A kind of preparation method of ta7‑dt titanium alloy bar material for low temperature
A TA7-DT and titanium alloy technology, which is applied in the field of preparation of TA7-DT titanium alloy rods for low temperature, can solve the problems of poor comprehensive performance and coarse grains, and achieve good comprehensive mechanical properties at room temperature and low temperature, and uniform structure , The effect of horizontal tissue uniformity
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[0027] A kind of preparation method of low temperature TA7-DT titanium alloy bar material of the present invention, specifically comprises the following steps:
[0028] Step 1, melting the ingot:
[0029] According to the target value in Table 1, calculate the alloy ratio, formulate a suitable melting process, and use a vacuum consumable electric arc furnace for three vacuum melting, so that the components of the titanium alloy are fully alloyed and homogenized, and impurities and gaps are controlled. The content of the element, finally make the TA7-DT alloy ingot whose composition meets the target value of Table 1;
[0030] Table 1
[0031]
[0032] Step 2, billet forging:
[0033] For the TA7-DT titanium alloy ingot whose composition meets the target value, heat it at 140°C to 170°C above the phase transition point, and keep it warm. Heat preservation, straight drawing and rounding for 5 fires, and processed into Φ85mm~Φ100mm precision forging billets with uniform stru...
Embodiment 1
[0042] Step 1, rationally design the distribution ratio, and obtain a qualified ingot (see Table 2 for the composition) after three times of vacuum smelting, and the measured phase transition point is 1005°C;
[0043] Table 2
[0044]
[0045] Step 2: Heat the ingot to 1145°C in a box-type resistance furnace, fully keep it warm, heat it at 1005°C after 3 times of upsetting, and forge it to Φ100mm by 5 heats;
[0046] Step 3: Heating the forged billet forged in step 2 to 1005°C in a step-by-step resistance furnace, fully keeping it warm, and precision forging to Φ45mm in 1 fire, with a cumulative deformation rate of 80%;
[0047] Step 4, heating the billet forged in step 3 to 1005°C in a box-type resistance furnace, fully keeping it warm, and rolling it into a billet of Φ16.5mm in the first fire, with a cumulative deformation rate of 85%;
[0048] Step 5: heat-treat the billet at 800° C., keep it warm for 1 hour, air-cool to room temperature, straighten and surface treat, a...
Embodiment 2
[0050] Step 1, rationally design the distribution ratio, and obtain a qualified ingot (see Table 3 for the composition) after three times of vacuum smelting, with a phase transition point of 1010°C;
[0051] table 3
[0052]
[0053] Step 2, heat the ingot to 1180°C in a box-type resistance furnace, keep it warm enough, after 3 times of upsetting, heat it at 1030°C, and forge it to Φ85mm by 5 heats;
[0054] Step 3: Heat the forged billet forged in step 2 at 1020°C in a stepping resistance furnace, keep it fully warm, and finish forging to Φ45mm in 1 fire, with a cumulative deformation rate of 72%;
[0055] Step 4, heating the billet forged in step 3 at 980°C in a box-type resistance furnace, fully keeping it warm, and rolling it into a billet of Φ11.5mm in the first fire, with a cumulative deformation rate of 93%;
[0056] Step 5: heat-treat the billet at 815° C., keep it warm for 1 hour, air-cool to room temperature, straighten and surface treat, and obtain a TA7-DT tita...
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