Evolution of microstructure and mechanical properties of selective laser melted Ti-5Al-5V-5Mo-3Cr after heat treatments

Carlton, Holly D.; Klein, Kyle D.; Elmer, John W.

doi:10.1080/13621718.2019.1594589

Evolution of microstructure and mechanical properties of selective laser melted Ti-5Al-5V-5Mo-3Cr after heat treatments

Journal Article · Wed Apr 03 00:00:00 EDT 2019 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1080/13621718.2019.1594589· OSTI ID:1568029

Carlton, Holly D. ^[1]; Klein, Kyle D. ^[1]; Elmer, John W. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Titanium alloy Ti5553 (Ti-5Al-5Mo-5V-3Cr) is an excellent candidate for structural applications and additive manufacturing processes, since, unlike Ti6Al4 V, when built via selective laser melting and/or post additive manufactured welding, it maintains a near-beta microstructure that is both ductile and high strength. Another feature is that Ti5553 properties are adaptable through post build heat treatment. This study explores the heat treatability of selective laser melted Ti5553 up to temperatures approaching the β-transus. Here the results show strength increases while maintaining ductility at high temperatures (700–800°C), but embrittlement occurs at intermediate temperatures (400–600°C) likely due to changes in volume fraction and morphology of the α-phase and/or the presence of the ω-phase. Microstructure and X-ray diffraction are reported after heat-treating to better understand this mechanical response.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1568029

Report Number(s):: LLNL-JRNL--764337; 953825

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 5 Vol. 24; ISSN 1362-1718

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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