Scale-Up Thermomechanical Processing of MA 6000E

Abstract

Inco has developed a very strong and corrosion re- sistant oxide dispersion strengthened superalloy, MA 6000E, by the mechanical alloying process. The alloy (15Cr–2Mo–4W–4·5Al–2·5Ti–2Ta–0·15Zr– 0·01B–1·1Y₂O₃–bal. Ni) exhibits a typical 100h rupture strength of 138 MN m⁻² at 1093°C and 552 MN m⁻² at 760°C. The oxidation and sulphidation resistances of the alloy are equal to those of IN–100 and IN–792 respectively. This paper describes how the results of laboratory research were successfully scaled-up to commercial practice. The development of a production route from mechanically alloyed powder to fully processed and heat-treated blading bar is discussed. PM/0185