Paper Title:
Temperature Dependence of High-Cycle Fatigue Behavior of a Ni-Base Single Crystal Superalloy
  Abstract

Smooth specimens of single crystal (SC) superalloy SRR99 with [001] orientation were subjected to high-cycle fatigue (HCF) loading at temperatures of 700°C, 760°C, 850°C and 900°C in air atmosphere. The results demonstrated that conditional fatigue strength reached the maximum at 760°C and decreases with increasing temperature. Analysis on fracture surface showed a trend for cleavage rupture at 850°C and 900°C and ductile rupture at 700°C and 760°C. Fatigue cracks initiated at the surface or subsurface were primarily responsible for the ultimate failure. The influence of testing temperature on fatigue lifetime was studied by examining evolution of the microstructure through SEM observation. With the process of cyclic loading at elevated temperatures, the primary cuboidal γ′ precipitates tended to agglomerate and spheroidized, meanwhile a larger number of secondary γ′ particles were formed in the γ matrix in specimens fatigue tested at 700°C, which would have a significant effect on the high temperature properties.

  Info
Periodical
Materials Science Forum (Volumes 546-549)
Edited by
Yafang Han et al.
Pages
1219-1224
DOI
10.4028/www.scientific.net/MSF.546-549.1219
Citation
Y. Liu, J. J. Yu, Y. Xu, X. F. Sun, H. R. Guan, Z. Q. Hu, "Temperature Dependence of High-Cycle Fatigue Behavior of a Ni-Base Single Crystal Superalloy", Materials Science Forum, Vols. 546-549, pp. 1219-1224, 2007
Online since
May 2007
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