The size effect of initial martensite constituents on the microstructure and tensile properties of intercritically annealed Fe–9Mn–0.05C steel

Han, Jeongho; Lee, Seung Joon; Lee, Chan Young; Lee, Suk Jin; Jo, Seo Yeon; Lee, Young Kook

doi:10.1016/j.msea.2015.02.075

Cited by 65 publications

(52 citation statements)

References 22 publications

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“…Extensive research has focused on the influence of intercritical annealing parameters (intercritical annealing temperature [9,[25][26][27][28], intercritical annealing time [11,29], austenitization temperature [30,31], and heating rate in intercritical annealing [32] etc.) on microstructure and mechanical properties of medium-Mn steels.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

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Medium-Mn steels are characterized by ultrafine-grained (UFG) duplex microstructure consisting of ferrite and a large amount of retained austenite. Intercritical annealing is of great importance to achieving the UFG duplex microstructure and adjusting amount as well as stability of retained austenite. In the present work, the influence of intercritical annealing temperature on the microstructure and mechanical properties was investigated in a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C. Particularly, the dependence of microstructural morphology on intercritical annealing temperature was emphasized to reveal the genesis of the microstructural morphology in medium-Mn steels. The ferrite-austenite duplex microstructure manifested an elongated morphology in the specimen annealed at 555 • C, which inherited the lath structure of the cold-rolled state. The medium-Mn steel exhibited a continuous yielding behavior and a relatively low strain-hardening rate. With an increase in intercritical annealing temperature up to 650 • C, the amount of retained austenite increased and microstructure was partially recrystallized, showing a mixture of elongated and equiaxed grain morphologies. When the intercritical annealing was applied at 700 • C, the medium-Mn steel mainly exhibited recrystallized microstructure with equiaxed morphology. The optimal balance between the amount and the stability of retained austenite led to an enhancement of strain hardening and ductility. With a further increase in the intercritical annealing temperature to 750 • C, the medium-Mn steel possessed pronounced strain-hardening behavior at the beginning of the tensile deformation with deteriorated ductility.

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Section: Introductionmentioning

confidence: 99%

“…Besides, it was found that the austenitization temperature has a strong influence on the morphology of quenched martensite [30,31]. This directly affected the austenite reverted transformation, such as the austenite volume fraction, transformation rate and grain size [30,31].…”

Section: Introductionmentioning

confidence: 99%

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

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“…All the second-annealed specimens exhibited bimodal-grained structures with coarse a G and ultrafine lathshaped a (a L ) and g R (g L ). Both the fine a L and g L formed by a diffusive reverse transformation from athermal a 0 martensite to g at the block boundaries prior to the recrystallization of a 0 martensite [2,16]. The relatively large a G came from a G pre-existing in the first-annealed specimen.…”

Section: Resultsmentioning

confidence: 99%

“…3aed). Based on our previous results [2,16] and Kikuchi patterns (Fig. 3e), dark pits and gray flat regions are considered to be g R and a, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…2b shows the changes in sizes of a G and the constituents of a 0 martensite with annealing time at 660 C in the first-annealed specimens. The sizes of a 0 martensite constituents, such as prior g grains and the packets and blocks of a 0 martensite, were measured by a linear intercept method using the IQ-phase maps[16]. The average diameter of a G increased from 1.07 mm for the 4 h annealed specimen to 1.87 mm for the 22 h annealed specimen.…”

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confidence: 99%

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Fabrication of bimodal-grained Al-free medium Mn steel by double intercritical annealing and its tensile properties

Han

Kang

Lee

et al. 2016

Journal of Alloys and Compounds

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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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The size effect of initial martensite constituents on the microstructure and tensile properties of intercritically annealed Fe–9Mn–0.05C steel

Cited by 65 publications

References 22 publications

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Fabrication of bimodal-grained Al-free medium Mn steel by double intercritical annealing and its tensile properties

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

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