Improvement of tensile properties in (austenite+ferrite+κ-carbide) triplex hot-rolled lightweight steels

Song, Hyejin; Kwon, Yong Bum; Sohn, Seok Su; Koo, Minseo; Kim, Nack J.; Lee, Byeong-Joo; Lee, Sunghak

doi:10.1016/j.msea.2018.06.003

Cited by 28 publications

(14 citation statements)

References 36 publications

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“…[24] Although Al can significantly reduce the density of steel, [25] Al content was chosen to be kept below 4À5 wt pct as Al is known to clog continuous casting nozzles [26] and form brittle j-carbides in medium Mn steels when added in excessive amounts. [25,27] V can also be added for carbide formation and precipitation strengthening [14,28] but its content should ideally be kept below 0.2 wt pct to minimise the alloying cost of the steel. Lastly, even though Sn is a known tramp element in steel, [29] 0.05 wt pct Sn was deliberately added to potentially improve the galvanisability of the steel.…”

Section: A Alloying Conceptmentioning

confidence: 99%

Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel

Kwok

Gong

et al. 2021

Metall Mater Trans A

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A novel medium manganese steel with composition Fe–8.3Mn–3.8Al–1.8Si–0.5C–0.06V–0.05Sn was developed and thermomechanically processed through hot rolling and intercritical annealing. The steel possessed a yield strength of 1 GPa, tensile strength of 1.13 GPa and ductility of 41 pct. In order to study the effect of cold rolling after intercritical annealing on subsequent tensile properties, the steel was further cold rolled up to 20 pct reduction. After cold rolling, it was observed that the strain hardening rate increased continuously with increasing cold rolling reduction but without a significant drop in ductility during subsequent tensile tests. The microstructural evolution with cold rolling reduction was analysed to understand the mechanisms behind this phenomena. It was found that cold rolling activated additional twinning systems which provided a large number of potent nucleation sites for strain induced martensite to form during subsequent tensile tests in what can be described as an enhanced TRIP effect.

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Section: A Alloying Conceptmentioning

confidence: 99%

Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel

Kwok

Gong

et al. 2021

Metall Mater Trans A

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“…7. Generally, for Fe-Mn-Al-C lightweight steels with a carbon content of 0.8 the kinetics of the κ precipitation is weak and the available evidence suggests that κ may only precipitate during aging above 600℃ for 2 h or at 500 ℃ for more than 6 hours [49][50][51][52][53], and the volume fraction of κ is only about 2% [41,54]. However, the volume content of κ in the DPD-0.75-450 samples reached ~6%, indicating DPD processing promotes the κ precipitation.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Microstructure and mechanical properties of an Fe–Mn–Al–C lightweight steel after dynamic plastic deformation processing and subsequent aging

Wang

Cheng

Gao

et al. 2022

Materials Science and Engineering: A

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“…Few or only a few amount of Mn is added to ferrite LDS because of the expansion of the austenite phase zone of Mn [25][26][27][28][29]. Austenitic LDS can be divided into duplex LDS and austenitic LDS according to the different alloying elements and the second phase [5,[30][31][32][33]. The composition of duplex LDS is similar to that of austenitic LDS, but the final structure contains two phases of ferrite and austenite.…”

Section: Metallurgical Characteristic Of Ldsmentioning

confidence: 99%

“…However, the alloy strengthened by the B2 phase is usually coldrolled after hot rolling to refine the grain and then annealing [5,36,41]. For duplex LDS, it can also be annealed at 1000 ℃ for 1 h after hot rolling [16,32,[42][43][44]. The heat treatment of the duplex LDS with Ni addition is the same as that of the austenitic LDS with Ni addition [17,45].…”

Section: Metallurgical Characteristic Of Ldsmentioning

confidence: 99%

Recent Advances on the Corrosion Resistance of Low-Density Steel: A Review

Liu

Cheng

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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This paper reviews the previous literature on the alloy composition design of low-density steel (LDS), focusing on the effect of Al, Mn, Ni, and other alloy elements on the formation of the steel matrix and second phase, and provides classification. The microstructure of LDS after processing includes the matrix structure, к-carbide, and B2 (FeAl, NiAl, or MnAl) phase of ferritic LDS, austenitic LDS, and dual-phase LDS. The influence of alloy elements on the corrosion resistance of LDS is derived from the addition of Al and Mn for metallurgy. Additionally, the influence of Cr and Mo addition on the corrosion resistance improvement was studied. The electrochemical properties of the corrosion process in LDS are discussed. Further, the microstructure of LDS affects the corrosion resistance properties including pitting corrosion, hydrogen embrittlement, and SCC (stress corrosion cracking). Finally, future research directions are proposed.

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Improvement of tensile properties in (austenite+ferrite+κ-carbide) triplex hot-rolled lightweight steels

Cited by 28 publications

References 36 publications

Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel

Microstructure Evolution and Tensile Behaviour of a Cold Rolled 8 Wt Pct Mn Medium Manganese Steel

Microstructure and mechanical properties of an Fe–Mn–Al–C lightweight steel after dynamic plastic deformation processing and subsequent aging

Recent Advances on the Corrosion Resistance of Low-Density Steel: A Review

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