Studies of the low temperature hot corrosion of uncoated superalloys
Technical Report
·
OSTI ID:5046567
Several nickel-based superalloys used in the manufacture of gas turbine hot section components were investigated to determine potential alloying element effects on the uncoated alloy's resistance to low temperature hot corrosion (LTHC). In addition, the nickel-based alloy IN 738 was modified with one and two percent concentrations of hafnium to evaluate the effect of this active element on LTHC resistance. The alloys were ranked into groups of good, moderate or poor, regarding their resistance to LTHC. Relatively high chromium contents were found to be beneficial while relatively high contents of cobalt were unexpectedly determined to be detrimental. The LTHC resistance of IN 738 was improved by small additions of hafnium. This program also showed that the Naval Postgraduate School hot corrosion furnace reproduced the corrosion patterns seen on uncoated alloys in burner rigs and industrial gas turbines.
- Research Organization:
- Naval Postgraduate School, Monterey, CA (USA)
- OSTI ID:
- 5046567
- Report Number(s):
- AD-A-110992/5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
CORROSION
CRYSTAL STRUCTURE
FEASIBILITY STUDIES
GAS TURBINES
HAFNIUM ALLOYS
HEAT TREATMENTS
INCONEL 738
INCONEL ALLOYS
LOW TEMPERATURE
MACHINERY
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PATTERN RECOGNITION
PHOTOGRAPHY
PHOTOMICROGRAPHY
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS
TURBINES
TURBOMACHINERY
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
CORROSION
CRYSTAL STRUCTURE
FEASIBILITY STUDIES
GAS TURBINES
HAFNIUM ALLOYS
HEAT TREATMENTS
INCONEL 738
INCONEL ALLOYS
LOW TEMPERATURE
MACHINERY
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PATTERN RECOGNITION
PHOTOGRAPHY
PHOTOMICROGRAPHY
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS
TURBINES
TURBOMACHINERY