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

Northwestern Polytechnical University Xian
Nanchang Hangkong University

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

84 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 \textasciitilde{} 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",

month = feb,

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

language = "英语",

volume = "143",

journal = "International Journal of Fatigue",

issn = "0142-1123",

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TY - JOUR

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

UR - https://www.scopus.com/pages/publications/85094320591

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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