On the technological properties of steel strips aluminized in Al-Si baths

Shady, M. A.; EL-Sissi, A. R.; Attia, Ali M.A.; El‐Mahallawy, N. A.; Taha, M. A.; Reif, W.

doi:10.1007/bf00274898

Cited by 13 publications

(7 citation statements)

References 4 publications

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“…Generally, it is known that when steel is hot-dipped in Al-10 wt % Si alloy, not only melting point and viscosity of Al-Si coating decreased but also the growth of the η phase is suppressed. Thus, the thickness of the brittle intermetallic compound can be effectively minimized [16][17][18][19]. Moreover, the effect of Si on the growth mechanism of the η phase has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

TEM Microstructural Evolution and Formation Mechanism of Reaction Layer for 22MnB5 Steel Hot-Dipped in Al–10% Si

Shin¹,

Lee

Heo

et al. 2018

Coatings

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Microstructural evolution and formation mechanism of reaction layer for 22MnB5 steel hot-dipped in Al–10Si (in wt %) alloy was investigated. The microstructural identification of the reaction layer was characterized via transmission electron microscopy and electron backscatter diffraction. In addition, the formation mechanisms of the phases were discussed with vertical section (isopleth) of the (Al–Si–Fe) ternary system. The solidified Al–Si coating layer consisted of three phases of Al, Si, and τ5 (Al8Fe2Si). The reaction layer on the Al–Si coating layer side is a fine τ5 phase (Al8Fe2Si) of 5 μm thickness. The layer on the steel side consisted of an η phase (Fe2Al5) of thickness of 500 nm or less. τ1 (Al2Fe3Si3, triclinic) phase of 200-nm-thickness was formed in the η phase, and κ phase (Fe3AlC) of 40–50 nm thickness was formed between η phase and steel. The τ5 phase was formed by isothermal solidification at 690 °C in the liquid Al–10 wt % Si when 3.73–29.0 wt % of Fe was dissolved from the boron steel into the Al–Si liquid bath. It was considered that the η phase was formed by the diffusion reaction of Al, Si, and Fe between τ5 and ferrite steel. κ (Fe3AlC) phase was formed by the reaction of the carbon, which is barely employed in η and τ phases, and diffused Al.

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Section: Introductionmentioning

confidence: 99%

TEM Microstructural Evolution and Formation Mechanism of Reaction Layer for 22MnB5 Steel Hot-Dipped in Al–10% Si

Shin¹,

Lee

Heo

et al. 2018

Coatings

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“…Elements existing in the intermetallic layer also influence the growth of the layer. Silicon is well known to retard the growth of the layer [1,3,4,6,9]. Silicon is reported to preoccupy structural vacant sites in the intermetallic layer, which impedes the diffusion of aluminum and iron through the layer [1,6].…”

Section: Discussionmentioning

confidence: 99%

“…During the HDA process, silicon is normally added into the melt to reduce the thickness of the brittle intermetallic layer as well as to increase surface hardness of the steel sheet. However, a limit of silicon concentration in the melt is reported; the layer thickness hardly decreases with addition of silicon over around 10 wt.% [1,3]. Numerous works are available regarding the effect of composition of the melt on the dissolution and the thickness of the intermetallic layer.…”

Section: Introductionmentioning

confidence: 95%

“…The method consists of dipping the sheet in a molten aluminum or aluminum alloy bath maintained at a fixed temperature for a certain period. The HDA is performed in industries mostly in a continuous way [1][2][3][4]. For a continuous transport of the steel sheet during the HDA process, facilities such as a pot roll and a journal bearing are operated as being immersed in the molten metal bath.…”

Section: Introductionmentioning

confidence: 99%

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Effects of carbon content of carbon steel on its dissolution into a molten aluminum alloy

Hwang

Song

Kim

2005

Materials Science and Engineering: A

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“…On the other hand, when Si is added to a molten bath when hot-dipping the carbon steel and low alloy steel, the thickness of the produced intermetallic compound Fe 2 Al 5 (η) phase during plating can be reduced. In addition, the melting point and viscosity of the molten bath can be reduced to increase the coating ability [16][17][18]. Several mechanisms were proposed to explain the decrease in the thickness of the Fe 2 Al 5 (η) phase due to the addition of Si, such as an Al diffusion delay due to the Si solubility in the Fe 2 Al 5 (η) phase vacancy [16,19], Al diffusion delay due to the Si segregated in the Fe 2 Al5(η) phase grain boundary [20], and a reduction in the Al activation coefficient due to the addition of Si [21,22].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Reaction Layer of 1.5 GPa Boron Steel Hot-Dipped in Al-7wt%Ni-6wt%Si Alloy

Lee

Heo

Kang

et al. 2018

Metals

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The constituents, distribution, and characteristics of the phases formed on the coating layer of boron steel hot-dipped in Al-7wt%Ni-6wt%Si were evaluated in detail. In particular, the microstructure and phase constitution of the reaction layer were characterized. Moreover, the microstructural evolution mechanism of the phase was presented with reference to the (Al-7wt%Ni-6wt%Si)-xFe from the pseudo-binary phase diagram. The solidification layer consisted mainly of Al, Al3Ni, and Si phases. Reaction layers were formed in the order of Al9FeNi(Τ), Fe4Al13(θ), and Fe2Al5(η) from the solidification layer side. In addition, the κ (Fe3AlC) layer was formed at the Fe2Al5(η)/steel interface. From pseudo-binary phase diagram analysis, it was found that Fe4Al13(θ) can form when the Fe concentration is over 2.63 wt% in the 690 °C Al-7wt%Ni-6wt%Si molten metal. When the concentration of Fe increased to 10.0–29.0 wt%, isothermal solidification occurred in the Fe4Al13(θ) and Al9FeNi(Τ) phases simultaneously. Moreover, given that the T phase does not dissolve Si, it was discharged, and the Si phase was formed around the Al9FeNi(T) phase. The Fe2Al5(η) phase was formed by a diffusion reaction between Fe4Al13(θ) and steel, not a dissolution reaction. Moreover, Al2Fe3Si3(τ1) was formed at the Fe4Al13(θ)-Fe2Al5(η) interface by discharging Si from Fe4Al13(θ) without Si solubility. Furthermore, the Fe3AlC(κ) layer was formed by carbon accumulation that discharged in the Fe2Al5(η) region transformed from steel to Fe2Al5(η). The twin regions in the Fe4Al13(θ) and Fe2Al5(η) grain were due to the strains caused by the lattice transformation in the constrained state, wherein the phases are present between the Al9FeNi(Τ) layer and steel.

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On the technological properties of steel strips aluminized in Al-Si baths

Cited by 13 publications

References 4 publications

TEM Microstructural Evolution and Formation Mechanism of Reaction Layer for 22MnB5 Steel Hot-Dipped in Al–10% Si

TEM Microstructural Evolution and Formation Mechanism of Reaction Layer for 22MnB5 Steel Hot-Dipped in Al–10% Si

Effects of carbon content of carbon steel on its dissolution into a molten aluminum alloy

Microstructural Evolution of Reaction Layer of 1.5 GPa Boron Steel Hot-Dipped in Al-7wt%Ni-6wt%Si Alloy

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