Influence of cutting insert (uncoated and coated carbide) on cutting force, tool-tip temperature, and chip morphology during dry machining of Inconel 825
Gobinda Chandra Behera, Thrinadh Jadam, Saurav Datta
Abstract
During metal machining, tool material (substrate as well as coating) plays an important role to influence machinability of any work material. Dry machining performance of ‘difficult-to-cut’ aerospace superalloy Inconel 825 is studied herein. Machining experiments are conducted at different cutting speeds using uncoated carbide, and MT-CVD TiCN-Al2O3 coated carbide inserts. Machining performance is assessed in purview of magnitude of cutting force, approximate tool-tip temperature, and quantitative chip morphological parameters. Performance of coated tool is compared to that of uncoated insert. It is estimated that coated tool causes 39.79% reduction in tangential cutting force (at cutting velocity ∼121 m/min) when compared to uncoated counterpart. Higher tool-tip temperature of the coated insert caused higher chip curling. Shear band microhardness of chip (obtained by using coated tool) appear higher than that of uncoated insert.