Process design and microstructure properties evolution of titanium alloy shear spinning

Spinning is a metal deformation process that transforms a metal slab into a hollow shape. Because the spinning process has the advantages of small forming force, simple tooling, high material utilization rate, low production cost, good mechanical properties, etc., the spinning process is more and more used in aviation, aerospace, weapons, automobiles and other industries. As an excellent high temperature light alloy, Ti2AlNb alloy cone components can be used in aero engine inlet and other parts. Typical Ti2AlNB-based alloys are composed of O phase (Ti2AlNb, Cmcm symmetric structure), bcc B2 phase (ordered Pm3m symmetric structure)/β phase (disordered structure) and hcpα2 phase (Ti3Al, DO19P63 /mmc symmetric structure). The use temperature of Ti2AlNB-based alloy is 600-750℃, which is similar to that of Ni-based alloy, but the density is 1/3 lower than that of Ni-based superalloy. However, the evolution of phase composition, grain morphology and grain size of Ti2AlNB-based alloys during hot processing is quite complex, and the low ductility and poor formability of Ti2AlNB-based alloys at room temperature limit their wide application in industry. Hot spinning is an effective forming process to improve the formability and mechanical properties of axially symmetric hollow parts of refractory materials, but the spin forming of Ti2AlNb alloy has not been reported so far.