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- W159490838 abstract "Nickel-based, creep-resistant, superalloy Inconel 718 is amongst the most difficult alloys tomachine. The main reason for the poor machinability of the alloy is the high work-hardeningrate by the precipitation of a γ’ phase and the presence of hard abrasive phases such astitanium carbide, niobium carbide and the Ni3AlTi phase. Generally, increasing the amount ofγ’ phase by increasing the amount of titanium and aluminum increases the rate of tool wear[1]. The nickel-based alloys also retain their strength at elevated temperatures and this resultin high cutting forces even at high cutting speeds for which high temperatures are generated[2].It is very complicated to predict tool life in end milling with sufficient accuracy on the basisof controllable process parameters. Nevertheless, it is an essential part of a machining systemin the automated factory to change tools automatically due to wear or catastrophic failure. Anumber of tool materials were used by the researchers in an attempt to increase machinabilityof Inconel 718 so far, such as, coated tungsten carbide, alumina (Al2O3), SiC whiskerreinforcedalumina and cubic boron nitrate (CBN) etc. [3],[4],[5]. Of these materials coatedtungsten carbide is the most widely used. Currently, it is estimated that over 80-85% of allcarbide tools sold are coated [6]. In general, coated tools perform better when machiningnickel-based superalloys due to the coatings increased hardness, ability to act as a barrier tothermal and atomic diffusion and by altering the coefficient of friction [7]. Derrien et al foundthat TiN coated tools resulted in higher tool life and lower surface roughness that uncoatedtools when milling Inconel 718 [8]. Gatto et al recommended that CrN and TiAlN coatingsimproved tool performance by acting as a thermal barrier and therefore preventing the hightemperature generated in the cutting process from softening the substrate [9]. TiAlN and CrNcoated carbide tools were compared in end milling of Inconel 718 by Sharman et al [10] and itwas found that TiAlN gave on an average three times better performance compared to CrN interms of metal removal, due to the lower hardness (lower abrasive wear resistance) andhigher chemical affinity of CrN to Inconel 718. It concluded that under conditions wherethermal rather than mechanical stresses predominate, the TiAlN coating would be expected togive better results." @default.
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- W159490838 date "2011-01-01" @default.
- W159490838 modified "2023-09-23" @default.
- W159490838 title "Wear mechanism in end milling of Inconel 718" @default.
- W159490838 hasPublicationYear "2011" @default.
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