Creep life prediction of Ni-base superalloy used in advanced gas turbine blades by electrochemical method

Translated title of the contribution: Creep life prediction of Ni-base superalloy used in advanced gas turbine blades by electrochemical method

Shin Ichi Komazaki, Tetsuo Shoji, Minoru Sato

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In order to develop a creep life assessment technique for a directionally solidified Ni-base superalloy CM247LC used in advanced gas turbine blades, changes in electrochemical properties of CM247LC due o creep have been investigated. The electrochemical polarization technique has been applied to creep-ruptured and creep-interrupted specimens under various creep conditions in order to examine a detectability of creep damage. Experimental results on electrochemical polarization measurements revealed that the peak current density "Ip" and "Ipr" which appeared at a specific potential during potentiodynamic polarization reactivation measurements in dilute glyceregia solution linearly increased with a life fraction in early stage of the creep life (t/tr=0.3). The increases in Ip and IIr mainly corresponded to increases in preferential dissolution rate of γ′ phase at γ/γ′ interface. This preferential dissolution was considered as a result from change in chemical composition of y phase at ylY interface which may be attributable to creep damage accumulation. As a consequence, the creep life fraction can be estimated with high accuracy by the electrochemical technique.

Translated title of the contributionCreep life prediction of Ni-base superalloy used in advanced gas turbine blades by electrochemical method
Original languageJapanese
Pages (from-to)1147-1155
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume65
Issue number633
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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