Effect Of Forging Process On Microstructure And Properties Of Titanium Alloy Rods

     In recent years, With the expansion of the market, The titanium industry in china has made a repaid development.New titanium alloybrands are also being developed and applied.At present, The most widely used titanium alloy,at home and abroad, are TC4 (Ti-6A-4V), Ti-6Al-2Sn-4Zr-2Mo and so on. However, because the titanium alloy is more expensive, the smelting and processing are difficult, which result in the high cost of titanium, the price is 8-10 times of the steel. In some case, the price limits the application of titanium alloy.

    TC4 (Ti-6A-4V) alloy is a typical a+0 two-phase alloy. The alloy was developed in the US in 1950s, which has excellent comprehensive properties. It has excellent process plasticity and superplasticity. It is suitable for all kinds of pressure forming and has been widely applied in aviation and aerospace industry. It can be used to make all kinds of parts under 400 degree C of working temperature, accounting for more than half of the use of titanium alloy. In the late 1950s, China began to study and try to produce Ti-6Al-4V alloy. It was named TC4 alloy in 1970. The alloy is one of the most mature alloys produced and applied in many titanium alloys introduced and copied in China. Because the Mo and V in titanium alloy are isomorphous elements but relatively stable, molybdenum resource is rich in our country than the use of molybdenum vanadium resources, great potential. 

Ti-6Al-4V titanium bar

    The BTi62 titanium alloy ingot for three times melting of the vacuum self consumable arc furnace was used in the experimental materials. The 0 phase transition temperature of the ingot is 1000~1020 C. The ingot is forged in the 2500T fast forging machine, the 3150T water press and the SXP precision forging machine. Get the finished bar of 027.5mm. 

    TC4 (Ti-6Al-4V) alloy is mainly used for working temperature below 450 C. The purpose of the design of BTi62 titanium alloy is to replace the element V with the element Mo. The performance of the alloy is equivalent to that of TC4 (Ti-6A 4V). At present, the high temperature tensile index of TC4 alloy in national standard and national army standard is 400 C. So in the study of BTi62, the tensile properties of 400 C at high temperature were compared with that of TC4 with the same specification.