The United Engine Corporation (UEC, part of Rostec) has revealed the directional crystallization technology for "growing" blades of PD-8 and PD-14 aircraft engines. With its help, UEC enterprises produce single-crystal blades for turbines of domestic fifth-generation aircraft engines PD-14 and PD-8 for passenger aircraft.
Turbine blades of jet aircraft engines of the first generations in the 1950s and earlier were made by stamping. These blades could operate at a gas temperature in front of the turbine of no 900-1000 degrees Kelvin. With the advent of more powerful engines, the gas temperature in front of the turbine increased.
To increase the heat resistance of the metal, new alloys began to be used for the manufacture of blades, which could no longer be stamped. Therefore, cast turbine blades became a new word in engine construction. They worked at higher temperatures and had a longer service life.
However, with this method, multiple equiaxed grains are formed in the structure of the casting. Fatigue failures can occur along the boundaries of these grains, which are located perpendicular to the axis of the acting centrifugal loads, which lead to blade breakage.
Engine manufacturers solved this problem and created a technology for directional crystallization of castings. The technology made it possible to "remove" transverse grain boundaries from the metal structure and produce castings with columnar grains that are elongated along the direction of the main force loads. Such blades are more resistant to the appearance of fatigue failures.
Earlier www1.ru reported that features of the Russian Su-34 and Su-24 were noticed in the first picture of the unique 6th generation J-36 fighter.
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