Single-crystal nickel-base superalloys are widely used as material for turbine blades in advanced aircraft engines and stationary gas turbines. As these elements are critical for flight safety much attention should be given for preventing the casting defects. However, dendritic structure and complex shape of turbine blades tend to create many growth defects. Therefore, the macroscopic investigation of the turbine blades is fundamental for preventing damage during service.

In the paper single-crystal turbine blade roots made of CMSX-4 have been investigated. Material for research was produced in Research and Development Laboratory for Aerospace Materials at Rzeszów University of Technology. Casts were obtained in ALD Vacuum Technologies by the Bridgman technique. One stage of solution heat treatment was then conducted on the samples. X-ray topography, Laue method, novel X-ray diffraction mapping and scanning electron microscopy were applied to study the crystal quality of the samples. It was found that in the root part of the blades the macroscopic low angle boundaries were present. The angles of subgrains misorientation were calculate from the X-ray topograms. Additionally, misorientation angles were defined from X-ray diffraction maps obtained by using the diffractometer of EFG company. By mapping the lattice parameter changes near the low angle boundary were presented. The presence of low angle boundaries were then confirmed by SEM . The mechanism of subgrains formation and influence of elements were described.

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