Abstract
Low cycle fatigue tests were conducted on theweld metal, coarse grain heat-affected zone (CGHAZ), fine grain heat-affected zone (FGHAZ), inter-critical heat-affected zone (ICHAZ), base metaland the actual weldmentof P91 steelat 550 °C using different strain amplitudes.The P91 weldment and its constituent microstructural regions exhibited typical continuous cyclic softening behavior. In the HAZs, the FGHAZ exhibited better fatigue behavior. The CGHAZ and ICHAZ showed higher fatigue lives at the lower and higher strain amplitudes, respectively. An empirical relationship was established for predicting the fatigue life of the weldment using weighted factors of all the constituent regions.
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