Microstructure and mechanical properties of a novel hot-rolled 4% Mn steel processed by intercritical annealing

Wang, He-song; Yuan, Guo; Lan, Meng-Fei; Kang, Jian; Zhang, Yuanxiang; Cao, Guangming; Misra, R.D.K.; Wang, Guodong

doi:10.1007/s10853-018-2512-0

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…the variation of PSE was not in accordance with the variation of austenite fraction. Thus, optimum mechanical properties of A680–A755 steels were not only related to austenite fraction but were also related to the mechanical stability of austenite, which is similar to the result in previous studies [40,41]. First, the value of A680 steel shown in Figure 14 indicated that the mechanical stability of austenite was relatively stable, such that only small content of austenite transformed to martensite during tensile deformation (Figure 10).…”

Section: Discussionsupporting

confidence: 87%

A medium-Mn steel processed by novel twin-roll strip casting route

Wang

Zhang

Ran

et al. 2019

Materials Science and Technology

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A medium-Mn steel (Fe–0.3C–4Mn–1.82Al–0.6Si wt-%) was produced by a novel processing route involving twin-roll strip casting, hot rolling and intercritical annealing (IA). Macrosegregation was absent in the as-cast strip. The microstructure of the as-cast strip consisted of martensite and austenite (∼10 vol.-%), and the solidification structure was characterised by dendritic structure. With an increase in IA temperature from 680 to 725 and to 755°C, austenite fraction in intercritically annealed steels was increased from 22 to 45% and then decreased to 27%. The 710°C intercritically annealed steel yielded excellent mechanical properties with a tensile strength of ∼1007 MPa and total elongation of ∼48%, achieved by a high volume fraction of austenite (∼42%) with appropriate mechanical stability.

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Section: Discussionsupporting

confidence: 87%

A medium-Mn steel processed by novel twin-roll strip casting route

Wang

Zhang

Ran

et al. 2019

Materials Science and Technology

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“…Advanced high strength steels (AHSSs) combining high strength and large ductility are oriented to be primarily used in automotive industries with aims of weightsaving to improve fuel efficiency and enhanced passengers' safety. Owing to strong demands of high-strength steels, tremendous research efforts have been put into the development of AHSSs and various achievements have been acquired since 1980s [1][2][3]. AHSSs are generally classified into three generations [4].…”

Section: Introductionmentioning

confidence: 99%

“…One performs intercritical annealing starting from low-temperature microstructure (martensite in most medium-Mn steels), where Mn partitioning occurs to stabilise Mn enriched austenite at room temperature [18]. Recent researches have been mainly focusing on this route for obtaining large amounts of retained austenite to realise better mechanical properties by TRIP effect [3,4,[19][20][21]. On the other hand, the second route of thermomechanical processing starting from austenite is more realistic than the first route from a practical viewpoint, since conventional facility in steel industries can be adopted.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution during thermomechanical processing in 3Mn-0.1C medium-Mn steel

Hou

Bai

Shibata

et al. 2019

Materials Science and Technology

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Medium-Mn steels are energetically investigated as a candidate of the third generation advanced high strength steels (AHSSs). However, their phase transformation and microstructaure evolution during various heat treatments and thermomechanical processing are still unclear. The present study first confirmed the kinetics of static phase transformation behaviour in a 3Mn-0.1C medium-Mn steel. Hot compression tests were also carried out to investigate the influence of high-temperature deformation of austenite on subsequent microstructure evolution. It was found that static ferrite transformation was quite slow in this steel, but ferrite transformation was greatly accelerated by the hot deformation in austenite and ferrite two-phase regions. Characteristic dual-phase microstructures composed of martensite and fine-grained ferrite were obtained, which exhibited superior mechanical properties. This paper is part of a Thematic Issue on Medium Manganese Steels.

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“…The relatively low Mn content not only reduces the manufacturing costs, but also is beneficial to solve the problems during industrial production, such as decreasing thermal conductivity of continuous casting slabs and reducing Mn segregation during solidification. [26,27] The effects of intercritical temperatures on the microstructure, tensile properties, and three-point bending behaviors were investigated in detail. The relationships between the microstructure and properties were systematically discussed.…”

Section: Introductionmentioning

confidence: 99%

A Hot‐Stamped Medium‐Mn Steel with Superior Strength–Ductility–Bendability Combination and Thin Oxidation Layer

Wang,

Yan,

Chang

2024

steel research int.

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A hot‐stamped medium‐Mn steel containing 3.84 wt% Mn is designed for the manufacture of hot‐stamped automotive components. The effects of intercritical temperatures employed for hot forming on the microstructure, tensile properties, and three‐point bending behaviors are investigated. The result shows that the microstructure can be controlled by intercritical temperatures, leading to different phase fractions of martensite, retained austenite, and ferrite in the steels. Besides, the tensile strength increases with increasing intercritical temperature, while both the total elongation and the bending angle show reverse change trend, which are related to the various phase fractions and the different transformation‐induced plasticity effects during deformation. Importantly, the medium‐Mn steel subjected to heat treatment at 800 °C possesses tensile strength of 1535 MPa, total elongation of 13.8%, and bending angle of ≈56°. Therefore, its total elongation is significantly higher than hot‐stamped 22MnB5 steel under the same tensile strength grade, and the bending angle of the former is close to the latter. Moreover, the thickness of oxidation layer on the medium‐Mn steel is only ≈3.5 μm after heat treatment at 800 °C, much thinner than the ≈57 μm‐thick oxidation layer on the 22MnB5 steel after austenitizing at 930 °C.

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Microstructure and mechanical properties of a novel hot-rolled 4% Mn steel processed by intercritical annealing

Cited by 14 publications

References 33 publications

A medium-Mn steel processed by novel twin-roll strip casting route

A medium-Mn steel processed by novel twin-roll strip casting route

Microstructure evolution during thermomechanical processing in 3Mn-0.1C medium-Mn steel

A Hot‐Stamped Medium‐Mn Steel with Superior Strength–Ductility–Bendability Combination and Thin Oxidation Layer

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