A novel process combining thermal deformation and intercritical annealing to enhance mechanical properties and avoid Lüders strain of Fe-0.2C–7Mn TRIP steel

Wang, Yang; Zhang, Mei; Cen, Qiongying; Sun, Xiaoning

doi:10.1016/j.msea.2022.142849

Cited by 15 publications

(4 citation statements)

References 47 publications

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“…Medium manganese steels (MMS) are promising structural materials, attracting intensive attentions due to their superior comprehensive mechanical properties, such as high strength, excellent ductility and good low-temperature toughness, attributing to the introduce of reversed austenite (RA) [1][2][3][4]. The RA is formed by the intercritical annealing or tempering (termed as IA or IT) process, where the specimen was heated to α+γ two phase region for C and Mn partition [5,6].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Strength and Toughness of V-modified 0.2C-5.0Mn Steel by Short-Time Partial Austenitization Process

Zheng,

Liu,

Tong

et al. 2023

Preprint

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In order to obtain the good match between yield strength and low-temperature toughness, the short-time partial austenitization (SPA) process was employed for V-microalloying 0.22C-5.24Mn steel. The initial microstructure after intercritical tempering was dual-phase ferrite and reversed austenite (RA), while the final microstructure was consisted of ferrite, RA and secondary martensite (SM) after subjected to SPA process. (V, Mo)C with disc-like morphology mainly precipitated during intercritial tempering, and the aspect ratio of particle decreased, leading to the appearance of near-spherical morphology. After subjected to SPA process, the resultant multiphase hierarchical microstructure (three layers: out layer of ferrite, interlayer of SM and inner layer RA) enabled high yield strength of 1097 MPa, total elongation of 14%, and impressive impact energy of 33.3 J at -20 °C. The strengthening contribution of (V, Mo)C precipitation was estimated about 108 MPa.

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Section: Introductionmentioning

confidence: 99%

Optimizing the Strength and Toughness of V-modified 0.2C-5.0Mn Steel by Short-Time Partial Austenitization Process

Zheng,

Liu,

Tong

et al. 2023

Preprint

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“…As a typical 3rd generation advanced high strength steel (AHSS), medium Mn steels are drawing more and more attention due to the excellent mechanical properties after intercritical annealing (IA) treatment [1,2]. Among them, medium Mn steels containing 5∼12% Mn usually show an ultrafine dual-phase microstructure composed of ferrite and retained austenite (RA) after IA [3,4]. Austenite grains with appropriate stability transform to martensite gradually during plastic deformation (TRIP effect), which is beneficial to the strength and plasticity [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…The kinetics of static softening is usually described by a modified Avrami equation [33,34], which can be expressed as equation (4).…”

mentioning

confidence: 99%

Study on static softening behavior and hot working performance of Fe-0.2C-7Mn steel

Wang

Cen

Zhang

2022

Mater. Res. Express

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Static softening behavior and hot working performance of medium Mn steel (Fe-0.2C-7Mn) are studied by 2-step and interrupt hot compression test with a Gleeble-3500 thermal-mechanical simulator. The results show that static softening behavior of the steel exhibits obvious sensitivity to the deformation temperature, inter-pass time and strain rate. But deformation temperature has a more significant effect on the static recrystallization (SRX) grain size than strain rate. 3D hot working processing maps are established, that low temperature and medium strain rate (850°C~925°C and 0.02s-1~0.3s-1) are the preferred thermal deformation conditions for the test steel. Microstructure observations indicates that both static recovery (SRV) and SRX occur within inter-pass time, and SRV is the predominant mechanism in determining softening fraction. The microstructure is composed of film-like α at room temperature, and most of the nucleation of SRX preferably take place at triple junctions of grains or prior grain boundaries. Besides, high-angle grain boundaries (HAGBs) migration produce twin boundaries during grain growth and the main nucleation mechanism of the SRX is strain-induced boundary migration. The kinetics model of static softening is established and the experimental values are consistent with predicted ones, which proves the reliability of the model.

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“…The superior mechanical performance of high-Mn steels originates from their ability to synergistically activate multiple strengthening mechanisms, including dislocation motions, TWinning-Induced-Plasticity (TWIP), and TRansformation-Induced-Plasticity (TRIP) effects. The TWIP effect can be achieved by introducing dense strain-induced twin boundaries (TBs) to impede dislocation motion, while the TRIP effect can be activated when the parent austenitic face-centered cubic (FCC) austenite is transferred into martensite with hexagonal close-packed (HCP)/body-centered tetragonal (BCT) structure under strain [7]. The dominant deformation mechanism of the high-Mn steels is strongly dependent on their inherent stacking fault energy (SFE) [8][9][10], which is defined as the excess energy required to dissociate perfect dislocations and separate partial dislocations infinitely.…”

Section: Introductionmentioning

confidence: 99%

In situ neutron diffraction reveals the effect of Cu micro-alloying on low-temperature tensile properties of TWIP steels

Tang¹,

Jiang²,

Liu³

et al. 2022

Materials Science and Engineering: A

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A novel process combining thermal deformation and intercritical annealing to enhance mechanical properties and avoid Lüders strain of Fe-0.2C–7Mn TRIP steel

Cited by 15 publications

References 47 publications

Optimizing the Strength and Toughness of V-modified 0.2C-5.0Mn Steel by Short-Time Partial Austenitization Process

Optimizing the Strength and Toughness of V-modified 0.2C-5.0Mn Steel by Short-Time Partial Austenitization Process

Study on static softening behavior and hot working performance of Fe-0.2C-7Mn steel

In situ neutron diffraction reveals the effect of Cu micro-alloying on low-temperature tensile properties of TWIP steels

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