Microstructural control of additively manufactured Ti6Al4V via in-situ large-area laser annealing

Rietema, C. J.; Roehling, J. D.; Smith, W. L.; Bertsch, K. M.

doi:10.1016/j.scriptamat.2023.115823

Title: Microstructural control of additively manufactured Ti6Al4V via in-situ large-area laser annealing

Journal Article · 14 October 2023 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2023.115823 · OSTI ID:2202706

^[1]; Roehling, J. D. ^[1];

^[1]; Bertsch, K. M. ^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Additively manufactured (AM) alloy Ti6Al4V often exhibits a distinctive α/α’ microstructure due to the high cooling rates associated with AM, which can lead to increased brittleness and necessitate costly post-processing and heat treatment. In this work, we explore the use of layer-by-layer large area surface annealing with a secondary diode laser to control the microstructure of Ti6Al4V during AM and site-specifically induce more ductile, dual-phase α/β Ti6Al4V. Annealing treatments were selected to target sub- and super-β-transus temperatures at annealed layers, leading to 13% and 20% reductions in hardness, respectively, in the 2 mm below the annealed surfaces. Components with rapid switching between annealed and unannealed microstructures were also produced. Temperature measurements at the built surface and base plate were combined with a thermal model to validate microstructural observations, setting the stage for development of full 3-D microstructure and property control using in-situ laser annealing.

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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:: 2202706

Alternate ID(s):: OSTI ID: 2202550

Report Number(s):: LLNL-JRNL-853691; 1081565

Journal Information:: Scripta Materialia, Vol. 239; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
laser annealing
titanium alloys
thermal modeling
electron backscattering diffraction (EBSD)
phase transformations

Title: Microstructural control of additively manufactured Ti6Al4V via in-situ large-area laser annealing

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