Titanium alloy and annular titanium alloy forge piece forming method

Abstract

The invention discloses titanium alloy and an annular titanium alloy forge piece forming method. The chemical element content of the titanium alloy comprises, by weight, 7.50%-7.80% of A1, 1.00%-2.00% of Mo, 2.60%-2.80% of Zr, 2.60%-2.80% of Sn, 0.50%-1.50% of W, 0.10%-0.25% of Si, no more than 0.15% of Fe, no more than 0.10% of Cu, no more than 0.10% of Cr, no more than 0.10% of C, no more than 0.15% of O, no more than 0.04% of N, no more than 0.012% of H, and the balance Ti. The annular titanium alloy forge piece forming method comprises the following steps that after the titanium alloy is fed, and blanking is conducted at the temperature 30 DEG C below the phase transformation point; forming is conducted at the temperature 20 DEG C above the phase transformation point, and water cooling is conducted till the allay reaches the indoor temperature; double annealing is conducted on the materials obtained through the above two steps. The annular titanium alloy forge piece has the high-temperature tensile strength which can meet the use conditions and is large in affluence measure at the temperature ranging from 500 DEG C to 550 DEG C and can replace TC 25 to be used for manufacturing compressor parts and the like.

Description

technical field [0001] The invention relates to a forging method, in particular to a forming method of a titanium alloy and a ring forging thereof. Background technique [0002] TC25 titanium alloy is a heat-strength titanium alloy, which belongs to the Ti-A1-Zr-Sn-Mo-W-Si series deformation heat-strength titanium alloy. The nominal composition is: Ti-6.8A1-1.7Zr-2Sn-2Mo-0.7W -0.2 Si. TC25 titanium alloy can obtain ideal comprehensive properties under appropriate thermal deformation conditions and heat treatment system. The outstanding advantage of TC25 alloy is that its working temperature can reach 500~550°C, the working time can reach 6000 h below 500°C, and the working time can reach 3000 h at 550°C. Therefore, this alloy is often used in the manufacture of compressor parts, etc. [0003] The Chinese invention patent specification CN 103522007A published on January 22, 2014 discloses a method for forging a TC25 titanium alloy ring. The TC25 titanium alloy provided in t...

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Problems solved by technology

The mechanical properties of the TC25 titanium alloy ring formed by this method are excellent, but the high temperature tensile strength at 500°C and 550°C is low, which cannot meet the service conditions. Even if the high temperature tensile strength of some forgings can meet the use requirements, but its The amount of wealth is very small, and even the customer's physical and chemical failures have caused a lot of economic losses