Mechanics and physico-chemical processes in diffusion welding, soldering, strengthening of heat-resistant nickel alloys and dissimilar materials

What priority area of ​​science and technology does it correspond to: Fundamental scientific research on the most important problems of developing scientific, technical, socio-economic, socio-political, human potential to ensure the competitiveness of Ukraine in the world and the sustainable development of society and the state.

Research: fundamental

Future prospect: completed;

Research level: no analogues in Ukraine;

Availability of a patent: yes;

Brief description, advantages, further prospects for application.

New knowledge has been gained on the development of new solders, reinforcing materials and the formation of a stress-strain state (SSS) in joints with intermediate layers of solder and when using concentrated energy sources. It has been established that to improve the mechanical properties of brazed joints and resistance to high-temperature salt corrosion (HSC) of high-temperature nickel alloys of marine gas turbines, alloying with solder and tantalum is a promising way, which makes it possible to increase the concentration of chromium, which is the main element for ensuring stability. against VSK, without reducing the long-term strength of the compounds.

Alloying with tantalum materials for strengthening during surfacing of contact surfaces increases the resistance of materials against PSC and made it possible to optimize the composition of reinforcing materials and develop new materials KMH-2 and KMHS-2.

SSS studies made it possible to supplement the theoretical principles of the mechanics of joints with interlayers and showed that in the presence of plastic interlayers, not only the interlayer is strengthened, but also the redistribution of stresses unloading interlayers occurs.

The results of the study, theoretically and experimentally established provisions and regularities are the basis for the development of technologies for diffusion welding, brazing and surfacing of wear-resistant materials in the manufacture of offshore gas turbine units of a new generation, which ensure the use of new materials to increase the efficiency and service life of gas turbine engines. The developed solders and hardening materials have no analogues in world practice. Pilot testing of soldering and strengthening technologies with solders SBM-3 and SBM-4, and KMX-2 and KMXS-2, respectively, was carried out at the DP UPK “Zarya” – “Mashproekt”. Soldering of metal-ceramic assemblies was tested in NPP “Technobeam” and “Vitovaya”.


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