Microstructure and mechanical properties of a Fe–28Mn–9Al-1.2C-(0, 3, 6, 9)Cr austenitic low-density steel

Liu, Yuxiang; Liu, Mingxiang; Zhang, Jianlei; He, Wei; Luo, Zhiping; Song, Changjiang; Zhai, Qijie

doi:10.1016/j.msea.2021.141583

Cited by 15 publications

(4 citation statements)

References 43 publications

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“…On the other hand, some Crbearing carbides, such as Cr 23 C 6 and Cr 7 C 3 , were observed in austenite of a Fe-8.7Al-28.3Mn-1C-5.5Cr (wt%) steel after aging treatment in a board temperature range [24]. Our previous work [21] has found that the Cr 23 C 6 carbides could precipitate in Fe-28Mn-9Al-1.2C-9Cr (wt%) low-density steel, and significantly increased the tensile strength of the steel. In addition, K.W.…”

Section: Introductionmentioning

confidence: 90%

“…The addition of Cr in the low-density steels has been expected to obtain excellent comprehensive mechanical properties with high strength and good plasticity [15,19,20]. On the one hand, the Cr addition was found to suppress the precipitation and growth of intragranular κ-carbide in austenite, which decreased the yield strength [15,21]. At the same time, the Cr addition has been proved to suppress the formation of coarse κ-carbides along grain boundaries favoring good plasticity [22] and promote the formation of DO3 phase in austenite [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-Density Steels During Isothermal Aging

Zhang

Jiang

et al. 2022

Met. Mater. Int.

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The influence of Cr on the microstructural evolution of austenite in Fe-20Mn-9Al-1.2C-xCr (wt%, x = 0, 3 and 6) low-density steels during isothermal aging at 650 °C for various durations was systematically investigated. With the isothermal aging processed, the 0Cr and 3Cr samples underwent the divorced eutectoid transformation followed by the eutectoid transformation, while only the eutectoid transformation was observed in the 6Cr sample. Meanwhile, increasing Cr content changed the eutectoid transformation products from ferrite + κ-carbide in the 0Cr sample to ferrite + κ-carbide + M 23 C 6 carbide in the 3Cr sample, and to ferrite + M 7 C 3 carbide in the 6Cr sample. The Cr addition significantly increased the A1 temperature (655 °C) of the 0Cr sample to 712 °C of the 3Cr sample, and to 841 °C of the 6Cr sample. As a result, the temperature difference between the A1 temperature and experimental phase transformation temperature (650 °C) was enlarged, which provided a greater driving force for the eutectoid transformation and accelerated the transformation rate of eutectoid transformation. In addition, the Cr addition had a significant effect on the diffusion of constituent elements, decreased the interlayer spacing of pearlite structure from 625 ± 30 nm in the 0Cr sample to 385 ± 25 nm in the 3Cr sample, and to 150 ± 20 nm in the 6Cr sample, refining the eutectoid structure. These findings revealed the mechanism regarding the effect of Cr addition on the eutectoid transformation of austenite, offering valuable insights into the microstructure design of high-performance lowdensity steels.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-Density Steels During Isothermal Aging

Zhang

Jiang

et al. 2022

Met. Mater. Int.

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“…The mechanical properties of the representative medium-Mn [38,[40][41][42]45,46,50,51,[53][54][55]84] and high-Mn [3,18,57,58,63,67,69,78,79,83,85,91,100,103,107,[109][110][111]113,116,122,124,127,129,[141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Austenite-Based Fe-Mn-Al-C Lightweight Steels: Research and Prospective

Ding

Liu

Cai

2022

Metals

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Fe-Mn-Al-C lightweight steels have been investigated intensely in the last a few years. There are basically four types of Fe-Mn-Al-C steels, ferritic, ferrite-based duplex/triplex (ferrite + austenite, ferrite + austenite + martensite), austenite-based duplex (ferrite + austenite), and single-austenitic. Among these steels, austenite-based lightweight steels generally exhibit high strength, good ductility, and outstanding weight reduction effects. Due to the addition of Al and high C content, κ’-carbide and κ-carbide are prone to form in the austenite grain interior and at grain boundaries of lightweight steels, respectively, and play critical roles in controlling the microstructures and mechanical properties of the steels. The microstructural evolution, strengthening mechanisms, and deformation behaviors of these lightweight steels are quite different from those of the mild conventional steels and TRIP/TWIP steels due to their high stacking fault energies. The relationship between the microstructures and mechanical properties has been widely investigated, and several deformation mechanisms have also been proposed for austenite-based lightweight steels. In this paper, the current research works are reviewed and the prospectives of the austenite-based Fe-Mn-Al-C lightweight steels are discussed.

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“…

Owing to the demand for energy saving and consumption reduction, austenite-based Fe-Mn-Al-C steel with lowdensity and excellent mechanical properties has been attracting a lot of attention [1][2][3][4][5] . In this low-density steel, precipitation strengthening by nano-scale intragranular κ-carbides is an important method to increase the yield strength [6][7][8][9][10] , but the ductility would be significantly reduced if coarse κ-carbides are formed at grain boundaries [11][12][13] .

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confidence: 99%

An accelerated aging assisted by electric current in a Fe-Mn-Al-C low-density steel

et al. 2022

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Microstructure and mechanical properties of a Fe–28Mn–9Al-1.2C-(0, 3, 6, 9)Cr austenitic low-density steel

Cited by 15 publications

References 43 publications

Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-Density Steels During Isothermal Aging

Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-Density Steels During Isothermal Aging

Austenite-Based Fe-Mn-Al-C Lightweight Steels: Research and Prospective

An accelerated aging assisted by electric current in a Fe-Mn-Al-C low-density steel

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