Analysis of Chip Geometry in Hot Machining of Inconel 718 Alloy

Abstract

In the present work, the effect of heating temperature on the workpiece surface in orthogonal machining of Inconel 718 on chip geometry in terms of chip segmentation, shear band configuration, and equivalent chip thickness has been studied through scanning electron microscope of chip roots. Chip segment characteristics are an important phenomenon as it directly influences the cutting force during machining processes. The workpiece was heated with two heating temperatures of 300 and 600 °C by burning mixture of liquefied petroleum gas and oxygen. It was observed that with an increase in heating temperature equivalent chip thickness, the degree of segmentation, and serration frequency decrease compared to room-temperature machining conditions. It was also observed that shear plane length, shear band thickness decrease, whereas space between the shear band increases with the increase in heating temperature.