The effect of gas cooling on microstructure refinement during the production of single crystal blades by the Developed Gas Cooling Casting (DGCC) method was investigated. Primary dendrite arm spacing (PDAS) reached the highest values in the airfoil and lowest in the blade platform. However, with the Bridgman method, the tendency of PDAS change along the blade was the opposite. When using the DGCC method, the PDAS decreased by about 100 µ m in the platform compared to the conventional radiation cooling.
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Szeliga et al. (2024) studied this question.
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