Structural-Phase Changes in Surface Layers of Elements Made of VT6 Titanium Alloy under Irradiation by High-Current Pulsed Electron Beam

摘要

Transmission electron microscopy (TEM), optical metallography, and electron probe microanal-ysis (EPMA) were used to study the chemical composition and microstructure of surface layers in blades made of VT6 alloy treated by a high-current pulsed electron beam at the energy density of the beam W= 18-20 J/cm~2. It is shown that the melting regime of irradiation leads to formation of a high-strength surface layer of up to 25 μm in thickness with a fine substructure. The increase in mechanical properties of the modified layer is caused by formation of fine α'- and α"-martensite plates oriented almost parallel to the blade surface.