Microstructure and Mechanical Properties of a Cold-Rolled Medium Manganese Steel with Delta Ferrite

Hu, Zhi; Xu, Yun Bo; Tan, Xiang-Yang; Xiao, Yang; Yu, Yong

doi:10.4028/www.scientific.net/msf.816.750

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…During the tensile deformation process, the martensitic transformation caused by the TRIP effect contributes to the enhancement in local strength, which is difficult to deform continuously. The deformation transform to other parts of the phase, delaying the formation of necking, reinforcing the elongation [15,16], the combination of the two makes the highest elongation at holding 2 h.…”

Section: Resultsmentioning

confidence: 99%

Effect of a two-phase region annealing process on microstructure and mechanical properties of medium manganese steel

Fan

Zhao

et al. 2019

Ironmaking & Steelmaking

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In order to develop third-generation automobile steel with perfect tensile strength and elongation, cold-rolled medium manganese steel was annealed in a two-phase region using a hightemperature tube atmosphere annealing furnace. The microstructure evolution and mechanical properties of 0.13% C-5.4% Mn low-carbon cold-rolled medium manganese steel in different annealing temperatures as well as different annealing times were investigated by means of scanning electron microscopy, transmission electron microscope and X-Ray Diffraction. The results indicated that the main microstructure after annealing was ultra-fine grained ferrite, austenite and martensite. Annealing temperature of the two-phase region was between 625°C and 700°C; the highest content of austenite was 20.23% at 675°C. The annealed time increased from 10 min to 2 h. With the extension of annealing time, the austenite volume fraction decreased first and then increased, which was 20.20% and 20.23% at 10 min and 2 h, respectively. The optimum comprehensive mechanical properties were obtained at 675°C for 2 h. The tensile strength was 900 MPa, the elongation was 25%, and the tensile strength and elongation reached 22.4 GPa%.

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Section: Resultsmentioning

confidence: 99%

Effect of a two-phase region annealing process on microstructure and mechanical properties of medium manganese steel

Fan

Zhao

et al. 2019

Ironmaking & Steelmaking

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“…With lower costs and good workmanship, the development of high-strength steel with excellent plasticity has become a goal in the field of automotive steel sheets. As one of the most promising candidates for the third generation of advanced high-strength steel, medium-manganese steel has attracted considerable attention from scholars worldwide [1]. Their excellent mechanical properties depend on the large volume fraction of retained austenite and the phase transformation-induced plasticity (TRIP) effect during deformation [2–4].…”

Section: Introductionmentioning

confidence: 99%

Effect of retained austenite on the microstructure and mechanical properties of cold-rolled medium-manganese Q&P steel

Feng

Jing

Lin

et al. 2022

Ironmaking & Steelmaking

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The effect of retained austenite stability on microstructure evolution and mechanical properties of a new cold-rolled medium-manganese steel (0.12C, 7.69Mn, 1.45Si, 2.76Al wt-%) under intercritical annealing Q&P process at different partitioning temperatures was investigated. The evolution of retained austenite was characterized and statistically analysed using SEM, TEM, EBSD, and XRD techniques. The results show that the stability of retained austenite depends to a large extent on the applied heat treatment and is mainly attributed to the retained austenite content and morphology, whose carbon content is not the main influence. More retained austenite content and the formation of heterogeneous austenite structures (granular, massive, lamellar) are observed at a partitioning temperature of 150°C. The retained austenite of different morphologies has different stabilities and can sustain the TRIP effect at different strain stages, obtaining the best comprehensive mechanical properties with 34.5% elongation and the product of tensile strength and elongation is up to 43.5 GPa•%.

