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A refiner, press molding technology, applied in the field of precision casting, can solve the problem of quality decline of castings, achieve the effect of improving quality and performance, and strong operability
Active Publication Date: 2021-02-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0003] The purpose of the present invention is to provide a preparation method and application of a refiner, which is suitable for the...
Method used
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Embodiment 1
[0024] In the present embodiment, the preparation method of the refiner is as follows:
[0025] Take Ni, Al, WC, Co and other powders, the mass percentages are 30%, 10%, 9% respectively, Co is the balance; the particle size is Ni (200 mesh), Al (320 mesh), WC (100 mesh), Co (80 mesh), mixed into powder; adopt cold isostatic pressing technology at room temperature and pressure 32MPa; use alcohol to ultrasonically clean the refiner, and dry at 100°C.
[0026] Casting I-shaped sample, the alloy grade is In-792, adding refiner, the temperature of the alloy liquid is 1750 °C, the pouring time is 100 seconds, the heat preservation is 1 minute, and the addition amount is 0.02% of the weight of the alloy liquid; at the same time, pouring Blow argon in the room for 30 seconds, and stir with a corundum rod for 1 minute, and observe the grain size of the sample after cooling. figure 1 and figure 2 is the surface grain size and section grain size of the sample without adding refiner; ...
Embodiment 2
[0028] In the present embodiment, the preparation method of the refiner is as follows:
[0029] Take Ni, Al, WC, Co and other powders, the mass percentages are 50%, 30%, 8% respectively, Co is the balance; the particle size is Ni (320 mesh), Al (200 mesh), WC (80 mesh), Co (100 mesh) is mixed and mixed into powder; cold isostatic pressing technology is used to press at room temperature and pressure 38MPa; the refiner is ultrasonically cleaned with alcohol and dried at 60°C.
[0030] Pouring I-shaped sample, its alloy grade is K418b, adding refiner, at this time, the temperature of the alloy liquid is 1550°C, the pouring time is 60 seconds, the heat preservation is 2 minutes, and the addition amount is 0.09% of the weight of the alloy liquid; at the same time, pouring Blow argon in the room for 65 seconds, and stir with a corundum rod for 1 minute, and observe the grain size after cooling. Figure 5 It can be seen that the crystal grains are also obviously refined.
[0031] T...
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Abstract
The invention relates to the technical field of precision casting, in particular to a preparation method and application of a refiner. Ni powder, Al powder, WC powder, Co powder and the like are selected according to certain mass percent and particle size requirements and are mixed into powder. Compression molding is conducted by adopting a cold isostatic pressing technology under the conditions of the room temperature and pressure of 10 MPa-60 MPa; ultrasonic cleaning is conducted on the refiner by using alcohol, and drying is conducted at the temperature of 50 DEG C-100 DEG C; and finally, in the pouring process, the refiner is added, meanwhile, it is guaranteed that the temperature of alloy liquid ranges from 1500 DEG C to 1750 DEG C, the pouring time ranges from 10 seconds to 120 seconds, the heat preservation time ranges from 1 minute to 3 minutes, the adding amount ranges from 0.01 wt% to 0.5 wt%, argon is blown into a pouring chamber, stirring is conducted through a corundum rod, and the grain size of a sample is observed after cooling. The method is suitable for the casting process of all metal materials, can practically and effectively solve the problem of casting qualityreduction caused by coarse high-temperature alloy grains, is simple to operate and low in cost, and has higher economic benefits and long-term application prospects.
Description
technical field [0001] The invention relates to the technical field of precision casting, in particular to a preparation method and application of a refiner. Background technique [0002] Ordinary polycrystalline cast superalloys are still widely used in modern aerospace engines and industrial gas turbines, especially cast superalloys working under medium and low temperature conditions are basically polycrystalline. The polycrystalline superalloy castings produced under ordinary investment casting conditions are relatively coarse dendrites or columnar crystals, which lead to a decrease in the mechanical properties of the castings and affect the working efficiency of key components such as engines and gas turbines. Contents of the invention [0003] The object of the present invention is to provide a preparation method and application of a refiner, which is applicable to the casting process of all metal materials, and can effectively solve the problem of casting quality deg...
Claims
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