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Method for evaluating casting process performance of single crystal superalloy
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A technology of superalloy and casting process, which is applied in the field of evaluation of casting process performance of single crystal superalloy, and can solve problems such as miscellaneous crystals, small-angle grain boundaries, freckles, etc.
Inactive Publication Date: 2021-04-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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In order to meet the requirements of increasing temperature bearing capacity, high-generation single crystal superalloys have been developed. Therefore, in order to meet the requirements of increasing service temperature, the content of refractory elements is getting higher and higher. At the same time, in order to continuously improve cooling As a result, the blade structure is becoming more and more sophisticated, which makes it easy to have defects such as miscellaneous crystals, small-angle grain boundaries, and freckles during the preparation of single crystal blades.
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Embodiment 1
[0027] In this example, a DD33 single crystal superalloy disk sample was prepared by directional solidification process, and the casting process performance of the alloy was evaluated, as follows:
[0028] (1) The alloy disk sample to be prepared includes an upper disk area and a lower cone area, wherein: the diameter of the disk area D=100mm, the thickness h=10mm, and the angle α of the transition section (cone area)=120° ,Such as Figure 1-2 .
[0030] Prepare a wax mold according to the structure and size of the disk sample to be prepared. The wax mold includes a crystal starting section, a transition section, a disk, a runner, a gating system, and a sprue cup.
[0031] (3) Shell making:
[0032] The wax type is first coated with 1-2 layers of slurry for the hanging surface layer, the viscosity is controlled at 35-40s, and the sanding is EC95 sand; then 3-6 layers of the reinforcement layer slurry are applied, the viscosity is controll...
Embodiment 2
[0042] In this example, a disc sample of PWA1484 single crystal superalloy was prepared by directional solidification process, and the casting process performance of the alloy was evaluated, as follows:
[0043] (1) The alloy disk sample to be prepared includes an upper disk area and a lower cone area, wherein: the diameter of the disk area D=100mm, the thickness h=10mm, and the angle α of the transition section (cone area)=120° ,Such as Figure 1-2 .
[0044] (2) Prepare the wax model:
[0045] Prepare a wax mold according to the structure and size of the disk sample to be prepared. The wax mold includes a crystal starting section, a transition section, a disk, a runner, a gating system, and a sprue cup.
[0046] (3) Shell making:
[0047] The wax type is first coated with 1-2 layers of slurry for the hanging surface layer, the viscosity is controlled at 35-40s, and the sanding is EC95 sand; then 3-6 layers of the reinforcement layer slurry are applied, the viscosity is co...
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technical field [0001] The invention belongs to the technical field of single-crystal high-temperature alloys, and in particular relates to a method for evaluating the casting process performance of single-crystal high-temperature alloys. Background technique [0002] With the continuous improvement of the efficiency of engines and gas turbines, single crystal superalloys are widely used. In order to meet the requirements of increasing temperature bearing capacity, high-generation single crystal superalloys have been developed. Therefore, in order to meet the requirements of increasing service temperature, the content of refractory elements is getting higher and higher. At the same time, in order to continuously improve cooling As a result, the structure of the blade is becoming more and more sophisticated, which makes it easy to have defects such as miscellaneous crystals, small-angle grain boundaries, and freckles during the preparation of single-crystal blades. [0003] ...
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