Heat treatment method of TC4 and TC11 titanium alloy forgings

               
Update: 05-03-2021
               
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TC4 titanium alloy is an alloy of titanium, which is th […]

TC4 titanium alloy is an alloy of titanium, which is the metal element of titanium alloy rods. It is a Ti-Al-Sn-Zr-Mo-W-Si alloy series α+β type heat-strength titanium alloy with excellent comprehensive functions. It combines the high-strength thermal properties of TA2 alloy and the thermal stability of TA1 alloy, and is suitable for long-term work at 500-550°C.
   It is reported that the working time can reach 6000h below 500℃ and 3000h at 550℃. Therefore, TC4 titanium alloy is an ideal heat-strength titanium alloy for engines, and can be used to manufacture compressor parts for aviation engines. The alloy can be processed into forgings, bars, die forgings and other forms of products.
   Researchers studied the effects of different solution temperatures and cooling methods on the structure and function of BT25 titanium alloy forgings. The results show that at the uniform solution temperature, the air-cooled microstructure is smaller than that of the furnace-cooled. The solid solution temperature is above the phase transition temperature, and the air-cooled one has higher strength than the furnace-cooled room temperature, but the impact toughness and plasticity index change little. The phase transition temperature is above the solid solution temperature. The air-cooled unit at the uniform solid solution temperature has a slightly higher strength than the furnace-cooled room temperature, and the impact toughness and reduction of area are much higher. The elongation does not change much, but the yield strength is slightly reduced. The high temperature strength shows a slight improvement trend with the improvement of the cooling rate, and the plastic index changes not significantly. The solid solution temperature is 30-40℃ below the phase transition point, and the heat preservation is 2h air cooling +550℃, 6h air cooling heat treatment system, which can ensure the best combination of plasticity and strength of the alloy.

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