EFFECT OF RARE EARTH MISCHMETAL ADDITIONS ON THE MICROSTRUCTURAL AND MECHANICAL PERFORMANCE OF INCONEL 718 SUPERALLOY FABRICATED BY POWDER METALLURGY

Abstract

The Superalloy Inconel 718 (IN-718) has excellent mechanical performance and high oxidation resistance; the main uses are in parts aerospace engines and the petrochemical industry at relatively elevated temperatures. Recent research has focused on determining the effects of adding rare earth elements (REE) mixtures in superalloys to improve the microstructural and mechanical characteristics. For this reason, this investigation is focused on understanding the correlation between the REE mischmetal additions, hot isostatic pressure (HIP) sintering, and heat treatments in the microstructural and mechanical properties in In-718.