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    Additively Manufactured Hastelloy-X: Effect of Post-Process Heat Treatment on Microstructure and Mechanical Properties

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    2021-077-Muhammad.pdf (1.156Mb)
    Date
    2021
    Author
    Muhammad, Muztahid
    Ghiaasiaan, Reza
    Gradl, Paul R.
    Schobel, Andre
    Godfrey, Donald
    Shao, Shuai
    Shamsaei, Nima
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    Abstract
    In this study, the effect of post-process heat treatment on the microstructure and mechanical properties of Hastelloy-X superalloy fabricated via two different additive manufacturing technologies, namely, laser beam powder bed fusion (LB-PBF) and laser powder directed energy deposition (LP-DED), is investigated. Microstructure was examined using scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis, while mechanical properties were evaluated by macro-hardness testing using the Rockwell B method. Microstructure of the alloys was studied thoroughly after several heat treatments that involve stress-relieving (at 1066°C for 1.5 hours), hot isostatic pressing (HIP at 1163°C for 3 hours under 103 MPa pressure), and/or solution treatment (at 1177°C for 3 hours). The results revealed that, for both LB-PBF and LP-DED Hastelloy-X, the post-process heat treatments resulted in uniform grain structure as well as partial dissolution of carbides, although they have different grain sizes.
    Department
    Mechanical Engineering
    Subject
    additive manufacturing
    Hastelloy-X
    microstructure
    grain size
    macrohardness
    URI
    https://hdl.handle.net/2152/90696
    http://dx.doi.org/10.26153/tsw/17615
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    • facebook
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    © The University of Texas at Austin