Surface Finishing of Additive Manufactured Ti-6Al-4V Alloy: A Comparison between Abrasive Fluidized Bed and Laser Finishing

Materials

Gianluca Rubino¹  Erica Menna²  Federica Trovalusci²  Silvio Genna²  Eleonora Atzeni³  Alessandro Salmi³ 

[1] Department of Economics, Engineering, Society and Business Organization, Largo dell’Università, Università della Tuscia, 01100 Viterbo, Italy;Department of Enterprise Engineering, Università degli Studi di Roma “Tor Vergata”, Via del Politecnico 1, 00133 Roma, Italy;Department of Management and Production Engineering, Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy;

关键词: laser finishing;    fluidized bed;    surface roughness;    fatigue;    EBM;    Ti-6Al-4V;   

DOI  :  10.3390/ma14185366

来源: DOAJ

【 摘 要 】

Metal additive manufacturing is a major concern for advanced manufacturing industries thanks to its ability to manufacture complex-shaped parts in materials that are difficult to machine using conventional methods. Nowadays, it is increasingly being used in the industrial manufacturing of titanium-alloy components for aerospace and medical industries; however, the main weakness of structural parts is the fatigue life, which is affected by surface quality, meaning the micro-cracking of small surface defects induced by the manufacturing process. Laser finishing and Abrasive Fluidized Bed are proposed by the authors since they represent cost-effective and environment-friendly alternatives for automated surface finishing. A comparison between these two finishing technologies was established and discussed. Experimental tests investigated both mechanical properties and fatigue performances. The tests also focused on understanding the basic mechanisms involved in fatigue failures of machined Ti-6Al-4V components fabricated via Electron Beam Melting and the effects of operational parameters. X-ray tomography was used to evaluate the internal porosity to better explain the fatigue behaviour. The results demonstrated the capability of Laser finishing and Abrasive Fluidized Beds to improve failure performances. Life Cycle Analysis was additionally performed to verify the effectiveness of the proposed technologies in terms of environmental impact and resource consumption.

【 授权许可】

Unknown