The main results of the works of FGUP VIAM carried out within the framework of the program for the creation and adaptation of materials for the SLM technology are presented. The problems arising during the conversion of traditional alloys to additive manufacturing and related to the optimization of chemical composition and heat treatment conditions are considered. The directions and results of creating SLM materials, in particular aluminum- and iron-based alloys, are discussed. Such materials are compared with analogs produced by traditional technologies.

The works performed in FGUP VIAM to develop high-temperature cobalt- and nickel-based materials for the SLM technology are reviewed. They are compared with foreign analogs in terms of application and with the materials produced by traditional technologies. Promising works in the field of synthesizing high-temperature and intermetallic materials with a given texture are described.

The structure and characteristics of EP648 and VZh159 heat-resistant alloys synthesized by selective laser melting after HIP, aging, and simulated annealing for 500 h are compared. The disbalance of alloying of EP648 and VZh159 alloys is calculated. It is shown that a decrease in strength characteristics, an increase in ductility, and a decrease in the period between simulated annealing and fracture of EP648 alloy is related to a decrease in the volume fraction of the particles of the σ phase caused by precipitation of α-Cr particles. It is determined that the synthesized VZh159 alloy after simulated annealing is far superior to the EP648 alloy according to the set of mechanical characteristics owing to more balanced alloying.

Cobalt-based alloys are widely used for manufacturing of various components of gas turbine engines and gas turbines such as vanes and combustion chambers both in wrought state and as cast parts. They have been designed for improving the heat resistance due to solid solution and carbide-strengthening mechanisms. In order to obtain satisfactory oxidation resistance and hot corrosion resistance cobalt-based alloys are doped with sufficient amount of chromium (above 15 % wt.). Recently additive manufacturing has started to use cobalt-based alloys. The paper considers the features of the structure of high-temperature cobalt-based alloys and their application in various branches of industry.

The paper examines the microstructure and mechanical properties of experimental compositions of a heat-resistant cobalt superalloy, produced by the method of selective laser melting (SLM). Strengthening in the studied materials is achieved by the formation of a fine-celled structure of a solid solution based on cobalt and highly dispersed intermetallic and carbide phases. By the EMPA (electron micro probe analysis) method, the ratio of chemical elements in these phases was evaluated and their type was determined. It was estimated that the tantalum content determines the strength properties of the alloy. It was found that dispersed particles formed during the synthesis have a positive effect on the creep resistance at 800 °C temperature, whereas at 1100 °C temperature the destruction occurs along the boundaries of the persisted structure of synthesis, regardless of the alloying and morphology of structural components.

The evolution of the structural-phase state of the VZh159 alloy fabricated by selective laser melting after various types of thermal exposure and hot isostatic pressing (HIP) is studied. The effect of a long 500-h exposure at temperatures of 800 and 900°C on the phase composition and morphology of structural components is determined. The short-term and long-term strength of the material in various conditions are studied. It is shown that the segregation of dispersed particles of the σ phase after the gas-static treatment followed by aging and after prolonged exposure at high temperatures does not have a significant negative effect on the plastic and strength characteristics of the alloy. The long-term strength of the synthesized metal after the 500-h exposure at a temperature of 900°C corresponds to the certified values ​​for the deformed semifinished product of the VZh159 alloy.

The paper clarifies the influence of TIG and EB welding variants and highly temperature-resistant nickel superalloy VG159 being in a heat-hardenable condition without post-heat treatment on mechanical properties and structure of welded joints. The research trackles the problem of short- and long-term durability at a temperature of 850 and 870°С and covers the issue of resilience. The filler materials for argon-arc welding and relevant modes for electron-beam welding are selected. They provide a high complex of mechanical properties and an appropriate structure of welded joints

The state of stress in the welded joints of new nickel and titanium alloys in a high-pressure compressor during heat treatment is simulated. The QForm software package is used to simulate the results of heat treatment and to find heat-treatment conditions. The designed thermal locks made of nickel and titanium alloys are shown to minimize the technological risks of cracking and to retain the geometric sizes of the welded joints during heat treatment.

The microstructure and mechanical properties of three experimental compositions of a new heat- and corrosion-resistant cast cobalt-based alloy have been investigated. It is established that compositions are reinforced as a result of the formation of carbide phases in them during aging. It is shown that the ultimate and yield strength of this material at a temperature of 20°C are, respectively, 650(50) and 440(10) MPa. An analysis of the heat resistance of alloy samples has revealed that they withstand loads of 170 MPa (for 329 h) and 25 MPa (for 1093 h) at temperatures of 800 and 1100°C, respectively. The mechanical properties of the new alloy are superior of those of the foreign heat-resistant alloy FSX-414.

The laws of nitride phase formation are studied for the Ni-Co-Cr-W-Ti new class heat-resistant alloy, strengthened by volume nitriding. The data on kinetic features of behavior of the alloy during thermochemical treatment are obtained: the dependences of the extent of structural zones and particle size of the nitrides on the treatment time are found. A kinetic model of the volume nitriding process is proposed.