Method for obtaining small fully lamellar structure by using beta type gamma-TiAl-based alloy
A base alloy and full lamella technology, which is applied in the field of β-type γ-TiAl base alloy to obtain fine full lamellar structure, can solve the problems of low alloy plasticity, and achieve the effect of high alloy plasticity, improved room temperature plasticity and uniform distribution.
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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 Phase transition temperature T 1 is 1283°C, the eutectoid point temperature T 2 The temperature is 1190°C; the ingot is prepared by 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-treat i...
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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