Nickel@ based superalloy for directionally solidified gas turbine blade

摘要

The alloy (I) has a microstructure obtd. by pptn.-hardening with a gamma matrix lattice and with gamma pptn. which are contained in them and which are almost completely dissolved in the matrix by soln. annealing before pptn. hardening. (I) has compsn. as follows 11.0-15.0 (wt.%) Cr, 2.0-11.0 Co, 3.5-10.0 W, 3.0-5.5 Al, 0.8-3.5 Ti, 4.0-9.0 Ta, 0-03 Mo, 0-0.05 Zr, 0-0.05 B, 0.01-0.15 C, and a balance of Ni. The Ta content is 1.5 times higher than the Ti content. The alloy esp. comprises 11.8-13.0 Cr, 5.0-10.0 Co, 5.5-6.3 W, 3.9-4.4 Al, 1.7-2.2 Ti, 6.4-7.0 Ta, 0-2 Mo, 0-0.03 Zr, 0.005-0.03 B, and 0.02-0.10 C.