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

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

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 (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.

Original language	English
Article number	106005
Journal	International Journal of Fatigue
Volume	143
DOIs	https://doi.org/10.1016/j.ijfatigue.2020.106005
State	Published - Feb 2021

Keywords

Directed energy deposition
Fatigue crack growth
Fracture mechanism
Heat-treatment
Inconel 718

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10.1016/j.ijfatigue.2020.106005

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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",

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year = "2021",

month = feb,

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

language = "英语",

volume = "143",

journal = "International Journal of Fatigue",

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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

AN - SCOPUS:85094320591

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

Abstract

Keywords

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