Effect of processing parameters on microstructure of laser solid forming Inconel 718 superalloy

•Fine and coarse columnar dendritic microstructure of as-deposited IN718 superalloy are respectively obtained.•The influence of the average widths of columnar grains of LSF IN718 superalloy is studied.•The tensile microstructure of as-deposited IN718 superalloy is proposed. The present work studies...

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Bibliographic Details
Published in:Optics and laser technology 2018-01, Vol.98, p.409-415
Main Authors: Zhu, L., Xu, Z.F., Liu, P., Gu, Y.F.
Format: Article
Language:English
Subjects:
Forming
Laser beams
Laser solid forming
Lasers
Laves phase
Mechanical properties
Microstructure
Nickel base alloys
Nickel based superalloys
Niobium
Process parameters
Studies
Superalloys
Tensile strength
Ultimate tensile strength
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Summary:•Fine and coarse columnar dendritic microstructure of as-deposited IN718 superalloy are respectively obtained.•The influence of the average widths of columnar grains of LSF IN718 superalloy is studied.•The tensile microstructure of as-deposited IN718 superalloy is proposed. The present work studies the influence of various parameters on the as-deposited Inconel 718 (IN718) superalloy using laser solid forming method. The microstructure and mechanical properties of IN718 superalloys were analysed. Fine and coarse columnar dendritic microstructure of as-deposited IN718 superalloy are respectively obtained at different laser power and laser beam diameter. The average widths of columnar grains of LSF IN718 superalloy enlarge with increasing laser power and laser beam diameter. The formation of Nb and Mo rich Laves phase in the inter-dendritic regions is found. The highest yield strength and ultimate tensile strength is about 729MPa and 936MPa, respectively.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2017.08.027