PROCEDURE FOR PRODUCTION OF NANO-STRUCTURED NICKEL-ALUMINIUM COATING ON STEEL WITH SHAPE MEMORY EFFECT Russian patent published in 2010 - IPC C21D1/78 B32B3/00 B23K9/04 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to deformation-thermal treatment of nickel-aluminium coating with shape memory effect and can be implemented in metallurgy, machine building and medicine. The procedure for production of nano-structured nickel-aluminium coating on steel with shape memory effect consists in applying coating by means of plasma surfacing powder of NiAl with shape memory effect, in tempering at temperature 1000-1200°C and in successive cooling in liquid nitrogen. Further, plastic deformation of coating is performed in three stages. At the first stage it is carried out in the interval of temperature 300-350°C at degree of plastic deformation ε=4.5-10%. At the first stage plastic deformation is performed in the interval of temperature 350-400°C at degree of plastic deformation ε=10-15%. At the first stage it is carried out in the interval of temperature 400-480°C at degree of plastic deformation ε=15-40%. Also annealing is carried out at temperature 500-600°C during 1-1.5 h after each stage of plastic deformation.

EFFECT: production of nano-structures coating NiAl with shape memory effect.

3 cl, 1 tbl, 1 ex