Kamaraj M

Creep crack growth behavior of type 308 Cb austenitic stainless steel and its weldment has been studied in the temperature range of 875 to 1075 K under plane stress condition. The creep crack growth (CCG) rate has been correlated with parameters like stress intensity factor, K, net section stress and energy rate line integral C*. Among these parameters C* appears to describe well the CCG rate in both the cases of base metal and weldment. The rupture time tr of the cracked material has been found to be related to the energy rate line integral C*s in the steady-state condition, given by a relation of the type C*s · tr = constant. © 1991 by ASME.

Experimental investigations have been carried out to study the creep crack growth in types 316, 308 Cb, and 304 L stainless steel in the temperature range of 873-1073 K under plane stress condition. Testings have been carried out with both the base metal and the welded composite joints, because such joints are commonly used in nuclear power industries. Among the various parameters tried to correlate the creep crack growth, the energy rate line integral has been found to give the best description of the crack growth rate. The steady-state energy rate line integral has been found to correlate well with the rupture time. Based on this observation, life estimations are presented for thin components containing various initial defect sizes. © 1991 by ASME.

Experimental investigations have been carried out on the creep crack growth behaviour in types 316, 308 Cb and 304 L stainless steels under a plane stress condition. The crack initiation starts at the second half of the steady state deformation of the material in all the cases. It has been observed that the rupture time (tr) bears an inverse relation to the steady state energy rate line integral, C*, in the form of C*str = R where Cs* is that value of the energy rate line integral in the steady state condition and R is a constant. © 1990.