Strengthening of Fe-Cr-Al-Y Oxidation Resistant Alloys.
Abstract:
An investigation of oxide dispersion strengthening of oxidation resistant FeCrAlY alloys was conducted using both coarse and fine metal powder approaches. The most successful method involved preoxidizing and extruding Fe-25Cr-4Al-1Y 2541 coarse atomized powders. A detailed thermomechanical processing TMP study of this material showed that 2000F tensile and stress rupture properties varied widely with rolling-heat treating schedules. Yield and tensile strengths at 2000F were from 1 to 4.5 times the values for conventional alloy 2541 and 2000F rupture stress at constant Larsen Miller parameter number were from 1 to more than 5.3 times the values for conventional alloy 2541 depending on TMP schedule used.