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- W2275107809 abstract "Manufactured single crystal components using Ni-base super alloys are routinely used in the hot sections of aero engines and industrial gas turbine s due to their outstanding high temperature strength, toughness and resistance to degradation i n corrosive and oxidative environments. To control the quality of the single crystal turbine b lades, particular attention has been paid to grain selection, which is used to obtain the single cryst al morphology from a plethora of columnar grains. For this purpose, different designs of grain select ors are employed and the most common type is the spiral grain selector. A typical spiral grain selec tor includes a starter block and a spiral (helix) located above. It has been found that the grains wi th orientation well aligned to the thermal gradient survive in the starter block by competitive grain g rowth while the selection of the single crystal grain occurs in the spiral part. In the present stu dy, 2Dspiral selectors with different geometries were designed and produced using a state-of-the-art Bridgeman Directional Solidification casting furnace to investigate the competitive growth durin g grain selection in 2d grain selectors. The principal advantage of using a 2-Dselector is to fa cilitate the wax injection process in investment casting by enabling significant degree of automatio n. The directional solidification process for obtaining single crystal component for Nickel Super alloys based on the competitive growth in 2D and 3D single crystal grain selector was experiment ally investigated for various geometries. Transverse sections of the grain selectors using op tical and EBSD microscopy techniques were observed to understand the competitive grain growth process." @default.
- W2275107809 created "2016-06-24" @default.
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- W2275107809 date "2015-02-01" @default.
- W2275107809 modified "2023-09-26" @default.
- W2275107809 title "Characterization and Investigation of Grain Selection in Spiral Grain Selectors during Casting Single-Crystal Turbine Blades" @default.
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