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“…Under the action of deformation, the dual‐phase composed of δ‐ferrite and austenite is expected to be elongated and forms micro‐laminated microstructure. [ 5–17 ]…”

Section: Introductionmentioning

confidence: 99%

“…Except prior δ‐ferrite lamellae, through diversified alloy design, hot working process, and heat treatment process, the microstructure transformed from prior austenite can be designed as dual‐phase or multiphase constituents, containing austenite, [ 5–10,12–14 ] α‐ferrite, [ 5–8,12 ] martensite, [ 5–13 ] pearlite, [ 10 ] and bainite, [ 10 ] and the fraction range of each phase is also wide. Accordingly, the mechanical properties also vary among different phases.…”

Section: Introductionmentioning

confidence: 99%

“…Under the action of deformation, the dualphase composed of δ-ferrite and austenite is expected to be elongated and forms micro-laminated microstructure. [5][6][7][8][9][10][11][12][13][14][15][16][17] Except prior δ-ferrite lamellae, through diversified alloy design, hot working process, and heat treatment process, the microstructure transformed from prior austenite can be designed as dual-phase or multiphase constituents, containing austenite, [5][6][7][8][9][10][12][13][14] α-ferrite, [5][6][7][8]12] martensite, [5][6][7][8][9][10][11][12][13] pearlite, [10] and bainite, [10] and the fraction range of each phase is also wide. Accordingly, the mechanical properties also vary among different phases.…”

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confidence: 99%

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Strain‐Associated Alpha‐Ferrite Phase Transformation in a Micro‐Laminated Low‐Density Steel

Liú

Shang

et al. 2022

steel research int.

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Aluminum-alloyed low-density steels have recently received significant attention because of the advantage in strength-todensity ratio [1] and superior corrosion resistance. [2][3][4] Aluminum is a strong ferrite-forming element and expands both α-ferrite and δ-ferrite phase region. Thus, the addition of aluminum in steel can result in δ-ferrite that always exists below solidification temperature, in spite of the addition of austenitic stabilizing elements. Under the action of deformation, the dualphase composed of δ-ferrite and austenite is expected to be elongated and forms micro-laminated microstructure. [5][6][7][8][9][10][11][12][13][14][15][16][17] Except prior δ-ferrite lamellae, through diversified alloy design, hot working process, and heat treatment process, the microstructure transformed from prior austenite can be designed as dual-phase or multiphase constituents, containing austenite, [5][6][7][8][9][10][12][13][14] α-ferrite, [5][6][7][8]12] martensite, [5][6][7][8][9][10][11][12][13] pearlite, [10] and bainite, [10] and the fraction range of each phase is also wide. Accordingly, the mechanical properties also vary among different phases. Hence, micro-laminated low-density steels have a broad application prospect, with extraordinary combinations of mechanical properties. [8,[10][11][12][13] Based on the microstructure, the deformation-induced evolution of the microstructure and the fracture mechanism are also complex. In general, δ-ferrite is a brittle phase, while the complex microstructure transformed from the original austenite has superior plasticity and resistance to crack growth. [17,18] Cracks propagate preferably into δ-ferrite or at the interface l ayer along the δ-ferrite {100} planes. [15,18] The embrittlement of δ-ferrite is because of higher aluminum content. [17][18][19] With the increase of aluminum content, the reduced mobility of dislocations [19,20] and the formation of ordered structure [17][18][19] result in lower ductility and toughness. Given that the retained austenite stability is critical for fracture resistance, [17] previous studies have focused on controlling the content and stability of retained austenite.However, studies on α-ferrite phase transformation on δ-ferrite and corresponding effect on mechanical properties are rare. Li et al. [14] reported that coarse δ-ferrite is harmful to mechanical properties. The grain refinement of ferrite is simultaneously beneficial to both strength and toughness.

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Microstructure and Mechanical Properties of a Cold-Rolled Medium Manganese Steel with Delta Ferrite

Cited by 8 publications

References 8 publications

Effect of a two-phase region annealing process on microstructure and mechanical properties of medium manganese steel

Effect of a two-phase region annealing process on microstructure and mechanical properties of medium manganese steel

Effect of retained austenite on the microstructure and mechanical properties of cold-rolled medium-manganese Q&P steel

Strain‐Associated Alpha‐Ferrite Phase Transformation in a Micro‐Laminated Low‐Density Steel

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