EFFECTS OF CUTTING FLUID APPLICATION IN THE PERFORMANCEOF THE INCONEL 718 TURNING

Resumo

The objective to remain in the global market companies are investing in the search for processes that
ensure high productivity at low cost and minimal impact to the environment. Thus the industrial and
technological development has increased the search for high-performance machining processes and that
generate low damage and tool wear, as well as lower utilization of fluids. Regarding nickel-based superalloys,
they have an extremely important role in the aeronautical and automotive industries among others. The
superalloy studied is the Inconel 718 on the hot-rolled condition, material of difficult machining that has high
mechanical strength and corrosion resistance at elevated temperatures. The objective of this work is to study the
influence of the application of cutting fluids in turning and the machining parameters in order to achieve high
performance and optimization of machining this alloy. The superalloy was machined by external cylindrical
turning using various cutting parameters: cutting speed (75 and 90 m/min), feed rate (0,15 and 0,18 mm/rev),
cutting depth (0,8 mm), Minimum Quantity Fluid (MQF), abundant cutting fluid and coated cutting tools. After
turning chip samples were obtained, was measured the surface roughness, chip volume removed, cutting length
and macrostructural analyzes were performed and of lifetime of the tools used in order to detect possible wear, as
well as, microstructural analyzes of the chips and the samples by optical microscopy, scanning electron
microscopy (SEM) and energy dispersive spectroscopy (EDS).In this work can observe the behavior of the
materials and tools in the two lubri-cooling conditions used, as well as, the impacts of the parameter variations
in the surface finish, on the structure of the material and performance of the tools.