NUST Institutions Library Catalogue

A super alloy with high temperature resistance, high corrosion resistance, and high strength is
iconel-718, which is based on nickel. In the biomedical, aerospace, marine, and automotive
industries, nickel-based super alloys are frequently used. The super alloy inconel-718 is difficult
to machine and to cut. For greater surface roughness, little tool wear, and minimal burr formation,
which produces better results than conventional micro milling, a methodology using ultrasonic
assisted micro milling is developed to address this problem. This experimental investigation uses
0.5mm diameter cutting tools with various coatings, such as TiAlN, TiSiN, and nACo, to evaluate
the effects of various machining parameters on surface roughness, tool wear, and burr
development. With four levels and five parameters—cutting speed, feed rate, depth of cut, coating,
and amplitude of tool vibration—Taguchi L16 array is used to create experiments. The analysis of
variance is performed using Minitab software. It provides the percentage influence of each
element, and we can identify the best and worst set of parameters to achieve the desired results
using main effect plots. For multi-objective optimization, Grey Relational Analysis (GRA) is used
to determine the best and worst parameter levels for each of the three answers. Confirmatory
experiments revealed that ultrasonic aided micro milling produces better results than traditional
micro milling with an amplitude of vibration of 9 m.