TY - JOUR
T1 - Transverse Creep of Nickel-Base Superalloy Bicrystals
AU - Stinville, J. C.
AU - Gallup, K.
AU - Pollock, T. M.
N1 - Funding Information:
The authors gratefully acknowledge the support of GE Power and Water (S. Balsone, J. Schaeffer, A. Peck) and NSF Grant DMR 1233704. The authors also acknowledge the assistance of J. Cormier and P. Villechaise.
Publisher Copyright:
© 2015, The Minerals, Metals & Materials Society and ASM International.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - A liquid metal cooled (LMC) solidification technique was used to produce nickel-base GTD 444 and René N4 superalloy bicrystals with varying degrees of misorientation. Creep experiments with loading normal to the bicrystal boundaries were conducted at 1255 K (982 °C). Despite the similar overall compositions of these two alloys, the GTD 444 alloy with higher levels of carbon and boron displayed significantly higher tolerance to high-angle boundaries. Creep ductilities at rupture of greater than 5 pct were observed in GTD444 for boundaries misoriented by greater than 20 deg. Electron backscatter diffraction analysis showed significant lattice rotation adjacent to the bicrystal boundary in GTD444. In contrast, the René N4 bicrystal accumulated damage along the grain boundary early in creep, failing at less than 2 pct strain.
AB - A liquid metal cooled (LMC) solidification technique was used to produce nickel-base GTD 444 and René N4 superalloy bicrystals with varying degrees of misorientation. Creep experiments with loading normal to the bicrystal boundaries were conducted at 1255 K (982 °C). Despite the similar overall compositions of these two alloys, the GTD 444 alloy with higher levels of carbon and boron displayed significantly higher tolerance to high-angle boundaries. Creep ductilities at rupture of greater than 5 pct were observed in GTD444 for boundaries misoriented by greater than 20 deg. Electron backscatter diffraction analysis showed significant lattice rotation adjacent to the bicrystal boundary in GTD444. In contrast, the René N4 bicrystal accumulated damage along the grain boundary early in creep, failing at less than 2 pct strain.
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U2 - 10.1007/s11661-015-2869-5
DO - 10.1007/s11661-015-2869-5
M3 - Article
AN - SCOPUS:84937764819
SN - 1073-5623
VL - 46
SP - 2516
EP - 2529
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 6
ER -