Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Chen, Jun; Lv, Mengyang; Liu, Zhenyu; Wang, Guodong

doi:10.1016/j.msea.2015.09.032

Cited by 62 publications

(27 citation statements)

References 50 publications

(72 reference statements)

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“…The volume fraction of austenite phase in tensile sample with different true strains were exhibited, Figure 7. It illustrates the transformation rate of reversed austenite, which can be well fitted by the exponent decay equation, reported in the previous work [8,17].…”

Section: Stability Of Austenite Phasesupporting

confidence: 70%

“…However, it unfortunately increases the cost and limits the development. Recently, medium manganese steels have been actively studied as advanced high strength-toughness steel that offer reasonable production cost and remarkable mechanical properties [4][5][6][7][8][9][10][11][12][13]. It has potential applications in off-shore steels and other structural components.…”

Section: Introductionmentioning

confidence: 99%

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Effect of prior austenite on reversed austenite stability and mechanical properties of low carbon medium manganese steel heavy plate

Yao

et al. 2019

Materialwissenschaft Werkst

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The effect of prior austenite on reversed austenite stability and mechanical properties of Fe‐0.06C‐0.2Si‐5.5Mn‐0.4Cr (wt.%) annealed steels was elucidated. With the decrease of austenitizing temperature from 1250 °C to 980 °C, the prior austenite changed from complete recrystallization to partial recrystallization, and the average austenite size was reduced. The volume fraction of reversed austenite was increased from 26.32 % to 30.25 % because of high density of grain boundaries and dislocations. The martensite transformation temperature of annealed steels was increased from ∼115 °C to ∼150 °C, and both of thermal and mechanical stability of reversed were reduced. There was no significant different in tensile properties, however, the impact toughness was enhanced from 100 J to 180 J at −60 °C. The excellent impact toughness in annealed steel (austenitized at 980 °C) was obtained because of higher density of high misorientation grain boundaries, more volume fraction of reversed austenite and reduced segregation at grain boundaries.

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Section: Stability Of Austenite Phasesupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Effect of prior austenite on reversed austenite stability and mechanical properties of low carbon medium manganese steel heavy plate

Yao

et al. 2019

Materialwissenschaft Werkst

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“…The austenite phase is enriched with manganese and carbon, which can result in the TRIP effect during deformation contributing to improved ductility and toughness. But, if the austenite phase exceeds a range of about 10 vol.% the local enrichment gets smaller leading to a different stability of the austenite [21][22][23]. Both the larger volume fraction and the smaller stability result in discontinuous TRIP behavior that is reflected by the serrated stress-strain curve.…”

Section: Discussionmentioning

confidence: 99%

Austenite Reversion Tempering-Annealing of 4 wt.% Manganese Steels for Automotive Forging Application

Gramlich

Emmrich

Bleck

2019

Metals

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New medium Mn steels for forged components, in combination with a new heat treatment, are presented. This new annealing process implies air-cooling after forging and austenite reversion tempering (AC + ART). This leads to energy saving compared to other heat treatments, like quenching and tempering (Q + T) or quenching and partitioning (Q + P). Furthermore, the temperature control of AC + ART is easy, which increases the applicability to forged products with large diameters. Laboratory melts distinguished by Ti, B, Mo contents have been casted and consecutively forged into semi-finished products. Mechanical properties and microstructure have been characterized for the AC and the AC + ART states. The as forged-state shows YS from 900 MPa to 1000 MPa, UTS from 1350 MPa to 1500 MPa and impact toughness from 15 J to 25 J. Through the formation of nanostructured retained metastable austenite an increase in impact toughness was achieved with values from 80 J to 100 J dependent on the chemical composition.

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“…The data indicates that with increasing strain, the volume fraction of austenite was decreased. The data was fitted to equation (2) [45].…”

Section: Trip Effect and The Mechanical Stability Of Austenitementioning

confidence: 99%

Interplay between reversed austenite and plastic deformation in a directly quenched and intercritically annealed 0.04C-5Mn low-Al steel

Liu

et al. 2017

Journal of Alloys and Compounds

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We have elucidated here the interplay between reversed austenite and plastic deformation in a directly quenched and intercritically annealed medium-manganese low-Al steel in terms of microstructural evolution and mechanical properties. The ultra-low carbon 5Mn steel was subjected to controlled rolling and direct quenching, followed by intercritical annealing at 630ºC and 650ºC for 30 min, respectively.The directly quenched steel consisted of thin lath-martensite of ~0.2-0.9 μm thickness and ~1.7-2.0% retained austenite with ~50 nm thickness. Intercritical annealing led to a microstructure consisting of alternate sub-micron laminated structure of tempered martensite and reversed austenite. With increase in annealing temperature from 630ºC to 650ºC, the volume fraction of austenite was increased from 12.6% to 19.1% at 1/4 thickness (t/4), and from 8.4% to 12.7% at 1/2 thickness (t/2). The yield strength, tensile strength, and elongation of 728 MPa, 826 MPa, and 25.5%, were obtained at t/4 of the plate, and 714 MPa, 814 MPa, and 24.2% at t/2, on annealing at 630ºC. The impact energy obtained at -60ºC was greater than 80 J. When the annealing temperature was increased to 650ºC, strength was marginally decreased, but toughness was significantly increased to more than 110 J. Extremely small variation in microstructure and mechanical properties at t/4 and t/2 plate thickness were observed. Energy dispersive x-ray spectroscopy (EDS) confirmed ~7.2-10.1 wt.% Mn enrichment in reversed austenite during annealing, which is of significance in stabilization of reversed austenite. Work hardening behavior and tensile experiments were conducted to study the effect of reversed austenite during plastic deformation. With increased annealing temperature, the stability of reversed austenite was decreased because of less enrichment of C and Mn in reversed austenite and grain growth. At 0.05 tensile strain, reversed austenite improved weldability [5,7]. Currently used low alloy heavy plate steels for high-strength structural applications are essentially quenched and tempered steels with low-to medium-carbon content [8].Generally expensive alloying elements, such as Ni, Cr, Cu, and Mo, are added to obtain required high strength in the mid-thickness of the plate to improve the microstructure, mechanical properties and homogeneity. Furthermore, the traditional high-strength structural steels adopt multi-stage heat treatment process, which consumes significant energy and is against the concept of green economy.Mn is an important alloying element in the design of advanced high-strength steels, because it increases the stability of austenite and also impacts the kinetics of transformation [9-10]. In recent years, a number of studies have been carried out on low-carbon medium-manganese steels to explore new possibilities in the development of advanced high-strength steels [11][12][13][14][15]. It is known that BCC bainite/martensite transforms to FCC austenite during intercritical annealing in the two-phase region, referred as austenite revert...

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Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Cited by 62 publications

References 50 publications

Effect of prior austenite on reversed austenite stability and mechanical properties of low carbon medium manganese steel heavy plate

Effect of prior austenite on reversed austenite stability and mechanical properties of low carbon medium manganese steel heavy plate

Austenite Reversion Tempering-Annealing of 4 wt.% Manganese Steels for Automotive Forging Application

Interplay between reversed austenite and plastic deformation in a directly quenched and intercritically annealed 0.04C-5Mn low-Al steel

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