Formation of residual stresses in the surface layers of targets from heat-resistant titanium alloys by irradiation of high-current pulsed electron beams

摘要

The present paper reviews the experimental results dedicated by the effect of the irradiation with high-current pulsed electron beams under the melting regime on residual stresses creation taking place on the surface of titanium alloy targets (VT6, VT8, VT9, VT18U). Investigations of physical and chemical state in the surface layers before and after irradiation were made with the transmission electron microscopy, optical metallography, X-rays analysis and microhardness measurements. It was showed that irradiation with high-current pulsed electron beams under the melting stage of VT6 and VT8 alloys leads to formation the stress texture into the surface layer with thickness up to 20 μm. Irradiation of VT9 and VT18U alloy targets with 18-45 J/cmSUP2/SUP leads to formation of tensile residual stresses. It effects on the fatigue strength of titanium alloy parts.