Role of Rhenium in Single Crystal Ni-Based Superalloys
The effect of rhenium on the microstructure and mechanical properties of single crystal superalloys with a nominal composition of Ni-3Cr-12Co-1Mo-6W-6Al-8Ta-0.1Hf-(0, 2, 4) Re has been studied. With the rise of rhenium content, the size of as-cast particles becomes smaller. Rhenium addition elevates the incipient melting temperature and slows down the solid solution process. Even after 2000h prolonged aging both at 950°C and 1050°C, no topologically close-packed phase precipitation is found in the three alloys with Re content up to 4%. Re retards the coarsening and is beneficial to improving the stress rupture life. The deformation mechanisms together with the dislocation configuration have been studied and discussed.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
T. Jin et al., "Role of Rhenium in Single Crystal Ni-Based Superalloys", Materials Science Forum, Vols. 638-642, pp. 2257-2262, 2010