PSI - Issue 19

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Available online at www.sciencedirect.com

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Procedia Structural Integrity 19 (2019) 415–422

Fatigue Design 2019 Machining influence on the fatigue resistance of Inconel 718 fabricated by Selective Laser Melting (SLM) S. Periane 1,a* , A. Duchosal 1 , S.Vaudreuil 2 , H.Chibane 3 , A.Morandeau 4 , J.Cormier 5 , R. Leroy 1 1 Univ. Tours, Univ. Orléans, INSA CVL, LaMé, 7 Avenue Marcel Dassault, Tours 37200, France, 2 Euromed University of Fes, Morocco 3 INSA, Strasbourg, France 4 Sandvik Coromant, Rue Henry Garih, 37230 Fondettes, France 5 Institut Pprime, UPR CNRS 3346, Physics and Mechanics of Materials Department, ISAE-ENSMA, BP 40109, 86961, Futuroscope-Chasseneuil Cedex, France * natarajan.sasidharanperiane@etu.univ-tours.fr, Selective laser melting (SLM) is one of the most used additive manufacturing processes, using which complex parts can be built with high dimensional accuracy in a flexible manner with less material usage. The aerospace industry relies on SLM technique to manufacture components like turbine and compressor blades which has a high demand in its dimensional tolerance. Inconel 718 which is a nickel based super alloy used in steam turbine, jet engines where it is subjected to high thermomechanical loads. Inconel 718 is the most preferred alloy in the above applications due to its highest strength-to-weight ratio, its excellent resistance to fatigue, creep and corrosion. Inconel 718 is mainly strengthened by the precipitates which were formed during the heat treatment process by the combination of elements like Nb, Ti and Al along with the base element Ni. In this paper microstructure analysis of as-built and heat treated samples were done along with the evaluation of its mechanical characterization. Followed by the machining test under dry and emulsion conditions using the same cutting parameters. The surface integrity evaluation were done before performing four point bending fatigue test. The fatigue fracture of the sample corresponding to number cycles to failure along with the fractographic analysis of the dry and emulsion machined samples was investigated. The fatigue crack failure is compared to each process of machining to determine the best machining condition for Inconel 718. The best machining condition is dry compared to emulsion as it gives better surface roughness, more compressive residual stress due to which dry machined samples sustained more cycles to failure. Fatigue Design 2019 Machining influ nce on the fatigue esistance of Inconel 718 fabricated by Selective Laser Melting (SLM) S. Periane 1,a* , A. Duchosal 1 , S.Vaudreuil 2 , H.Chibane 3 , A.Morandeau 4 , J.Cormier 5 , R. Leroy 1 1 Univ. Tours, Univ. Orléans, INSA CVL, LaMé, 7 Avenue Marcel Dassault, Tours 37200, France, 2 Euromed University of Fes, Morocco 3 INSA, Strasbourg, France 4 Sandvik Coromant, Rue Henry Garih, 37230 Fondettes, France 5 Institut Pprime, UPR CNRS 3346, Physics and Mechanics of Materials Department, ISAE-ENSMA, BP 40109, 86961, Futuroscope-Chasseneuil Cedex, France * natarajan.sasidharanperiane@etu.univ-tours.fr, Abstract Selective l ser melting (SLM) is one of the most used additive manufacturing processes, using which complex parts can be built with high dimensional accuracy in a flexible manner with less material usage. The aerospace industry relies on SLM technique to manufacture components like turbin and compr ssor blades which has a high demand in its dimensional tolerance. Inconel 718 which is a nickel based super all y used in steam turbine, jet engines where it is subj cted to high thermomechanical lo ds. Inconel 718 is the most preferred alloy in the above applications due to its highest strength-to-weight ratio, its excellent resistance to fatigue, creep and corrosion. Inconel 718 is mainly strengthened by the precipitates which were formed during the heat treatment proces by the combin tion of elements like Nb, Ti and Al along with the base lement Ni. In thi paper mi rostructure analysis of as-built and heat treated samples were done along with t eval ation of its m chanical characterization. Followed by the machining test under dry and emulsion c nditions using the same utting p ram ters. The surface integrity evaluation were done before perf rming four point bending fatigue t st. The fatigue fr ture of the sample corresponding to number cycles to failure along with the fract graphic an lysis of the dry and emulsion machined sa les was investigated. The fatigue crack failure is co ared to each pr cess of machining to determine the best machining condition for Inconel 718. The best machining condition is dry compared to emulsion as it gives better surface roughness, more compressive residual stress due to which dry machined samples sustained more cycles to failure. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review u der responsibility of the Fatigue Design 2019 Organizers. Keywords: Inconel 718; SLM; Machining; fatigue cycles

Keywords: Inconel 718; SLM; Machining; fatigue cycles

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

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