Abstract
HR3C steel is a new type of austenitic heat-resistant steel which has been widely used for super- heater and re-heater tubes in the ultra-supercritical (USC) boiler. The mechanical properties of HR3C steel were de- pendent on the stability of the microstructure, particularly the large amount of precipitates formed during service. The precipitation of s phase in HR3C steel during long-term aging for 2000 h at temperature of 700 and 750 ℃ was investigated by OM, SEM and TEM. The phase calculation method was applied to understand the factors in- fluencing the precipitation. After 1000 h of the aging duration, irregular mass second phase was found to pre- cipitate at the grain boundary, followed by the subsequent increasing and coarsening with time. The constituent ele- ments of the phases were determined as Fe and Cr through SEM equipped with EDS. Further SAED analysis re- sults led to the confirmation that these phases were basically s-FeCr compound. Combined with the prediction made through New PHACOMP method, the microstructure or phase structure in initial state may affect the subse-
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