Fatigue crack propagation behaviour of inconel 718 structures built using directed energy deposition based laser additive manufacturing

J. Denny; A.N. Jinoop; C.P. Paul; R. Singh; K.S. Bindra

doi:10.1016/j.matlet.2020.128241

Fatigue crack propagation behaviour of inconel 718 structures built using directed energy deposition based laser additive manufacturing

J. Denny, A.N. Jinoop, C.P. Paul, R. Singh, K.S. Bindra

SCEDT Engineering

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

Abstract

Considering the wide applications of Laser Directed Energy Deposition (LDED) based Additive Manufacturing built Inconel718 (IN718) bulk structures, fatigue crack propagation (FCP) studies are performed on LDED built IN718 structures at two different scan strategies (Z-pattern-0 and Z-pattern-90) for the first time. Microscopic analysis shows that the built structures are defect-free with slightly fine dendritic growth for Z-pattern-90 samples. FCP tests reveal striations ≤ 200 nm and show about 2.5 times higher FCP resistance for Z-pattern-90 as compared to Z-pattern-0. FCP resistance of thus built samples is observed to be in between forged and Laser Powder Bed Fusion built samples. This study provides an understanding of the FCP behaviour of LDED built IN718 for various engineering applications.

Original language	English
Article number	128241
Journal	Materials Letters
Volume	276
DOIs	https://doi.org/10.1016/j.matlet.2020.128241
Publication status	Published - 1 Oct 2020

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title = "Fatigue crack propagation behaviour of inconel 718 structures built using directed energy deposition based laser additive manufacturing",

abstract = "Considering the wide applications of Laser Directed Energy Deposition (LDED) based Additive Manufacturing built Inconel718 (IN718) bulk structures, fatigue crack propagation (FCP) studies are performed on LDED built IN718 structures at two different scan strategies (Z-pattern-0 and Z-pattern-90) for the first time. Microscopic analysis shows that the built structures are defect-free with slightly fine dendritic growth for Z-pattern-90 samples. FCP tests reveal striations ≤ 200 nm and show about 2.5 times higher FCP resistance for Z-pattern-90 as compared to Z-pattern-0. FCP resistance of thus built samples is observed to be in between forged and Laser Powder Bed Fusion built samples. This study provides an understanding of the FCP behaviour of LDED built IN718 for various engineering applications.",

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T1 - Fatigue crack propagation behaviour of inconel 718 structures built using directed energy deposition based laser additive manufacturing

AU - Denny, J.

AU - Jinoop, A.N.

AU - Paul, C.P.

AU - Singh, R.

AU - Bindra, K.S.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - Considering the wide applications of Laser Directed Energy Deposition (LDED) based Additive Manufacturing built Inconel718 (IN718) bulk structures, fatigue crack propagation (FCP) studies are performed on LDED built IN718 structures at two different scan strategies (Z-pattern-0 and Z-pattern-90) for the first time. Microscopic analysis shows that the built structures are defect-free with slightly fine dendritic growth for Z-pattern-90 samples. FCP tests reveal striations ≤ 200 nm and show about 2.5 times higher FCP resistance for Z-pattern-90 as compared to Z-pattern-0. FCP resistance of thus built samples is observed to be in between forged and Laser Powder Bed Fusion built samples. This study provides an understanding of the FCP behaviour of LDED built IN718 for various engineering applications.

AB - Considering the wide applications of Laser Directed Energy Deposition (LDED) based Additive Manufacturing built Inconel718 (IN718) bulk structures, fatigue crack propagation (FCP) studies are performed on LDED built IN718 structures at two different scan strategies (Z-pattern-0 and Z-pattern-90) for the first time. Microscopic analysis shows that the built structures are defect-free with slightly fine dendritic growth for Z-pattern-90 samples. FCP tests reveal striations ≤ 200 nm and show about 2.5 times higher FCP resistance for Z-pattern-90 as compared to Z-pattern-0. FCP resistance of thus built samples is observed to be in between forged and Laser Powder Bed Fusion built samples. This study provides an understanding of the FCP behaviour of LDED built IN718 for various engineering applications.

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DO - 10.1016/j.matlet.2020.128241

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Fatigue crack propagation behaviour of inconel 718 structures built using directed energy deposition based laser additive manufacturing

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