Microstructure and tensile behavior of Fe-8Mn-6Al-0.2C low density steel

Li, Xuan; Song, Ren‐Jie; Zhou, Naipeng; Li, Jiajia

doi:10.1016/j.msea.2017.10.039

Cited by 29 publications

(10 citation statements)

References 30 publications

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“…Ferrite-based duplex steels contain medium Mn content (3-10 wt.%), Al content of 5-9 wt.% and low C content (< 0.4 wt.%). 10,44,48) These steels are characterized by a complex bimodal banded structure of δ-ferrite and austenite bands elongated along the rolling direction, Fig. 6(a).…”

Section: Duplex Fe-mnmentioning

confidence: 99%

“…Figure 7 plots the tensile elongation (TE) vs. ultimate tensile strength (UTS) diagram at room temperature for several types of Fe-Mn-Al-C steels. 2,3,5,6,[8][9][10][11][12]21,23,24,26,32,33,38,[43][44][45][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] The plot includes the tensile properties of conventional high strength steels for comparison. In particular, Fig.…”

Section: Room-temperature Mechanical Propertiesmentioning

confidence: 99%

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Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties

Gutiérrez-Urrutia

2021

ISIJ Int.

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This review introduces the structural phases, microstructural characteristics, and the most relevant room and cryogenic properties of low density Fe-Mn-Al-C steels. The combination of outstanding physical and mechanical properties while offering a weight reduction of up to 18% make low density Fe-Mn-Al-C steels attractive structural materials as lightweight crash-resistant car body structures and structural components in the cryogenic industry. In this review, the latest alloy design strategies are introduced. In particular, the novel aspects of the phase structures and their deformation behavior, in particular, those related to L'1 2 (Fe, Mn) 3 AlC carbides (κ-carbides) and B2-type Ni/Cu-rich precipitates, are critically summarized. Future scientific and technical challenges are provided to establish these steels as structural materials for industrial applications.

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Section: Duplex Fe-mnmentioning

confidence: 99%

Section: Room-temperature Mechanical Propertiesmentioning

confidence: 99%

Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties

Gutiérrez-Urrutia

2021

ISIJ Int.

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“…The Schmid factor of the grain relates to the ease of plastic deformation. The grain with low Schmid factor is adverse to plastically deform assisting by dislocation slip because the low Schmid factor always leads to a low resolved shear stress in the specific slip system [18,19]. By contrast, the grain with high Schmid factor can easily deform.…”

Section: Cross-sectional Surface Of the Fracturementioning

confidence: 99%

Enhancement of Strength–Ductility Balance of the Laser Melting Deposited 12CrNi2 Alloy Steel Via Multi-step Quenching Treatment

Zhang

Dong

Kang

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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A ferrite-austenite 12CrNi2 alloy steel additively manufactured by laser melting deposition (LMD) was heat treated by direct quenching (DQ) and tempering inter-critical quenching (TIQ) at 800 °C for enhancing its strength-ductility balance. Both heat-treated alloy steels have the martensite-ferrite dual-phase (DP) microstructures. The volume fractions of martensite in the two treated alloy steels are nearly similar (~ 85 vol%), while the sizes of the prior austenitic grain for martensite are different. The martensite-dominated DP microstructure resulted in an obvious improvement in strength-ductility balance of the alloy steel. Compared with the DQ treatment, the multi-step TIQ treatment caused the strength-ductility balance of the alloy steel to be enhanced due to its higher total elongation. The better ductility of the TIQ-treated alloy steel can be attributed to the optimization of the microstructure. The preferred orientation of ferritic grain in the as-deposited alloy steel which was adverse to plastic deformation through dislocation slip was eliminated via the multi-step TIQ treatment. Moreover, the TIQ treatment promoted the formation of finer-grained martensite with larger areas of grain boundaries and twinning boundaries which resulted in the enhancement of the coordinated deformability of the martensite with the ferrite.

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“…This steel group contains manganese ranging between 3 and 10 wt%, aluminum ranging from 5 to 9 wt%, and carbon less than 0.4 wt%. [ 1–3 ] The decrease in density strongly depends on the aluminum content, that is, ≈1.3% reduction in density per 1 wt% addition of aluminum. [ 4 ] The duplex microstructure is designed by balancing the ferrite and austenite formers.…”

Section: Introductionmentioning

confidence: 99%

“…However, only very few research groups have studied this for forged products. [ 10,11 ] This paper focusses on the ferrite‐based duplex group of the medium‐manganese steel with a slightly different chemical composition from those published in the literature, [ 1–3,7,12 ] lying at the boundary of the group. Its higher manganese content (>6 wt%) is to avoid the formation of coarse κ‐carbide at forging temperatures and to stabilize the retained austenite during air‐cooling.…”

Section: Introductionmentioning

confidence: 99%

Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

Dickert

Suwanpinij

Bleck

2022

steel research int.

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Herein, the opportunity of lightweight medium‐manganese steel Fe‐7Mn‐6Al‐0.3C for forged components produced without quenching and tempering treatments is explored. The selected composition reveals neither cracks nor intergranular coarse κ‐carbide and has a lower density than pure iron by 9%. Despite the massive dimension of the forged bar and decreased thermal conductivity, outstanding mechanical properties can be achieved by air‐cooling followed by intercritical annealing. An intermediate tensile strength of 685 MPa with total elongation of 29% can be achieved by annealing at 800 °C for 1,000 s, whereas an ultimate tensile strength above 1,000 MPa with an elongation of 13% can be reached by forming tempered martensite with fine κ‐carbide at 400 °C.

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Microstructure and tensile behavior of Fe-8Mn-6Al-0.2C low density steel

Cited by 29 publications

References 30 publications

Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties

Low Density Fe–Mn–Al–C Steels: Phase Structures, Mechanisms and Properties

Enhancement of Strength–Ductility Balance of the Laser Melting Deposited 12CrNi2 Alloy Steel Via Multi-step Quenching Treatment

Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

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