Abstract
In this study, the microstructures of the three principal heat-affected zones (HAZs) of the P91 steel weld joint were simulated using appropriate heat treatments at different soaking temperatures ranging from 865 °C to 1200 °C. Low cycle fatigue tests were conducted on the samples of each microstructural zone of the weld joint at 550 °C employing a constant strain amplitude of ±0.6% and strain rate of 3 × 10−3 s−1. In the weld joint’s microstructures, the weld metal exhibits the lowest fatigue life, followed by the inter-critical (IC). However, the actual weld joint specimen failed at the interface between the ICHAZ and the base metal.
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