Influence Of Process And Heat Treatment On The Microstructure Of 3D-Printed Ti-6Al-4V Alloys

Additive Manufacturing,generalized as 3D-printing deeply changed the way parts can be designed.This study presents a comparison of Electron Beam Melting(EBM)and Selective Laser Melting(SLM)of Ti-6Al-4V alloys and details their influence on the microstructure and the mechanical behavior.In addition,the influence of two treatments,the Hot-Isostatic Pressure(HIP)and the Annealing,will be developed.Electron Backscattered Diffraction(EBSD)and X-Ray Diffraction tests have been held to identify the microstructure related to each material,showing that EBM and SLM respectively results in lamellar ? with retained ? and martensitic ?' structures.Both treatments increased the rigidity and ductility.EBM sample presents a 21% increased Ultimate Tensile Strength(UTS)after HIP.However,for SLM samples,UTS has been reduced by 20% after annealing,mainly because of the transformation of the microstructure from martensitic ?' to lamellar ?+?.