Kazan National Research Technical University named after A. N. Tupolev, Kazan, Russia:

A. I. Gorunov, Assistant Professor of a Chair “Laser Technologies”, e-mail: gorunow.andrej@yandex.ru

This paper shows the results of studies of the effect of heat treatment at the temperatures of 550 and 1050 ^oC on the specimen structure, tribological properties of the introduction of rider, strength and plasticity under static as well as durability under cyclic bending loads. The objects of investigation are the nickel-based alloy specimens formed by direct metal deposition. Heat treatment increases the wear resistance of specimens produced by the emission of large carbides. Heating the nickel-based alloy specimens, previously obtained by direct metal deposition to a temperature of 1050 ^oC (soaking time 1.5 hours) leads to increased abrasion resistance, reduction in strength and ductility due to separation at the grain boundaries of hard carbides which are stress concentrators. Characteristic structural zones formed at direct metal deposition were studied. The sectional structure of specimens consists of alternating zones of columnar and differently oriented small crystals. It is found that the homogeneous structure of the alloy specimens 1535-30 heating to a temperature of 550 ^oC (soaking time 1.5 hours) leads to an increase in durability under cyclic bending loads, while maintaining unchanged wear characteristics. Research results proposed the mode of heat processing of specimens obtained by the method of direct metal deposition, reducing structural heterogeneity and improving the durability under cyclic bending load.
This work was carried out with the support of the Ministry of Education and Science of Russian Federation, the state contract (the 220-th resolution) No. 14.z50.31.0023, with the financial support of the Russian Federation for Basic Research; grant No. 16-33-80016 мол_эв_а and grant No. 14-29-10281 офи_м.

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