TC6 titanium alloy plate is a martensitic Ti-Al-Mo-Cr-Fe-Si α+β two-phase heat-strength titanium alloy with good comprehensive properties. Its nominal composition is Ti-6Al-2.5Mo-1.5Cr. -0.5Fe-0.3Si, α/β transition temperature is between 960 and 1000°C.
In addition to the advantages of ordinary titanium alloys such as high specific strength and good corrosion resistance, this alloy also has good comprehensive mechanical properties at room temperature and high temperature. The operating temperature can be as high as 450°C. It is often used to manufacture important aircraft engine blades, turbine disks, etc. Components can also be used to manufacture aircraft partitions, joints and other parts.
The TC6 titanium alloy ingot used in the experiment was melted three times in a vacuum consumable electric arc furnace. Its beta transformation temperature is 975~985°C. The specific chemical composition is (wt.%): Al6.2, Mo2.5, Cr1.4 , Fe0.41, Si0.29, O0.10, Zr＜0.01, C＜0.01, N＜0.01, Ti balance. The TC6 ingot used in the experiment was opened in the β phase region and forged into a slab in the α+β two-phase region. The slab is hot-rolled above the β transformation temperature and rolled to 3.5mm in the α+β two-phase zone. After intermediate annealing and pickling, cold rolling work hardening experiments are carried out. When the processing rate increases by 5%, cut a 200mm long piece of test material from the head of the plate, and continue rolling the remaining plate. Repeat rolling and sampling until edge cracks or surface cracks appear on the plate. Then, the cut 200mm experimental materials with different processing deformations were tested to test the thickness, width, edge cracks, structure and mechanical properties of the experimental plates.
