Electron-beam surface treatment of metal materials produced by additive method

A method for finishing the surface of metal materials manufactured by additive technologies with an intense pulsed electron beam, which can be an alternative to traditional processing methods is presented. The optimal irradiation modes for VT6 titanium alloy specimens produced by metal powder fusion and 308LSi stainless steel specimens produced by electron beam welding are determined. It is shown that the presented processing method leads to a visual decrease in porosity and a multiple decrease in the surface layer roughness (by 20 times (Ra)) of VT6 titanium alloy manufactured by an additive method. The surface roughness of 308LSi stainless steel specimens fabricated by electron beam welding decreases to 2.1 times in the longitudinal direction, to 5.2 times in the transverse relative to the surfacing plane. It is shown that the elemental composition, strength and tribological properties of the specimens do not change during irradiation in optimal modes. Tensile testing of irradiated specimens revealed an increase in tensile strength by 12%, ductility by 10% (VT6) and anisotropy of mechanical properties depending on the direction of tension relative to the surfacing plane (308LSi).

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