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The IUP Journal of Mechanical Engineering
A Comparison of TiCN + Al2O3 + TiN and TiAlN Coated Carbide Tools for Machining of Inconel 718
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The paper aims at investigating the effect of cutting speed, feed rate and depth of cut on surface roughness and temperature generation at tool work interface. It also aims at investigating the cutting force and thrust force for different cutting speeds and feed rates for same depth of cut in dry turning of Inconel 718. It compares the performance of tools TiCN + Al2O3 + TiN and TiAlN coated carbide tool in dry turning of Inconel 718 and finds the optimum tool for machining of Inconel 718.

 
 

Inconel-based alloys compose over half of the material in the aerospace industry. They are best suitable for high speed turbine, thermoelectric power plant, nuclear power plant and high temperature applications. Due to its high corrosive resistance, it is also used in petroleum industries and pharmaceutical industry. These alloys are under constant improvement for better strength and surface integrity. Surface integrity is defined as inherent condition of machine surface and the major component can be grouped under surface texture, of which surface roughness is the most important, metallurgy and the residual stress generated on the surface and subsurface of machined workspiece. Inconel is heavily austenitic nickel chromium-based super alloys. Inconel 718 is a precipitation hardening nickel super alloy, which contains significant level of molybdenum, iron, columbium and niobium along with stresses of aluminum and titanium. Due to high amount of chromium and other alloying element, it is highly corrosive and its oxidation resistance is well-suited for service in hot and corrosive environment. When heated, Inconel 718 forms stable and adherent oxide layer that protects the surface for further attack. No other metal retains its strength up to 716 C but Inconel 718 (Nikaido and Vaara, 1985). It is very heat treatable and has a wide variety of mechanical properties, including hardness and strength (Pal et al., 1984). Additional usage includes turbine charger, rotor and seals, chemical processing and pressure vessels and steam generators in nuclear pressurized water reactors.

 
 

Optimization tool, Carbide tool.