A kind of preparation method of tc4 fine-grained titanium alloy sheet
A titanium alloy and sheet technology, applied in the field of preparation of TC4 fine-grained titanium alloy sheet, can solve the problems of long preparation process, high production cost, fine grain of TC4 titanium alloy sheet, etc. Production cost controllable effect
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Embodiment 1
[0038] 1) Prepare two hot-rolled slabs with a thickness of 3 mm;
[0039] 2) Heat the slab to 1010°C and keep it warm for 40mim, then water-cool it to below 600°C and then cool it naturally to room temperature;
[0040] 3) Coating the slab after special heat treatment, coating carbon powder on the upper and lower surfaces of the titanium alloy slab during coating, and controlling the thickness of the coating at 1-2 μm;
[0041] 4) Carry out the first pass of reverse rolling at low temperature, that is, the billet is reversed before the rolling mill and then bitten into the rolling mill to achieve lateral deformation in the width direction, and then reversed in the 2nd to 4th passes to Longitudinal rolling deformation is carried out in the original length direction; the rolling temperature is 750°C, 4 passes, and the final rolling thickness is 0.3mm; the deformation amount of each pass is required to be 18-25%, and the total deformation amount is required to be 80%;
[0042] 5...
Embodiment 2
[0046] 1) Prepare two hot-rolled slabs with a thickness of 8mm;
[0047] 2) Heat the slab to 1020°C and keep it warm for 40mim, then air cool it to below 600°C and then cool it naturally to room temperature;
[0048] 3) Coating the slab after special heat treatment, coating carbon powder on the upper and lower surfaces of the titanium alloy during coating, and controlling the thickness of the coating at 1-2 μm;
[0049] 4) Perform low-temperature multi-pass reversing rolling on the coated stacked ladle, which requires a large deformation along the original length direction in the first pass, and a reversing rolling mode in the subsequent passes along the width direction. The rolling temperature is 850℃, 3 passes, the final rolling thickness is 1.2mm; the deformation requirement for each pass is 20-35%, and the total deformation requirement is 80-90%;
[0050] 5) heat-treating the rolled plate obtained in step 4), the treatment temperature is 910°C, and the holding time is 40m...
Embodiment 3
[0054] 1) Prepare two hot-rolled slabs with a thickness of 15 mm;
[0055] 2) Heat the slab to 1020°C and keep it warm for 40mim, then water-cool it to below 600°C and freely cool to room temperature;
[0056] 3) Coating the slab after special heat treatment, coating carbon powder on the upper and lower surfaces of the titanium alloy during coating, and controlling the thickness of the coating at 1-2 μm;
[0057] 4) The coated plate is subjected to multi-pass rolling in the first pass and the fourth pass at low temperature, and it is required that the first and fourth biting passes of the billet before the billet are rolled are deformed along the width direction, The other passes adopt the rolling mode along the original length direction, the rolling temperature is 900°C, 5 passes, and the final rolling thickness is 3mm; the deformation amount of each pass is required to be 15-30%, and the total deformation amount is required to be 75-80% %;
[0058] 5) heat-treating the rol...
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