Microstructure and mechanical properties of hot-rolled medium-Mn steel containing 3% aluminum

Shao, Chengwei; Wang, Hui; Zhang, Yongjian; Zhao, Xiaoli; Weng, Yuqing

doi:10.1016/j.msea.2016.11.036

Cited by 89 publications

(44 citation statements)

References 38 publications

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“…The relationship between the UTS and TE can be expressed by the so‐called banana curves for various AHSS grades. Figure summarizes the UTS and TE data of medium Mn steels in this study and in available literatures with similar Mn content levels . As shown, significantly superior tensile properties could be obtained in this study.…”

Section: Grain Size Volume Faction Of Ra and Tensile Test Results Fsupporting

confidence: 71%

The Novel Combination of Strength and Ductility in 0.4C‐7Mn‐3.2Al Medium Manganese Steel by Intercritical Annealing

Wang

Huang

et al. 2019

steel research int.

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By altering the temperature and duration of intercritical annealing (IA), the mechanical stability of retained austenites (RAs) is intentionally regulated in newly designed cold-rolled medium manganese steel of Fe-0.4C-7Mn-3.2Al (in wt%). Consequently, a novel combination of ultimate tensile strength (UTS) and total elongation (TE) (e.g., 1118 MPa and 67%) is obtained in duplex steel, and the corresponding product of UTS and TE can reach 75 GPa%. Both twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) take effect step by step during deformation and are conducive to the outstanding properties.

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Section: Grain Size Volume Faction Of Ra and Tensile Test Results Fsupporting

confidence: 71%

The Novel Combination of Strength and Ductility in 0.4C‐7Mn‐3.2Al Medium Manganese Steel by Intercritical Annealing

Wang

Huang

et al. 2019

steel research int.

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“…In this case, the morphology of cold-rolled medium-Mn steels is similar to that of hot-rolled medium-Mn steels [36][37][38][39][40][41]. It was most likely due to the sluggish recovery and recrystallization at the low annealing temperature.…”

Section: Influence Of Intercritical Annealing Temperature On the Thermentioning

confidence: 64%

“…It was reported that the hot-rolled or austenitized medium-Mn steels exhibit an elongated morphology after intercritical annealing [8,[36][37][38][39][40][41], inheriting the morphology of martensite. In contrast, the cold-rolled medium-Mn steels usually manifest an equiaxed grain morphology after intercritical annealing [8,37,[40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

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Medium-Mn steels are characterized by ultrafine-grained (UFG) duplex microstructure consisting of ferrite and a large amount of retained austenite. Intercritical annealing is of great importance to achieving the UFG duplex microstructure and adjusting amount as well as stability of retained austenite. In the present work, the influence of intercritical annealing temperature on the microstructure and mechanical properties was investigated in a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C. Particularly, the dependence of microstructural morphology on intercritical annealing temperature was emphasized to reveal the genesis of the microstructural morphology in medium-Mn steels. The ferrite-austenite duplex microstructure manifested an elongated morphology in the specimen annealed at 555 • C, which inherited the lath structure of the cold-rolled state. The medium-Mn steel exhibited a continuous yielding behavior and a relatively low strain-hardening rate. With an increase in intercritical annealing temperature up to 650 • C, the amount of retained austenite increased and microstructure was partially recrystallized, showing a mixture of elongated and equiaxed grain morphologies. When the intercritical annealing was applied at 700 • C, the medium-Mn steel mainly exhibited recrystallized microstructure with equiaxed morphology. The optimal balance between the amount and the stability of retained austenite led to an enhancement of strain hardening and ductility. With a further increase in the intercritical annealing temperature to 750 • C, the medium-Mn steel possessed pronounced strain-hardening behavior at the beginning of the tensile deformation with deteriorated ductility.

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“…Most of the present researches on medium–Mn steels focus on the cold rolled steel sheets, as they can be forming into various parts of automotive. However, we found that the hot rolled medium–Mn steels also exhibited outstanding mechanical properties after IA; thus, they might be also used in the applications like the cross beam in automotive, which generally has a relatively larger thickness. Nevertheless, the hot rolled medium–Mn steels often show relatively low yield strength, which may hinder such kind of application.…”

Section: Introductionmentioning

confidence: 90%

Influence of Nb and V on Microstructure and Mechanical Properties of Hot–Rolled Medium Mn Steels

Zhu

Luo

2017

steel research int.

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In this paper, the authors investigate effects of microalloying elements, including both V and Nb, on the microstructure and mechanical properties of hot–rolled medium–Mn steels. The additions of both V and V + Nb into 9Mn steel can significantly refine the prior austenite grains, which, however, leads to decreased fractions of austenite retained after hot rolling. During the subsequent intercritical annealing (IA) at 670 °C for 5 h, the blocky austenite grains grow coarser, accompanying with the large increment of RA fractions by 30–50%. The additions of both V and V + Nb result in not only finer blocky austenite grains, but also the extensive precipitation of V‐rich carbide in the annealed microstructures, the latter shall be the main contributor to the significant increases of yield strength in 9Mn–V and 9Mn–V–Nb steels. Almost all of the large blocky austenite grains transform to martensite during deformation, leading to significant work hardening via the TRIP effect. As a result, an excellent combination of mechanical properties, including 950 MPa yield strength, 1230 MPa ultimate tensile strength, and 40% total elongation is achieved in the hot rolled and annealed 9Mn–V steel due to both the largest TRIP effect and extensive precipitation of V–containing carbide.

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Microstructure and mechanical properties of hot-rolled medium-Mn steel containing 3% aluminum

Cited by 89 publications

References 38 publications

The Novel Combination of Strength and Ductility in 0.4C‐7Mn‐3.2Al Medium Manganese Steel by Intercritical Annealing

The Novel Combination of Strength and Ductility in 0.4C‐7Mn‐3.2Al Medium Manganese Steel by Intercritical Annealing

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Influence of Nb and V on Microstructure and Mechanical Properties of Hot–Rolled Medium Mn Steels

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