Investigation of Hot Corrosion of Nickel Base Superalloys Used in Gas Turbine Engines
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0825297
Entities
People
- John R. Kildsig
- Kenneth H. Ryan
- Paul E. Hamilton
Organizations
- General Motors