Abstract
Numerical simulation of vacuum investment directionally solidified (DS) high pressure turbine blade casting is carried out using a software. DS turbine blade is produced by pouring the molten CM247LC superalloy into an investment mullite mold. The simulated thermal profiles at three different locations of the DS casting have confirmed that the grain growth has proceeded from bottom to top, which is the direction inverse to the heat extraction and prime requirement of directional solidification.Longitudinal orientation resulted in higher cooling rate, while the transverse in least cooling rate. However, the 450 orientation had cooling rate intermediate to that of transverse and longitudinal. The temperature gradient is found to be highest for 450 orientation compared to the longitudinal and transverse orientations. Microstructure revealed columnar dendritic structure, γ / γ’ eutectic aggregate, smaller amount of MC type of carbides, and γ’ intermetallic.
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