Development of a Lightweight Third-Generation Advanced High-Strength Steel (3GAHSS) Vehicle Body Structure

Savic, Vesna; Hector, Louis G.; Singh, Harinder; Paramasuwom, Mahendran; Basu, Ushnish; Basudhar, Anirban; Stander, Nielen

doi:10.4271/2018-01-1026

Cited by 27 publications

(11 citation statements)

References 16 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%

“…reaching thermodynamic equilibrium) within several minutes, allowing IA to be conducted on a Continuous Annealing Line (CAL) [6] where the heating stage is usually between 2 and 3 minutes long. Otherwise, IA would have to be conducted in batch annealing furnaces for a minimum of several hours, [7] severely reducing productivity.…”

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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“…Second, the Combined Constraints Crystal Plasticity (CCCP) model was implemented as a microscale constitutive model [40]. In this project, two targets were set by the United States Department of Energy: one is the 1200 MPa strength with 30% total elongation (which means C = 1200 × 30 = 36,000 MPa × %), and the other one is 1500 MPa strength with 25% total elongation (which means C = 1500 × 25 = 37,500 MPa × %) [41].…”

Section: Recent Results and Future Trends In Ahss Developmentmentioning

confidence: 99%

Development of Lightweight Steels for Automotive Applications

Tisza¹

2020

Engineering Steels and High Entropy-Alloys

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The automotive industry plays a determinant role in the economy of developed countries. Sheet metal forming is one of the most important processes in car manufacturing. Recent trends in car production may be characterized by the application of lightweight principles. Its main priority is to fulfill both the customers' demands and the increased legal requirements. The application of high strength steels may be regarded as one of the potential possibilities. Applying high strength steels has a positive response for many of the requirements: increasing the strength may lead to the application of thinner sheets resulting in significant mass reduction. Mass reduction is leading to lower consumption with increased environment protection. However, increasing the strength can often lead to the decrease of formability, which is very unfavorable for the forming processes. In this chapter, an overview of recent material developments in the automotive industry concerning the use of new-generation high strength steels will be given. In this paper, the material developments are emphasized from the point of view sheet metal forming; therefore, our focus is on the body-in-white manufacturing in the automotive industry.

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“…Termed as the ''High Strength À Exceptional Ductility'' steel, it had a tensile strength of 1200 MPa and elongation of 37 pct and could be used in the front or rear pillars of an automotive body in white (BIW) to protect from front or rear impact. [1] The Mn content in these steels (4 to 12 wt pct) is significantly lower than high Mn twinning-induced plasticity (TWIP) steels (16 to 30 wt pct) and are, therefore, more attractive from an industrial perspective in terms of cost and ease of production. The high Mn content in TWIP steels posed many challenges to steelmakers during industrialization efforts over the past two decades.…”

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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Development of a Lightweight Third-Generation Advanced High-Strength Steel (3GAHSS) Vehicle Body Structure

Cited by 27 publications

References 16 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

Development of Lightweight Steels for Automotive Applications

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

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