Scanning electron beam rotary polishing of column-faced Ti6Al4V

摘要

In order to reduce the surface roughness and improve the surface properties of column-faced Ti6Al4V, scanning electron beam was used for polishing and strengthening. The effects of electron beam rotary polishing on the surface morphology, microstructure and properties of column-faced Ti6Al4V were investigated. The results show that the surface roughness of column-faced Ti6Al4V after electron beam rotary polishing is 0.45 mu m, which is 93.8 % lower than the initial surface roughness of 7.24 mu m. The microstructure of the melted layer consists mainly of alpha' martensite, and the heat affected zone is composed of alpha' martensite, alpha phase and 8 phase. The circumferential microhardness of the column-faced Ti6Al4V after electron beam polishing is 454HV at the highest, which is 1.41 times higher than the matrix, and the radial hardness decreases non-linearly with increasing depth.