The invention discloses a near-
isothermal forging method of a TC17 biphase
titanium alloy disc
forge piece, comprising the steps of: heating a TC17
titanium alloy disposable bar
ingot to 30-75 DEG C below a
phase change point, upsetting the disposable bar
ingot into a disposable circular cake; heating the disposable circular cake to 20-60 DEG C over the
phase change point, and drawing out the disposable circular cake till the length thereof returns the length of the disposable bar
ingot to obtain a secondary bar ingot; heating the secondary bar ingot to 30-75 DEG C below the
phase change point, upsetting the secondary bar ingot to form a secondary circular cake, then
punching to form an annular blank; and heating the annular blank to 20-60 DEG C over the phase change point, heating an upper
forging mold and a lower
forging mold to 10-20 DEG C below the phase change point, and
forging and
stamping the annular blank by the upper forging mold and the lower forging mold under the pressure of 30-60mN to make the deformation degree of the annular blank reach 30-50% in the forging molds at a
strain rate of 0.001s-1 to 0.01s-1, and then forming a disc
forge piece on fire, wherein the heat treatment after forging is the combination of
solution treatment and
ageing treatment. The disc
forge piece forged by using the method has ideal electrical plating basket structure and high performance and is suitable for manufacturing forge pieces of an
air compressor chassis, a
turbine disc and the like of an aero-engine.