Establishment Of Ti₂AlNb Performance Database And Research On Spf Processing Of Abnormity Tube

With the rapid development of aviation and aerospace, it put forward higher requirements for high-temperature resistance and light weight properties. Because of its higher specific stress and better creep-resistant ability, the applications of Ti2 Al Nb-based alloy are more and more widely. In recent years, as the best lightweight high temperature structural material, Ti2 Al Nb-based alloy becomes more and more popular. With the deeper study on Ti2 Al Nb-based alloy, the properties of alloy constantly improve and gradually tends to be stable. Due to the difficulties in data sharing, every research institute must perform performance tests before further research, this will reduce the research efficiency greatly. Nowadays, the research emphasis concentrate on the basic performance tests and material preparation, the forming technologies for complex structures are rarely discussed. According to the above issues, this article carried out some researches in the following areas:Collecting the basic performance data of Ti2 Al Nb-based alloy; doing concept design, logic design, physical design and the function design for material database based on the design requirements; saving performance data to corresponding child database; carrying on database system development by using Visual Studio, achieves some functions, such as user login, user information management and corresponding data operations; the operation examples shows that the database is working properly, and can realize all functions.Analyzing the possible processing technologies based on the structure characteristics of abnormity tube; using finite element simulation software to predict the different forming processes, analyzing possible problems, then determine SPF as the best process technology. Evaluating the forming effect by observing the thickness distribution situation of forming structure, the results shows that the uniformity of thickness distribution is poor when the initial blank is cylinder shaped blank; conducting initial blank optimization by changing the shape of blank, the results of simulation shows that the thickness distribution is more excellent when the size of tapered tube are 135 mm and 190 mm, at present, the thickness distribution is 1.654mm~2.054 mm.Designing the forming module and determining the size of the blank according to the results of finite element simulation. Preparing cone blank by drum flat panel blank and edge welding, then conducting superplastic forming, analyzing the possible causes according to the processing procedure and corresponding solutions to optimize forming process.