Abstract
Super 304H, HR3C and Sanicro 25 grade austenitic matrix steels are used in the construction of pressure components of boilers with supercritical operating parameters. The article presents the results of microstructure examination in delivery condition and after age-ing for up to 50,000 hours at 700°C. The microstructure exami-nation was performed using scanning and transmission electron microscopy. The precipitates were identified using transmission electron microscopy. In particular, the study analysed the v phase precipitation process and its dynamics depending on the ageing time. It has been shown that the intermetallic v phase plays a significant role in the loss of durability of the tested steel. It is related to its significant increase due to the influence of high temperature, and its coagulation and coalescence dynamics strongly depend on the ageing/operating temperature level. The qualitative and quan-titative identification of the intermetallic v phase precipitation pro-cess described in the study is important in the analysis of the loss of durability of the tested steels under creep conditions.
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