Fatigue assessment of as-built and heat-treated Inconel 718 specimens produced by additive manufacturing including notch effects

Klas Solberg; Di Wan; Filippo Berto

doi:10.1111/ffe.13300

Fatigue assessment of as-built and heat-treated Inconel 718 specimens produced by additive manufacturing including notch effects

Klas Solberg^*, Di Wan, Filippo Berto

^*Corresponding author for this work

Norwegian University of Science and Technology

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

40 Citations (Scopus)

Abstract

The fatigue behaviour of notched and unnotched specimens produced by additively manufactured Inconel 718 were analysed in the as-built and heat-treated conditions. The surfaces display high roughness and defects acting as fatigue initiation sites. In the as-built condition, fine subgrains were found, while in in the heat-treated state, the subgrains were removed and the dislocation density recovered. SN-curves are predicted based on tensile properties, hardness and defects obtained by fractography, using the (Formula presented.) -method.

Original language	English
Pages (from-to)	2326-2336
Number of pages	11
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	43
Issue number	10
DOIs	https://doi.org/10.1111/ffe.13300
Publication status	Published - 1 Oct 2020
Externally published	Yes

Keywords

Inconel 718
additive materials
fatigue
heat treatment
selective laser melting
small defects

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10.1111/ffe.13300

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title = "Fatigue assessment of as-built and heat-treated Inconel 718 specimens produced by additive manufacturing including notch effects",

abstract = "The fatigue behaviour of notched and unnotched specimens produced by additively manufactured Inconel 718 were analysed in the as-built and heat-treated conditions. The surfaces display high roughness and defects acting as fatigue initiation sites. In the as-built condition, fine subgrains were found, while in in the heat-treated state, the subgrains were removed and the dislocation density recovered. SN-curves are predicted based on tensile properties, hardness and defects obtained by fractography, using the (Formula presented.) -method.",

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AU - Solberg, Klas

AU - Wan, Di

AU - Berto, Filippo

PY - 2020/10/1

Y1 - 2020/10/1

N2 - The fatigue behaviour of notched and unnotched specimens produced by additively manufactured Inconel 718 were analysed in the as-built and heat-treated conditions. The surfaces display high roughness and defects acting as fatigue initiation sites. In the as-built condition, fine subgrains were found, while in in the heat-treated state, the subgrains were removed and the dislocation density recovered. SN-curves are predicted based on tensile properties, hardness and defects obtained by fractography, using the (Formula presented.) -method.

AB - The fatigue behaviour of notched and unnotched specimens produced by additively manufactured Inconel 718 were analysed in the as-built and heat-treated conditions. The surfaces display high roughness and defects acting as fatigue initiation sites. In the as-built condition, fine subgrains were found, while in in the heat-treated state, the subgrains were removed and the dislocation density recovered. SN-curves are predicted based on tensile properties, hardness and defects obtained by fractography, using the (Formula presented.) -method.

KW - Inconel 718

KW - additive materials

KW - fatigue

KW - heat treatment

KW - selective laser melting

KW - small defects

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JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 10

ER -

Fatigue assessment of as-built and heat-treated Inconel 718 specimens produced by additive manufacturing including notch effects

Abstract

Keywords

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