TC6 titanium alloy plate is a martensitic Ti-Al-Mo-Cr-Fe-Si series α+β two-phase thermally strong titanium alloy with good comprehensive properties. Its nominal composition is Ti-6Al-2.5Mo-1.5Cr -0.5Fe-0.3Si, the α/β transition temperature is between 960 and 1000 °C. In addition to the advantages of high specific strength and good corrosion resistance of ordinary titanium alloys, this alloy also has good comprehensive mechanical properties at room temperature and high temperature, and the operating temperature can be as high as 450 °C. Parts, can also be used to manufacture aircraft bulkheads, joints and other parts. In China, a lot of work has been done on the processing technology and performance optimization of TC6 titanium alloy forgings, castings, pipes and bars, etc., but there is less research on TC6 alloy sheets. The basic technological parameters of cold rolling processing of TC6 sheet were studied, and the cold rolling processing performance of TC6 sheet was studied.
The TC6 titanium alloy ingot used in the experiment is obtained by three times of smelting in a vacuum consumable electric arc furnace. , Fe0.41, Si0.29, O0.10, Zr<0.01, C<0.01, N<0.01, and the remainder of Ti. The TC6 ingot used in the experiment was opened in the β phase region, and the α+β two-phase region was forged into a slab. The slab is hot rolled and opened at the β transformation temperature, and rolled to 3.5mm in the α+β two-phase region. After intermediate annealing and pickling, the cold rolling work hardening experiment is carried out. When the processing rate increases by 5%, a piece of 200mm long test material is cut from the head of the plate, and the remaining plate continues to be rolled. Repeated rolling and sampling until the plate has edge cracks or surface cracks. Then the cut 200mm experimental materials with different processing deformations were tested, and the thickness, width, edge cracks, microstructure and mechanical properties of the experimental plates were tested respectively.
The above experimental microstructures were observed on an Axiovert 200 MAT optical microscope, and the mechanical properties were tested on an Instron5885 tensile testing machine. The test results are as follows:
(1) It can be found from the cold rolling work hardening curve that the tensile strength and yield strength increase with the increase of the working rate, while the elongation gradually decreases, which is mainly due to the increase of the dislocation density with the increase of the cold rolling working rate. , the work hardening is aggravated. When the processing rate reaches about 27%, the tensile strength and yield strength curves tend to be horizontal, indicating that it enters the difficult deformation stage.
(2) The maximum cold rolling processing rate of TC6 titanium alloy plate can reach 30.3%, and the elongation of the material is reduced to 5.8% at this time. It is observed that wrinkles and embossments appear on the surface of the plate, and cracks appear on the edge. When the cold rolling processing rate reaches 30.3%, the width is 20mm.
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