Metallurgical Transactions A

, Volume 13, Issue 11, pp 1951–1955 | Cite as

Induced creep and creep/fatigue of a nickel-base superalloy at ambient temperatures

  • G. L. Chen
  • L. G. Fritzemeier
  • X. Xie
  • J. K. Tien
Mechanical Behavior
Received:

Abstract

The stress controlled fatigue of Nimonic*115, a typical γ’-strengthened nickel-base superalloy, was studied at ambient temperature, using a trapezoidal wave form at 1 Hz, with stresses chosen to produce failure in the lO4 to lO4 cycle range. In tests with maximum stress greater than the proportional limit, most of the fatigue damage occurs within the first few test cycles. Much of this strain is accumulated under static load and is therefore identified as creep strain. Transmission electron microscopy shows that these creep strains occur in slip bands which disrupt the ordered γ’ precipitates. Strain is found to follow a logarithmic time dependence, which suggests a low activation energy mechanism.

Keywords

Metallurgical Transaction Creep Strain Slip Band Stress Range Steady State Creep 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© American Society for metals and the metallurgical society of AIME 1982

Authors and Affiliations

  • G. L. Chen
    • 1
  • L. G. Fritzemeier
    • 1
  • X. Xie
    • 1
  • J. K. Tien
    • 1
  1. 1.Henry Krumb School of MinesColumbia University

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