In our papers, the laser beam-aided control of the self-propagating high-temperature synthesis in Ni–Al systems for the layerwise manufacture of three-dimensional (3D) parts was offered and experimentally realized. As for the laser in situ synthesis of NiAl and Ni3Al intermetallides and their layerwise laser cladding without any visible cracks and pores, it was successfully performed later on. The present chapter is dedicated to the comparison of optimal conditions for the selective laser melting and laser direct metal deposition processes of the nickel-based powders and fabrication of a full-density, functionally graded, and crack-free structures on the maximum deposition rate for technological applications. The effects of laser parameters on the phase composition and microstructure of the resulting intermetallic samples will be discussed.The possibility of controlling to change the hardness of the gradient structures from layer to layer by changing of the powder composition and by using the reinforced intermetallic inclusions into superalloy matrix widens the range of possible applications of 3D parts in aerospace and nuclear industries. Comparing different methods of additive manufacturing reveals their advantages and disadvantages for making large samples, scalability, and customizability, finding ways to control the distribution of residual stresses and specified grain-growth direction for the fabrication of more functional and high-precision samples.
Shishkovsky, I. V., Nazarov, A. P., Kotoban, D. V., & Kakovkina, N. G. (2015). Comparison of Additive Technologies for Gradient Aerospace Part Fabrication from Nickel-Based Superalloys. In Superalloys. InTech. https://doi.org/10.5772/61121