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Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Description:

The microstructural evolution and mechanical properties of IN718 superalloy with different yttrium (Y) contents were investigated. In this study, three alloys containing 0wt%, 0.07wt%, and 0.58wt% of Y were fabricated by laser powder bed fusion (L-PBF). The experimental results showed that with a minor addition of Y content (0.07wt%), the tensile ductility at 650ºC increased from 10.3% to 20.3%, and the creep life increased from 203h to 1545h. The increased tensile ductility and creep life are attributable to the formation of fine MC carbides, which induce serrated grain boundaries, and to the strong affinity of Y for oxygen, resulting in the formation of Y2O3 to strengthen the grain boundaries. However, when the Y addition
increased (0.58wt%), the formation of a large Y-rich phase at the grain boundary reduced the tensile ductility and creep life.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Ni-based superalloy, Yttrium, Laser powder bed fusion, MC carbides, Tensile and creep propertie

Date published: 2024-01-02

Publisher:

Journal:

• Journal of Alloys and Compounds (ISSN: 09258388) vol. 978 173404

Funding:

• National Cheng Kung University
• Japan Society for the Promotion of Science 22H01366
• National Institute for Materials Science
• Amada Foundation AF-2018222-B3

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5144

First published URL: https://doi.org/10.1016/j.jallcom.2023.173404

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Updated at: 2025-02-20 09:48:00 +0900

Published on MDR: 2026-01-02 17:31:09 +0900