Question: In turbine blade casting, how is a single-crystal structure achieved? Select one or more: a. By introducing impurities into the molten alloy in the mould

In turbine blade casting, how is a single-crystal structure achieved? Select one or more: a. By introducing impurities into the molten alloy in the mould b. By using a curving coil-like channel in the casting mould c. By careful control of the temperatures of the mould d. By removing grain boundaries by hot working and recrystallisation

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