Selection and use of coated advanced high-strength steels for automotive applications

Bode, R.; Meurer, Markus; Schaumann, T. W.; Warnecke, W.

doi:10.1051/metal:2004123

Cited by 15 publications

(11 citation statements)

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“…[17][18][19] The strengthening effect and required microstructure can be obtained by addition of minor alloying elements such as C, Mn, Al and Si, [20][21][22] where Al plays a role to stabilize austenite and to substitute for Si in view of the detrimental effect of Si such as the formed Si-oxides on the surface do not wet with coating alloy resulting in the uncoated regions during galvanizing process. 23,24) The addition of Al in the steel, however, may cause great process control problems due to the chemical reactions between SiO2 in mold slag and dissolved Al in steel, 25,26) which results in a significant increase in the mass ratio between Al2O3 and SiO2 (mAl 2 O 3 / mSiO 2 ) ratio in the mold slag as continuous casting progresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3/SiO2 Ratio on the Viscosity and Structure of Slags

et al. 2012

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The present paper investigates how the mass ratio between Al2O3 and SiO2 (mAl 2 O 3 /mSiO 2 ) in slag compositions influences the structure, viscosity and crystallization of the slag melts. The objective is to study the variations in viscosity and structure of slags with increasing mAl 2 O 3 /mSiO 2 ratio. In practice the results of the study are relevant to the significant changes in slag property caused by the changes in chemical composition during continuous casting of steels containing high amounts of dissolved aluminum.The viscosity was found to decrease slightly with increasing mAl 2 O 3 /mSiO 2 ratio up to 0.56. The degree of polymerization for [SiO4]-tetrahedra was found to decrease with increasing mAl 2 O 3 /mSiO 2 ratio based on the Fourier Transformation-Infrared Spectra (FT-IR) and Raman spectra, which could explain the observed decrease in viscosity. AtmAl 2 O 3 /mSiO 2 ratios above 0.56, the viscosity was found to abruptly increase which could be caused by the presence of spinel crystals. The activity coefficient was computed and it was found that the activity coefficient of alumina presents negative deviation when mAl 2 O 3 /mSiO 2 ratio is less than 0.35, while it shows a positive deviation when mAl 2 O 3 /mSiO 2 ratio exceeds 0.35. This phenomenon may be related to the change of the primary phase region correlating to the phase diagram to the slag composition.

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Section: Introductionmentioning

confidence: 99%

Effect of Al2O3/SiO2 Ratio on the Viscosity and Structure of Slags

et al. 2012

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“…Under the above annealing conditions, these two elements produce manganese oxides and silicon oxides or combination of both which have been reported to cause poor wetting. 13) An IF steel produced in a random order along with DP steels is shown in the same figure. An obvious difference between the IF steel and DP steels was observed.…”

Section: Visual Observationsmentioning

confidence: 99%

“…13,14) Bode et al 13) tabulated free enthalpy of formation data from literature for oxidation of individual elements for a given annealing condition. The data given in Table 3 shows that the enthalpies of formation of MnO and SiO2 are much lower than that of MoO2 and Fe3O4.…”

Section: Surface Chemistrymentioning

confidence: 99%

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Influence of Substrate Molybdenum on Galvannealing Kinetics of an Advanced High Strength Steel

2014

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Advanced high strength steels (AHSS) are used for car body applications in the automotive industry to improve passenger safety, improve fuel efficiency and to lower harmful carbon emissions. Galvannealed AHSS are used to provide corrosion protection. AHSS are alloyed with several elements such as Mn, Si, Al, P, Mo, etc. to achieve better mechanical properties. However, the knowledge of the effects of Mo on galvannealing behavior is limited. This investigation was conducted to study the influence of molybdenum in steel on galvannealing kinetics. Five dual-phase steels with Mo varying from 0 wt% to 0.4 wt% were used for this study. The results showed a delay in the galvannealing kinetics with an increase in the steel molybdenum content. No obvious improvement in the coating appearance was observed with increasing molybdenum.

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“…The dual phase steels with a high strength to weight ratio have created great interest in the automotive sector [1]- [4]. The dual phase heat treatment can be applied to low-carbon steels with carbon content higher than 0.1% and to specimens which have sections larger than 1.0 mm [5].…”

Section: Literature Surveymentioning

confidence: 99%

The Effect of Carbon Content in Martensite on the Strength of Dual Phase Steel

P.D¹

2012

BIJIEMS

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Selection and use of coated advanced high-strength steels for automotive applications

Cited by 15 publications

References 0 publications

Effect of Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> Ratio on the Viscosity and Structure of Slags

Effect of Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> Ratio on the Viscosity and Structure of Slags

Influence of Substrate Molybdenum on Galvannealing Kinetics of an Advanced High Strength Steel

The Effect of Carbon Content in Martensite on the Strength of Dual Phase Steel

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