Studies of the Low Temperature Hot Corrosion of Uncoated Superalloys.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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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 alloys 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. Author
- Properties of Metals and Alloys