Experimental research on oxidation behavior when cutting Ti-5553 with cemented carbide and PCBN tools

Abstract

Ti-5553, with its high strength and toughness, has been widely used in the aerospace industry as a novel aerospace alloy. High hardness, strong chemical affinity, and low thermal conductivity are the main reasons for its classification as a difficult-to-cut material. Although significant work has been performed to analyze the machinability of Ti-5553, the oxidation behavior of Ti-5553 and tool materials during the cutting process has received little attention. For this study, cemented carbide (H13A) and PCBN (BZN9000) were selected as cutting tool materials with Ti-5553 as a workpiece material. Oxidation simulation experiments were carried out in a high-temperature resistance furnace. Changes in oxidation mass gain and hardness were measured and recorded. X-ray diffraction and scanning electron microscopy were employed to detect the oxidation products and micro-morphology of the oxide layer, respectively. Based on these measurements, the oxidation behavior of the materials was analyzed and the causes of oxidative wear of the tool and workpiece materials during the cutting process were identified to provide theoretical support for Ti-5553 cutting and tool development.