Martensitic heat-resistant steel P92 belongs to very progressive group of 9-12% Cr steels modified with vanadium and niobium, with controlled boron and nitrogen content. P92 has got excellent creep properties and it is used very often to build the most exposed parts of supercritical units in steam power plants.The goal of this article is to compare the real welded joints with the simulated samples and to optimize the heat treatment and welding process of P92 steel. For that analysis of the microstructure with transmission electron microscopy was made. The measurement of trend of hardness along the welded joint was carried out, as well. The good accordance between the simulated samples and real welded joints were found.Keywords: Thermal cycles simulator; steel P92; microstructure; heat-affected zone
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