Abstract
The article presents the results of investigations of the microstructure and mechanical properties of austenitic, creep-resistant TP347HFG steel in delivery condition and after operation at 585 °C. As-received, the tested steel is characterised by an austenitic structure with twins and NbX precipitates. The conducted studies showed that the operation resulted in precipitation processes, mainly at grain boundaries, where M23C6 carbides and σ phase precipitates were observed. Single M23C6 particles were visible at twin boundaries. NbX precipitates were observed inside the grains. After operation, the yield strength (YS) of the tested steel was lower than in delivery condition, which was related to the over-ageing of the alloy. The fine-grained microstructure and the presence of relatively numerous twins in the steel structure allowed maintaining relatively good plastic properties and impact energy.
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