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Theses

Usinage cryogénique de l’alliage aéronautique : Inconel 718

Abstract : Nickel-based alloys are widely used in the manufacture of aerospace engine components due to their excellent high-temperature thermo-mechanical properties and good corrosion resistance. However, machining these materials is particularly difficult, mainly because they maintain their properties at high temperatures, but also because of their high chemical reactivity with most cutting tool materials and their low thermal conductivity, which leads to wear due to the high temperatures reached at the cutting edge. In this context, the use of cooling/lubrication systems are very relevant in order to improve productivity in machining.Thus, this research work focuses on cryogenic machining, which consists of projecting liquid nitrogen (LN2) or liquid carbon dioxide (LCO2) into the cutting zone to reduce the temperature. The aim is to reduce some wear mechanisms and increase tool life. However, the application of this lubrication system machining Inconel 718 has to date shown limitations in terms of tool life and surface integrity of the machined part, as opposed to Ti64 titanium alloy. It is therefore considered of great interest to discern the mechanisms responsible for the poor machinability of Inconel 718 in cryogenic machining in order to propose a suitable process window. To this end, the dynamic behavior of Inconel 718 at cryogenic temperatures is characterized in order to determine the metallurgical alterations that may occur in the machined part. Likewise, the surface integrity condition obtained is analyzed and a study is made of the fatigue behavior of drilled specimens under cryogenic conditions.
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Submitted on : Friday, May 20, 2022 - 4:53:11 PM
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  • HAL Id : tel-03674603, version 1

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Sana Chaabani. Usinage cryogénique de l’alliage aéronautique : Inconel 718. Autre. HESAM Université; Université de Mondragó, 2021. Français. ⟨NNT : 2021HESAE020⟩. ⟨tel-03674603⟩

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