Damage tolerance of wrought alloy 718 Ni-Fe-base superalloy
- Carleton Univ., Ottawa, Ontario (Canada). Dept. of Mechanical and Aerospace Engineering
- National Research Council of Canada, Ottawa, Ontario (Canada). Structures and Materials Lab.
The influence of a modified heat treatment (MHT) and the standard heat treatment (SHT) on the damage tolerance of alloy 718 turbine disk material has been studied over a range of temperature -- from room temperature to 650 C. The influence of these heats treatments on creep, low-cycle fatigue (LCF), notch sensitivity, cyclic stability, and fatigue crack growth rate (FCGR) properties has been studied. The microstructure developed through the MHT sequence is shown to be damage tolerant over the temperature range studied. Shot peening leads to a marked improvement in the LCF crack initiation life of the MHT material relative to the SHT material at 650 C. Serrated grain boundaries formed through controlled precipitation of grain-boundary [delta] phase are beneficial to elevated-temperature FCGRs. The [delta]-phase precipitates formed at an angle to the grain boundaries do not make the material notch sensitive.
- OSTI ID:
- 6935960
- Journal Information:
- Journal of Materials Engineering and Performance; (United States), Vol. 3:3; ISSN 1059-9495
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INCONEL 718
HEAT TREATMENTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
CRACK PROPAGATION
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL ALLOYS
IRON ALLOYS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies