Properties and Application of High-manganese TWIP-steels in Sheet Metal Forming

Busch, Christian; Hatscher, Ansgar; Otto, Manuel; Huinink, Stefan; Vucetic, Milan; Bonk, Christian; Bouguecha, Anas; Behrens, Bernd‐Arno

doi:10.1016/j.proeng.2014.10.121

Cited by 11 publications

(6 citation statements)

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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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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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“…10 with those from , Xu et al, 2012. For comparison purposes, the yield locus identified by [Busch et al, 2014] on a so-called TWIP/TRIP steel is also added. The higher value of parameter a in the present study leads to a less rounded shape of the yield surface (note that a value of a = 4 yields to an ellipse).…”

Section: Identification Of Constitutive Parametersmentioning

confidence: 99%

“…(3) [Xu et al, 2012]: (4) [Busch et al, 2014]. Stresses along RD and ND have been normalised by the yield stress under uniaxial tension along RD.…”

Section: Identification Of Constitutive Parametersmentioning

confidence: 99%

Fracture behaviour of a Fe–22Mn–0.6C–0.2V austenitic TWIP steel

Lorthios

Mazière

Lemoine

et al. 2015

International Journal of Mechanical Sciences

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International audienceThe mechanical behaviour of a 22Mn-0.6C-0.2V austenitic TWIP steel has been extensively characterised for a variety of strain ratios (from shear to biaxial stretching) using smooth and notched specimens. A constitutive model involving a non-isotropic yield function together with isotropic and/or kinematic hardening satisfactorily represented the experimental database. It was used to estimate local stress and strain fields and to derive a fracture criterion based on the equivalent stress and Lode angle that were expressed to be consistent with the constitutive equations describing the plastic flow behaviour. A weak dependence on hydrostatic stress further improves prediction of fracture initiation, with an average standard error of less than 5% over ten different mechanical tests

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“…Moreover, the excessive addition of manganese, aluminum and carbon caused difficulties in the industrial production. Recently, the Fe-18Mn-0.6C-1.5Al steel with above 900 MPa tensile strength and 50% elongation was developed to be manufactured as automotive anti-collision beams [11][12][13]. However, it was clear that the 1.5 wt% Al content could not meet the demand of the 10% weight reduction goal for the automotive steel.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism Investigation on Low Density 18Mn Steels under Different Solid Solution Treatments

Huo

Zhu

et al. 2021

Metals

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To meet the demand of the 10% weight reduction goal for automotive steel, the microstructure and mechanical properties of Fe–18Mn–Al–C steel with different carbon and aluminum contents were investigated under different solid solution treatments, and the deformation mechanisms of the experimental steels were elucidated. Aided by thermodynamic calculation, transmission electron microscopy (TEM) and in situ scanning electron microscope (SEM) analysis, it was shown that for the 18Mn–1.5Al experimental steel with about 20 mJ/m2 stacking fault energy (SFE), the twinning-induced plasticity (TWIP) effect always dominated in this steel after different solid solution treatments under tensile deformation. With the 7 wt% aluminum addition, the SFE of austenite was affected by temperature and the range of SFE was between 60 and 65 mJ/m2. The existence of δ-ferrite obviously inhibited the TWIP effect. With the increase in the solution treatment temperature, δ-ferrite gradually transformed into the austenite, and the n-value remained low and stable in a large strain range, which were caused by the local hardening during the tensile deformation. Due to the difference in the deformability of the austenite and δ-ferrite structure as well as the inconsistent extension of the slip band, the micro-cracks were easily initiated in the 18Mn–7Al experimental steel; then, it exhibited lower plasticity.

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Properties and Application of High-manganese TWIP-steels in Sheet Metal Forming

Cited by 11 publications

References 1 publication

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

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

Fracture behaviour of a Fe–22Mn–0.6C–0.2V austenitic TWIP steel

Deformation Mechanism Investigation on Low Density 18Mn Steels under Different Solid Solution Treatments

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