Precipitate microstructure evolution in low-cycle fatigued INCONEL superalloys

0389040 - ÚJF 2013 AU eng C - Konferenční příspěvek (zahraniční konf.)
Strunz, Pavel - Petrenec, Martin - Gasser, U. - Tobiáš, Jiří - Polák, Jaroslav - Šaroun, Jan
Precipitate microstructure evolution in low-cycle fatigued INCONEL superalloys.
SAS 2012 - Proceedings of the 15th International Small-Angle Scattering Conference. Sydney: SAS Conference, 2012 - (McGillivary, D.; Trewhella, J.; Gilbert, E.; Hanley, T.), P039-P039. ISBN 1-921268-15-8.
[15th International Small-Angle Scattering Conference. Sydney (AU), 18.11.2012-23.11.2012]
Grant CEP: GA ČR(CZ) GAP204/11/1453
Institucionální podpora: RVO:61389005 ; RVO:68081723
Klíčová slova: Ni-base superalloy * low-cycle fatigue * neutron diffraction
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
http://paperlessevent.com.au/SAS2012.zip

The critical parts of a turbine made of Ni-base superalloy are subjected to cyclic elasticplastic straining as a result of heating and cooling during start-up and shut-down periods. Consequently, low-cycle fatigue up to working temperature of 900°C is an important factor in the service life. It is connected with a change of microstructure of matrix and precipitates. Nickel base superalloy Inconel was studied after low-cycle fatigue by exand in-situ SANS. It was found that additional precipitation occurs at 700°C. The precipitates are created regardless the application of the mechanical load. Nevertheless, these small precipitates could influence low-cycle fatigue parameters, as indicated by the anomaly at the same temperature. The small (up to 10 nm at 700°C) precipitates are highly probably not a second population of γ´. Possible explanations are carbides or TCP phase. The limits of the precipitate phase temperature range were roughly determined.
Trvalý link: http://hdl.handle.net/11104/0217990