Актуальные проблемы в машиностроении Том 4 №2 2017

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Actual Problems in Machine Building. Vol. 4. N 2. 2017 Materials Science
in Machine Building
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FEATURES OF THE PHASE COMPOSITION OF THE MATERIAL,
OBTAINED BY HETEROPHASE POWDER METALLURGY
OF Ni-BASED ALLOY
Rashkovets М. V., Graduate students, e-mail:
Nikulina A. A., Ph.D. (Engineering), Associate Professor, e-mail:
Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian
Federation
Abstract
In this paper considers feature of structural and phase composition of initial powder and
deposited samples which are Ni-based alloy in according with various operating parameters of
device of heterophase powder metallurgy. The microstructure of the longitudinal section of the
deposited samples is dendritic structure without defects. Almost combination of operating
parameters selected in this study produced samples without defects, except only for samples
obtained by 250 W of laser power with unmelted particles of initial materials. Layer thickness and
laser power have a liner relation. The X-ray diffraction patterns and date of transmission electron
microscopy of initial powder and deposited samples show the presence of Ni-matrix (fcc) solid
solution. And, for now, particles of Nb2C and Nb6C5 were identified by transmission electron
microscopy.
Keywords
heterophase powder metallurgy, direct laser method deposition, Ni-based alloys, structure, phase
composition