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HOT TEARING OF A POLYCRYSTALLINE INDUSTRIAL TURBINE BLADE WITH TWO DIFFERENT NICKEL BASE SUPERALLOYS

1 SAGHAFI Ali Akbar
Co-authors:
1 YAKHKESHI Reza 1 MORADI Rahim
Institution:
1 Mapna Turbine Blade Engineering and Manufacturing (Parto), Casting Department, Karaj, Iran Saghafi.Aliakbar@mapnablade.com, Yakhkeshi.Reza@mapnablade.com, Moradi.Rahim@mapnablade.com
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1414-1420
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
501 views / 626 downloads
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Abstract

The effect of chemical composition on hot tearing susceptibility of a polycrystalline industrial gas turbine blade during casting process has been investigated. Five master melts from two different nickel base superalloys by nearly similar chemical composition have been used for this purpose. The results show that in IN738-LC alloy, hot tear sensitivity has a direct relation with Zr content, but in Rene80 the amount of Zr, doesn’t have any obvious effect on the hot tearing susceptibility of alloy. It could be related to lower HSC parameter in Rene80 alloy in comparison with that in IN738-LC. Besides the amount of Cr and Al which are the most segregating elements next to eutectic phase, in the IN738-LC are higher than that in Rene80 alloy.

Keywords: Turbine blade, investment casting, hot tear, Rene80, IN738LC

© 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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