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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F12%3A00387606%21RIV13-GA0-68081723
rdf:type
n17:Vysledek skos:Concept
dcterms:description
Cyclic strain controlled multiple step tests have been performed on cylindrical specimens of cast Inconel 738LC superalloy at 23 and 800 °C and Inconel 792-5A superalloy at 800 °C in laboratory atmosphere. The effect of temperature on the cyclic stress-strain response characterized by internal and effective cyclic stress components and on the dislocation arrangement has been studied. The evolution of the effective and internal stress components and effective elastic moduli were derived from the hysteresis loops analyzed according to the statistical theory of the hysteresis loop. Cyclic hardening/softening curves and shortened cyclic stress-strain curves were obtained at all temperatures in both superalloys. The shortened cyclic stress-strain curves (CSSCs) can be fitted by power law at all temperatures and for both materials. They are shifted to lower stresses with increasing temperature. The CSSC of Inconel 792-5A is shifted to higher stress amplitude in comparison with that of Inconel 738LC due to different number and type of precipitates. Observation of dislocation structures by TEM revealed cyclic strain localization into persistent slip bands. Cyclic stress-strain response is compared at all temperatures in both superalloys and discussed in relation to the changes of internal and effective stress components and microstructural parameters of the material. Higher stress response of the Inconel 792-5A than of the Inconel 738LC superalloy at 800°C is due to higher effective stresses of respective γ´ phases. Cyclic strain controlled multiple step tests have been performed on cylindrical specimens of cast Inconel 738LC superalloy at 23 and 800 °C and Inconel 792-5A superalloy at 800 °C in laboratory atmosphere. The effect of temperature on the cyclic stress-strain response characterized by internal and effective cyclic stress components and on the dislocation arrangement has been studied. The evolution of the effective and internal stress components and effective elastic moduli were derived from the hysteresis loops analyzed according to the statistical theory of the hysteresis loop. Cyclic hardening/softening curves and shortened cyclic stress-strain curves were obtained at all temperatures in both superalloys. The shortened cyclic stress-strain curves (CSSCs) can be fitted by power law at all temperatures and for both materials. They are shifted to lower stresses with increasing temperature. The CSSC of Inconel 792-5A is shifted to higher stress amplitude in comparison with that of Inconel 738LC due to different number and type of precipitates. Observation of dislocation structures by TEM revealed cyclic strain localization into persistent slip bands. Cyclic stress-strain response is compared at all temperatures in both superalloys and discussed in relation to the changes of internal and effective stress components and microstructural parameters of the material. Higher stress response of the Inconel 792-5A than of the Inconel 738LC superalloy at 800°C is due to higher effective stresses of respective γ´ phases.
dcterms:title
Analysis of cyclic plasticity of fatigued nickel based superalloys at elevated temperatures Analysis of cyclic plasticity of fatigued nickel based superalloys at elevated temperatures
skos:prefLabel
Analysis of cyclic plasticity of fatigued nickel based superalloys at elevated temperatures Analysis of cyclic plasticity of fatigued nickel based superalloys at elevated temperatures
skos:notation
RIV/68081723:_____/12:00387606!RIV13-GA0-68081723
n17:predkladatel
n18:ico%3A68081723
n3:aktivita
n15:I n15:P
n3:aktivity
I, P(GAP204/11/1453)
n3:dodaniDat
n7:2013
n3:domaciTvurceVysledku
n5:1204726 n5:6050956 n5:1204246 n5:7066325 n5:8246513 n5:9884149
n3:druhVysledku
n13:D
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
122102
n3:idVysledku
RIV/68081723:_____/12:00387606
n3:jazykVysledku
n14:eng
n3:klicovaSlova
superalloy; precipitates; internal stress; effective stress
n3:klicoveSlovo
n11:effective%20stress n11:internal%20stress n11:superalloy n11:precipitates
n3:kontrolniKodProRIV
[0F6452A5028D]
n3:mistoKonaniAkce
Brno
n3:mistoVydani
Brno
n3:nazevZdroje
Proceedings of the 16th International Colloquium Mechanical Fatigue of Materials
n3:obor
n4:JL
n3:pocetDomacichTvurcuVysledku
6
n3:pocetTvurcuVysledku
6
n3:projekt
n6:GAP204%2F11%2F1453
n3:rokUplatneniVysledku
n7:2012
n3:tvurceVysledku
Tobiáš, Jiří Polák, Jaroslav Chlupová, Alice Petrenec, Martin Petráš, Roman Šmíd, Miroslav
n3:typAkce
n12:WRD
n3:zahajeniAkce
2012-09-24+02:00
s:numberOfPages
6
n9:hasPublisher
Ústav fyziky materiálů AV ČR
n19:isbn
978-80-87434-05-5