Institute of Physics of Materials AS CR, v. v. i. > Projects > Solutions of materials and technological innovations of new generation power and chemical plants operating at high temperatures
Solutions of materials and technological innovations of new generation power and chemical plants operating at high temperatures
| Co-investigator | prof. Ing. Václav Sklenička, DrSc. |
| Number of Project | 2A-1TP1/057 |
| Duration | 2005-12-31 - 2011-12-30 |
Anotace |
| Creep behaviour of selected advanced power plant steels after long-term isothermal ageing has been studied with the aim to model the creep-stregth degradation of these creep-resistant steels which occurs under operating conditions. In order to accelerate some microstructural changes and thus to simulate degradation processes in long-term service, isothermal ageing at 600°C for 10 000 h was applied to P91, P92 and P23 steels in their as-received states. Creep tests were performed at 600 and 650°C at applied tensite stresses ranged from 50 to 400 MPa. Creep tests were followed by microstructure investigations by means of TEM and SEM electron microscopy and by the thermodynamic calculations. The applicability of the creep tests was verified by the theoretical modelling of the phase equilibrium at different temperatures. It was suggested that the main detrimental process in the long-term degradation of the creep strength is microstructure instability of steels under investigation. |
