Influence of Y-Rich Compounds on High-Cycle Fatigue Performance of Y-Doped M951 Superalloy

Pengjie Zhou, Dehang Song, Ning Liu, Nobufumi Ueshima, Katsunari Oikawa

Research output: Contribution to journalArticle

Abstract

The performance of Y-doped M951 superalloy under high-cycle fatigue was investigated experimentally to determine the effect of Y-rich compounds on this behavior. The selected testing temperatures were 700 and 900 °C, and the stress ratio was R = 0.1. The fatigue life was shown to decrease as the stress amplitude increased, according to a typical Whöler S-N diagram. Two types of crack initiation sites were observed on the fractured surfaces: microshrinkage clusters and Y-rich compounds. Analysis by TEM indicated that the Y-rich compounds consisted of Al2Ni6Y3 particles with BCC structure and Ni5Y particles with hexagonal structure. Cracks had initiated and propagated along the interface between Al2Ni6Y3 phase and the matrix. These Y-rich compounds varied considerably in size, from 1 to 769 μm, and the large-size Y-rich compounds were shown to be the preferred site for fatigue crack origin. The ability of Y in the removal of sulfur was considered. And the small-size Y-S product from the reaction between Y and S was shown to exhibit no deleterious effect on the fatigue property of the M951 Ni-based superalloy.

Original languageEnglish
Pages (from-to)6053-6062
Number of pages10
JournalJournal of Materials Engineering and Performance
Volume28
Issue number10
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • casting and solidification
  • failure analysis
  • high-cycle fatigue
  • superalloys
  • yttrium

ASJC Scopus subject areas

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

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