The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

Jacek Krawczyk; Włodzimierz Bogdanowicz; Jan Sieniawski

doi:10.3390/ma14010008

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

Materials (Basel). 2020 Dec 22;14(1):8. doi: 10.3390/ma14010008.

Authors

Jacek Krawczyk¹, Włodzimierz Bogdanowicz¹, Jan Sieniawski²

Affiliations

¹ Institute of Materials Engineering, University of Silesia in Katowice, 75 Pułku Piechoty 1a St., 41-500 Chorzów, Poland.
² Department of Materials Science, Rzeszów University of Technology, Wincentego Pola 2 St., 35-959 Rzeszów, Poland.

Abstract

In the present study, the dendrites deflection mechanism from the mold walls were subjected to verification regarding its heat-treated turbine rotor blades. The number of macroscopic low-angle boundaries created on the cross-section of the blades' airfoil near the tip was experimentally determined and compared to the number of low-angle boundaries calculated from a model based on the dendrites deflection mechanism. Based on the Laue patterns and geometrical parameters of airfoils, the number of low-angle boundaries occurring at the upper part of the blades airfoil after heat treatment was calculated. This number for the analyzed group of blades ranged from 5 to 9.

Keywords: X-ray topography; crystal growth; low-angle boundaries; superalloys; turbine blades.