Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 27, Issue 12, Pages 6398-6406Publisher
SPRINGER
DOI: 10.1007/s11665-018-3722-y
Keywords
additive manufacturing; electron; high-speed direct laser deposition; microscopy; Ni-based alloys; phase composition; optical metallography
Categories
Ask authors/readers for more resources
Phase composition and structural features of nickel-based alloy EP741 obtained by high-speed direct laser deposition were discussed in the paper. The technology of high-speed direct laser deposition has been successfully applied during the formation of samples with the various operating parameters of the experimental device. The laser power was between 450 and 1200W, the scanning speed was 1.2mm/s, the powder feed rate was 45g/min, and the laser beam diameter was 1.2mm. The structure and phase composition of the initial material and as-deposited samples were studied using optical and scanning electron microscopy, x-ray analysis and transmission electron microscopy. The investigation has shown that spherical particles of powder (EP741) can be used to form products by additive manufacturing with the presence of additional heat treatment, since almost all the as-deposited samples obtained do not contain cracks, and large volume of pores was observed only in the sample obtained with the power of 450W. In addition, the phase composition of the as-deposited samples showed a high content of precipitating phase Ni-3(Al, Ti) in matrix, which is coherent to the solid solution based on nickel. In theory, the presence of Ni-3(Al, Ti) phase corresponds to the heat-treated nickel-base alloy obtained by standard methods of processing.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available