Isothermal and thermal cycling oxidation of hot-dip aluminide coating on flake/spheroidal graphite cast iron

Lin, Meng-Bin; Wang, Chaur-Jeng; Volinsky, Alex A.

doi:10.1016/j.surfcoat.2011.06.010

Cited by 17 publications

(15 citation statements)

References 14 publications

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“…According to the EDS (EDS analysis of needles at 3 and 6 locations is performed at 10,000 times) in Table 2 (EDS spectra in Figure 2) and the XRD results in Figure 3, the aluminide coatings on FC and FCD consist of an outer Al topcoat and inner Fe2Al5 coating, and FeAl3 is distributed in the outer Al topcoat in bulk and rod forms. These are consistent with the results reported by Lin et al [13] and Zhang et al [16]. From Figure 1, we can observe that the inner Fe2Al5 intermetallic coating of aluminized FCD grows inward as a tongue-like structure perpendicular to the matrix.…”

Section: Microstructure and Phase Analysessupporting

confidence: 92%

“…The Kp of HDDA FC is relatively high; therefore, the HDDA coating on FCD has better high-temperature oxidation resistance than that of FC. Compared to the results reported by Lin et al [13], it can be found that the Kp value of HDDA is lower than that of hot-dip aluminizing. The main reason is that the oxidation resistance of Fe-Al alloy coating is better than that of Al alloy coating [9].…”

Section: High-temperature Oxidationcontrasting

confidence: 85%

“…The effect of flake/spheroidal graphite morphology on the high-temperature oxidation resistance of hot-dip aluminide cast iron has been studied extensively. For example, Lin et al [13] found that aluminide coating on FCD was superior to FC in terms of oxidation resistance. Oxidation channels formed due to the oxidation of the flake graphite, resulting in the further oxidation of the FC matrix.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Graphite Morphology on Phase, Microstructure, and Properties of Hot Dipping and Diffusion Aluminizing Coating on Flake/Spheroidal Graphite Cast Iron

Zhang¹,

Fan²,

Zhao³

et al. 2019

Metals

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The influence of graphite morphology on the phase, microstructure and properties of hot dipping and diffusion aluminizing (HDDA) coating on flake/spheroidal graphite cast iron (FC/FCD) was investigated. The microstructure and properties of the HDDA coatings on FC/FCD were determined by the graphite morphology. The outer and inner layers of the HDDA coating comprised the Fe2Al5 and FeAl phases, respectively. The outer layer of HDDA on FCD was dense and uniform; however, some pores of different sizes were found in the outer coating on FC, resulting in looser HDDA coating. Hence, the wear resistance of the HDDA coating on FC was worse than that of the coating on FCD. During oxidation, many continuous oxidation channels were formed from the coating surface to the matrix in the HDDA coating on FC, resulting in the oxidation of graphite in the HDDA coating and the matrix. However, only exposed spheroidal graphite was oxidized in the HDDA coating on FCD. Thus, the high-temperature oxidation resistance of the HDDA coating on FC was also worse than that of the coating on FCD.

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Section: Microstructure and Phase Analysessupporting

confidence: 92%

Section: High-temperature Oxidationcontrasting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Influence of Graphite Morphology on Phase, Microstructure, and Properties of Hot Dipping and Diffusion Aluminizing Coating on Flake/Spheroidal Graphite Cast Iron

Zhang¹,

Fan²,

Zhao³

et al. 2019

Metals

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“…Indeed, many different authors have reported that Si reduces the rate of diffusion of solid state Al in iron-based alloys and prevents the uneven growth of Fe2Al5 [23][24][25][26][27]. The second phenomenon is related to the presence of graphite nodules at the surface.…”

Section: Slurry Aluminization Of Dadi Steelmentioning

confidence: 99%

High Temperature Oxidation of Slurry Aluminized Deformable Austempered Ductile Iron (DADI)

Tsurtsumia

Pedraza

Grégoire

et al. 2019

Metall Mater Trans A

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This work reports on the aluminization and oxidation behaviour of a new class of cast iron (Deformable Austempered Ductile Iron, DADI). The slurry aluminization resulted in uneven coatings due to the lack of wettability of molten aluminium to the graphite inclusions of the substrate. In spite of this, the isothermal tests at 650°C for 100h in air revealed a drastic reduction of oxygen uptake related to the formation of mixed Al-containing spinels compared to the very unprotective iron oxides formed in the absence of coating. It derives that deposition of thicker aluminide layers by precoating with e.g. nickel would be a promising way to protect further DADI cast iron.

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“…In addition, spheroidal graphites located in substrate are obstacle [21]. Many efforts have been made on hot dip aluminizing to produce iron aluminum intermetallic layer on cast iron [6,22]. However, the adhesion of alumina scale over the aluminide coating has been a major concern.…”

mentioning

confidence: 99%

Process and High-Temperature Oxidation Resistance of Pack-Aluminized Layers on Cast Iron

Wang

Fan

Zhao

et al. 2019

Metals

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Pack aluminizing of spheroidal graphite cast iron with different aluminizing temperature and time was studied. Results showed that the thickness of aluminized layer increased with the increasing temperature and time. The optimized process parameters are as follow: the aluminizing packed temperature is 830 °C and the time is 3 h. The aluminized layer consisted of the inner FeAl and the outer Fe2Al5. Some graphite nodules were observed in the aluminide layer after aluminizing. The mass gain of the aluminized cast iron was 0.405 mg/cm2, being 1/12 of the untreated substrate after oxidation. The high temperature oxidation resistance can be improved effectively by pack aluminizing, even though there were graphite nodules in the aluminide layer.

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Isothermal and thermal cycling oxidation of hot-dip aluminide coating on flake/spheroidal graphite cast iron

Cited by 17 publications

References 14 publications

Influence of Graphite Morphology on Phase, Microstructure, and Properties of Hot Dipping and Diffusion Aluminizing Coating on Flake/Spheroidal Graphite Cast Iron

Influence of Graphite Morphology on Phase, Microstructure, and Properties of Hot Dipping and Diffusion Aluminizing Coating on Flake/Spheroidal Graphite Cast Iron

High Temperature Oxidation of Slurry Aluminized Deformable Austempered Ductile Iron (DADI)

Process and High-Temperature Oxidation Resistance of Pack-Aluminized Layers on Cast Iron

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