Features of intermetallic compounds in aluminized steels formed using aluminum foil

Sasaki, Tomohiro; Yakou, Takao

doi:10.1016/j.surfcoat.2006.03.018

Cited by 52 publications

(35 citation statements)

References 14 publications

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“…[10][11][12][13][20][21][22][23][24][25] After 1 min hot-dip aluminizing treatment at 800°C, the maximum reported layer thickness consisting of Fe 2 Al 5 is about 200 mm.…”

Section: Identification Of the Solid And Liquid Phases At Experimentsmentioning

confidence: 99%

“…20,21) The growth kinetics of the intermetallic layers is reported to be diffusion-controlled, following a general parabolic equation [11][12][13]20,25) from which activation energies for the growth of Fe 2 Al 5 , FeAl and aFe(Al) were evaluated. The thickness of aFe(Al) and FeAl heated at, respectively, 1 811 K and 1 583 K, which are the respective melting point of these compounds, were calculated for diffusion times of 35 and 65 s (samples 1 and 6), using the reported growth law relations.…”

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confidence: 99%

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Interfacial Reactions between Oxygen Containing Fe and Al at the Onset of Liquid Fe Deoxidation by Al Addition

et al. 2010

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“…[10][11][12][13][20][21][22][23][24][25] After 1 min hot-dip aluminizing treatment at 800°C, the maximum reported layer thickness consisting of Fe 2 Al 5 is about 200 mm.…”

Section: Identification Of the Solid And Liquid Phases At Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

Interfacial Reactions between Oxygen Containing Fe and Al at the Onset of Liquid Fe Deoxidation by Al Addition

et al. 2010

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“…특히 알루미늄 합금과 탄소강의 HDA 공정은 여러 분야에서 높은 적용성을 보이고 있으며 그에 따른 연구도 활발히 진행되 었다 [1,3,4,7,9]. 그러나 부품소재산업에서 활용도가 높은 주철과 알루미늄 합금간의 HDA 공정에 관한 연구는 아직 충분한 연 구가 진행되지 못한 상태이다.…”

Section: 서 론unclassified

Behavior of Graphite and Formation of Intermetallic Compound Layer in Hot Dip Aluminizing of Cast Iron

Han¹,

Kang²,

Kang³

et al. 2011

Journal of the Korea Foundry Society

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Hot dip aluminizing (HDA) is widely used in industry for improving corrosion resistance of material. The formation of intermetallic compound layers during the contact between dissimilar materials at high temperature is common phenomenon. Generally, intermetallic compound layers of Fe 2 Al 5 and FeAl 3 are formed at the Al alloy and Fe substrate interface. In case of cast iron, high contact angle of graphite existed in the matrix inhibits the formation of intermetallic compound layer, which carry with it the disadvantage of a reduced reaction area and mechanical properties. In present work, the process for the removal of graphite existed on the surface of specimen has been investigated. And also HDA was proceeded at 800 o C for 3 minutes in aluminum alloy melt. The efficiency of graphite removal was increased with the reduction of particle size in sanding process. Graphite appears to be present both in the region of melting followed by re-solidification and in the intermetallic compound layer, which could be attributed to the fact that the surface of cast iron is melted down by the formation of low melting point phase with the diffusion of Al and Si to the cast iron. Intermetallic compound layer consisted of Fe(Al,Si) 3 and Fe 2 Al 5 Si, the layer formed at cast iron side contained lower amount of Si.

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“…[1][2][3][4][5][6][7][8] In recent years, however, the formation of an Fe-rich alloy layer consisting of FeAl and aluminum solid solution (aFe(Al)) with aluminum content lower than 30 mass% has been demonstrated using "High temperature aluminizing", wherein the hot dip aluminized steel is heated to a temperature above 900°C. [9][10][11][12][13] Previous research has shown that the alloy layer formed by high temperature aluminizing improves wear resistance of the alloy layer 11) and the bending workability 12) of aluminized steel because of comparatively higher toughness and functionally gradient properties due to the gradual variation of aluminum composition. In addition, we have reported that an Fe-rich alloy layer with a higher toughness is formed by "foil aluminizing" wherein steel with aluminum foil bonded on the surface is heated above 900°C.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, we have reported that an Fe-rich alloy layer with a higher toughness is formed by "foil aluminizing" wherein steel with aluminum foil bonded on the surface is heated above 900°C. 13) During the process of high temperature heating of the aluminum-coated steel, Fe 2 Al 5 is first formed by reaction diffusion between the molten aluminum and steel, and subsequently, the Fe-rich alloy layer is formed as an intermediate layer between Fe 2 Al 5 and the steel. [9][10][11][12][13] Therefore, the formation of the Fe-rich alloy layer during high temperature aluminizing is likely due to the diffusion phenomenon between Fe 2 Al 5 and steel.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment Conditions on Formation of Fe-Al Alloy Layer during High Temperature Aluminizing

Sasaki

Yakou

2007

ISIJ Int.

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Diffusion couples of Fe 2 Al 5 and various substrates with different carbon content, pure iron, 0.27 mass% C steel and 0.45 mass% C steel were processed, and the formation of an Fe-Al alloy layer in the temperature range from 750 to 1 000°C was investigated. FeAl 2 , FeAl, and aluminum solid solution (aFe(Al)) were confirmed in the alloy layer formed by heating the diffusion couples. Voids were generated inside the Fe 2 Al 5 layer and near the interface between the FeAl layer and aFe(Al) layer. The layer growth of FeAl and aFe(Al) obeyed the parabolic law of the diffusion time, t 1/2 . However, the thickness of FeAl saturated over a diffusion time longer than 3.6 ks at 950°C because of the concentration of voids at the FeAl layer/aFe(Al) layer interface and the disappearance of the Fe 2 Al 5 layer. The activation energy for the formation of the FeAl layer in all kinds of the substrates was approximately 200 kJ/mol in the whole temperature range and the substrate. On the other hand, the activation energies for the aFe(Al) layer in the 0.27 mass% C steel and the 0.45 mass% C steel were larger than that in pure iron at 750-800°C.

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Features of intermetallic compounds in aluminized steels formed using aluminum foil

Cited by 52 publications

References 14 publications

Interfacial Reactions between Oxygen Containing Fe and Al at the Onset of Liquid Fe Deoxidation by Al Addition

Interfacial Reactions between Oxygen Containing Fe and Al at the Onset of Liquid Fe Deoxidation by Al Addition

Behavior of Graphite and Formation of Intermetallic Compound Layer in Hot Dip Aluminizing of Cast Iron

Effects of Heat Treatment Conditions on Formation of Fe-Al Alloy Layer during High Temperature Aluminizing

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