Cracks formation in nickel-based single crystal alloy manufactured by selective laser melting

Cracks formation in nickel-based single crystal alloy manufactured by selective laser melting

Borisov, Evgenii (St. Petersburg Polytechnic University)
Starikov, Kirill (St. Petersburg Polytechnic University)
Popovich, Anatoly (St. Petersburg Polytechnic University)
Popovich, V. (TU Delft (OLD) MSE-5; St. Petersburg Academic University)

2020

The aim of this study was to determine the influence of selective laser melting (SLM) process parameters on the formation of cracks in nickel-based single crystal alloy. Several sets of laser scanning parameters, with varied laser power, scanning speed and hatch distance, thus resulting in different volumetric and linear energy densities, were investigated. The relationship between energy density, specimen densification, cracks formation and evolution of directional microstructure was shown. It was found that higher linear energy density results in fewer cracking and defects. Cracking in lower energy samples was attributed to the formation of thermal shrinkage pores in the interdendritic spaces and precipitation of Ta, Mo and Nb carbides along the dendrites boundaries.

Additive manufacturing
Crack formation
Ni single crystal alloys
Selective laser melting

http://resolver.tudelft.nl/uuid:dc5b5a86-d6de-40fa-a6c9-9d2c85fdfd48

https://doi.org/10.37904/metal.2020.3625

TANGER Ltd.

978-80-87294-97-0

Proceedings of the 29th International Conference on Metallurgy and Materials, Conference Proceedings (METAL 2020 )

29th International Conference on Metallurgy and Materials, METAL 2020, 2020-05-20 → 2020-05-22, Brno, Czech Republic

Institutional Repository

conference paper

© 2020 Evgenii Borisov, Kirill Starikov, Anatoly Popovich, V. Popovich