Rafting of single crystal superalloy by high thermal stress

Masahiro Matsushita, Yoshitaka Fukuyama, Yoshiaki Fujisawa, Jinxiang Chen, Yomei Yoshioka, Takehisa Hino

Research output: Contribution to journalArticlepeer-review

Abstract

Rafting of the nickel-base single crystal superalloy CMSX-2 was investigated under the condition of high thermal stress using a newly constructed experimental equipment. The test piece with the diameter of 25 mm was tested at the maximum material temperature of 1000 degree Celsius for 80 hours. The results showed that the raft structure occurred only under the influence of thermal stress. The raft structure developed parallel to the direction of the compressive thermal stress because of negative lattice misfit. The thickness of gamma phase and gamma prime phase in rafting increase with the increase in the temperature and the thermal stress.

Original languageEnglish
Pages (from-to)475-481
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume73
Issue number4
DOIs
Publication statusPublished - 2007 Apr
Externally publishedYes

Keywords

  • Gas turbine
  • Material testing
  • Single crystal
  • Superalloy
  • Thermal stress

ASJC Scopus subject areas

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

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