Влияние термомеханической обработки на структуру и свойства сварных соединений титанового сплава ВТ23

Abstract

The structure and mechanical properties of welded joints of VT23 titanium alloy received by method of laser welding with the subsequent thermomechanical treatment (TMP1 and TMP2) including ultrasonic mechanical forging were investigated. The results showed that the fatigue life of welded joints in TMP2 multiply increases compared with fatigue life of the welded connection samples in the delivery. The structure of the welded joint formed by laser welding has a gradient highly non-equilibrium coarse-grained structure based on a-phase. The structure with a defect density monotonically decreases with increasing distance from the surface into the material. As follows from a presented data, the fatigue life of the VT23 titanium alloy has increased more than threefold.