Mechanical Properties of Cast & Wrought Pancakes Using New Ni-Co Base Disk Superalloys

New kinds of cast and wrought (C & W) Ni-Co base superalloys (TMW alloys) have been developed based on the innovative concept of combining two kinds of gamma-gamma' two phase alloys, Ni-base and Co-base alloys, for the applications of turbine disks and high pressure compressor blades. The results based on testing 20 kg ingots indicate that TMW alloys show excellent high temperature strength and formability, may provide 50 degrees C temperature advantage in 630 MPa/100 h creep performance over C & W alloy U720Li. In this paper, we report our new results on the full scale pancakes manufactured through the C & W process for real components. The results indicate that TMW alloys had good process ability in the ingot making and forging into disk pancakes. Pancake disks with fine grain size of about 10 mu m were successfully obtained for TMW alloys. TMW alloys provide 58 degrees C to 76 degrees C temperature advantages in 0.2% creep strain life under the 630 MPa condition, over alloy U720Li.