Strain controlled low cycle fatigue behavior of U720Li disk superalloy above 700 °C

Fei Sun, Yuefeng Gu, Kyoko Kawagishi, Hideyuki Murakami, Yoko Yamabe-Mitarai

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルProceedings of the 9th International Symposium on Superalloy 718 and Derivatives
ホスト出版物のサブタイトルEnergy, Aerospace, and Industrial Applications
編集者Karl Heck, Zhongnan Bi, Joel Andersson, Xingbo Liu, Kevin Bockenstedt, Chantal Sudbrack, Jon Groh, Eric Ott, Ian Dempster, Paul Jablonski, Daisuke Nagahama, Max Kaplan
出版社Springer International Publishing
ページ779-788
ページ数10
ISBN(電子版)9783319894799
DOI
出版ステータスPublished - 2018
外部発表はい
イベント9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications - Pittsburgh, United States
継続期間: 2018 6 32018 6 6

出版物シリーズ

名前Minerals, Metals and Materials Series
2018-June
ISSN(印刷版)2367-1181
ISSN(電子版)2367-1696

Conference

Conference9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications
CountryUnited States
CityPittsburgh
Period18/6/318/6/6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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