All-Russian Scientific-Research Institute of Aviation Materials, Moscow, Russia:

E. A. Lukina, Leading Researcher, e-mail: lukinaea@viam.ru

N. V. Petrushin, Chief Researcher

Bauman Moscow State Technical University, Moscow, Russia:

K. O. Bazaleeva, Assistant Professor

A. A. Bochvar High-Technology Scientific Research Institute for Inorganic Materials (VNIINM), Moscow, Russia:

E. V. Tsvetkova, First Category Engineer

This paper shows the investigation of the structure-phase state of heat-resistant nickel alloy ZhS6K-VI (ЖС6К-ВИ), obtained by selective laser melting with stochastic exposure technology (“chess” shading). Structural studies were carried out by scanning electron microscopy and Х-ray analysis. Phase composition was defined in the initial state and after heat and gas-static treatment. The supersaturated -solid solution and carbide particles MeC (Me = Ti, Mo, W) with FCC lattice are in the structure in the initial state after selective laser melting. Presence of forbidden reflections in the diffraction pattern finds a nickel solid solution ordering. During the additional heat treatment, the type of carbide particles on Me₆C is changed, and presence of strengthening γ'-phase (Ni₃Al) is fixed. Peculiarity of the structural state of heat-resistant nickel alloy after laser recrystallization is the presence of the following texture: -solid solution has a preferential orientation {100} in laser beam motion plane, and reflection (220) has a higher intensity at the crosssection. Pattern study in scanning electron microscope and microhardness measuring showed that during the heat treatment, thermal stresses are relaxing, γ'-solid supersaturated solution carry on with decaying and  -phase particle coagulation, reducing the alloy hardness.

These researches were carried out with the financial support of Russian Foundation for Basic Research (grant No. 14-29-10246), and with the financial support of the Ministry of Education and Science of Russian Federation within the subsidization agreement No. 14.595.21.0002 (August 22, 2014) (unique identifier No. RFMEFI59514X0002), using the equipment of the Center “Climatic testings of All-Russian Scientific-Research Institute of Aviation Materials”.

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