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- W2271640119 abstract "In this study, a casting simulation system is employed to predict the occurrence of porosity defects for a nozzle segments investment casting of René 77 alloy under specific designs. Castings of the same designs are then actually cast and the conditions of porosity formation are examined and compared to the simulated results.The casting under investigation is a 6-vane turbine multi-nozzle segment with item dimensions of 230mmL * 180mmH * 51mmW. Two designs for the casting are investigated. The first design is a top pouring gating system with two symmetric castings, inward trailing edge (TE) direction, upward outer shroud direction, 9 mm of shell thickness, pouring temperature of 1440 °C, and wrapping the mold from the bottom of airfoils to the pouring cup by 6.35 mm thick insulation. The second design, having the same designs of TE and outer shroud directions as well as shell thickness as the first design, uses a high emissivity material on the inner shroud area in conjunction with the top pouring method, pouring temperature of 1425 °C, and two layers of insulation which wrap the mold from the bottom of airfoils to the pouring cup and from the mid-section of airfoils to the pouring cup by 6.35 mm thick insulation, respectively.The first design is predicted to have macroporosity formed in several locations of the casting. It is rather consistent with the porosity defects found in the actual casting. The second design is predicted to be free from macroporosity and have minor amounts of microporosity. It is also confirmed by the actual casting." @default.
- W2271640119 created "2016-06-24" @default.
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- W2271640119 date "2003-03-01" @default.
- W2271640119 modified "2023-09-24" @default.
- W2271640119 title "Computer simulation for the investment casting of rené 77 alloy and its experimental verification" @default.
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- W2271640119 doi "https://doi.org/10.1080/13640461.2003.11819507" @default.
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