Deformation Behavior of a VT18U Titanium Alloy in the Oxidized State

Abstract

The influence of the isothermal annealing conditions in air (at 560 and 625°C for 1000 h) on the deformation behavior of a high-temperature VT18U titanium alloy under tension is studied. The plasticity of the alloy at room temperature decreases from 14 to ≈5% after annealing at the investigated temperatures. The thickness of the gas-saturated layer is 17 and 42 μm after annealing at 560 and 625°C, respectively. The main factor determining the plasticity of the alloy in the oxidized state is the oxygen content gradient in the gassaturated layer.

Study of oxygen content in titanium alloys after exposure at elevated temperature

“…In this study, we have shown a good correla on of data obtained by XRD and NMA methods. Ul mately, the difference in oxygen concentra on in gas-rich layer determines the deforma on behavior of the alloys [32,33], increasing oxygen concentra on in gas-rich layer leads to reduc on of duc lity of the oxidized alloys un l completely bri�le fracture in the elas c por on of load diagram. For example, VT18U and Ti6Al7Nb alloys in the oxidized condi on studied herein demonstrate tensile elonga on of 4.6 % and 13.2 % [32] respec vely due to the significant difference in oxygen concentra on in gas-rich layer (difference of concentra on near the oxide/metal interface 5 wt.…”

Development of Microstructure and Mechanical Properties of TiAl6V4 Processed by Wire and Arc Additive Manufacturing

“…Given the high oxygen affinity of titanium alloys, chips cannot remain in the material cycle and have to be disposed of. [5,[8][9][10][11] With regard to ecological aspects and to be able to achieve climate policy goals, a more eco-efficient manufacturing process for structural components is desirable. In addition, the demand for Ti-64 structural components for aircraft is expected to rise, thus, this problem will become increasingly important.…”