0425766 - ÚJF 2015 RIV CH eng J - Článek v odborném periodiku
Strunz, Pavel - Petrenec, Martin - Gasser, U. - Tobiáš, Jiří - Polák, Jaroslav - Šaroun, Jan
Precipitate microstructure evolution in exposed IN738LC superalloy.
Journal of Alloys and Compounds. Roč. 589, MAR (2014), s. 462-471. ISSN 0925-8388. E-ISSN 1873-4669
Grant CEP: GA ČR(CZ) GAP204/11/1453; GA MŠMT(XE) LM2011019
GRANT EU: European Commission(XE) 283883 - NMI3-II
Institucionální podpora: RVO:68081723 ; RVO:61389005
Klíčová slova: metals * precipation * scanning and transmission electron microscopy * high temperature alloys * neutron scattering
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus; JL - Únava materiálu a lomová mechanika (UFM-A)
Impakt faktor: 2.999, rok: 2014

Nickel base superalloy IN738LC has been studied after low-cycle fatigue by Small Angle Neutron Scattering (SANS). Samples subjected to high-temperature low-cycle fatigue were annealed at various temperatures to change the size and the distribution of precipitates. Ex and in situ SANS and TEM studies were performed. It was found that additional precipitates are formed either during slow cooling from high temperatures or after reheating above 570 degrees C. Their size and distribution were evaluated. The precipitates arise regardless the application of the mechanical load. Nevertheless, these small precipitates influence low-cycle fatigue resistance. From the SANS data, it can be also deduced that the equilibrium volume fraction of gamma'-precipitates at temperatures from room temperature to 825 degrees C is significantly higher than 45%. The kinetics of formation of small and medium-size gamma' precipitates at 700 and 800 degrees C was determined as well. (C) 2013 Elsevier B.V. All rights reserved.
Trvalý link: http://hdl.handle.net/11104/0231561