Surface Integrity When Machining Inconel 718 Using Conventional Lubrication and Carbon Dioxide Coolant
Communication avec acte
Surface integrity induced by machining process affects strongly the performance of functional products, for instance, the fatigue life as well as the resistance to stress corrosion cracking. Consequently, it is relevant to evaluate the induced properties on and beneath the machined surfaceto ensure the good performance of the mechanical components while operating under either static or cyclic loads. Furthermore, this is even more important when designing critical components that withstand high loads at high temperatures. In this context, many studies have been carried out in order to characterize the surface integrity (residual stresses, surface roughness, micro-hardness of the affected layer) when machining Inconel 718. However, so far, the cryogenic effect on surface integrity of Inconel 718 is not well established although some preliminary works have already been developed. Therefore, this work aimed to point out the performance of cryogenic machining using the carbon dioxide CO2 as a cryogenic cutting fluid, considering as a reference the conventional lubrication. A comparative study has been carried out during turning operations of Inconel 718 using the same cutting parameters and the same tool geometry. Microhardness measurements showed that the CO2 condition induced higher strain hardening near the surface while conventional condition did not generate notable difference compared to the bulk material microhardness. With respect to residual stresses, results showed that conventional lubrication generated higher tensile residual stress near the surface along the cutting direction when using new tools. As for CO2 cryogenic condition, lower tensile residual stresses have been obtained near the surface. In addition, CO2 condition induced the largest compressive peak when using new and semi−worn tools in comparison with conventional lubrication.
Files in this item
Showing items related by title, author, creator and subject.
Comparison between cryogenic coolants effect on tool wear and surface integrity in finishing turning of Inconel 718 Article dans une revue avec comité de lectureCHAABANI, Sana; ARRAZOLA, Pedro José; AYED, Yessine; MADARIAGA, Aitor; TIDU, Albert; GERMAIN, Guénaël (Elsevier, 2020)The most important challenges when machining difficult-to-cut alloys used in critical applications consist mainly in increasing tool life as well as improving the component surface integrity. In particular, the nickel based ...
Tool wear and cutting forces when machining inconel 718 under cryogenic conditions: Liquid nitrogen and carbon dioxide Communication avec acteCHAABANI, Sana; RODRIGUEZ, Iñigo; CUESTA, Mikel; AYED, Yessine; ARRAZOLA, Pedro José; GERMAIN, Guénaël (AIP Publishing, 2019)Nickel-based superalloys are widely exploited in turbojets components which are subjected to intense thermal and mechanical loadings during their operation. In fact, they exhibit excellent mechanical properties over a wide ...
A crystal plasticity-based constitutive model for near-β titanium alloys under extreme loading conditions: Application to the Ti17 alloy Article dans une revue avec comité de lectureBEN BOUBAKER, Houssem; MAREAU, Charles; AYED, Yessine; GERMAIN, Guénaël; TIDU, Albert (Elsevier BV, 2022-01-07)A crystal plasticity-based constitutive model is proposed to describe the thermo-mechanical behavior of the Ti17 titanium alloy subjected to extreme loading conditions. The model explicitly incorporates the effect of the ...
Impact of the initial microstructure and the loading conditions on the deformation behavior of the Ti17 titanium alloy Article dans une revue avec comité de lectureBEN BOUBAKER, Houssem; MAREAU, Charles; AYED, Yessine; GERMAIN, Guénaël; TIDU, Albert (Springer Verlag, 2019)In this work, the impact of the microstructure and the loading conditions on the mechanical behavior of a β-rich Ti17 titanium alloy is investigated. For this purpose, two different initial microstructures are considered ...
Inverse Identification of the Ductile Failure Law for Ti6Al4V Based on Orthogonal Cutting Experimental Outcomes Article dans une revue avec comité de lectureSELA, Andres; SOLER, Daniel; ORTIZ-DE-ZARATE, Gorka; GERMAIN, Guénaël; DUCOBU, François; ARRAZOLA, Pedro José (MDPI AG, 2021)Despite the prevalence of machining, tools and cutting conditions are often chosen based on empirical databases, which are hard to be made, and they are only valid in the range of conditions tested to develop it. Predictive ...