…”

Section: Methodsmentioning

confidence: 97%

Properties of Resistance Spot-Welded TWIP Steels

Zeytin

Emre

Kaçar

2017

Metals

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High manganese TWIP (twinning-induced plasticity) steels are particularly attractive for automotive applications because of their exceptional properties of strength combined with an excellent ductility. However, the microstructure and properties of TWIP steels are affected by excessive thermal cycles, such as welding and heat treatment. This paper deals with characterization and understanding the effect of welding current and time on the mechanical properties and microstructure of the resistance spot welded TWIP steel. For this purpose, weld nugget diameter was evaluated and the hardness, tensile shear strength of the weldment, and failure mode of samples were also determined. It has been found that the tensile shear strength of the samples increased with increasing welding current and welding time without expulsion, which reduces the strength of the weldment. Tensile shear samples failed by a partial interfacial fracture mode for low-heat input welds. The pullout fractures were observed with a sufficient heat input without expulsion.

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Section: Methodsmentioning

confidence: 97%

Properties of Resistance Spot-Welded TWIP Steels

Zeytin

Emre

Kaçar

2017

Metals

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“…Another proposed mechanism for the weakening of the 100  fibre involves the slip of individual partial dislocations which is associated with heavy deformation faulting in low stacking fault energy materials [5]. Earlier experimental investigations detailing the uniaxial tensile loading of TWIP steels have returned the typical fcc double fibre texture along with a relatively stronger 111  fibre [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension

2013

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. (2013). Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension. Acta Materialia, 61 (7), 2671-2691.Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension AbstractA combination of electron back-scattering diffraction and X-ray diffraction was used to track the evolution of the microstructure and texture of a fully recrystallized Fe-24 Mn-3 Al-2 Si-1 Ni-0.06 C twinning-inducedplasticity steel during interrupted uniaxial tensile testing. Texture measurements returned the characteristic double fibre texture for face-centred cubic materials, with a relatively stronger 〈1 1 1〉 and a weaker 〈1 0 0〉 partial fibre parallel to the tensile axis. The interaction with the stable 〈1 1 1〉 oriented grains results in preferential plastic flow in the unstable 〈1 1 0〉 oriented grains. Consequently, the grains oriented along the 〈1 1 0〉 and 〈1 0 0〉 fibres record the highest and lowest values of intragranular local misorientation, respectively. The viscoplastic self-consistent model was used to simulate the macroscopic stress-strain response as well as track the evolution of bulk crystallographic texture by detailing the contributions of perfect and/or partial slip, twinning and latent hardening. The simulations revealed the dominant role of perfect slip and the limited volume effect of twinning on the texture development. The effects of initial orientation and grain interaction on the overall orientation stability during uniaxial tension showed that while the 〈1 0 0〉 fibre remains stable and does not affect the unstable orientations along the 〈1 1 0〉 fibre, the orientations along the stable 〈1 1 1〉 fibre strongly affect the unstable 〈1 1 0〉 orientations. on the overall orientation stability during uniaxial tension showed that while the 100  fibre remains stable and does not affect the unstable orientations along the 110  fibre, the orientations along the stable 111  fibre strongly affect the unstable 110  orientations.

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“…However, such a simplified picture was found to be inadequate to elucidate the simultaneous activation of different modes seen in experiments (2,5,6,15). It has emerged that additional factors should be taken into account in conjunction with the GPF energy for describing the deformation behavior.The microstructure of materials, such as grain size and orientation, is known to influence the plastic deformation mechanism (1,15,(19)(20)(21)(22)(23). In nanocrystalline metals, the grain boundarymediated process becomes dominant (24, 25) but the size limit of the dislocation activation is extended to smaller grains at highpressure conditions (26).…”

mentioning

confidence: 99%

“…The microstructure of materials, such as grain size and orientation, is known to influence the plastic deformation mechanism (1,15,(19)(20)(21)(22)(23). In nanocrystalline metals, the grain boundarymediated process becomes dominant (24, 25) but the size limit of the dislocation activation is extended to smaller grains at highpressure conditions (26).…”

mentioning

confidence: 99%

Theory for plasticity of face-centered cubic metals

Koo

Lee

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

100

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The activation of plastic deformation mechanisms determines the mechanical behavior of crystalline materials. However, the complexity of plastic deformation and the lack of a unified theory of plasticity have seriously limited the exploration of the full capacity of metals. Current efforts to design high-strength structural materials in terms of stacking fault energy have not significantly reduced the laborious trial and error works on basic deformation properties. To remedy this situation, here we put forward a comprehensive and transparent theory for plastic deformation of face-centered cubic metals. This is based on a microscopic analysis that, without ambiguity, reveals the various deformation phenomena and elucidates the physical fundaments of the currently used phenomenological correlations. We identify an easily accessible single parameter derived from the intrinsic energy barriers, which fully specifies the potential diversity of metals. Based entirely on this parameter, a simple deformation mode diagram is shown to delineate a series of convenient design criteria, which clarifies a wide area of material functionality by texture control.planar fault | twinning | slip | molecular dynamics E lastic deformation of metals is fully described by Hooke's law, connecting stress and strain via the usual elastic parameters. In contrast, plasticity is a property that originates from dislocations and involves transitions over various competing energy barriers. A phenomenological description of the plastic regime based merely on the stacking fault energy (SFE) has been widely used by material scientists (1-11), even though it is not at all clear whether such an equilibrium property can really capture the complexity of plastic deformation. To try to mend this situation, researchers have introduced the so-called generalized planar fault (GPF) energy, which comprises several intrinsic energy barriers (IEBs) and thus provides detailed information on the deformation process itself (12, 13). Nevertheless, the GPF energy has not yet been fully recognized because of its inherent difficulty in experimental validation (14). In the present paper we solve this and introduce an approach that is fully transparent, where there are no such ambiguities.Face-centered cubic (fcc) metals possess three distinct deformation mechanisms: stacking fault (SF), twinning (TW), and full slip (SL) (2,(5)(6)(7)15). Many studies tried to relate the deformation of fcc metals to the GPF energy. For example, the competition between TW and SL was explained by a relative change between the intrinsic energy barriers, assuming the activation of the lowest barrier mode (16)(17)(18). However, such a simplified picture was found to be inadequate to elucidate the simultaneous activation of different modes seen in experiments (2,5,6,15). It has emerged that additional factors should be taken into account in conjunction with the GPF energy for describing the deformation behavior.The microstructure of materials, such as grain size and orientation, is known to in...

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Dependence of deformation twinning on grain orientation in a high manganese steel

Cited by 209 publications

References 7 publications

Properties of Resistance Spot-Welded TWIP Steels

Properties of Resistance Spot-Welded TWIP Steels

Microstructure and texture evolution in a twinning-induced-plasticity steel during uniaxial tension

Theory for plasticity of face-centered cubic metals

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