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Quasicrystals in 11Cr-3W-3Co Steel
Výrostková, A. ; Svoboda, Milan ; Ševc, P. ; Janovec, J. ; Grabke, H. J.
The microstructural and phase analysis after relaxation strength tests performed at 480, 540 and 570 °C of 10Cr3WVNbB steel TAF 650 and after long term ageing at 480 and 600 °C of 10Cr1Mo1WVNbN steel were carried out. Laves phase in TAF 650 can be denoted as Fe2W type and in the 10Cr1Mo1WVNbN steel as Fe2Mo type Quasicrystalline phase of the same chemical composition as Laves phase was found in TAF 650 steel in all states examined.
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Creep Resistance and Microstructural Stability of TAF 650 Steel
Svoboda, Milan ; Fejfarová, Ivana ; Kroupa, Aleš ; Sklenička, Václav ; Mayer, K. H.
The quantification of the particles of M23C6 and Laves phase in TAF 650 steel by means of image analysis and thermodynamic calculation of the amount of equilibrium phases were performed. It is shown that the growth rate of Laves phase is substantially higher than that of M23C6 carbide. The total area occupied by Laves phase precipitates represents 52.1 % of all particles area after creep (5888h, 100 MPa, 650 °C). The equilibrium amount of secondary phases calculated by THERMO-Calc is in good agreement with experimental results.
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