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

Wang, Hesong; Zhang, Yuanxiang; Ran, Rong; Wang, Yang; Kang, Jian; Li, Y.J.; Misra, R.D.K.; Yuan, Guo; Wang, Guodong

doi:10.1080/02670836.2019.1618620

Cited by 15 publications

(18 citation statements)

References 42 publications

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“…13-U30 diagram comparing alloying cost and energy absorption between several medium Mn steels in the literature and commerical steels. [2,3,5,7,12,13,35,39,40,[63][64][65][66][67][68][69] *ThyssenKrupp dual phase steels.…”

Section: Effect Of Cold Rolling On Yield Point Elongationmentioning

confidence: 99%

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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: Effect Of Cold Rolling On Yield Point Elongationmentioning

confidence: 99%

“…For example, recent advances in strip casting technology have shown that medium Mn steel can be successfully cast into 2.5 mm thick strip. [12] With this in mind, reliance on cold rolling for heavy gauge reduction can be reduced. Cold rolling can then be pushed to the end of the processing route (i.e.…”

Section: Introductionmentioning

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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“…However, the composition window where the TWIPþTRIP mechanism is active is usually very narrow. [10] Nevertheless, Wang et al [11] showed that microsegregation in a fairly lean medium Mn steel could be avoided by twin roll casting. Their steel of composition Fe-4Mn-1.8Al-0.6Si-0.3C with a cast thickness of 2.5 mm did not show significant microsegregation and was also able to demonstrate the TWIP þ TRIP effect after final processing.…”

Section: Introductionmentioning

confidence: 99%

A Scale-up Study on Chemical Segregation and the Effects on Tensile Properties in Two Medium Mn Steel Castings

Kwok

Slater

et al. 2021

Metall Mater Trans A

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Two ingots weighing 400 g and 5 kg with nominal compositions of Fe–8Mn–4Al–2Si–0.5C–0.07V–0.05Sn were produced to investigate the effect of processing variables on microstructure development. The larger casting has a cooling rate more representative of commercial production and provides an understanding of the potential challenges arising from casting-related segregation during efforts to scale up medium Mn steels, while the smaller casting has a high cooling rate and different segregation pattern. Sections from both ingots were homogenized at 1250 $$^{\circ} $$ ∘ C for various times to study the degree of chemical homogeneity and $$\delta $$ δ -ferrite dissolution. Within 2 hours, the Mn segregation range (max–min) decreased from 8.0 to 1.7 wt pct in the 400 g ingot and from 6.2 to 1.5 wt pct in the 5 kg ingot. Some $$\delta $$ δ -ferrite also remained untransformed after 2 hours in both ingots but with the 5 kg ingot showing nearly three times more than the 400 g ingot. Micress modeling was carried out, and good agreement was seen between predicted and measured segregation levels and distribution. After thermomechanical processing, it was found that the coarse untransformed $$\delta $$ δ -ferrite in the 5 kg ingot turned into coarse $$\delta $$ δ -ferrite stringers in the finished product, resulting in a slight decrease in yield strength. Nevertheless, rolled strips from both ingots showed $$>900$$ > 900 MPa yield strength, $$>1100$$ > 1100 MPa tensile strength, and $$>40$$ > 40 pct elongation with $$<10$$ < 10 pct difference in strength and no change in ductility when compared to a fully homogenized sample.

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“…al. [11] showed that microsegregation in a fairly lean medium Mn steel could be avoided by twin roll casting. Their steel of composition Fe-4Mn-1.8Al-0.6Si-0.3C with a cast thickness of 2.5 mm did not show significant microsegregation and was also able to demonstrate the TWIP+TRIP effect after final processing.…”

Section: Introductionmentioning

confidence: 99%

A scale up study on chemical segregation and the effects on tensile properties in two medium Mn steel castings

Kwok¹,

Slater²,

Xu³

et al. 2021

Preprint

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Two ingots weighing 400 g and 5 kg with nominal compositions of Fe-8Mn-4Al-2Si-0.5C-0.07V-0.05Sn were produced to investigate the effect of processing variables on microstructure development. The larger casting has a cooling rate more representative of commercial production and provides an understanding of the potential challenges arising from casting-related segregation during efforts to scale up medium Mn steels, whilst the smaller casting has a high cooling rate and different segregation pattern. Sections from both ingots were homogenised at 1250 • C for various times to study the degree of chemical homogeneity and δ-ferrite dissolution. Within 2 h, the Mn segregation range (max − min) decreased from 8.0 to 1.7 wt% in the 400 g ingot and from 6.2 to 1.5 wt% in the 5 kg ingot. Some δ-ferrite also remained untransformed after 2 h in both ingots but with the 5 kg ingot showing nearly three times more than the 400 g ingot. Micress modelling was carried out and good agreement was seen between predicted and measured segregation levels and distribution. After thermomechanical processing, it was found that the coarse untransformed δ-ferrite in the 5 kg ingot turned into coarse δ-ferrite stringers in the finished product, resulting in a slight decrease in yield strength. Nevertheless, rolled strips from both ingots showed >900 MPa yield strength, >1100 MPa tensile strength and >40% elongation with <10% difference in strength and no change in ductility when compared to a fully homogenised sample.

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

Cited by 15 publications

References 42 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

A Scale-up Study on Chemical Segregation and the Effects on Tensile Properties in Two Medium Mn Steel Castings

A scale up study on chemical segregation and the effects on tensile properties in two medium Mn steel castings

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