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On the effect of long service exposure: changes in microstructure and mechanical properties of Ni-based superalloy

Authors
  • Keyvanlou, Hassan
  • Soleimani Gilakjani, Reza
  • Nezakat, Majid
Type
Published Article
Journal
Metallurgical Research & Technology
Publisher
EDP Sciences
Publication Date
Nov 17, 2020
Volume
117
Issue
6
Identifiers
DOI: 10.1051/metal/2020080
Source
EDP Sciences
Keywords
Disciplines
  • Regular Article
License
White
External links

Abstract

In the present study, the microstructure and the mechanical properties of GTD-111 nickel-based superalloy were investigated. The alloy was in service as the GE-MS9001 gas turbine 1st stage rotating blade for 105,000 hours at a temperature between 950 to 1000 °C. Two sets of samples were extracted from the airfoil and the root of the blade. Then, they were compared for the microstructural and the mechanical properties changes after the high temperature service. Stress-rupture and Charpy V-notch (CVN) tests were conducted on the samples at 871 °C and two temperatures of 25 and 900 °C, respectively. The microstructure and the fracture surface of the samples were analyzed using a scanning electron microscope (SEM). The results showed degradation in the microstructure and the mechanical properties of the airfoil compared to those of the root due to the long-term service at elevated temperatures. The loss in mechanical properties was due to the coarsening of γ’ precipitates and the formation of brittle phases in the grain boundaries.

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