Microstructural Development in Inconel 718 Nickel-Based Superalloy Additively Manufactured by Laser Powder Bed Fusion

Huynh, Thinh; Mehta, Abhishek; Graydon, Kevin; Woo, Jeongmin; Park, Sharon; Hyer, Holden; Zhou, Le; Imholte, D. Devin; Woolstenhulme, Nicolas E.; Wachs, Daniel M.; Sohn, Yongho

doi:10.1007/s13632-021-00811-0

Title: Microstructural Development in Inconel 718 Nickel-Based Superalloy Additively Manufactured by Laser Powder Bed Fusion

Journal Article · Mon Jan 10 00:00:00 EST 2022 · Metallography, Microstructure and Analysis

DOI:https://doi.org/10.1007/s13632-021-00811-0· OSTI ID:1963949

Huynh, Thinh ^[1]; Mehta, Abhishek ^[1]; Graydon, Kevin ^[1]; Woo, Jeongmin ^[1]; Park, Sharon ^[1]; Hyer, Holden ^[1]; Zhou, Le ^[1]; Imholte, D. Devin ^[2];

^[2]; Wachs, Daniel M. ^[2]; Sohn, Yongho ^[1]

University of Central Florida, Orlando, FL (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Excellent weldability and high temperature stability make Inconel 718 (IN718) one of the most popular alloys to be produced by additive manufacturing. Here in this study, we investigated the effects of laser powder bed fusion (LPBF) parameters on the microstructure and relative density of IN718. The samples were fabricated with independently varied laser power (125 - 350W), laser scan speed (200 - 2200 mm/s), and laser scan rotation (0° - 90°). Archimedes’ method, optical microscopy, and scanning electron microscopy were employed to assess the influence of LPBF parameters on the relative density and microstructure. Optimal processing windows were identified for a wide range of processing parameters and relative density greater than 99.5% was achieved using volumetric energy density between 50 and 100 J/mm3. Microstructural features including melt pool geometry, lack of fusion defect, keyhole porosity, and sub-grain cellular microstructure were examined and quantified to correlate to LPBF parameters. A simple empirical model was postulated to relate relative sample density and LPBF volumetric energy density. Melt pool dimensions were quantitatively measured and compared to estimations based on Rosenthal solution, which yielded a good agreement with the width, but underestimated the depth, particularly at high energy input, due to lack of consideration for keyhole mode. In addition, the sub-grain cellular-dendritic microstructure in the as-built samples was observed to decrease with increasing laser scan speed. Quantification of the sub-micron cellular-dendritic microstructure yielded estimated cooling rate in the order of 10⁵ – 10⁷ K/s.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1963949

Report Number(s):: INL/JOU-21-65135-Revision-1; TRN: US2313184

Journal Information:: Metallography, Microstructure and Analysis, Vol. 11, Issue 1; ISSN 2192-9262

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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