Degradation of three ni-based superalloys used for gas turbine hot-gas path components after long term agings

Daizo Saito, Yomei Yoshioka, Reki Takaku, Takashi Matsuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In case of enhancing operation temperature of land base gas turbines, it is very important to understand the materials degradation mechanisms of hotgas path components. In this study, long term agings at the high temperature were conducted for three kinds of Ni-based superalloys, Hastelloy X, Nimonic 263 and 1N738LC. Through the microstructure observations and the identifications of the precipitates in these three alloys aged at various conditions, new Time-Temperature -Precipitation diagrams were determined for the alloys. The quantitative analyses of intragranular precipitates, such as volume fraction, size and inter-particle spacing of precipitates, were conducted. The degradation behaviors of these alloys aged were evaluated by the creep tests at relatively higher stress conditions. The ratio of the minimum creep rate to that of the initial as-heat-treated one was used as an indication of degradation and the ratio is called a degradation ratio in this study.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition MS and T'08
Pages1086-1092
Number of pages7
Publication statusPublished - 2008 Dec 1
Externally publishedYes
EventMaterials Science and Technology Conference and Exhibition, MS and T'08 - Pittsburgh, PA, United States
Duration: 2008 Oct 52008 Oct 9

Publication series

NameMaterials Science and Technology Conference and Exhibition, MS and T'08
Volume2

Other

OtherMaterials Science and Technology Conference and Exhibition, MS and T'08
CountryUnited States
CityPittsburgh, PA
Period08/10/508/10/9

Keywords

  • Aging
  • Degradation
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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  • Cite this

    Saito, D., Yoshioka, Y., Takaku, R., & Matsuo, T. (2008). Degradation of three ni-based superalloys used for gas turbine hot-gas path components after long term agings. In Materials Science and Technology Conference and Exhibition MS and T'08 (pp. 1086-1092). (Materials Science and Technology Conference and Exhibition, MS and T'08; Vol. 2).