Method for obtaining fine and fully lamellar structure of β-type γ-tial-based alloy
A base alloy and full-lamellar technology, which is applied in the field of obtaining fine full-lamellar structures in β-type γ-TiAl-based alloys, can solve the problem of low alloy plasticity, achieve high alloy plasticity, uniform distribution, and improve alloy performance.
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Embodiment 1
[0029] The chemical composition of the β-type γ-TiAl-based alloy used in this embodiment is calculated according to atomic percentage: Al 45%, Ta 3.0%, W 0.2%, Cr 2%, and the balance is Ti, and the β-type γ-TiAl-based alloy is Phase transition temperature T 1 is 1283°C, the eutectoid point temperature T 2 The temperature is 1190°C; the ingot is smelted by the vacuum self-consumption three-time melting process, and then the ingot is extruded to obtain the processed β-type γ-TiAl-based alloy rod, along the 1 / 2 radius of the cross-section of the rod Cut out a sample of 8mm×8mm×8mm, and process the sample as follows:
[0030] Step 1. Place the β-type γ-TiAl-based alloy sample in a heat treatment furnace, heat-preserve it at 1288°C for 20 minutes, cool the furnace to 1070°C, take out the alloy sample and air-cool it to room temperature;
[0031] Step 2. Place the β-type γ-TiAl-based alloy sample that was air-cooled to room temperature in step 1 in a heat treatment furnace, heat-t...
Embodiment 2
[0040] Adopt the β-type γ-TiAl based alloy bar of the processing state identical with embodiment 1, cut out the sample of 10mm * 10mm * 10mm along the 1 / 2 radius place of bar cross section, this sample is carried out as follows:
[0041] Step 1. Place the β-type γ-TiAl-based alloy sample in a heat treatment furnace, heat-preserve it at 1283°C for 30 minutes, cool the furnace to 1030°C, take out the alloy sample and air-cool it to room temperature;
[0042] Step 2. Place the β-type γ-TiAl-based alloy sample that was air-cooled to room temperature in step 1 in a heat treatment furnace, heat-treat it at 1190°C for 20 minutes, and take it out and air-cool it to room temperature;
[0043] Step 3. According to the method of step 2, repeat the heat preservation heat treatment and air cooling of the β-type γ-TiAl-based alloy sample that was air-cooled to room temperature in step 2 for 3 times, and then place it in a heat treatment furnace for heat preservation and heat treatment at 128...
Embodiment 3
[0048] Adopt the β-type γ-TiAl based alloy bar of the processing state identical with embodiment 1, cut out the sample of 15mm * 15mm * 15mm along the 1 / 2 radius place of bar cross section, this sample is carried out as follows:
[0049] Step 1. Place the β-type γ-TiAl-based alloy sample in a heat treatment furnace, heat-preserve it at 1278°C for 30 minutes, cool the furnace to 1030°C, take out the alloy sample and air-cool it to room temperature;
[0050] Step 2. Place the β-type γ-TiAl-based alloy sample that was air-cooled to room temperature in step 1 in a heat treatment furnace, heat-treat it at 1185°C for 20 minutes, and take it out and air-cool it to room temperature;
[0051] Step 3. According to the method of step 2, repeat heat preservation and heat treatment and air cooling of the β-type γ-TiAl-based alloy sample in step 2 to room temperature for 3 times, and then place it in a heat treatment furnace for heat preservation and heat treatment at 1283°C for 10 minutes ...
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