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Isothermal Oxidatio...
Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718
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- Sadeghimeresht, Esmaeil, 1985- (author)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW,Department of Engineering Science, University West, Trollhättan, Sweden,Univ West, Sweden
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- Karimi Neghlani, Paria, 1986- (author)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW,Department of Engineering Science, University West, Trollhättan, Sweden,Univ West, Sweden
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- Zhang, Pimin (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Peng, Ru (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Andersson, Joel, 1981- (author)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Department of Engineering Science, University West, Trollhättan, Sweden,Univ West, Sweden
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- Pejryd, Lars, 1955- (author)
- Örebro universitet,Institutionen för naturvetenskap och teknik,Örebro University, School of Science and Technology, Örebro, Sweden,Örebro Univ, Sweden
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- Joshi, Shrikant V., 1960- (author)
- Högskolan Väst,Forskningsmiljön produktionsteknik(PTW),PTW,Department of Engineering Science, University West, Trollhättan, Sweden,Univ West, Sweden
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(creator_code:org_t)
- 2018-05-13
- 2018
- English.
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In: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives. - Cham : Springer. - 9783319894799 - 9783319894805 ; , s. 219-240
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https://doi.org/10.1...
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Abstract
Subject headings
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- Oxidation of Alloy 718 manufactured by electron beam melting (EBM) process has been undertaken in ambient air at 650, 700, and 800 °C for up to 168 h. At 800 °C, a continuous external chromia oxide enriched in (Cr, Ti, Mn, Ni) and an internal oxide that was branched structure of alumina formed, whereas at 650 and 700 °C, a continuous, thin and protective chromia layer was detected. The oxidation kinetics of the exposed EBM Alloy 718 followed the parabolic rate law with an effective activation energy of ~248 ± 22 kJ/mol in good agreement with values in the literature for conventionally processed chromia-forming Ni-based superalloys. The oxide scale formed on the surface perpendicular to the build direction was slightly thicker, and more adherent compared to the scale formed on the surface along the build direction, attributed to the varied grain texture in the two directions of the EBM-manufactured specimens. The increased oxygen diffusion and high Cr depletion found on the surface along the build direction were attributed to the fine grains and formation of vacancies/voids along this grain orientation.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Additive manufacturing
- Electron beam melting
- Alloy 718
- Oxidation behavior
- Grain texture
- Manufacturing and materials engineering
- Produktions- och materialteknik
- Production Technology
- Produktionsteknik
Publication and Content Type
- ref (subject category)
- kon (subject category)
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