Abstract
Investigations have been carried out to study the crack growth behaviour in type 308 Cb stainless steel weld metal under constant load creep conditions in the temperature range of 600°C to 800°C. At 600°C the load point deflection (LPD) rate is proportional to the creep crack growth (CCG) rate. At 700°C and 800°C it is dependent on both crack growth rate and the applied load. The parameter C* appears to describe well the CCG rate. At 600°C the crack growth takes place along the interphase between austenite and the primary arms of the delta ferrite. At 700°C and 800°C sigma phase formation takes place and the crack growth is through the interphase between austenite and sigma phase.
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