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The solidification of the alloy ASTM F-75 ends with sigma phase formation instead of M 7 C 3 carbide as presumed from literature. The M 23 C 6 carbide observed in cast specimens precipitates from the sigma phase (σ) according to the global reaction σ+C->M 23 C 6 over the range 1403-1303 K. Additionally, lamellar carbides appear below 1262...
The solidification process of a new cast Ni-base superalloy containing 3 wt.% Ru and high W content was investigated and compared with a Ru-free superalloy. The results show that Ru is a microstructure stabilizer for high W superalloy due to its retarding effect on the formation of harmful large blocky M 6 C carbides. Another Ru effect is to change the phase precipitation temperatures between...
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