THE DEVELOPMENT OF CMSX®-10,
A THIRD GENERATION SX CASTING SUPERALLOY

Gary L. Erickson

Cannon-Muskegon Corporation
[SPS Technologies]

Muskegon, Michigan  U.S.A.

ABSTRACT

The CMSX®-10 alloy is a third generation single crystal (SX) casting material which is characterized by its 6. wt. % Re content, relatively high refractory element level (W + Ta + Re + Mo) and its low level of chromium employment. The alloy's high temperature creep-rupture resistance is greater than that of all other Ni-based alloys (based on published data) existing throughout the world (approximately 30°C better than CMSX-4 and PWA 1484). Moreover, the alloy's composition is balanced to provide an attractive blend of SX component castability, heat treatability, impact strength, fatigue strength and resistance to environmental degradation. Most notably, the alloy provides extremely good bare hot corrosion resistance, despite its novel and relatively low (2-3 wt. %) chromium content.