Ceramic Filter Effect on Surface Defects in Nickel Based Superalloy

M.R. Alizadeh¹ , Y. Miladi² , M. Naseri³ , A.M. Kolagar⁴

1. MavadKaran Engineering Company, Mapna Group, Tehran, Iran.
2. MavadKaran Engineering Company, Mapna Group, Tehran, Iran.
3. MavadKaran Engineering Company, Mapna Group, Tehran, Iran.
4. MavadKaran Engineering Company, Mapna Group, Tehran, Iran.

Section:Research Paper, Product Type: Journal-Paper
Vol.10 , Issue.1 , pp.14-18, Mar-2023

Online published on Mar 31, 2023

Copyright © M.R. Alizadeh, Y. Miladi, M. Naseri, A.M. Kolagar . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Surface defects are common defects in casting process and directly related to the purity of molten metal and using ceramic filter. In fact, producing a part in investment casting free of any defects is almost implausible. These defects are usually displayed as cluster or star at nights defects on surface of casting part and finally may lead the part to be rejected. In this study the effects of ceramic filter on reduction of surface defects in nickel based superalloy gas turbine blade has been studied. The mesh of filter was 10 ppi, and its thickness was 20 mm with two diameters of 40 and 70 mm for gate and cup filter respectively. To comparison of surface defects content, another ceramic mold without ceramic filter into the gate in vacuum induction melting furnace and with same casting condition was poured at 1420°C. After casting, fluorescent penetrant inspection was applied on each blade and also surface grain size of the blades was compared with each other. The results show that when ceramic filter is used into the gate, the surface defects are 4 times less. In addition, those blades that poured with filter had finer grain size. The reason for finer gran size can be related to the better temperature distribution in the mold.

Key-Words / Index Term :
Surface Defects, Ceramic Filter, Investment Casing, Nickel Based Superalloy.

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