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    Öğe
    Heat assisted machining of superalloys
    (Altınbaş Üniversitesi / Lisansüstü Eğitim Enstitüsü, 2021) Munir, Talha; Türksoy, Armin
    Superalloys are vastly used in the aerospace industry due to their alluring properties such as maintaining their strength at high-temperature applications. Nevertheless, manufacturing these raw materials to the desired geometrical shapes is one of the main challenges of the subtractive manufacturing industry and they are categorized as hard-to-machine materials. Several approaches such as High-Speed Machining (HSM), Cryogenic cooling, Minimum Quantity Lubrication (MQL), and Heat Assisted Machining (HAM) are introduced to tackle this matter. HAM is a technique that introduces external heat sources to the workpiece (pre-heating or realtime heating methods) to increase the ductility of the superalloy and therefore reduce the yield and shear strength of the workpiece. By this means the machining parameters demonstrate an improvement compared to conventional machining. This study focuses on the research approaches conducted to evaluate the effect of the various heat source applications (Gas flame, Induction, Laser, and Plasma) on the material properties and the machinability of the superalloys. Additionally, the heating methodology and heat assistance impact on cutting parameters (forces, tool life, surface integrity, and chip morphology) are outlined. Finally, a comparison of the heat source efficiency and the economics of the various heat applications are performed. The analysis of the Finite element method on the orthogonal cutting of Inconel 718 was evaluated. The material behavior can observe by the constitutive model, the effect of high strain, strain rate, and temperatures on the equivalent flow stresses observed by the modeling of conventional and modified Jhonson-cook. The induction heat source considered and the analytical solution of induction power is evaluated. the heat-induced in the Inconel 718 workpiece concerning time is studied in detail. The induction heating of Inconel 718 is simulated by using the COMSOL multiphysics model. The effect of frequency and current on the temperature inside the material has been discussed. A comparison of the stress-strain curve of the Inconel 718 modeled, the temperature effect on the strain rate
  • [ X ]
    Öğe
    Heat-assisted machining of superalloys: A review
    (Springer Nature, 2021) Bijanzid, Armin; Munir, Talha; Abdulhamid, Farouk
    Superalloys are vastly used in the aerospace industry due to their alluring properties such as maintaining their strength at high-temperature applications. Nevertheless, manufacturing these raw materials to the desired geometrical shapes is one of the main challenges of the subtractive manufacturing industry and they are categorized as hard-to-machine materials. Several approaches such as high-speed machining (HSM), cryogenic cooling, minimum quantity lubrication (MQL), and heat-assisted machining (HAM) are introduced to tackle this matter. HAM is a technique that introduces external heat sources to the workpiece (pre-heating or real-time heating methods) to increase the ductility of the superalloy and therefore reduce the yield and shear strength of the workpiece. By this means, the machining parameters demonstrate an improvement compared to conventional machining. This review article focuses on the research approaches conducted to evaluate the efect of the various heat source applications (gas fame, induction, laser, and plasma) on the material properties and the machinability of the superalloys. Additionally, the heating methodology and heat assistance impact on cutting parameters (forces, tool life, surface integrity, and chip morphology) are outlined. Finally, a comparison of the heat source efciency and the economics of the various heat applications is performed.