Microstructural and machinability aspects of electron beam melted Ti-6Al-4V with different building orientations

Author(s)

Alves, U. C. ; Hassui, A. ; de Oliveira, M. F. ; Neto, P., I ; Ventura, C. E. H.

• Document type: Journal article
• Source: PROGRESS IN ADDITIVE MANUFACTURING; v. N/A, p. 11-pg., 2022-06-21.

Abstract

Considering the advantages of additive manufacturing processes regarding flexibility and the possibility of producing metallic components with characteristics similar to those obtained by conventional routes, electron beam melting (EBM) has been increasingly employed and its influencing factors have been investigated. Despite its benefits, further machining operations are still necessary to provide tight dimensional and geometric tolerances, as well as proper surface finish. In this context, this work aims to determine the influence of building orientation (vertical and horizontal) on the microstructure and machinability of Ti-6Al-4V produced by EBM process and to compare the results to those obtained with the same material produced by a conventional/commercial route. For this, workpieces were characterized by an analysis of their microstructure and mechanical properties. Moreover, surface characteristics and process forces were measured in turning experiments with different cutting speeds and feeds. Although surface roughness and cutting force have not been influenced by the distinct material characteristics, higher feed and radial forces could be associated with a lower percentage of beta-phase. Furthermore, considering the absence of thermal effects in hardness and tensile tests, a smaller grain size led to increased values of microhardness and tensile strength. (AU)

• FAPESP's process: 17/12309-7 - Multi-user equipment approved in grant 15/15622-2: microscope for three-dimensional image analysis
• Grantee: Carlos Eiji Hirata Ventura
• Support Opportunities: Multi-user Equipment Program