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Surface Integrity a...
Surface Integrity and Structural Stability of Broached Inconel 718 at High Temperatures
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- Chen, Zhe (author)
- Linköping University,Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Peng, Ru Lin (author)
- Linköping University,Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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- Moverare, Johan (author)
- Lund University,Lunds universitet,Linköping University,Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan,Industriell Produktion,Institutionen för maskinvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Production and Materials Engineering,Department of Mechanical Engineering Sciences,Departments at LTH,Faculty of Engineering, LTH
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- Avdovic, P. (author)
- Siemens Industrial Turbomachinery AB, Finspång, Sweden
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- Zhou, Jinming (author)
- Division of Production and Materials Engineering, Lund university
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- Johansson, Sten (author)
- Linköping University,Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan
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(creator_code:org_t)
- 2016-04-22
- 2016
- English.
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In: Metallurgical and Materials Transactions. A. - : Springer. - 1073-5623 .- 1543-1940. ; 47A:7, s. 3664-3676
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http://dx.doi.org/10...
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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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- The current study focused on the surface integrity issues associated with broaching of Inconel 718 and the structural stability of the broached specimen at high temperatures, mainly involving the microstructural changes and residual stress relaxation. The broaching operation was performed using similar cutting conditions as that used in turbo machinery industries for machining fir-tree root fixings on turbine disks. Thermal exposure was conducted at 723 K, 823 K, and 923 K (450 A degrees C, 550 A degrees C, and 650 A degrees C) for 30, 300, and 3000 hours, respectively. Surface cavities and debris dragging, sub-surface cracks, high intensity of plastic deformation, as well as the generation of tensile residual stresses were identified to be the main issues in surface integrity for the broached Inconel 718. When a subsequent heating was applied, surface recrystallization and alpha-Cr precipitation occurred beneath the broached surface depending on the applied temperature and exposure time. The plastic deformation induced by the broaching is responsible for these microstructural changes. The surface tension was completely relaxed in a short time at the temperature where surface recrystallization occurred. The tensile layer on the sub-surface, however, exhibited a much higher resistance to the stress relief annealing. Oxidation is inevitable at high temperatures. The study found that the surface recrystallization could promote the local Cr diffusion on the broached surface.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- Structural integrity
- Broaching
- Inconel 718
- Plastic deformation
- Residual stresses
- Thermal exposure
- Superalloy
Publication and Content Type
- ref (subject category)
- art (subject category)
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