Microstructures and Mechanical Properties of Fe-Mn-(Al, Si) TRIP/TWIP Steels

Ding, Hua; Tang, Zihan; Li, Wei; Wang, Mei; Song, Dandan

doi:10.1016/s1006-706x(06)60113-1

Cited by 67 publications

(37 citation statements)

References 6 publications

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“…However, one must recalculate the lattice parameter of the alloy, a fcc , together with the surface density, q, based on the addition of aluminum via Eqs. [24] and [23], respectively. The share of aluminum in the free energy of the fcc-to-hcp transformation, DG cfie , is also added to Eq.…”

Section: A Temperature Effectmentioning

confidence: 99%

“…Frommeyer et al [22] and Ding et al [23] showed that when the manganese content is increased, these steels show an exceptional formability as a result of twinninginduced plasticity (TWIP) or through multiple martensitic transformations, that is, transformation-induced plasticity (TRIP) effects. Based on their work, a pure TRIP mode changes to a mixture of TRIP and TWIP mechanisms by increasing the manganese content, and further additions of manganese will result in a pure TWIP effect.…”

Section: Introductionmentioning

confidence: 99%

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Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels

Saeed-Akbari

Imlau

Prahl

et al. 2009

Metall Mater Trans A

618

272

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A subregular solution thermodynamic model was used to calculate the stacking fault energies (SFEs) of high-manganese (10 to 35 wt pct) steels with carbon contents of 0 to 1.2 wt pct. Based on these calculations, composition-dependent diagrams were developed showing the regions of different SFE values for the mentioned composition range. These diagrams were called SFE maps. In addition, variations in the SFE maps were observed through increasing the temperature, aluminum content, and austenite grain size. These changes were seen either as an increasing trend of SFE caused by raising the temperature and aluminum content, or as a decreasing behavior caused by increasing the grain size. The SFE value of 20 mJ/m 2 within these diagrams was introduced as the upper limit for the strain-induced martensite formation. The variations in this limit caused by increasing the temperature and aluminum content were mathematically evaluated to find out the minimum amount of manganese that was required to avoid the martensitic transformation. By introducing the isocarbon and isomanganese diagrams of the SFE, it was seen that both temperature and aluminum had a greater effect on the SFE when added to the steels with the lower manganese contents. Moreover, by adding more aluminum to the composition of the high-manganese steels, its influence on the SFE decreased continuously.

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Section: A Temperature Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels

Saeed-Akbari

Imlau

Prahl

et al. 2009

Metall Mater Trans A

618

272

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“…La gran capacidad de absorción de energía cinética durante la deformación plástica del acero TWIP en este caso es vital (Kim, T.W. y Kim, Y.G., 1993;Apóstol et al, 2003;Ding et al, 2006;Ueji et al, 2008).…”

Section: Introductionunclassified

Propiedades mecánicas a tracción y mecanismos de endurecimiento de un acero TWIP a altas velocidades de deformación: relación de Hall-Petch

et al. 2014

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RESUMEN:Se ha estudiado la influencia de la velocidad de deformación y tamaño de grano en las propiedades mecánicas de un acero TWIP austenítico de composición 22% Mn, 0,6% C (% en masa). Para las velocidades de deformación de 9,4 s −1 y 265 s −1 a temperatura ambiente, se ha observado un comportamiento cuasi-lineal en las curvas tensión-deformación, típico en estos materiales que deforman por maclaje. Se ha mostrado que a altas velocidades de deformación la región con tasa de endurecimiento constante observada en aceros TWIP disminuye notablemente. Además, se ha obtenido la relación de Hall-Petch para cada velocidad de deformación. La pendiente de Hall-Petch K HP incrementa en función de la deformación en todos los casos. La dependencia de K HP con la velocidad de deformación podría ser causada por el calentamiento adiabático. ABSTRACT:Tensile properties and strengthening mechanisms of a TWIP steel at high strain rate: Hall-Petch relationship. The influence of strain rate and grain size on the mechanical properties of a 22% Mn, 0.6% C (mass %) austenitic TWIP steel has been studied. A typical quasi-linear stress-strain behaviour of TWIP steels that deform by twinning has been observed at strain rates of 9.4 s −1 and 265 s −1 and room temperature. At high strain rates, the constant work -hardening rate region typically observed in TWIP steel clearly shortens. In addition, the Hall-Petch relationship has been obtained for each strain rate. The Hall-Petch slope K HP increases as a function of strain in all cases. The dependence of the K HP on the strain rate could be adiabatic heating.

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“…This behavior was previously observed in other alloys, it was referred to as 'serrated flow' or 'repetitive yielding' or 'jerky flow', and has been often attributed to the Portevin -Le Chatelier (PLC) effect [11].…”

Section: Discussionmentioning

confidence: 57%

Room Temperature Plastic Flow Localization in a Mn-Alloyed Austenitic Steel

Firrao

Matteis

Mortarino

et al. 2008

MSF

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Abstract.A fully austenitic steel containing 0.5 wt.% C and 22 wt.% Mn was recently proposed for the fabrication of automotive body structures by room-temperature sheet forming, the goal being weight reduction and better crash performance owing to its much higher yield stress and elongation (as compared to presently employed ferritic and multiphase steels). Full-thickness tensile specimens, cut from as-produced sheets, were polished and tested at different strain rates, and the macroscopic surface relief eventually induced by the plastic deformation was recorded with a video camera. Between 0.3 and 0.4 true strain, successive macroscopic deformation bands (forming about 45° angle with the tensile axis and involving the full specimen width) travel along the specimen, a new one being nucleated as the previous reaches one of the specimen heads, whereas the gage displacement vs. stress curve shows a series of steps, each corresponding to the transit of a band through the gage length, and the cross-head displacement vs. stress curve shows isolated stress peaks, each immediately preceding the nucleation of a new band. Afterwards, and up to rupture, a series of stationary deformation bands appear, most being immediately adjacent to the preceding ones, with the stress vs. strain curve showing a series of serrations with large stress drops. As the strain rate is increased from 0.0004 to 0.4 s -1 , the overall flow stress slightly decreases and the mentioned plastic localization phenomena become less evident.

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Microstructures and Mechanical Properties of Fe-Mn-(Al, Si) TRIP/TWIP Steels

Cited by 67 publications

References 6 publications

Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels

Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels

Propiedades mecánicas a tracción y mecanismos de endurecimiento de un acero TWIP a altas velocidades de deformación: relación de Hall-Petch

Room Temperature Plastic Flow Localization in a Mn-Alloyed Austenitic Steel

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