Orthogonal Cutting of Ti-48at%Al Lamellar Structure Alloy

Abstract

The machinability, especially generation of surface defects, of Ti-47.7at%Al fully lamellar structure was examined by orthogonal cutting. Although surface defects were observed in every cutting condition, the machined surface tended to be significantly smoother as the depth of cut decreased 100µm to 20µm, and the rake angle of the tool was changed +5° to -5°. The surface defects were categorized into 2 groups depending on whether it is caused by lamellar layer, or lamellar colony boundary. It is discovered that the former is generated preferentially onto certain lamellar angle, and the latter showed no relation to the lamellar angle.