Thickness reduction effects on the deformation mechanism and microscopic properties in electro-assisted pure titanium spinning

Since titanium has a hexagonal close-packed (hcp) crystal structure, spin forming at room temperature is difficult. Electro-assisted forming as a method can significantly improve the spin forming performance of pure titanium. In this study, we have established a simplified analytical model for stress analysis in the deformation zone during shear spinning of shaped parts. The effects of wall thickness reduction on the stress variation of the sheet flange and the forming quality of the spinning part are analyzed. Microscopic results have found that the growth rate of the α-phase nucleus is enhanced with the increase of the input current intensity. The increased current intensity causes the broken α-phase grains to recrystallize dynamically to form a relatively regular refined α-phase. Simultaneously, it was found that the microhardness of the spinning parts tends to decrease slightly with increasing current intensity.