Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

Chun-quan, Liu; Qi-chun, Peng; Xue, Zhengliang; Wang, Shijie; Yang, Chengwei

doi:10.3390/ma11112242

Cited by 21 publications

(16 citation statements)

References 25 publications

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“…The same tendency was also observed in multiphase steels that were composed of ferrite, bainite, and retained austenite [38,39], high-Mn steels showing a TRIP effect [40], quenching and partitioning steels [24], and cold-rolled medium-Mn steels [41]. [42] in 0.2C-9.7Mn-3.2Al-3.4Si steel and by Liu et al [43] in 0.12C-5Mn-1Al-0.2Mo-0.05Nb steel that was deformed at room temperature. The freshly formed strain-induced martensite contributes to the occurrence of cleavage-type fracture [42].…”

Section: Volume Fraction Of Retained Austenitesupporting

confidence: 74%

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

et al. 2019

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The study addressed the microstructure and mechanical properties of hot-rolled advanced high-strength medium manganese steel. Some of the curves that were obtained in static tensile tests at deformation temperatures of 20–200 °C showed the occurrence of the heterogeneous plastic deformation phenomenon, called the Portevin-Le Chatelier (PLC) effect. The deformation temperature significantly influenced a serration character. The correlations between the deformation temperature, serration range, microstructural features, and fracture behavior were investigated. The curves showed no Lüders elongation as a result of the thermomechanical processing applied. The serrated flow phenomenon was observed at 60 and 140 °C. The serration type was different and the most enhanced at 140 °C, where the PLC effect was present in both uniform and post-uniform elongation ranges. The disappearance of serrations at 200 °C was related to the increased diffusion intensity.

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Section: Volume Fraction Of Retained Austenitesupporting

confidence: 74%

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

et al. 2019

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“…The length of austenite deformation strain (S2 and S3) of CQ1-ART, CQ2-ART and CQ3-ART samples were ~47.4%, ~55.3% and ~35.3%, respectively. Combining the result presented in Figure 4c and Equation (9), only a small part of austenite content undergoes SIMT to produce a TRIP effect, which means that fatm × σatm is too small at the corresponding true stress ε. It is worth noting that the CQ3-ART sample has a higher austenite volume fraction (~64.8 vol.%), of which only 58% produces The length of austenite deformation strain (S2 and S3) of CQ1-ART, CQ2-ART and CQ3-ART samples were~47.4%,~55.3% and~35.3%, respectively.…”

Section: Deformation Behavior and Austenite Stabilitymentioning

confidence: 85%

“…When the intercritical annealing temperature exceeded 690 • C, the fresh martensite is formed during the annealing and cooling process resulting in a gradual decrease in RA content. Mn is the critical element for stabilizing austenite, which has been discussed in our previous studies [8,9]. Thus, the intercritical annealing temperature can be set to 690 • C in order to increase the Mn content in the experimental steel to obtain a larger RA content at ambient temperature.…”

Section: Microstructural Design Strategiesmentioning

confidence: 99%

“…These steels are very promising for automotive applications due to their excellent strength, elongation, crashworthiness and safety [4][5][6]. Since the excellent comprehensive performance of medium Mn steel strongly depends on the high RA content with appropriate stability, it is very important to control the RA [7][8][9][10]. Medium Mn steel is generally produced by austenite reverse transformation (ART) process to obtain a certain amount of metastable RA at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Medium Mn steel is generally produced by austenite reverse transformation (ART) process to obtain a certain amount of metastable RA at ambient temperature. Generally, the mechanical stability of RA is affected by its chemical composition (C and Mn content) [8], grain size [9,10], and morphology [11]. RA with excessive stability cannot exhibit an extensive transformation induced plasticity (TRIP) effect, which hinders the transformation of RA to martensite under continuous strain conditions, resulting in poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Cyclic-Quenching-ART for Stabilizing Austenite in Nb–Mo Micro-Alloyed Medium-Mn Steel

Liu

Qi-chun

Xue

et al. 2019

Metals

Self Cite

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In the context of obtaining an excellent elongation and tensile-strength combination in the third generation of advanced high strength steel, we emphasized the practical significance of adjusting the retained austenite fraction and stability in medium-Mn steel to obtain better mechanical properties. A novel cyclic quenching and austenite reverse transformation (CQ-ART) was used to obtain a large retained austenite content in Fe-0.25C-3.98Mn-1.22Al-0.20Si-0.19Mo-0.03Nb (wt.%) Nb–Mo micro-alloyed medium-Mn steel. The results show that after twice cyclic quenching and ART, the alloy exhibited optimum comprehensive properties, characterized by an ultimate tensile strength of 838 MPa, a total elongation of 90.8%, a product of strength and elongation of 76.1 GPa%, and the volume fraction of austenite of approximately 62 vol.%. The stability of retained austenite was significantly improved with the increasing of the number of cyclic quenching. Moreover, the effects of CQ-ART on the microstructure evolution, mechanical properties, C/Mn partitioning behavior, and austenite stability were investigated. Further, the strengthening effect of microalloying elements Nb–Mo was also discussed.

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Thermodynamic Stacking Fault Energy, Chemical Composition, and Microstructure Relationship in High-Manganese Steels

Ribamar

Andrade

Miranda

et al. 2020

Metall Mater Trans A

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Stacking fault energy (SFE) is related to activating complex high strength and ductility mechanisms such as transformation-induced plasticity and twinning-induced plasticity effects. This type of energy can be estimated by many different methods and its importance is in its ability to predict microstructure and phase transformation behavior when the material is submitted to stress/strain. In order to study the SFE, chemical composition, and microstructure relationships, eleven different welding parameters were chosen to obtain a large range of dilution levels. A new tubular wire electrode of high-manganese steel (21 wt pct Mn) was used as the consumable and an SAE 1012 steel plate (0.6 wt pct Mn) as the base metal in a flux-cored arc welding process. These welding parameters were related to the phases formed and phase transformation behavior in the fusion zone. The SFE of the austenite phase was calculated using a thermodynamic model. The welding parameters produced SFE values in the range of À 5 to 7 mJ/m 2 . -martensite and austenite were observed in all samples, but a¢-martensite was only found in those that presented negative SFE values, i.e., those with lower Mn content. Chemical Gibbs Free energy was the component with the most influence on the SFE. Nanoindentation detected the phase transformations during hardness testing for the medium and low dilution levels used, while the high dilution levels presented the highest hardness and modulus of elasticity values, and the lowest elastic and plastic deformation values. The results provide an improved method to develop high-manganese steels with microstructure control through welding parameters.

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Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

Cited by 21 publications

References 25 publications

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

A Novel Cyclic-Quenching-ART for Stabilizing Austenite in Nb–Mo Micro-Alloyed Medium-Mn Steel

Thermodynamic Stacking Fault Energy, Chemical Composition, and Microstructure Relationship in High-Manganese Steels

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