Сравнительный анализ электронно-лучевой сварки изделий из титанового сплава Ti-6Al-4V, полученных традиционными и аддитивными методами

Abstract

The microstructure and microhardness has been investigated in electron-beam welded Ti-6Al-4V alloy parts obtained by traditional manufacturing and additive manufacturing. Electron-beam welding produced three discriminative zones (FZ - the fusion zone, HAZ - the heat affected zone, BM - the base metal) in the welded material obtained by both rolled and EBF3 processes. The results of the research show that a grain size of the FZ and the HAZ depends on a grain size in the BM. Additionally, the FZ was typified by an entirely acicular [alpha]' microstructure formed by a displacive transformation within prior [beta] grains on cooling. The microhardness in the FZ reduced towards the HAZ upon increasing distance from the weld centre.