Strengthening of Fe-Cr-Al-Y Oxidation Resistant Alloy
Final rept. 6 Apr 1972-6 Apr 1973
GENERAL ELECTRIC CO CINCINNATI OH MATERIAL AND PROCESS TECHNOLOGY LABS
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An investigation of oxide dispersion strengthening ODS of oxidation resistant FeCrAlY alloys was conducted using argon atomized prealloyed powders and a modified SAP technique. The main objectives were to improve surface stability establish uniform powder pre-oxidation techniques and improve the stress-rupture properties to the level exhibited by TD NiCr sheet. Increased chromium content proved very successful in eliminating breakaway oxidation. Several powder pre-oxidation techniques were identified which provide uniform oxidation and prevention of nitrogen contamination. Target weight gains were consistently achieved. Rupture stress of the ODS FeCrAlY bar was raised to the 9.0 ksi level through the addition of 6 vo oxide and is now comparable in strength to TD NiCr at temperatures above 2000F. If a density correction is applied to the rupture stress, ODS FeCrAlY is superior to TD NiCr at temperatures above approximately 1800F.
- Properties of Metals and Alloys
- Fabrication Metallurgy