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Wysokochromowe stale martenzytyczne na wirniki turbin parowych do pracy w blokach energetycznych na parametry nadkrytyczne

Furmanek Joanna, Dobrzański Janusz, Purzyńska Hanna

Energetyka

2023

nr 11

646--648

Przedstawiono wyniki badań struktury i właściwości wytrzymałościowych stali X12CrMoWVNbN10-1-1 i 9Cr-1,5Mo-1Co-0,3V-NbBN (FB2) stosowanych na wirniki turbin eksploatowanych przy parametrach nadkrytycznych. Dokonano również ich porównania z właściwościami dla stali P92.

The results of tests on the structure and strength properties of steel at room and elevated temperatures, including creep strength, X12CrMoWVNbN10-1-1 and 9Cr-1.5Mo-1Co-0.3V-NbBN (FB2) steels for turbine rotors for supercritical operation are presented and compared with those for P92 steel.

Quantitative analysis of stability of 9%Cr steel microstructure after long-term ageing

Golański G., Jasak J., Zieliński A., Kolan C., Urzynicok M., Wieczorek P.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 1

263--271

The paper presents the results of research on the microstructure of martensitic X10CrMoVNb9-1 (P91) and X13CrMoCo- VNbNB9-2-1 (PB2) steel subject to long-term ageing at the temperature of 620°C and holding times up to 30 000 hours. The microstructural tests of the examined steel types were performed using a scanning microscope Joel JSM - 6610LV and a transmission electron microscope TITAN 80 - 300. The stability of the microstructure of the investigated steels was analyzed using a quantitative analysis of an image, including measurements of the following: the density of dislocations inside martensite/subgrain laths, the width of martensite laths, and the mean diameter of precipitates. It has been concluded that during long-term ageing, the microaddition of boron in PB2 steel significantly influenced the slowing of the process of degradation of the martensitic steel microstructure, as a result of slowing the process of coagulation of M23C6 carbides and Laves phase. It had a favorable effect on the stabilization of lath microstructure as a result of retardation of the processes of recovery and polygonization of the matrix.