Abstract
Titanium alloys, such as Ti-6Al-4V alloy, fabricated by additive manufacturing processes is a winning combination in the aeronautic field. Indeed, the high specific mechanical properties of titanium alloys with the optimized design of parts allowed by additive manufacturing should allow aircraft weight reduction. But, the long term use of Ti-6Al-4V alloy is limited to 315 °C due to high oxidation kinetics above this temperature [1]. The formation of an oxygen diffusion zone in the metal and an oxide layer above it may reduce the durability of titanium parts leading to premature failure [2, 3]. In this study, Ti-6Al-4V alloy was fabricated by Electron Beam Melting (EBM). As built microstructure evolutions after Hot Isostatic Pressure (HIP) treatment at 920 °C and 1000 bar for 2h were investigated. As built microstructure of Ti-6Al-4V fabricated by EBM was composed of Ti-α laths in a Ti-β matrix. High temperature oxidation of Ti-6Al-4V alloy at 600 °C of as-built and HIP-ed microstructures was studied. This temperature was chosen to increase oxidation kinetics and to study the influence of oxidation on tensile mechanical properties. In parallel, two other oxidation temperatures, i.e. 500 °C and 550°C allowed to access to the effect of temperature on long-term oxidation.
Highlights
In the aeronautic field, reducing flight consumption of planes is one of the main objectives
Oxidation kinetics at 600°C of Ti-6Al-4V alloy fabricated by Electron Beam Melting (EBM) were characterized by weight gain measurements and are presented in Figure 2 (a)
The role of surface roughness on the oxidation kinetics is confirmed by the fact that all 12 samples fabricated by EBM present the same weight gains once ground with P600 paper (7 samples EBM P600 and 5 samples EBM Hot Isostatic Pressing (HIP) P600), as shown in Figure 2 (a)
Summary
In the aeronautic field, reducing flight consumption of planes is one of the main objectives Using lighter metals such as titanium alloys or additively manufactured parts with complex geometry are of interest. Sefer et al and Ciszak et al published ones of the few studies characterizing the oxidation behaviour of Ti-6Al-4V alloys at lower temperatures. Only two studies were published on the oxidation of titanium alloys Ti-5.5Al-3.4Sn-3.0Zr-0.7Mo-0.3Si-0.4Nb-0.35Ta wt% and Ti-6Al-4V wt% fabricated by additive manufacturing [20, 21]. No study was published on the influence of oxidation on mechanical properties of Ti-6Al-4V alloy fabricated by additive manufacturing. The oxidation behaviour of Ti-6Al-4V titanium alloy fabricated by EBM was studied. Influence of oxidation on tensile properties of an EBM Ti-6Al-4V alloy was investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
