The manuscript presents changes of macrostructure and microstructure of plate and shaft castings made of cobalt alloy MAR-M509. They have different values of geometric module M within the range of 0.91-5.56 mm that have been created with multilayer ceramic shell moulds (MSC) of different initial temperatures of 200-1000 ℃at the moment of pouring. It has been stated that decrease of initial temperature of MSC and value M causes increase in casting fine-granularity,distance reduction between dendrite branches (λ)2 and refinement of initial carbides in irregular ternary eutectic γ+M23C6+MC.
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