Experimental investigation of creep crack growth for two high temperature alloys

The investigations show that the creep crack growth rate can be determined continuously with the single specimen partial unloading compliance technique and with the direct current potential drop technique with similar accuracy for temperatures up to 900 degrees C and testing times up to nine months so far. For compact and centre notched tension specimens the creep crack growth rates can be correlated to the loading parameter C-integral for the two materials X 6 Cr Ni 18 11 (similar to A 304 ss) and X 10 Ni Cr Al Ti 32 20 (Incoloy 800 H). (IWM)