METHOD OF THE SURFACE HARDENING OF THE ARTICLES MADE OUT OF THE TITANIUM AND TITANIUM ALLOYS Russian patent published in 2008 - IPC C23C8/06 

FIELD: aircraft industry; mechanical engineering industry; other industries; methods of production process of the titanium constructions.

SUBSTANCE: the invention is pertaining to the field of the mechanical engineering industry, in particular, to the method of production process of the titanium constructions and may be used, for example, in the aircraft industry. The thermal processing is conducted in the active gaseous medium. Then they exercise the partial removal of the gas-saturated layer by pickling. At that, remove the part of the gas-saturated layer corresponding to double value of the depth of its area h possessing of the heightened friability. The depth of the area h is determined from the condition: , where K - the empirical coefficient considering the kinetic properties of the active gaseous medium, μm²/s; Е - the activation energy; R - the gaseous constant; T - the temperature of the thermal treatment- in °K; τ - the time of thermal treatment in seconds. The depth of the area h possessing of the heightened friability can be determined using the mean spacing interval l between the cracks formed in the gaseous layer at destruction of the sample by bending. The invention ensures simplification of the production process and manufacture of the article with the high cyclical strength.

EFFECT: the invention ensures simplification of the production process and manufacture of the article with the high cyclical strength.

3 cl, 2 ex