METHOD FOR PRODUCING TiNi ALLOY WITH PREDICTABLE PROPERTIES USING ADDITIVE TECHNOLOGIES Russian patent published in 2022 - IPC B22F3/105 C22C1/04 B33Y10/00 B33Y70/00 C22C19/03 C22C14/00 

FIELD: additive technologies.

SUBSTANCE: invention relates to the field of additive technologies, in particular, the production of products of TiNi system alloys, having a shape memory effect by additive technology methods, also known by the term 4D printing. A method for additive production of TiNi system alloys includes providing powder of a TiNi system alloy, determining the exact chemical composition of powder and its temperature of martensitic transformations, loading powder into an installation of selective laser melting, and conducting selective laser melting to obtain an alloy. TiNi alloy powder is provided with a nickel content from 50.6 to 51.5 at. % and with a particle size from 15 to 53 mcm, selective laser melting to obtain an alloy is carried out with a distance between laser passes of 0.04-0.12 mm, a layer thickness of 0.03 mm, a scanning speed of 300-1250 mm/s, laser power from more than 200 to 250 W, and energy density during laser melting of no more than 200 J/mm³, wherein selective laser melting is carried out twice according to the same scanning geometry, and the above-mentioned parameters of selective laser melting are selected depending on required temperatures of martensitic transformation of the alloy.

EFFECT: defect-free alloy samples with predictable composition and temperatures of martensitic transformations are obtained by selective laser melting.

1 cl, 3 dwg