High-Pressure Cooling in Finishing Turning of Haynes 282 Using Carbide Tools: Haynes 282 and Inconel 718 Comparison

Abstract

Despite the interest of industry in nickel-based superalloys and its main features (high temperatures resistance, hardness, low thermal conductivity, among others), even today they are still materials that are difficult to cut. Cutting tools withstand both high pressures and temperatures highly localized at the cutting area because of the elevated work hardening of the alloy and the problems for the cutting fluid to access the region, with the consequent strong tool wear. The use of cutting fluids at high pressures improves coolant access and heat removal. This paper analyzed the machining of Haynes 282 alloy by means of coated carbide tools under high-pressure cutting fluids at finishing conditions. Tests were developed at different cutting speeds and feeds quantifying the machining forces, surface roughness, tool wear, and tool life. Values of 45.9 min and Ra between 2 µm and 1 µm were obtained in this study for tool life and roughness, respectively, for the combination of cutting speed 50 m/min and feed 0.1 mm/rev. Likewise, a comparative analysis is included with the results obtained in previous works developed by the authors relating to the finishing turning of Haynes 282 and Inconel 718 under conventional pressure cooling. The comparative analysis with Inconel 718 is included in the study due to its importance within the nickel base superalloys being widely used in industry and widely analyzed in scientific literature.

Research on Cutting Layer Characteristics of Superalloy under High-Pressure Cooling

“…The results showed that under optimal coolant pressure, adhesion wear can be minimized. Díaz-Álvarez et al [22] studied the finishing turning of Haynes 282 under high-pressure cooling and found that under high-pressure cooling, when the cutting speed is 50 m/min and the feed is 0.1 mm/r, the workpiece can obtain the best surface finishes. Wang et al [23] found through experimental research on cutting the superalloy GH4169 with PCBN tools under high-pressure cooling that high-pressure cooling can reduce chip length, curl radius, and chip width.…”

Machinability Investigation of Nitronic 60 Steel Turning Using SiAlON Ceramic Tools under Different Cooling/Lubrication Conditions

“…Machining of hard-to-cut alloys such as titanium alloys and nickel-based super alloys is a challenging and troublesome task owing to the generation of higher cutting temperatures, as well as a difficulty in maintaining dimensional accuracy and minimizing surface roughness [ 2 , 3 , 4 , 5 , 6 ]. To machine the nickel-based super alloys effectively nontraditional machining techniques should be applied or at least machining variables and their range should be carefully selected [ 7 , 8 ].…”