Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition

Xiaobin Yu; Xin Lin; Hua Tan; Yunlong Hu; Shuya Zhang; Fencheng Liu; Haiou Yang; Weidong Huang

doi:10.1016/j.ijfatigue.2020.106005

Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition

Xiaobin Yu, Xin Lin, Hua Tan, Yunlong Hu, Shuya Zhang, Fencheng Liu, Haiou Yang, Weidong Huang

材料学院

科研成果: 期刊稿件 › 文章 › 同行评审

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摘要

In this study, Inconel 718 (IN718) specimens, manufactured by laser directed energy deposition (LDED), are subjected to three different heat-treatments to have different microstructural characteristics. Fatigue crack growth (FCG) testing is performed on both as-deposited and heat-treated specimens. The coarse Laves phases with uneven γ′′/γ′ precipitates severely decrease FCG resistance of LDED IN718. The soft precipitate-free zone around short-acicular δ-phase partly reduces FCG resistance of LDED IN718. The FCG threshold (ΔK_th) of a judicious heat-treatment specimen increases by ~ 2.6 times vs. as-deposited specimen and reaches 10.8 MPa∙m^1/2, and its ΔK_th and FCG curve are comparable to those of wrought IN718.

源语言	英语
文章编号	106005
期刊	International Journal of Fatigue
卷	143
DOI	https://doi.org/10.1016/j.ijfatigue.2020.106005
出版状态	已出版 - 2月 2021

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title = "Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition",

abstract = "In this study, Inconel 718 (IN718) specimens, manufactured by laser directed energy deposition (LDED), are subjected to three different heat-treatments to have different microstructural characteristics. Fatigue crack growth (FCG) testing is performed on both as-deposited and heat-treated specimens. The coarse Laves phases with uneven γ′′/γ′ precipitates severely decrease FCG resistance of LDED IN718. The soft precipitate-free zone around short-acicular δ-phase partly reduces FCG resistance of LDED IN718. The FCG threshold (ΔKth) of a judicious heat-treatment specimen increases by ~ 2.6 times vs. as-deposited specimen and reaches 10.8 MPa∙m1/2, and its ΔKth and FCG curve are comparable to those of wrought IN718.",

keywords = "Directed energy deposition, Fatigue crack growth, Fracture mechanism, Heat-treatment, Inconel 718",

author = "Xiaobin Yu and Xin Lin and Hua Tan and Yunlong Hu and Shuya Zhang and Fencheng Liu and Haiou Yang and Weidong Huang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2021",

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doi = "10.1016/j.ijfatigue.2020.106005",

language = "英语",

volume = "143",

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T1 - Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition

AU - Yu, Xiaobin

AU - Lin, Xin

AU - Tan, Hua

AU - Hu, Yunlong

AU - Zhang, Shuya

AU - Liu, Fencheng

AU - Yang, Haiou

AU - Huang, Weidong

PY - 2021/2

Y1 - 2021/2

N2 - In this study, Inconel 718 (IN718) specimens, manufactured by laser directed energy deposition (LDED), are subjected to three different heat-treatments to have different microstructural characteristics. Fatigue crack growth (FCG) testing is performed on both as-deposited and heat-treated specimens. The coarse Laves phases with uneven γ′′/γ′ precipitates severely decrease FCG resistance of LDED IN718. The soft precipitate-free zone around short-acicular δ-phase partly reduces FCG resistance of LDED IN718. The FCG threshold (ΔKth) of a judicious heat-treatment specimen increases by ~ 2.6 times vs. as-deposited specimen and reaches 10.8 MPa∙m1/2, and its ΔKth and FCG curve are comparable to those of wrought IN718.

AB - In this study, Inconel 718 (IN718) specimens, manufactured by laser directed energy deposition (LDED), are subjected to three different heat-treatments to have different microstructural characteristics. Fatigue crack growth (FCG) testing is performed on both as-deposited and heat-treated specimens. The coarse Laves phases with uneven γ′′/γ′ precipitates severely decrease FCG resistance of LDED IN718. The soft precipitate-free zone around short-acicular δ-phase partly reduces FCG resistance of LDED IN718. The FCG threshold (ΔKth) of a judicious heat-treatment specimen increases by ~ 2.6 times vs. as-deposited specimen and reaches 10.8 MPa∙m1/2, and its ΔKth and FCG curve are comparable to those of wrought IN718.

KW - Directed energy deposition

KW - Fatigue crack growth

KW - Fracture mechanism

KW - Heat-treatment

KW - Inconel 718

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U2 - 10.1016/j.ijfatigue.2020.106005

DO - 10.1016/j.ijfatigue.2020.106005

M3 - 文章

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SN - 0142-1123

VL - 143

JO - International Journal of Fatigue

JF - International Journal of Fatigue

M1 - 106005

ER -

Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition

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