Creep Behaviour of Advanced Power Plant Steels after Long-Term Isothermal Ageing Steels

0359240 - ÚFM 2012 RIV US eng C - Conference Paper (international conference)
Sklenička, Václav - Kuchařová, Květa - Svoboda, Milan - Kroupa, Aleš
Creep Behaviour of Advanced Power Plant Steels after Long-Term Isothermal Ageing Steels.
Advances in Materials Technology for Fossil Power Plants. Materials Park, Ohio: ASM International, 2011 - (Gandy, D.; Shingledecker, J.; Viswanathan, R.), s. 516-529. ISBN 978-1-61503-724-7.
[International Conference on Advances in Materials Technology for Fossil Power Plants /6./. Santa Fe, New Mexiko (US), 31.08.2011-03.09.2011]
R&D Projects: GA MPO 2A-1TP1/057
Institutional research plan: CEZ:AV0Z20410507
Keywords : creep * microstructural examination * thermodynamic calculation
Subject RIV: JJ - Other Materials

In this paper we tried to model the creep-strength degradation of selected advanced creep resistant steels which occurs under operating conditions. In order to accelerate some microstructure changes and thus to simulate degradation processes in long-term service, isothermal ageing at 650°C for 10 000 h was applied to P91, P92 and P23 steels in their as-received states. The tensile creep tests were performed at temperature 600°C in argon atmosphere on all steels both in the as-received state and after isothermal ageing, in an effort to obtain a more complete description of the role of microstructure stability in high temperature creep of these steels. Creep tests were followed by microstructure investigations by means of transmission and scanning 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.
Permanent Link: http://hdl.handle.net/11104/0197061