Tool wear and cutting forces when machining inconel 718 under cryogenic conditions: Liquid nitrogen and carbon dioxide
Communication avec acte
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 range of temperature and high corrosion and creep resistance. However, these materials induce several problems related to the shaping by machining due to essentially high heat resistance, high hardening tendency, high chemical affinity with tool material and low thermal conductivity leading to very high temperature in the cutting zone. In this context, assisted machining processes aim to improve the productivity of certain materials that are difficult to cut. Indeed, in order to keep the tool cold, it has been proposed to use cryogenic fluids (liquid nitrogen LN2 and carbon dioxide CO2 as coolant for effectively reducing temperatures since their vaporization temperatures are equal to -196°C and -75°C respectively. In this context, previous researches have focused on the study of the efficiency of this technique with respect to the machinability of several materials such as titanium alloys and nickel-based alloys. It has been shown that the tool life is improved when machining titanium alloys, unlike nickel-based alloys. For this reason, this paper is devoted to a comparison between two cryogenic fluids (LN2 and CO2) with regard to their effects on tool life when machining Inconel 718 considering as a reference the conventional lubrication. Results showed that tool life is the longest in conventional lubrication. However, under cryogenic conditions, tool life is the shortest in the case of LN2 condition whereas CO2 condition exhibits lower value compared to the traditional lubrication.
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Surface Integrity When Machining Inconel 718 Using Conventional Lubrication and Carbon Dioxide Coolant Communication avec acteCHAABANI, Sana; ARRAZOLA, Pedro José; AYED, Yessine; MADARIAGA, Aitor; TIDU, Albert; GERMAIN, Guénaël (Elsevier BV, 2020)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 ...
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 ...
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 ...
Article dans une revue avec comité de lectureSELA, Andres; ORTIZ-DE-ZARATE, Gorka; SOLER, Daniel; GERMAIN, Guénaël; ARISTIMUÑO, Patxi; ARRAZOLA, Pedro José (Elsevier BV, 2021)Finite Element Modelling used to predict machining outcomes needs to be supplied with the appropriate material thermomechanical properties which are obtained by specific testing devices and methodologies. However, these ...
Communication avec acteSELA, Andres; ORTIZ-DE-ZARATE, Gorka; SOLER, Daniel; ARISTIMUÑO, Patxi; SORIANO, Denis; GERMAIN, Guénaël; DUCOBU, François; ARRAZOLA, Pedro José (Elsevier BV, 2020)Surface integrity directly affects the mechanical behavior of the workpiece, which is especially relevant on fatigue behavior. To characterize the quality of the machined surface, aspects such as material damage, roughness ...