Classification, organization and properties of TC4 titanium alloy

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There are only three types of titanium alloys by organization, namely alpha, (alpha + beta) and beta. Among them, α and β type titanium alloy crystalline shape remains unchanged after heating and cooling, only in the (α + β) type titanium alloy containing a certain range of alloying elements, the heating temperature is higher than the phase transition temperature, rapid cooling β phase with martensite transformation. Due to the different heating temperatures and cooling rates, a variety of different microstructures will be obtained, and therefore have different mechanical properties. This is important, the use of titanium alloys to produce a variety of equipment, parts, such as thermal effects, must consider the issue of phase transformation in the alloy.


TC4 titanium alloy heated to 1020 degrees, the high temperature microstructure of the alloy is a single-phase β composition, a solid solution. When quenched at different cooling rates, such as quenching in water, cooling in air and cooling with the furnace, the microstructure obtained is different, quenching in water (WQ) organization for martensite α '+ β phase, cooling in air (AC) organization for the needle α + β phase and the original β grain boundary phase, cooling with the furnace (FC) organization for the strip α + β phase and the original β phase grain boundary.


As in the above case, the microstructure obtained after cooling at different cooling rates differs when heated to 950 and 850 degrees C. At 950 degrees C, the water quenching (WQ) organization is incipient equiaxed α phase and α'+β phase, the cooling in air (AC) organization is incipient equiaxed α phase and needle-like β phase, and the cooling with the furnace (FC) organization is equiaxed α phase At 850 degrees, the water quenching (WQ) organization is incipient equiaxed α-phase and sub-stable β-phase, and the cooling in air (AC) organization is incipient equiaxed α-phase and transformed β-phase.


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