ESTIMATION OF CREEP CRACK-GROWTH RATE IN IN-100 BASED ON THE Q-ASTERISK PARAMETER CONCEPT

Since the high-strength Ni-based superalloy, cast IN-100, is considere d to be brittle at high temperatures, the stable creep crack growth re gion is limited. Therefore, technically, it is very difficult to perfo rm creep tests and there are few experimental results on the creep cra ck growth behaviour of this material. We performed creep crack growth tests using Ni-based superalloy, cast IN-100, and derived the Q param eter for this material, which characterizes the creep crack growth rat e. Using this Q parameter, we derived a law for the creep rupture lif e of this material. (C) 1998 Chapman & Hall.