Post-processing of Ti-6Al-4V Additive Manufactured parts – microstructure and properties

David Wang Auditorium, 3rd floor Dalia Maydan Bldg.
Mr. Denis Zolotaryov, M.Sc. Candidate

Mr. Denis Zolotaryov, M.Sc. Candidate

Faculty of Materials Science and Engineering
Technion – Israel Institute of Technology Haifa 3200003, Israel

Ti alloys are advanced structural materials that exhibit a number of unique properties, including high specific strength, high-fatigue performance, high corrosion resistance etc. Ti-6Al-4V (Ti-6-4) is a wildly used titanium alloy, especially in aerospace industry. A relatively new production process called Additive Manufacturing (AM) has the potential to become a game-changer in the nearest future in many industries. Based on a layer-by-layer production process, this technology enables high flexibility in the production of components having complex geometry, superior properties and very low waste levels during production. In the last decade, Ti-6-4 has been a highly studied alloy for AM processes, from the point of view of the printability, microstructure and mechanical properties. But there is still lack of knowledge about the influence of post-processing on the properties and microstructure of AM produced parts. This study focuses on the effect of Laser Welding (LW) and Hot Isostatic Pressure (HIP) on the mechanical properties and microstructure of Ti-6-4 parts, produced by an Electron Beam Melting (EBM) system. The effect of the LW parameters on the welding performance was analyzed. The microstructural changes in the welded area and the resulting mechanical properties of the welded parts was studied. The influence of the HIP temperature regime on the mechanical properties and microstructure was investigated. The correlation between the microstructural features (lamellar thickness, phase fracture) and the mechanical properties of AM Ti-6-4, will be presented and discussed.

Advisor: Prof. Emeritus Menachem Bamberger