Effects of Stacking Fault Energy on Deformation Mechanisms in Al-Added Medium Mn TWIP Steel

Kalsar, Rajib; Khandal, Priyanka; Suwas, Satyam

doi:10.1007/s11661-019-05274-1

Cited by 17 publications

(5 citation statements)

References 70 publications

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“…These SFs are supposed to impede dislocation motion and induce a strong strain-hardening effect, retaining the high strain-hardening rate and forming the plateau. With a further increase in tensile strain, the local stress reaches the critical value for deformation-induced phase transformation, and thin HCP lamellae are activated [ 28 , 29 ], which can effectively impede dislocation motion [ 30 ]. During the deformation process, nano-sized HCP lamellae are alternately arranged, which relieves the local stress concentration of the alloy and delays the necking process [ 31 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of V Addition on the Deformation Mechanism and Mechanical Properties of Non-Equiatomic CoCrNi Medium-Entropy Alloys

et al. 2023

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Equiatomic CoCrNi medium-entropy alloys exhibit superior strength and ductility. In this work, a non-equiatomic CoCrNi alloy with low stacking fault energy was designed, and different fractions of V were added to control the stacking fault energy and lattice distortion. Mechanical properties were evaluated by tensile tests, and deformation microstructures were characterized by transmission electron microscope (TEM). The main deformation mechanisms of CoCrNiV alloy with low V content are dislocation slip, stacking faults, and deformation-induced HCP phase transformation, while the dominant deformation patterns of CoCrNiV alloy with high V contents are dislocation slip and stacking faults. The yield strength increases dramatically when the V content is high, and the strain-hardening behavior changes non-monotonically with increasing the V content. V addition increases the stacking fault energy (SFE) and lattice distortion. The lower strain-hardening rate of 6V alloy than that of 2V alloy is dominated by the SFE. The higher strain-hardening rate of 10V alloy than that of 6V alloy is dominated by the lattice distortion. The effects of V addition on the SFE, lattice distortion, and strain-hardening behavior are discussed.

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Section: Discussionmentioning

confidence: 99%

Effects of V Addition on the Deformation Mechanism and Mechanical Properties of Non-Equiatomic CoCrNi Medium-Entropy Alloys

et al. 2023

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“…At least 7 mJ m À2 SFE can be increased by 1% Al addition. [138] Additionally, as SFE rises, adding Al suppresses the TRIP and TWIP effects. [58] Si Si addition results in a reduction in SFE.…”

Section: Elementsmentioning

confidence: 99%

“…These results are in good agreement with a few other reported studies. [131,138] In a separate study, Shao et al [134] systematically investigated the effects of Mn content varying within the range of 18-30 wt% as well as applied strain amplitude levels on the twin formation and, subsequently, fatigue performance of Fe-xMn-0.6C (wt%) steel. Initial hardening followed by cyclic saturation and/or cyclic softening is noted for the steels.…”

Section: Twip-assisted Mechanismmentioning

confidence: 99%

A Systematic Review of Medium‐Mn Steels with an Assessment of Fatigue Behavior

Kumar,

Sen,

Bandyopadhyay

2023

steel research int.

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Deformation‐induced mechanisms, namely, transformation‐induced plasticity (TRIP) and twinning‐induced plasticity (TWIP), are primarily responsible for improved tensile properties in medium‐Mn steels. Additionally, lower density and processing costs make these steels useful in various industries, particularly the automotive industry, which mandates a good understanding of underlying processing–microstructure–property correlations. Therefore, the present study reviews different thermomechanical processes and corresponding microstructural evolutions, followed by mechanical properties. In addition, an assessment of the fatigue behavior of medium‐Mn steels based on duplex or multiphase microstructure and associated mechanisms has been presented. In high‐cycle fatigue (HCF) loading, strain‐induced martensite formation through TRIP at the crack tip is a barrier to dislocation motion. It deviates the crack propagation path to adjacent phases, which results in higher fatigue life. On the other hand, relatively high martensite boundaries initiate microcracks and accelerate crack propagation, resulting in lower life in low‐cycle fatigue (LCF). However, the TWIP mechanism prevents cyclic softening and promotes cyclic saturation, extending fatigue life. The compositions of medium‐Mn steel for enhanced fatigue resistance have been proposed. To that end, it is hypothesized that the TRIP + TWIP mechanisms lead to exceptional LCF performance. Further, microalloyed medium‐Mn steels are expected to exhibit improved LCF and HCF behavior.

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“…The fracture records the irreversible deformation of the material before fracture under the coupling action of the applied load and the service environment and the whole process of crack initiation and propagation until the final fracture. At the same time, the fracture morphology is affected by factors such as stress state, environmental medium, and material properties [14][15][16]. Usually, the typical hydrogen embrittlement fracture is characterized by the intergranular fracture morphology, and the degree of convexity and concave of the fracture varies greatly with different hydrogen embrittlement susceptibilities.…”

Section: Interface Of Metal Materialsmentioning

confidence: 99%

Heterogeneous Deformation and Microstructure of TWIP Steel under Damage and Fracture

Dong

Zhang

Hou

2022

Journal of Nanomaterials

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Materials have always been a research hotspot in the chemical industry. With the continuous development of technology, the iteration of materials research has become faster and faster. Steel has strong toughness and tensile strength, and it is widely used in construction and other fields. However, one problem that cannot be avoided is the fracture of steel. The purpose of this paper is to analyze the damage and fracture of TWIP steel. In this paper, a microstructure characterization calculation method based on TWIP is proposed, which can effectively analyze the fracture surface, and for the performance of TWIP steel, this paper uses two different TWIP steels for comparative analysis. The results of this paper show that the HDI hardening rate of 22Mn0.6C TWIP steel is higher than that of 22Mn0.6C3Al TWIP steel.

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Effects of Stacking Fault Energy on Deformation Mechanisms in Al-Added Medium Mn TWIP Steel

Cited by 17 publications

References 70 publications

Effects of V Addition on the Deformation Mechanism and Mechanical Properties of Non-Equiatomic CoCrNi Medium-Entropy Alloys

Effects of V Addition on the Deformation Mechanism and Mechanical Properties of Non-Equiatomic CoCrNi Medium-Entropy Alloys

A Systematic Review of Medium‐Mn Steels with an Assessment of Fatigue Behavior

Heterogeneous Deformation and Microstructure of TWIP Steel under Damage and Fracture

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