Microstructural evolution of intermetallic layer in hot-dipped aluminide mild steel with silicon addition

Cheng, Wei-Jen; Wang, Chaur-Jeng

doi:10.1016/j.surfcoat.2011.04.061

Cited by 110 publications

(66 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In other words, the Fe 2 Al 5 (η) phase will be formed in a smaller amount than that observed in the phase diagram due to interdiffusion. Studies on the intermetallic compounds formed by the diffusion of Fe and pure Al [10][11][12], Fe and Al alloy [13,14], steel and pure Al [15][16][17][18][19][20][21][22][23][24][25], and steel and Al alloy [26][27][28][29] have been conducted for a long time. The intermetallic compounds formed in these studies were classified into three types: (1) [10][11][12][13][14][15][16][17][18]26,27].…”

Section: Discussionmentioning

confidence: 99%

“…Studies on the morphology of the Fe 2 Al 5 (η) phase attribute this to the 30% vacancy rate in the c-axis of the crystal structure of Fe 2 Al 5 (η) phase, which can be seen as a rapid diffusion tunnel. This causes the Fe 2 Al 5 (η) phase to be orientated by the fixed c-axis of the crystal, due to which it grows preferentially along the [001] direction during hot-dipping [18,[26][27][28].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy

et al. 2017

View full text Add to dashboard Cite

Abstract:The formation mechanism of intermetallic compounds formed in boron steel hot-dipped in Al-7Ni (wt %) at 690 • C for 10-120 s was studied by identifying the intermetallic phases and investigating the growth process. Initially, a Fe 3 O 4 oxide layer formed on the steel. The oxide layer separated into multiple layers sporadically; following this, the Al-Ni molten alloy permeated into the region of the oxide layer breakdown and formed the Al 9 FeNi (T, monoclinic, space group: P21/c) phase on the steel surfaces. The Al 9 FeNi (T) phase formed from the reaction between the Al-Ni molten alloy and Fe eluted from the steel; this phase not only acts as an Al interdiffusion channel, but also as a barrier for Fe; and facilitates only grain growth without a significant change in thickness. Inside the steel, the Fe 2 Al 5 (η, orthorhombic, space group: Cmcm) phase grows along the c-axis in the [001] direction; and has a long columnar structure. The Fe 3 AlC (κ, Cubic, space group: Pm3m) phase is formed owing to a reduction in the Al concentration and the simultaneous diffusion and discharge of C toward the steel interface, as C cannot dissolve in the Fe 2 Al 5 (η) phase.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Figure 1a indicates that the hot-dipped coating consists of the Al topcoat with a thickness of about 50-60 µ m and the Al-Fe alloy layer with a thickness of 170-230 µm. The characteristic finger-or tongue-like morphology was seen between the Al-Fe alloy layer with the columnar microstructure and the steel substrate having equiaxed grains [8]. It originated from the fast inward diffusion of Al during hotdipping through the orthorhombic Al5Fe2 with 30% vacancies along the c-axis [4], or from the atomic size mismatch between Al (atomic radius; 0.143 nm) and Fe (atomic radius; 0.126 nm) [9].…”

Section: Methodsmentioning

confidence: 99%

Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2/0.1% H2S Gas

Abro

Lee

2016

Metals

View full text Add to dashboard Cite

High-temperature corrosion of carbon steel in N 2 /0.1% H 2 S mixed gas at 600-800˝C for 50-100 h was studied after hot-dipping in the aluminum molten bath. Hot-dipping resulted in the formation of the Al topcoat and the Al-Fe alloy layer firmly adhered on the substrate. The Al-Fe alloy layer consisted primarily of a wide, tongue-like Al 5 Fe 2 layer and narrow Al 3 Fe layer. When corroded at 800˝C for 100 h, the Al topcoat partially oxidized to the protective but non-adherent α-Al 2 O 3 layer, and the interdiffusion converted the Al-Fe alloy layer to an (Al 13 Fe 4 , AlFe 3 )-mixed layer. The interdiffusion also lowered the microhardness of the hot-dipped steel. The α-Al 2 O 3 layer formed on the hot-dipped steel protected the carbon steel against corrosion. Without the Al hot-dipping, the carbon steel failed by forming a thick, fragile, and non-protective FeS scale.

show abstract

“…EDS analysis was performed throughout the microstructure in order to understand the differences in composition between the intermetallic phases and the results are reported in Table 4. Intermetallic formation in Al-Fe-Si has been studied extensively and is well documented [9,10,[21][22][23][24]. As a note, all intermetallic phases found in Al-S CMF include some traces of alloying elements Cr and Ni, which have diffused from the sphere wall into the matrix, occupying the sites of Fe atoms in the Al-Fe-Si intermetallic phases [11,12].…”

Section: Sem Images Inmentioning

confidence: 99%

Effect of Sphere Properties on Microstructure and Mechanical Performance of Cast Composite Metal Foams

Garcia-Avila

Rabiei

2015

Metals

View full text Add to dashboard Cite

Aluminum-steel composite metal foams (Al-S CMF) are manufactured using steel hollow spheres, with a variety of sphere carbon content, surface roughness, and wall porosity, embedded in an Aluminum matrix through gravity casting technique. The microstructural and mechanical properties of the material were studied using scanning electron microscopy, energy dispersive spectroscopy, and quasi-static compressive testing. Higher carbon content and surface roughness in the sphere wall were responsible for an increase in formation of intermetallic phases which had a strengthening effect at lower strain levels, increasing the yield strength of the material by a factor of 2, while higher sphere wall porosity resulted in a decrease on the density of the material and improving its cushioning and ductility maintaining its energy absorption capabilities.

show abstract

Microstructural evolution of intermetallic layer in hot-dipped aluminide mild steel with silicon addition

Cited by 110 publications

References 19 publications

Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy

Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy

Effect of Al Hot-Dipping on High-Temperature Corrosion of Carbon Steel in N2/0.1% H2S Gas

Effect of Sphere Properties on Microstructure and Mechanical Performance of Cast Composite Metal Foams

Contact Info

Product

Resources

About