Growth and surface morphology of hot-dip Al–Si on 9Cr-1Mo steel

Chang, Yo-Yu; Cheng, Wei-Jen; Wang, Chaur-Jeng

doi:10.1016/j.matchar.2008.08.003

Cited by 33 publications

(12 citation statements)

References 29 publications

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“…5a shows that the voids are filled with oxides. This phenomenon is similar to that reported by Chang et al, 23 in which O ions are reported to penetrate into the Fe-Al layer through these voids and cracks, forming the internal oxides in the voids. Figure 6a shows that the nanocrystalline aluminised layer prepared by the double glow discharge technique can offer crystal nuclei for the formation of a-Al 2 O 3 and increase the nucleation density.…”

Section: Oxidationsupporting

confidence: 90%

Diffusion and plasma oxidation mechanism of Fe–Al coatings

Lin¹,

Chen

Tao

et al. 2015

Surface Engineering

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Al coatings were deposited using a pure Al target directly onto pure iron substrates at different temperatures by double glow discharge technique. Then, the Fe-Al coatings were plasma oxidised at 580uC. The results indicated that the aluminide layer was nanocrystalline with many crystal defects after the aluminising process. The oxidation kinetics showed a two-stage behaviour. The energetic O ions with higher driving force diffused into the coatings at the beginning of the oxidation. Then, O ions diffused via short circuit diffusion caused by the existence of large amounts of grain boundaries and crystal defects. After oxidation, a-Al 2 O 3 , c-Al 2 O 3 and Fe 2 O 3 phases were detected. Large amount of voids filled with oxide ions were formed at the outermost aluminide layer owing to the different intrinsic diffusivities of Fe and Al.

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Section: Oxidationsupporting

confidence: 90%

Diffusion and plasma oxidation mechanism of Fe–Al coatings

Lin¹,

Chen

Tao

et al. 2015

Surface Engineering

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“…Hot dipping formed a~20 µm-thick topcoat (spots 1-6), 15 µm-thick transient alloy layer (spots 7-10), and~35 µm-thick underlying alloy layer (spots [11][12][13][14][15][16][17][18][19] on the steel substrate (spots 20-24) (Figure 2a [4,8,13,14,18]. Hence, the Al 5 Fe 2 layer (spots [11][12][13][14][15][16][17][18][19] was thicker than the Al 13 Fe 4 layer (spots 7-10 inside the alloy layer) [10,11]. On the other hand, in the case of low-alloyed carbon steels, the characteristic finger-or tongue-like morphology that oriented along the c-axis of Al 5 Fe 2 generally developed at the coating/substrate interface [4][5][6]9,10,12,13].…”

Section: Resultsmentioning

confidence: 99%

“…Diverse aluminized coatings have been obtained by hot-dipping carbon steels in Al [5,7,12,13] and Al-Si molten baths [5,9], 5Cr-0.5Mo steels in Al [14] and Al-Si molten baths [16], and 9Cr-1Mo steels in Al-Si [17] and Al-Si-Mg molten baths [15]. They significantly enhanced the high-temperature oxidation and corrosion resistance of the underlying steels through forming α-Al 2 O 3 [5,7,9,[12][13][14]17,18], α-Al 2 O 3 + FeAl [6,15], and FeAl [16] layers. However, microstructural changes during high-temperature oxidation and the oxidation resistance of 9Cr-1Mo steels that were hot-dipped in the Al molten bath have not been adequately investigated before.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Changes of Al Hot-Dipped P91 Steel during High-Temperature Oxidation

Abro

Lee

2017

Coatings

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“…Currently, hot-dip technology is mainly used to prepare the Al and Al-Si alloys on steel surfaces. Moreover, the hot-dipped composition coating, which consists of Fe-Al and Fe-Al-Si intermetallic compound diffusion layers, and Al and Al-Si alloy metal layers, can be prepared to improve the high-temperature resistance, corrosion resistance, and wear resistance of the steel [17][18][19]. After hot-dipping Al and Al-Si on the surface of the steel, the obtained hot-dipped coating is in-situ oxidized to form an Al 2 O 3 -based ceramic coating by MAO, which further improves the high-temperature performance and wear resistance of steel [20,21].…”

Section: Introductionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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A composite coating composed of intermetallic compounds, Al–Si alloys, and an oxide ceramic layer was prepared on TA2 substrate by hot-dipping Al–Si alloy and micro-arc oxidation (MAO) methods. The microstructure and composition distribution of the resulting hot-dipped Al–Si alloy layer and MAO-caused ceramic layer were studied by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). In addition, the phase composition of the diffusion layer obtained by the Al–Si alloy hot-dipping procedure was investigated by electron backscattered diffraction (EBSD), and the phase structure of the MAO-treated layer was studied by X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The MAO method can make the hot-dipped Al–Si alloy layer in-situ oxidized to form a ceramic layer. Finally, a three-layer composite coating composed of a diffusion layer formed by the Ti–Al–Si interdiffusion, an Al–Si alloy layer and a ceramic layer was prepared on TA2 substrate. Compared with TA2 substrate, the TA2 sample with a three-layer composite coating has larger friction coefficient and less abrasion loss. The three-layer composite coating can significantly improve the wear resistance of TA2. A technical composite method was developed to the low cost in-situ growth of alumina-based ceramic wear-resistant coatings on TA2 substrate.

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Growth and surface morphology of hot-dip Al–Si on 9Cr-1Mo steel

Cited by 33 publications

References 29 publications

Diffusion and plasma oxidation mechanism of Fe–Al coatings

Diffusion and plasma oxidation mechanism of Fe–Al coatings

Microstructural Changes of Al Hot-Dipped P91 Steel during High-Temperature Oxidation

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

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