1. Nickel based alloys of the Ni plus 5% Cr plus 9% Co plus 12% W plus 1% Mo type with an equiaxial structure are more sensitive to nonferrous metal impurities than are alloys that are cast with a controlled structure. This effect is due to the structure formation characteristics for these alloys.
The most adverse effect is that due to impurities on the formation of a composite structure when the eutectic alloys are cast: the plane crystallization front loses stability due to concentrational supercooling and a cellular structure is formed, which results in a significant fall in the durability.
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Sidorov, V.V., Kulebyakina, A.M. Influence of nonferrous metals impurities on the structure and high temperature strength of nickel based foundry alloys. Met Sci Heat Treat 34, 241–246 (1992). https://doi.org/10.1007/BF00702542
- Composite Structure
- Control Structure
- Cellular Structure