Performance of Ti6Al4V fabricated by electron beam and laser hybrid preheating and selective melting strategy

Electron beam selective melting (EBM) and laser (SLM) are regarded as significant manufacturing processes for near-net-shaped Ti6Al4V components. Generally, in the conventional EBM process, preheating is necessitated to avoid “smoke” caused by charging of electrons. In SLM an energy source without risk can be employed melt metal powder at low temperatures. However, because absorption rate laser, bed temperature cannot reach a high level. It difficult obtain as-built TiAl4V with favorable comprehensive properties via or SLM. Hence, two types electron hybrid (EB-LHP) combined strategies proposed. Using preheat allows performed (EBM-LT), whereas using (SLM-HT). samples fabricated different (i.e., EBM-LT SLM-HT) processes, i.e., (EBM-HT) (SLM-LT). The temperature-dependent surface quality, microstructure, density, mechanical characterized compared. Results show that exhibits higher ultimate tensile strength (981±43 MPa) lower elongation (12.2%±2.3%) than EBM-HT owing presence α′ martensite. SLM-HT possesses highest (1,059±62 (14.8%±4.0%) comparable (16.6%±1.2%).