Correlative Synchrotron X-ray Imaging and Diffraction of Directed Energy Deposition Additive Manufacturing
نویسندگان
چکیده
The governing mechanistic behaviour of Directed Energy Deposition Additive Manufacturing (DED-AM) is revealed by a combined in situ and operando synchrotron X-ray imaging diffraction study nickel-base superalloy, IN718. Using unique DED-AM process replicator, real-space enables quantification the melt-pool boundary flow dynamics during solidification. This knowledge was also used to inform precise measurements temporally resolved microstructural phases transformation stress development with spatial resolution 100 µm. quantified thermal gradient enabled dendritic solidification microstructure be predicted coupled state. fast cooling rate entirely suppressed formation secondary or recrystallisation solid-state. Upon solidification, stresses rapidly increase yield strength cooling. insight, large range IN718 suggests that accumulated plasticity exhausts ductility alloy, causing liquation cracking. has mechanisms govern highly non-equilibrium microstructures DED-AM.
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ژورنال
عنوان ژورنال: Acta Materialia
سال: 2021
ISSN: ['1873-2453', '1359-6454']
DOI: https://doi.org/10.1016/j.actamat.2021.116777