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
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