A Method for Reducing Recrystallization of Single Crystal Superalloy Precision Castings
A high-temperature alloy and precision casting technology, which is applied in the field of high-temperature alloys to achieve the effects of easy manipulation, easy realization, and increased yield
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Embodiment 1
[0023] Put the DD5 precision casting blade into the vacuum heat treatment furnace, carry out the graded recovery heat treatment and then carry out the solid solution treatment. The specific process is as follows: the temperature is raised from room temperature to 1000°C for 50 minutes, the temperature is kept at 1000°C for 2 hours, the temperature is raised from 1000°C to 1160°C for 20 minutes, the time is kept at 1160°C for 10 minutes, and the time for heating to 1260°C is 40 minutes. After holding at 1260°C for 10 minutes, Then cool down to 1160°C for 40 minutes, and then continue to keep warm at 1160°C for 10 minutes, and so on for 10 cycles. After annealing, the temperature is raised directly for solution treatment. At the same time, a group of comparative experiments were carried out, and the DD5 blades in this group were directly subjected to solution treatment without annealing. After the heat treatment, the two groups of blades were subjected to macroscopic corrosion ...
Embodiment 2
[0025] Put the DD5 single crystal blade into the vacuum heat treatment furnace, carry out graded recovery heat treatment and then carry out solid solution treatment. The specific process is as follows: the temperature is raised from room temperature to 1050°C for 50 minutes, the temperature is kept at 1050°C for 4 hours, the temperature is raised from 1050°C to 1150°C for 20 minutes, the temperature is kept at 1150°C for 20 minutes, and the temperature is raised to 1230°C for 60 minutes. After holding at 1230°C for 20 minutes, Then lower the temperature to 1150°C for 60 minutes, and then continue to keep warm at 1150°C for 20 minutes, and so on for 5 cycles. After annealing, the temperature is raised directly for solution treatment. At the same time, a group of comparative experiments were carried out. The DD5 single crystal blades in this group were directly subjected to solution treatment without annealing. After the heat treatment, the two groups of blades were subjected t...
Embodiment 3
[0027] Put the DD99 single crystal blade into the vacuum heat treatment furnace, carry out graded recovery heat treatment and then carry out solid solution treatment. The specific process is as follows: from room temperature to 980°C for 50 minutes, 980°C for 8 hours, 980°C to 1120°C for 20 minutes, 1120°C for 100 minutes, then heating to 1220°C for 30 minutes, 1220°C for 100 minutes, Then cool down to 1120°C for 30 minutes, and then continue to keep warm at 1120°C for 100 minutes, and so on for 4 cycles. After annealing, the temperature is raised directly for solution treatment. At the same time, a group of comparative experiments were carried out, and the DD99 blades in this group were directly subjected to solid solution treatment without annealing. After heat treatment, the two groups of blades were subjected to macroscopic corrosion to observe the recrystallization situation. Among them, no recrystallization grains were observed in 100% of the blades in the group of grad...
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