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The study was carried out to determine the effect of long-term ageing (1,000 and 10,000 hours) at 700°C and 750°C on the microstructure of the HR6W alloy. The study indicates that the long-term effect of high temperature causes significant changes in the microstructure of the examined alloy: • After ageing for 1,000 hours at 700°C, in addition to primary MX and M23C6 precipitations, an increase in the size and number of precipitates was observed both inside and along austenite grain boundaries, and the occurrence of the Laves phase was also observed. • After 10,000 hours at 700°C, a significant increase in M23C6 precipitates was observed, especially inside and along grain boundaries. An increase in the Laves phase in the microstructure was also observed. The effect of the increase in the ageing temperature to 750°C: • It significantly accelerated the precipitation process after just 1,000 hours. • In addition to a network of M23C6 precipitates along austenite grain boundaries, their coagulation and an increase in the size of the Laves phase precipitates inside the austenite grains was observed. • The extension of the ageing time to 10,000 hours at 750°C contributed to a significant increase in the size of Laves phase precipitates inside austenite grains.

INCREASED TEMPERATURE AND LONG-TERM IMPACT OF THE AGEING PROCESS ON CHANGES IN THE MICROSTRUCTURE OF THE HR6W ALLOY