Microtexture in additively manufactured Ti-6Al-4V fabricated using directed energy deposition

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:734

Article

Waryoba, D. R.¹  Keist, J. S.²  Ranger, C.³  Palmer, T. A.^4,5 

[1] Penn State Univ, Engn, Appl Mat, Du Bois, PA 15801 USA

[2] Penn State Univ, Appl Res Lab, State Coll, PA 16804 USA

[3] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[4] Penn State Univ, Dept Engn Sci & Mech, 227 Hammond Bldg, University Pk, PA 16802 USA

[5] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

关键词: Additive manufacturing;    Directed energy deposition;    Ti-6Al-4V;    EBSD;    HIP;   

DOI  :  10.1016/j.msea.2018.07.098

来源: Elsevier

【 摘 要 】

The additive manufacturing (AM) of alpha + beta titanium alloys using electron beam (EB) and laser directed energy deposition (DED) processes has been widely characterized in both the as-deposited and post processed conditions. Fine basket weave alpha lath structures are commonly observed in both the as-deposited and post processed hot isostatically pressed (HIP) conditions for both laser and EB DED processes, but more in-depth knowledge of the crystallographic texturing and variant selection of the a laths growing from the primary beta-grains across the height of EB DED Ti-6Al-4V structures is not well established. At locations near the substrate in both conditions, microtexturing is weak, but EB DED builds exhibit a strong microtexture and pronounced variant selection with increasing build height. On the other hand, the laser DED builds displayed weak texturing and no prominent variant selection across all heights. With the addition of HIP post processing, there was no change in micro texturing of the coarsened alpha laths for both the laser and EB structures, and the same variant selection observed in the as-deposited EB DED builds was present.

【 授权许可】

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