Microstructure studies of an aluminide coating on 9Cr-1Mo steel during high temperature oxidation

Chang, Yo-Yu; Tsaur, Charng-Cheng; Rock, James C.

doi:10.1016/j.surfcoat.2005.11.038

Cited by 120 publications

(71 citation statements)

References 14 publications

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“…Hence, the high-temperature oxidation resistance of 9Cr-1Mo steels needs to be improved through surface modification techniques. Aluminum hot-dipping is a simple, cost-effective coating technique that could form the compact, slow growing, protective alumina scale in reaction with oxygen at high temperatures [4][5][6][7][8][9][10][11][12][13][14][15]. It also improves the surface hardness by forming Al-Fe intermetallics [5,7,9,13].…”

Section: Introductionmentioning

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%

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

Abro

Lee

2017

Coatings

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Abro

Lee

2017

Coatings

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“…Common intermetallic compounds used today are Al 2 Ti, Al 3 Ti, Al 3 Fe, AlNi 3 , FeCrAlY, TiC, TiN and Cr 23 C 6 (Sikka et al, 1993;Benci et al, 1995;Li et al, 1997;Han and Xing, 1997;Sun et al, 2009;Dai et al, 2012;Khina and Kulak, 2013;Deng et al, 2014). The aluminides generally are applied on steel surfaces for applications in the electric power industry, petrochemical industry and other energy conversion systems due to their low cost and excellent performance (Kobayashi and Yakou, 2002;Chang et al, 2006;Wang and Chen, 2006).…”

Section: Introductionmentioning

confidence: 99%

Formation of abrasion-resistant coatings of the AlSiFe<sub>x</sub>Mn<sub>y</sub> intermetallic compound type on the AISI 304L alloy

et al. 2016

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ABSTRACT:The α-Al 9 FeMnSi and β-Al 9 FeMn 2 Si intermetallics formed by reactive sintering of Al, Si, Mn, Fe, Cr and Ni powders have been used in AISI 304L steels to enhance microhardness. Processing variables of the reactive sintering treatment were temperature (600, 650, 700, 750 and 800 °C), pressure (5, 10 y 20 MPa) and holding time (3600, 5400 y 7200 seconds). Experimental results show that temperature is the most important variable affecting the substrate/coating formation, while pressure does not appear to have a significant effect. The results show the optimum conditions of the reactive sintering that favor the substrate/coating formation are 800 °C, 20 MPa and 7200 seconds. Under these conditions, the reaction zone between the substrate and coating is more compacted and well-adhered, with a microhardness of 1300 Vickers. The results of SEM and X-Ray diffraction confirmed the formation of α-Al 9 FeMnSi and β-Al 9 FeMn 2 Si intermetallics in the substrate/coating interface as well as the presence of Cr and Ni, indicating diffusion of these two elements from the substrate to the interface. RESUMEN: Formación de recubrimientos resistentes a la abrasión de compuestos intermetálicos del tipo AlSiFe x Mn y sobre la aleación AISI 304L.Los intermetálicos α-Al 9 FeMnSi y β-Al 9 FeMn 2 Si formados por sinterización reactiva de polvos Al, Si, Mn, Fe, Cr, Ni se han utilizado en aceros AISI 304L para mejorar la microdureza. Las variables de procesamiento de sinterización reactiva fueron temperatura (600, 650, 700, 750, y 800 °C), presión (5, 10 y 20 MPa) y el tiempo de retención (3600, 5400 7200 segundos). Los resultados experimentales muestran que la temperatura es la variable más importante que afecta a la formación del sustrato/recubrimiento, mientras que la presión no parece tener un efecto significativo una influencia significativa. Los resultados muestran las condiciones óptimas de la sinterización reactiva que favorecen la formación del sustrato/recubrimiento a 800 °C, 20 MPa y 7200 segundos. En estas condiciones, la zona de reacción entre el sustrato y el recubrimiento es más compacta y bien adherida, con microdureza de 1300 Vickers. Los resultados de MEB y DRX confirman la formación de intermetálicos α-Al 9 FeMnSi y β-Al 9 FeMn 2 Si en la interfase sustrato/ recubrimiento, así como la presencia de Cr y Ni, indicando la difusión de estos dos elementos del sustrato a la interfaz.

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“…Such good corrosion protection was attributed to the formation of the α-Al 2 O 3 scale on the surface through the reaction of the Al-rich topcoat with the oxygen impurity in Ar/0.1%H 2 S and Ar/1%SO 2 gas. It is noted that Al readily reacts with oxygen to form the highly stable α-Al 2 O 3 at high temperatures [12,13]. In EDS line profiles shown in Figs.…”

Section: Resultsmentioning

confidence: 95%

Corrosion of Carbon Steel with and without Aluminized Coating in (O, S, H)-containing Gases at 500-800℃

Lee¹,

Abro²,

Lee³

et al. 2017

Journal of the Korean institute of surface engineering

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Microstructure studies of an aluminide coating on 9Cr-1Mo steel during high temperature oxidation

Cited by 120 publications

References 14 publications

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

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

Formation of abrasion-resistant coatings of the AlSiFe<sub>x</sub>Mn<sub>y</sub> intermetallic compound type on the AISI 304L alloy

Corrosion of Carbon Steel with and without Aluminized Coating in (O, S, H)-containing Gases at 500-800℃

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