Microstructure and tensile properties of a 0.20C<b>–</b>4.86Mn steel after short intercritical-annealing times

Li, Yan; Huyan, Fei; Ding, Wei

doi:10.1080/02670836.2018.1550864

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Martensite transformation occurred in A740-A755 steels, while no martensite transformation was observed in A680-A725 steels. These results indicated that thermal stability of intercritical austenite is significantly influenced by IA temperature, which is similar to the result in previous medium-Mn steels, such as in cold-rolled Fe-0.3C-6Mn steel [26], Fe-0.20C-4.86Mn steel [27] and Fe-0.05C-12Mn-3Al steel [28]. Different IA temperature results in different concentration of alloying elements in the intercritical austenite due to elemental partitioning between intercritical austenite and ferrite [29,30].…”

Section: Thermal Stability Of Intercritical Austenitesupporting

confidence: 89%

A medium-Mn steel processed by novel twin-roll strip casting route

Wang

Zhang

Ran

et al. 2019

Materials Science and Technology

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A medium-Mn steel (Fe–0.3C–4Mn–1.82Al–0.6Si wt-%) was produced by a novel processing route involving twin-roll strip casting, hot rolling and intercritical annealing (IA). Macrosegregation was absent in the as-cast strip. The microstructure of the as-cast strip consisted of martensite and austenite (∼10 vol.-%), and the solidification structure was characterised by dendritic structure. With an increase in IA temperature from 680 to 725 and to 755°C, austenite fraction in intercritically annealed steels was increased from 22 to 45% and then decreased to 27%. The 710°C intercritically annealed steel yielded excellent mechanical properties with a tensile strength of ∼1007 MPa and total elongation of ∼48%, achieved by a high volume fraction of austenite (∼42%) with appropriate mechanical stability.

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Section: Thermal Stability Of Intercritical Austenitesupporting

confidence: 89%

A medium-Mn steel processed by novel twin-roll strip casting route

Wang

Zhang

Ran

et al. 2019

Materials Science and Technology

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“…Considering weldability, the content of Carbon (C) used in the steel sheets kept under scrutiny lies in the range of low-carbon steels [30]. A typical Mn content for medium Mn steels [3] has also been considered in this experiment. Cr and B have been added to improve the hardenability and strength [31], and Si (1 wt-%) was added to provide appropriate final surface conditions by applying surface processes [1].…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, medium Mn steels (3-10 wt-% Mn) have been considered new candidates for the third-generation advanced high-strength steels (AHSSs) [1][2][3][4][5]. Weight reduction [6][7][8], fuel efficiency [9], passengers' safety [10,11] and greenhouse gas emission reduction [12] are desired outcomes for the automotive industry, which can be achieved by improving the mechanical properties of the AHSSs [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical properties of medium Mn advanced high-strength steel by inter-critical annealing: elimination of austenizing and quenching steps

Zabihi-Gargari

Shahverdi

Emami

et al. 2019

Ironmaking & Steelmaking

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Here, hardenability was enhanced by choosing two different chemical compositions, i.e. the addition of boron (0.12 wt-%) and chromium (2.5 wt-%) to the ordinary composition of the medium Mn advanced high-strength steels (AHSSs). Carbo-boride precipitates were formed in the samples having both boron and carbon in their compositions. Martensite was tempered after intercritical annealing at 700°C. In the alloy with both boron and carbon (A2 alloy), austenite was formed by 2.8 vol.-% after 10-min annealing. Primarily, the annealing process led to the austenite stabilization in the structure of the cold-rolled A2 alloy due to the dissolution of carbo-boride precipitates. For the carbon-free alloy (A1 alloy), on the other, the annealing process and subsequent dissolution of precipitates failed to create austenite stabilization. The resulting mechanical properties for the coldrolled A2 alloy are ultimate tensile stress of 1029 MPa, total elongation per cent of 19.5 and formability index of 20 GPa%.

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“…Moreover, Al increases the temperature range for intercritical annealing to higher temperatures [ 34 ]. This allows the annealing time to be reduced by enhancing the Mn diffusion without decreasing the stability of the retained austenite otherwise detectable at higher annealing temperatures [ 31 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Adjustment of Mechanical Properties of Medium Manganese Steel Produced by Laser Powder Bed Fusion with a Subsequent Heat Treatment

et al. 2021

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Medium manganese steels can exhibit both high strength and ductility due to transformation-induced plasticity (TRIP), caused by metastable retained austenite, which in turn can be adjusted by intercritical annealing. This study addresses the laser additive processability and mechanical properties of the third-generation advanced high strength steels (AHSS) on the basis of medium manganese steel using Laser Powder Bed Fusion (LPBF). For the investigations, an alloy with a manganese concentration of 5 wt.% was gas atomized and processed by LPBF. Intercritical annealing was subsequently performed at different temperatures (630 and 770 °C) and three annealing times (3, 10 and 60 min) to adjust the stability of the retained austenite. Higher annealing temperatures lead to lower yield strength but an increase in tensile strength due to a stronger work-hardening. The maximum elongation at fracture was approximately in the middle of the examined temperature field. The microstructure and properties of the alloy were further investigated by scanning electron microscopy (SEM), hardness measurements, X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and element mapping.

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Microstructure and tensile properties of a 0.20C–4.86Mn steel after short intercritical-annealing times

Cited by 13 publications

References 28 publications

A medium-Mn steel processed by novel twin-roll strip casting route

A medium-Mn steel processed by novel twin-roll strip casting route

Enhancing mechanical properties of medium Mn advanced high-strength steel by inter-critical annealing: elimination of austenizing and quenching steps

Adjustment of Mechanical Properties of Medium Manganese Steel Produced by Laser Powder Bed Fusion with a Subsequent Heat Treatment

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