Drawability of Ti-6Al-4V Sheet at Elevated Temperatures

Abstract

Titanium and its alloys are difficult-to-form materials due to limited slip system and plastic anisotropy. Titanium is also prone to change in color due to oxidation at high temperatures. It is thus advisable to conduct deep drawing of titanium and its alloys at temperatures below 600°C. In this study, the drawability of Ti-6Al-4V sheet is evaluated in respect to the process parameters such as forming temperature, forming speed, and blank holding force at elevated temperatures. It is shown that the limit drawing ratio (LDR) increases with increasing temperature, but varies insignificantly with forming speed. The development of residual stresses in the wall of drawn cups during deformation was evaluated.

Deep Drawing of Ti6Al4V: Experiments and Modeling over a Wide Range of Strain Rates and Temperatures

“…The widespread use of titanium alloys for structural components in the aerospace industry is explained because of their high specific strength. However, the hexagonal close packed structure of titanium alloys, in which only the base plane can be moved at room temperature, has a low ductility [4]. Thus, many titanium alloy sheets are shaped, preferably by superplastic forming at elevated temperatures [5].…”

Effect of Lubricant Type on the Friction Behaviours and Surface Topography in Metal Forming of Ti-6Al-4V Titanium Alloy Sheets

“…Titanium alloy sheets are defined as hardto-form materials with respect to their high strength and formability characteristics [2]. Moreover, the hexagonal-close packed crystal structure of titanium alloys, in which only the basal plane can move, exhibits a low ductility and formability at room temperatures [3]. The limited wear resistance of titanium alloys makes them difficult to form because they are notoriously susceptible to galling in contact with other surfaces [4,5].…”