Directional Solidification Behavior of CMSX-6 Superalloy

Abstract

The directional solidification behavior of a first generation single crystal superalloy CMSX-6 was investigated. The solidification rate range in 25μm/s to 100μm/s and a thermal gradient G of 30K/cm were used for the present study. The experimental results show that the primary dendrite arm space (PDAS) decreased from (432±8) μm to (369±4) μm as the solidification rate increased, and the sizes of the eutectic pools also decreased as the solidification rate increased. And the volume fractions of eutectic γ/γ' were about 7% to 9% with different solidification rate. The γ/γ'- eutectic was comprised with coarse γ' phase and fine γ/γ' network. The morphology of the γ/γ’ eutectic supported the possibility that the solidification of γ/γ’ eutectic initiates with the formation of fine γ/γ’.

Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

“…[10]. The experimental results discussed in [11] show that the sizes of the eutectic pools decreased as the solidification rate increased. That is why presented in the study quantitative estimation of (γ + γ') eutectic areas can be helpful during the investigations on the effect of technology process on a superalloy microstructure.…”

Microstructure and mechanical properties of a first-generation single crystal superalloy CMSX-6

“…The nickel-based single crystal (SC)superalloys has excellent high temperature mechanical properties and anti-oxidation and corrosion resistance properties, which is widely used as the materials of turbine blades for aviation engines and gas turbines [1][2][3][4][5][6]. Since the development of the first single crystal high temperature alloy PWA1480 in USA in the early 1980s, different kinds of nickel-based single crystal superalloys, including first, second, third generation nickel-based single crystal superalloys have been developed in many countries, in the world during the last 4 decades.…”