Property Development of EBM Processed Ti-6Al-4V Alloy Through Hydrogen Treatments

Date

2018-10-27

Author

Doğu, Merve Nur
Esen, Ziya
Tan, Evren
Gümüş, Berkay
Dericioğlu, Arcan Fehmi

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Ti-6Al-4V alloy attracts attention as the most preferred material in defense and aviation-space industries due to its low density, high specific strength and corrosion resistance as well as its high fatigue strength. In contrast to conventional techniques, production of very complex shaped Ti-alloys is possible at a single step using additive manufacturing (AM) techniques which also allow energy and time saving. Among these techniques, Electron Beam Melting (EBM) technique is capable of producing parts with relative densities over 99% with comparatively low residual stresses. However, a high temperature postprocess annealing heat treatment is inevitable to increase the ductility of the EBM manufactured component. The decrease in strength, possibility of distortion and microstructural coarsening are some of the drawbacks of such annealing processes. For this reason, in the present study, thermo-hydrogen treatment is used as an alternative post-process heat treatment for microstructural refinement, residual stress reduction and ductility improvement in EBM manufactured Ti-6Al-4V alloy parts without degrading the strength of the alloy. For this purpose, EBM manufactured samples were hydrogenated and dehydrogenated between 600 and 800 qC under Ar-H2 gas mixture atmosphere and high vacuum, respectively. Microstructural refinement and phase changes during the thermo-hydrogen treatment were characterized, and the effect of the thermo-hydrogen process on the mechanical properties was observed using micro-hardness tests.

URI

https://hdl.handle.net/11511/84600
http://www1.metalurji.org.tr/immc2018/01_NFMS/48.pdf

Conference Name

IMMC’19 International Metallurgy Materials Congress (25 - 27 Ekim 2018)

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

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Citation Formats

M. N. Doğu, Z. Esen, E. Tan, B. Gümüş, and A. F. Dericioğlu, “Property Development of EBM Processed Ti-6Al-4V Alloy Through Hydrogen Treatments,” 2018, p. 288, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/84600.