The limitations of commonly used materials such as steel in withstanding high
temperatures led to exploring alternative alloys. For instance, Inconel 825 is a
nickel-based alloy known for its exceptional corrosion resistance. Thus, the
Inconel 825 is used in various applications, including aerospace, marine
propulsion, and missiles. Though it has many advantages, machining this alloy at
high temperatures could be challenging due to its inadequate heat conductivity,
increased strain hardening propensity, and extreme dynamic shear strength. The
resultant hardened chips generated during high-speed machining exhibit elevated
temperatures, leading to tool wear and surface damage, extending into the
subsurface. This work investigated the influence of varying process settings on
the machinability of Inconel 825 metal, using both uncoated and coated tools.
Optimal surface roughness (Ra) machining conditions were found by considering
factors such as depth of cut, cutting speed, feed rate, and other parameters.
The major objective of the present work was to enhance the machinability of
Inconel 825 by considering the surface finish values. The results revealed that
the favorable surface roughness (SR) values for machining Inconel 825 in an
automated lathe were attained under lubricated coated conditions with a cutting
speed of 100 m/min, feed rate of 0.06 mm/rev, and cutting depth of 0.7 mm.