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Modeling of the mic...
Modeling of the microstructural evolution and lifetime prediction of MCrAlX coatings on Nickel based superalloys in high temperature oxidation
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- Yuan, Kang (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Eriksson, Robert (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Peng, Ru (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Li, Xin-Hai (author)
- Siemens Industrial Turbomachinery AB, Finspång
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- Johansson, Sten (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Wang, Yandong (author)
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China
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(creator_code:org_t)
- Elsevier, 2013
- 2013
- English.
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In: Surface and Coatings Technology. - : Elsevier. - 0257-8972. ; 232:15, s. 204-215
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https://liu.diva-por... (primary) (Raw object)
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http://liu.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- At high temperature, MCrAlX coatings are deposited onto the surface of superalloy to provide oxidation and corrosion protection by forming a thermalgrowing oxide scale. In this project, the oxidation behavior of an HVOF CoNiCrAlYSi coating on IN792 was studied in both isothermal oxidation (900, 1000 and 1100 °C) and thermal cycling (1100-100 °C). The microstructural evolution in the MCrAlX coatings after oxidation was investigated. It was found that Al-rich β phase is gradually consumed due to two effects: surface oxidation and coating-substrate interdiffusion. Some voids and oxides along the coating-substrate interface, or inside the coating, were considered to play a role in blocking the diffusion of alloying elements. Based on the microstructural observation, an oxidation-diffusion model was developed by using Matlab and DICTRA software to predict the lifetime of MCrAlX coatings. Several effects influencing the microstructural evolution were included: surface oxidation, coating-substrate interdiffusion and diffusion blocking. The results showed good agreement between the experimental composition profiles and modeling ones. Furthermore, by choosing suitable diffusion blocking factors, the accuracy of coating life prediction could be improved.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- MCrAlX coating; HVOF; Life prediction; Interdiffusion; Oxidation; Diffusion blocking
Publication and Content Type
- ref (subject category)
- art (subject category)
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