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Statements

Subject Item
n2:RIV%2F61389005%3A_____%2F14%3A00435772%21RIV15-GA0-61389005
rdf:type
skos:Concept n16:Vysledek
dcterms:description
Characterization of the early stage precipitation is an important issue as it controls the emerging microstructure developed on Ni-based superalloys which are used as single crystal blades in gas turbines. The difficulty is that the gamma prime precipitation occurs at high temperatures and the reaction kinetic is very fast. Therefore, experimental methods with high time resolution are needed to monitor gamma' precipitation. By using the high flux synchrotron instrument HARWI-II set up of the Helmholtz-Zentrum Geesthacht with a fast data collection detector, it was possible to observe the creation of fine precipitates and their early growth in a tungsten-rich Ni-base superalloy. The cooling down of the superalloy from the single-phase region to lower temperatures already leads to the formation of precipitates in the size range of a few nm. The formation and growth of the precipitates at this early stage is described in detail. In addition, SANS measurements were performed at the new SANS-1 instrument at MLZ in Garching to extend the results to larger precipitate sizes. DSC experiments were used to determine the critical temperatures of the formation of these fine precipitates, as well as the temperature at which they dissolve during heating. Characterization of the early stage precipitation is an important issue as it controls the emerging microstructure developed on Ni-based superalloys which are used as single crystal blades in gas turbines. The difficulty is that the gamma prime precipitation occurs at high temperatures and the reaction kinetic is very fast. Therefore, experimental methods with high time resolution are needed to monitor gamma' precipitation. By using the high flux synchrotron instrument HARWI-II set up of the Helmholtz-Zentrum Geesthacht with a fast data collection detector, it was possible to observe the creation of fine precipitates and their early growth in a tungsten-rich Ni-base superalloy. The cooling down of the superalloy from the single-phase region to lower temperatures already leads to the formation of precipitates in the size range of a few nm. The formation and growth of the precipitates at this early stage is described in detail. In addition, SANS measurements were performed at the new SANS-1 instrument at MLZ in Garching to extend the results to larger precipitate sizes. DSC experiments were used to determine the critical temperatures of the formation of these fine precipitates, as well as the temperature at which they dissolve during heating.
dcterms:title
Investigations of early stage precipitation in a tungsten-rich nickel-base superalloy using SAXS and SANS Investigations of early stage precipitation in a tungsten-rich nickel-base superalloy using SAXS and SANS
skos:prefLabel
Investigations of early stage precipitation in a tungsten-rich nickel-base superalloy using SAXS and SANS Investigations of early stage precipitation in a tungsten-rich nickel-base superalloy using SAXS and SANS
skos:notation
RIV/61389005:_____/14:00435772!RIV15-GA0-61389005
n5:aktivita
n15:P n15:I
n5:aktivity
I, P(GB14-36566G)
n5:cisloPeriodika
NOV
n5:dodaniDat
n12:2015
n5:domaciTvurceVysledku
n11:2458985
n5:druhVysledku
n13:J
n5:duvernostUdaju
n10:S
n5:entitaPredkladatele
n8:predkladatel
n5:idSjednocenehoVysledku
22784
n5:idVysledku
RIV/61389005:_____/14:00435772
n5:jazykVysledku
n17:eng
n5:klicovaSlova
high temperature alloys; precipitation; synchrotron radiation; neutron scattering; scanning electron microscopy
n5:klicoveSlovo
n7:scanning%20electron%20microscopy n7:synchrotron%20radiation n7:precipitation n7:high%20temperature%20alloys n7:neutron%20scattering
n5:kodStatuVydavatele
CH - Švýcarská konfederace
n5:kontrolniKodProRIV
[16D6DBC58192]
n5:nazevZdroje
Journal of Alloys and Compounds
n5:obor
n18:BM
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
7
n5:projekt
n6:GB14-36566G
n5:rokUplatneniVysledku
n12:2014
n5:svazekPeriodika
612
n5:tvurceVysledku
Karge, L. Gilles, R. Lippmann, T. Mukherji, D. Eckerlebe, H. Strunz, Pavel Staron, P.
n5:wos
000339692300016
s:issn
0925-8388
s:numberOfPages
8
n14:doi
10.1016/j.jallcom.2014.05.154