Effect of sulfur on creep strength of Ni-base single-crystal superalloy, TMS-1700

Yuichiro Joh, Satoshi Utada, Makoto Osawa, Toshiharu Kobayashi, Tadaharu Yokokawa, Kyoko Kawagishi, Shinsuke Suzuki, Hiroshi Harada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We studied the effect of sulfur addition on a Ni-base single-crystal superalloy, TMS-1700, by performing creep tests at 1100°C/137 MPa using specimens doped with 0, 10, 20, and 100 ppm sulfur. The creep rupture life was found to decrease with increasing sulfur concentration. The scanning electron microscopy (SEM) observation of creep-ruptured specimens revealed the coarsening of the raft structure with increasing sulfur concentration. Their transmission electron microscopy (TEM) observation showed the formation of coarser γ/γ′ interfacial dislocation networks with increasing sulfur concentration. These microstructural differences may be the cause of the shorter creep rupture life observed in alloys with higher sulfur addition.

Original languageEnglish
Pages (from-to)1305-1308
Number of pages4
JournalMaterials Transactions
Volume57
Issue number8
DOIs
Publication statusPublished - 2016

Keywords

  • Creep strength
  • Dislocation network
  • Nickel-base single-crystal superalloy
  • Sulfur

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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