Abstract
Electron beam melting technique is a kind of near-net shaping, environmentally friendly metal additive manufacturing technique, which can form high-performance metal parts with complex shapes. It has been widely applied in the aerospace industry, biomedical application, automobile manufacturing, and other fields. Ti-6Al-4V is the most widely researched and applied alloy in the additive manufacturing field, but its microstructure is diverse, and its mechanical properties vary greatly. In this study, the effect of process parameters on the microstructure and the resulting mechanical properties of Ti-6Al-4V alloy was researched. The results show that the yield strength of Ti-6Al-4V alloy with a bimodal microstructure is higher than those with a basketweave microstructure. Energy dispersion spectrum (EDS) line scan and area scan results show that there is no element enrichment for the specimens with the highest yield strength. A speed factor of less than 40 is a must for obtaining relatively dense Ti-6Al-4V parts built with electron beam melting. We have done basic research for the subsequent manufacturing of complex shape parts, which is helpful to promote the application of electron beam melting technology in the aerospace field.
Highlights
The electron beam has the advantage of high energy density, fast scanning speed, and no mechanical inertia
When taking a speed factor higher than 38, a huge number of pores were found at the top surface
Alloy produced by electron beam melting are studied, the following conclusions are preliminarily drawn: (1) Lamellar basket-weave microstructure and bimodal microstructure can be formed within Electron beam melting technology (EBM)
Summary
The electron beam has the advantage of high energy density, fast scanning speed, and no mechanical inertia. Electron beam melting technology (EBM) developed by Arcam is a metal additive manufacturing technology based on the scatter-accumulation principle, employing an electron beam as the energy source. This technology can produce components with high precision and complex shape as well as excellent properties, which has broad application prospects in the aerospace industry, biomedical application, and automobile manufacturing [1,2,3,4]. A significant amount of research has been carried out on the microstructure and mechanical properties of Ti-6Al-4V alloy formed by electron beam melting technology. Tan et al [11] found that α0 martensitic existed in the Ti-6Al-4V specimen. Lu et al [12]
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