Optimizing the fatigue and fracture properties of additive manufactured β titanium alloy

Description:

This project intends to carry out research on the additive manufacturing process and post-processing processes of the β-Ti alloy materials and components produced by additive manufacturing with broad application prospects. To understand the effects of the printing processes and post-treatment processes on the defects and the microstructure, and to elucidate the rules and mechanisms of the coupling effects of microstructure and defect on high cycle fatigue properties and fracture toughness. This understanding is important to establish the relationship between the printing/post-treatment processes, the microstructure/defects, and the fatigue and fracture properties, and to develop and optimize the anti-fatigue and anti-fracture process of additive manufactured β-Ti alloy components. In addition, based on the microstructure optimization, this project plans to further improve the fatigue resistance of additively manufactured (AMed) Ti alloys by surface post-treatment combining with the strengthening equipment of surface shape adaptive impacting developed by our team independently and the traditional technology of shot peening and laser shock shot peening, and so as to finally achieve a significant improvement in the fatigue properties for typical 3D printing components. This cooperation project will not only expand the application of AMed β Ti alloys in the aviation field but also benefit the development of fatigue and fracture theory for defective materials, so it has an important engineering value and theoretical significance.