Previous study carried out creep analysis for steam generator high-temperature-section two components, outflow tubing and manifold of the superheater harp: they may have been critical because of the long continued service (109,000 hours or twelve years) and loading conditions, including maximum operation temperature (565°C) and applied stress (65 MPa). Metallographic methods by replica had showed no evidence of the creep cavitation in all the positions considered for both tubing and manifold. In particular, they had not found any cavitation or phases affecting creep strength of the material in the base, HAZ and weld metal microstructure. Now, present study carries out investigation for the two components based on the next plant outage outcome, after further 20,000-hours service. Both metallographic methods and hardness measurements' results would compare with previous ones providing microstructure evolution in the period.
Steam generator grade P91 steel components creep-assessment by test after extended service / Scano O.G.L.; Piccini F.; Conte A.L.; De Agostinis M.; Fini S.. - ELETTRONICO. - 1:(2021), pp. V001T01A062.1-V001T01A062.17. (Intervento presentato al convegno ASME 2021 Pressure Vessels and Piping Conference, PVP 2021 tenutosi a Virtuale nel 13-15 luglio 2021) [10.1115/PVP2021-60160].
Steam generator grade P91 steel components creep-assessment by test after extended service
De Agostinis M.;Fini S.
2021
Abstract
Previous study carried out creep analysis for steam generator high-temperature-section two components, outflow tubing and manifold of the superheater harp: they may have been critical because of the long continued service (109,000 hours or twelve years) and loading conditions, including maximum operation temperature (565°C) and applied stress (65 MPa). Metallographic methods by replica had showed no evidence of the creep cavitation in all the positions considered for both tubing and manifold. In particular, they had not found any cavitation or phases affecting creep strength of the material in the base, HAZ and weld metal microstructure. Now, present study carries out investigation for the two components based on the next plant outage outcome, after further 20,000-hours service. Both metallographic methods and hardness measurements' results would compare with previous ones providing microstructure evolution in the period.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
