TY - GEN
T1 - Strain controlled low cycle fatigue behavior of U720Li disk superalloy above 700 °C
AU - Sun, Fei
AU - Gu, Yuefeng
AU - Kawagishi, Kyoko
AU - Murakami, Hideyuki
AU - Yamabe-Mitarai, Yoko
N1 - Funding Information:
This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Structural Materials for Innovation” (Funding agency: JST).
Funding Information:
Acknowledgements This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Structural Materials for Innovation” (Funding agency: JST).
Publisher Copyright:
© The Minerals, Metals & Materials Society 2018.
PY - 2018
Y1 - 2018
N2 - The low cycle fatigue behaviors of Udimet 720Li (U720Li) and the related microstructure evolution have been investigated at 725 °C under strain control tests. The interrelationships between microstructure factors and properties were analyzed using transmission electron backscatter diffraction (t-EBSD) in scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For comparison, LCF behaviors at 650 °C were also presented to find the inferior aspects of U720Li alloy at relatively higher service temperatures. The results show that recrystallization occurs during the LCF testing at 725 °C. The extent of recrystallization increases with the strain. The LCF property at 725 °C is weakened to a large extent after recrystallization, which could be the significant factor that causes LCF degradation. Combination t-EBSD and TEM are beneficial for characterizing and analyzing the microstructure evolution in terms of primary y' precipitates and dislocations, proposing that gliding dislocations could concentrate into walls to form sub-grain boundaries, with the combination of primary y' precipitates to form sub-grains.
AB - The low cycle fatigue behaviors of Udimet 720Li (U720Li) and the related microstructure evolution have been investigated at 725 °C under strain control tests. The interrelationships between microstructure factors and properties were analyzed using transmission electron backscatter diffraction (t-EBSD) in scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For comparison, LCF behaviors at 650 °C were also presented to find the inferior aspects of U720Li alloy at relatively higher service temperatures. The results show that recrystallization occurs during the LCF testing at 725 °C. The extent of recrystallization increases with the strain. The LCF property at 725 °C is weakened to a large extent after recrystallization, which could be the significant factor that causes LCF degradation. Combination t-EBSD and TEM are beneficial for characterizing and analyzing the microstructure evolution in terms of primary y' precipitates and dislocations, proposing that gliding dislocations could concentrate into walls to form sub-grain boundaries, with the combination of primary y' precipitates to form sub-grains.
KW - Disk superalloy
KW - Low cycle fatigue
KW - Microstructure transmission-EBSD
KW - TEM
KW - U720Li
UR - http://www.scopus.com/inward/record.url?scp=85064884163&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85064884163&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-89480-5_52
DO - 10.1007/978-3-319-89480-5_52
M3 - Conference contribution
AN - SCOPUS:85064884163
T3 - Minerals, Metals and Materials Series
SP - 779
EP - 788
BT - Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives
A2 - Heck, Karl
A2 - Bi, Zhongnan
A2 - Andersson, Joel
A2 - Liu, Xingbo
A2 - Bockenstedt, Kevin
A2 - Sudbrack, Chantal
A2 - Groh, Jon
A2 - Ott, Eric
A2 - Dempster, Ian
A2 - Jablonski, Paul
A2 - Nagahama, Daisuke
A2 - Kaplan, Max
PB - Springer International Publishing
T2 - 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications
Y2 - 3 June 2018 through 6 June 2018
ER -