Microstructure Development in Electron Beam-Melted Inconel 718 and Associated Tensile Properties

Kirka, M. M.; Unocic, K. A.; Raghavan, N.; Medina, F.; Dehoff, R. R.; Babu, S. S.

doi:10.1007/s11837-016-1812-6

Title: Microstructure Development in Electron Beam-Melted Inconel 718 and Associated Tensile Properties

Journal Article · Fri Feb 12 00:00:00 EST 2016 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-016-1812-6· OSTI ID:1240558

Kirka, M. M. ^[1]; Unocic, K. A. ^[1]; Raghavan, N. ^[2]; Medina, F. ^[3]; Dehoff, R. R. ^[1]; Babu, S. S. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Arcam AB, Molndal (Sweden)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

During the electron beam melting (EBM) process, builds occur at temperatures in excess of 800°C for nickel-base superalloys such as Inconel 718. When coupled with the temporal differences between the start and end of a build, a top-to-bottom microstructure gradient forms. Characterized in this study is the microstructure gradient and associated tensile property gradient that are common to all EBM Inconel 718 builds. From the characteristic microstructure elements observed in EBM Inconel 718 material, the microstructure gradient can be classified into three distinct regions. Region 1 (top of a build) and is comprised of a cored dendritic structure that includes carbides and Laves phase within the interdendritic regions. Region 2 is an intermediate transition zone characterized by a diffuse dendritic structure, dissolution of the Laves phase, and precipitation of δ needle networks within the interdendritic regions. The bulk structure (Region 3) is comprised of a columnar grain structure lacking dendritic characteristics with δ networks having precipitated within the grain interiors. Mechanically at both 20°C and 650° C, the yield strength, ultimate tensile strength, and elongation at failure exhibit the general trend of increasing with increasing build height.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1240558

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Vol. 68, Issue 3; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 81 works

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Influence of build layout and orientation on microstructural characteristics of electron beam melted Alloy 718 Karimi, P.; Sadeghi, E.; Deng, D. The International Journal of Advanced Manufacturing Technology, Vol. 99, Issue 9-12 https://doi.org/10.1007/s00170-018-2621-6	journal	September 2018
Effect of Different Post-treatments on the Microstructure of EBM-Built Alloy 718 Goel, Sneha; Ahlfors, Magnus; Bahbou, Fouzi Journal of Materials Engineering and Performance, Vol. 28, Issue 2 https://doi.org/10.1007/s11665-018-3712-0	journal	October 2018
Applying neutron transmission physics and 3D statistical full-field model to understand 2D Bragg-edge imaging Xie, Q.; Song, G.; Gorti, S. Journal of Applied Physics, Vol. 123, Issue 7 https://doi.org/10.1063/1.5013676	journal	February 2018
Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718 Shassere, Benjamin; Greeley, Duncan; Okello, Alfred Metallurgical and Materials Transactions A, Vol. 49, Issue 10 https://doi.org/10.1007/s11661-018-4812-z	journal	July 2018
Modelling of anisotropic elastic properties in alloy 718 built by electron beam melting Kumara, Chamara; Deng, Dunyong; Moverare, Johan Materials Science and Technology, Vol. 34, Issue 5 https://doi.org/10.1080/02670836.2018.1426258	journal	December 2017
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