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from root part of blades and containing the fragment of the selector, were studied. The eect of selector geometry on the dendrites growth and defects formation in the selector-root area of the blade were analyzed. The Laue diraction, scanning electron microscopy, and X-ray diraction topography were applied. It was found that, during crystallization of the selector, the dendrite cores, after reaching the surface of mould, may bend, if the angle between dendrite cores and the mould surface was equal to 12 . When the angle was equal to 24 the growth of dendrites has been stopped. It can be stated that the defects, which appeared in the selector were inherited by the root part.

Dendrite Growth in Selector-Root Area of Single Crystal CMSX-4 Turbine Blades