MAR-M-247 is a nickel-base superalloy developed for applications requiring high strength at elevated temperatures up to about 1000 ºC. Its balanced composition provides an excellent combination of tensile and creep-rupture properties as a result of gamma-prime strengthening enhanced by solid solution and grain-boundary strengthening. MAR-M-247 has good castability. It is usually used for turbine blades and turbocharger wheels castings. Heat treatment is usually applied.Different shape and weight of castings implies different conditions during solidifying and cooling resulting in different castings microstructure. When approving the castings, mechanical values are measured by tensile test on test bodies made from castings with different microstructure. This work investigates correlations between mechanical properties and microstructure, particularly grain size and texture, carbides, casting defects, and gamma-prime phase.Keywords: Superalloys, microstructure, mechanical properties, carbides
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