COMPOSITION MATERIAL FOR SURFACING ARTICLES AND METHOD FOR APPLYING IT

摘要

FIELD: manufacture of new parts and restoration of worn parts operating in condition of abrasive and percussion-abrasive wear by electron beam surfacing. ^ SUBSTANCE: method comprises steps of using for surfacing material on base of quick cut steel characterized by super-plasticity effect in temperature range 750 - 820C. Additives of tungsten carbide and titanium carbide provide increased volume of residual austenite or they provide completely the same austenite structure of matrix. At surfacing electron beam is scanned by two or more lines across motion direction of surfaced article in such a way that to melt material only in zone of first line action. Second and next lines of sweeping of electron beam due to controlling electric current of focusing, sustain temperature of welded on bead in interval of super-plasticity of quick cut steel. At wear testing meta-stable austenite of matrix promote relaxation of stresses of contact surfaces due to additional duct of deformation duct gamma - alpha of martensite conversion. ^ EFFECT: uniform structure along thickness of strengthened layer having no cracking, enlarged manufacturing possibilities of method, improved physical and mechanical properties of surfaced articles. ^ 2 cl, 1 tbl, 1 ex