Abstract
X-ray micro-computed tomography system has been used for visualization in two- (2-D) and three dimensions (3-D) of the dendrite structure and pores in single-crystals fabricated by Bridgman investment casting technique. The system described in the paper reconstructs 3-D geometry from a set of 2-D images obtained by multiple slicing of an X-ray radiography image. The results obtained in this study demonstrate the effect of withdrawal rate on the primary dendrite arm spacing and porosity in single-crystal made of CMSX-4 alloy.
Highlights
Working conditions in advanced gas turbine engines impose extremely demanding conditions on the engineering materials used for critical components such as the blades
Nickel-based singlecrystal superalloys are widely used for the blades in the first and second stages of the turbine with their extraordinary resistance to creep being assured by lack of the grain boundaries [1]
The creep resistance depends on the primary dendrite arm spacing and residual porosity, which is reduced to a low level, is difficult to be completely eliminated from single-crystal blades
Summary
Working conditions in advanced gas turbine engines impose extremely demanding conditions on the engineering materials used for critical components such as the blades. Nickel-based singlecrystal superalloys are widely used for the blades in the first and second stages of the turbine with their extraordinary resistance to creep being assured by lack of the grain boundaries [1]. The creep resistance depends on the primary dendrite arm spacing and residual porosity, which is reduced to a low level, is difficult to be completely eliminated from single-crystal blades. In spite of their small size, about a few ten of microns, pores significantly deteriorate the mechanical properties, especially the fatigue lifetime [4]
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