Effect of Pre-straining on the Tensile and Stress-Rupture Properties of a Novel Ni-Co Based Superalloy

Bin Gan, Zhongnan Bi, Cheng Yang, Hongyao Yu, Rui Hu, Jinhui Du

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For Ni-Co-based superalloys, the higher level of Co content, the lower the stacking fault energy, which promotes the formation of deformation twins and affects the mechanical properties of the materials. Mechanical tests of a novel Ni-Co-based superalloy at temperatures between 25 and 760 ℃ revealed that its strength maintained a sufficiently high level when the testing temperature was up to 650 ℃, above which the tensile strength decreased with test temperature, and there was a sharp drop at 760 ℃. Pre-strain tests at room temperature indicated that the density of dislocation and stacking faults increased with strains and they became obstacles for dislocation motion at elevated temperatures, resulting in an increase in yield strength. In addition, the grain boundary of the pre-strained specimens has a higher dislocation density than the grain interior, and dislocation recovery occurred during the stress-rupture process, resulting in a lower stress-rupture life than the sample without a pre-strain.

Original languageEnglish
Title of host publicationProceedings of the 10th International Symposium on Superalloy 718 and Derivatives, 2023
EditorsEric A. Ott, Joel Andersson, Chantal Sudbrack, Zhongnan Bi, Kevin Bockenstedt, Ian Dempster, Michael Fahrmann, Paul Jablonski, Michael Kirka, Xingbo Liu, Daisuke Nagahama, Tim Smith, Martin Stockinger, Andrew Wessman
PublisherSpringer Science and Business Media Deutschland GmbH
Pages179-195
Number of pages17
ISBN (Print)9783031274466
DOIs
StatePublished - 2023
Event10th International Symposium on Superalloy 718 and Derivatives, 2023 - San Diego, United States
Duration: 19 Mar 202323 Mar 2023

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference10th International Symposium on Superalloy 718 and Derivatives, 2023
Country/TerritoryUnited States
CitySan Diego
Period19/03/2323/03/23

Keywords

  • Nanotwins
  • Ni-Co based superalloys
  • Pre-straining
  • Stress-rupture
  • Tensile tests

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