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The study covered 9% Cr martensitic steels - X10CrMoVNb9-1 (P91) and X13CrMoCoVNbNB9-2-1 (PB2) after long-term ageing at the temperature of 620°C and soaking time up to 50,000 hours. The microstructural investigations of the tested steels were carried out using a TITAN 80-300 transmission electron microscope. The analysis of the changes in the microstructure included the identification of precipitates...
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