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Study of the Thermal History upon Residual Stresses during the Dry Drilling of Inconel 718

Article dans une revue avec comité de lecture
Author
CHENEGRIN, Kévin
698 Laboratoire de Tribologie et Dynamique des Systèmes [LTDS]
ccBOUSCAUD, Denis
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
GIRINON, Mathieu
302796 Centre technique des industries mécaniques [Cetim, France] [Cetim]
KARAOUNI, Habib
505477 Safran Tech
BERGHEAU, Jean-Michel
698 Laboratoire de Tribologie et Dynamique des Systèmes [LTDS]
FEULVARCH, Eric
698 Laboratoire de Tribologie et Dynamique des Systèmes [LTDS]

URI
http://hdl.handle.net/10985/24963
DOI
10.3390/met12020305
Date
2022-02
Journal
Metals

Abstract

The main objective of this article was to show for the first time that heat transfer plays a major role in residual stress generation during the dry drilling of Inconel 718, and to propose a numerical strategy capable of simulating such thermo-mechanical phenomena. An X-ray diffraction (XRD) analysis shows that without lubrication, high tensile residual stresses can be observed on the surface of a deep through drilled hole. Such a situation can be highly detrimental for the fatigue lifetime of a mechanical component. A thermal history in five phases is first identified by means of temperature measurements exhibiting an overheating of approximately 500 ∘C on the created hole surface just before the end of the drilling operation. A 3D thermo-viscoplastic model is herein improved in terms of boundary conditions to show that this phenomenon is triggered by the progressive decrease in the Inconel 718 volume under the cutting zone. To the authors’ knowledge, such a phenomenon has never been reported and simulated before in the literature. Then, a 3D thermo-elasto-plastic simulation including elasticity is proposed to compute residual stresses from the thermal results of the previous model. It shows for the first time that the overheating stage induces sufficiently intense plasticity to produce high tensile residual stresses of approximately 900 MPa as we experimentally observed.

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