Accession Number : AD0825297

Title :   INVESTIGATION OF HOT CORROSION OF NICKEL BASE SUPERALLOYS USED IN GAS TURBINE ENGINES.

Descriptive Note : Final rept. 1 Jul 66-31 Aug 67,

Corporate Author : GENERAL MOTORS CORP INDIANAPOLIS IN ALLISON GAS TURBINE DIV

Personal Author(s) : Ryan, Kenneth H. ; Hamilton, Paul E. ; Kildsig, John R.

Report Date : AUG 1967

Pagination or Media Count : 100

Abstract : A program was conducted to investigate the hot corrosion resistance of nickel base alloys and is described. The most significant result obtained from the program was the derivation of a regression equation relating base metal volume loss to alloy chemistry and showing that chromium and aluminum were beneficial to hot corrosion resistance, whereas tungsten and molybdenum were detrimental. It was also established by electron microprobe study that hot corrosion resistance was related to alloy depletion zone composition. A high molybdenum content in the zone was detrimental and a high aluminum content beneficial to hot corrosion resistance. Hot corrosion severity increased with temperature in the range of 1700 to 2000F in an approximate logarithmic fashion. The order of decreasing hot corrosion resistance of the ten alloys investigated was: PDRL 163, IN-728 NX, Alloy 713C + 2% Cr + Y, Alloy 713C + 2% Cr, Inco 717, Alloy 713C, Mar-M421, IN-100, GMR-235, and Mar-M246. Heat treatment had a detrimental effect on the hot corrosion behavior of Mar-M246 and GMR-235 and no observed effect on the other eight alloys. It is recommended that test rig programs to simulate hot corrosion behavior in advanced turbine engines be conducted on turbine alloys under varying conditions of high temperature and pressure. (Author)

Descriptors :   (*GAS TURBINES, CORROSION), (*NICKEL ALLOYS, CORROSION RESISTANCE), CHROMIUM ALLOYS, ALUMINUM ALLOYS, TUNGSTEN ALLOYS, MOLYBDENUM ALLOYS, COBALT ALLOYS, TITANIUM ALLOYS, NIOBIUM ALLOYS, IRON ALLOYS, TANTALUM ALLOYS, VANADIUM ALLOYS, MANGANESE ALLOYS, HIGH TEMPERATURE.

Subject Categories : Properties of Metals and Alloys
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE