Page 136 - Fluid Mechanics and Thermodynamics of Turbomachinery

Axial-flow Turbines: Two-dimensional Theory 117
6

Molybdenum alloys
Nickel alloys
4

s max /r m 10 4 ´m 2 /s 2 Aluminum alloys

2

Cobalt alloys

0 500 1000 1500
K
FIG. 4.17. Maximum allowable stress for various alloys (1000 hr rupture life) (adapted
from Freeman 1955).

8

100 hr Creep
1000 hr

6 1,000 100

Ultimate
10,000
s ´ 10 8 , Pa 4 10 hrs

0.2%
1%
2

0
900 1000 1100 1200 1300 1400
FIG. 4.18. Properties of Inconel 713 Cast (adapted from Balje 1981).