Development of Exothermically Cast Single-Crystal Mar-M 247 and Derivative Alloys

Abstract

Muskegon 11 low-cost, exothermic directional-solidification (DS) process was successfully developed to produce single-crystal (SC) Mar-M 247 high-pressure turbine blades. Stress-rupture data indicated that SC Mar-M 247 provides only marginal improvements in longitudinal strength relative to the columnar grained DS material.