000171851 001__ 171851
000171851 005__ 20240711092306.0
000171851 0247_ $$2Handle$$a2128/8039
000171851 0247_ $$2ISSN
000171851 020__ $$a978-3-89336-986-7
000171851 037__ $$aFZJ-2014-05408
000171851 041__ $$aGerman
000171851 1001_ $$0P:(DE-Juel1)144244$$aSeibel, Thomas$$b0$$eCorresponding Author$$gmale$$ufzj
000171851 245__ $$aEinfluss der Probengröße und der Kornorientierung auf die Lebensdauer einer polykristallinen Ni-Basislegierung bei LCF- Beanspruchung
000171851 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2014
000171851 300__ $$aII, 131 S.
000171851 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s171851
000171851 3367_ $$02$$2EndNote$$aThesis
000171851 3367_ $$2DRIVER$$adoctoralThesis
000171851 3367_ $$2BibTeX$$aPHDTHESIS
000171851 3367_ $$2DataCite$$aOutput Types/Dissertation
000171851 3367_ $$2ORCID$$aDISSERTATION
000171851 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v227
000171851 502__ $$aRWTH Aachen, Diss., 2014$$bDr.$$cRWTH Aachen$$d2014
000171851 500__ $$3POF3_Assignment on 2016-02-29
000171851 520__ $$aIn the present work the LCF (Low Cycle Fatigue) crack initiation life of the conventionally cast Ni-base alloy RENE 80 was analyzed as a function of specimen size and grain orientation. Five specimen geometries with distinctly different gauge sections were used: 3 geometries with cylindrical gauge section (G1-G3) and two notched geometries with a stress concentration factor of $\alpha$1 = 1,62 (KG1) and $\alpha$2 = 2,60 (KG2), resulting in a maximum difference of the damage relevant surface area up to a factor of approximately 72. Correction factors were determined by FEM calculations for all specimen geometries with highly reduced gauge sections where direct strain measurement was not possible. Additionally a uniform failure criterion with a relatively small crack size of 0,962 mm$^{2}$ was defined. Totally, 116 isothermal LCF tests were carried out at the different specimen types at a temperature of 850°C in total strain control with a load ratio (minimum strain / maximum strain) of R$_{ε}$ = -1. The load cycles were applied with triangular waveform at a frequency of 0.1 Hz for high strain amplitudes and 1 Hz for low strain amplitudes, respectively. After the LCF-Tests the fracture surfaces of all samples were analyzed in more detail by SEM to identify the crack initiation mechanisms as well as the crack initiation sites. In this context it could be shown, that fatigue cracks were generally initiated at slip bands in surface grains. Accordingly, the grain orientations at the crack initiation sites were measured by electron back scatter diffraction (EBSD) and the maximum shear stresses in the respective principal slip system (111) <110> was calculated using the Schmid approach. For this, longitudinal sections were be prepared exactly at the crack initiation sites of samples loaded with low strain amplitudes where clearly defined single crack initiation sites were observed. Afterwards the maximum shear stress in the principal slip system at the crack initiation site was correlated to the lifetime behavior, resulting in a distinct decrease of scatter and size influence compared to the conventional representation total strain vs. cycles to failure.
000171851 650_7 $$0V:(DE-588b)4012494-0$$2GND$$aDissertation$$xDiss.
000171851 773__ $$y2014
000171851 8564_ $$uhttps://juser.fz-juelich.de/record/171851/files/FZJ-2014-05408.pdf$$yOpenAccess
000171851 8564_ $$uhttps://juser.fz-juelich.de/record/171851/files/FZJ-2014-05408.jpg?subformat=icon-144$$xicon-144$$yOpenAccess
000171851 8564_ $$uhttps://juser.fz-juelich.de/record/171851/files/FZJ-2014-05408.jpg?subformat=icon-180$$xicon-180$$yOpenAccess
000171851 8564_ $$uhttps://juser.fz-juelich.de/record/171851/files/FZJ-2014-05408.jpg?subformat=icon-640$$xicon-640$$yOpenAccess
000171851 909CO $$ooai:juser.fz-juelich.de:171851$$pdnbdelivery$$pVDB$$pdriver$$popen_access$$popenaire
000171851 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
000171851 9141_ $$y2014
000171851 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)144244$$aForschungszentrum Jülich GmbH$$b0$$kFZJ
000171851 9132_ $$0G:(DE-HGF)POF3-119H$$1G:(DE-HGF)POF3-110$$2G:(DE-HGF)POF3-100$$aDE-HGF$$bForschungsbereich Energie$$lEnergieeffizienz, Materialien und Ressourcen$$vAddenda$$x0
000171851 9201_ $$0I:(DE-Juel1)IEK-2-20101013$$kIEK-2$$lWerkstoffstruktur und -eigenschaften$$x0
000171851 9801_ $$aFullTexts
000171851 980__ $$aphd
000171851 980__ $$aVDB
000171851 980__ $$aFullTexts
000171851 980__ $$aI:(DE-Juel1)IEK-2-20101013
000171851 980__ $$aUNRESTRICTED
000171851 981__ $$aI:(DE-Juel1)IMD-1-20101013