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A preparation method of integral fine-grain radial impeller casting

An impeller and casting technology, which is applied in the field of the preparation of alloy integral fine-grained radial impeller castings, can solve the problem of easy to produce casting cracks, easy to produce under-casting of the thin-walled structure of the centripetal impeller tip, and difficult overall fine-grained casting technology, etc. problems, to achieve the effect of refining grains, reducing component segregation and porosity, and easy forming

Active Publication Date: 2016-01-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a fine-grain casting process under the action of a magnetic field to prepare a method for the integral fine-grain radial impeller casting, to solve the problem that the thin-walled structure of the radial impeller tip is easy to produce Under-casting, the overall fine-grain casting technology is difficult, and problems such as casting cracks are prone to occur in the mechanical vibration method and the mold rotation method

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  • A preparation method of integral fine-grain radial impeller casting
  • A preparation method of integral fine-grain radial impeller casting
  • A preparation method of integral fine-grain radial impeller casting

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preparation example Construction

[0032] The preparation method of the alloy integral fine grain centripetal impeller of the present invention, the method comprises the following steps:

[0033] (1) Alloy smelting: According to the chemical composition and proportion of the alloy, the master alloy ingot is melted and cast into a master alloy ingot by a vacuum induction furnace, and then the master alloy ingot is melted by a vacuum induction fine-grain casting furnace, and refined at 1450-1550°C for 3- 7 minutes, then cool down to the casting temperature, and the vacuum in the furnace is 0.1-5Pa;

[0034] (2) Casting process: the alloy treated in step (1) is cast to obtain a casting of an integral radial impeller, and the casting temperature is 1380-1450°C;

[0035] (3) Refining process: The grain size control process of the overall fine-grained radial impeller casting is to place the centrifugal impeller in step (2) in a bidirectional rotating electromagnetic field, and after standing for 8 to 30 seconds, appl...

Embodiment 1

[0046] The master alloy is smelted in a vacuum induction fine-grain casting furnace, and the whole fine-grain radial impeller is cast. The refining temperature is 1550°C, the refining time is 3 minutes, the vacuum degree is 0.1Pa, and the pouring temperature is 1450°C.

[0047] The whole fine-grained centripetal impeller after casting is placed in a two-way alternately rotating magnetic field. After standing still for 20 seconds, a 220A, 5Hz magnetic field is applied. The forward and reverse magnetic field rotation time is 30 seconds, and the reversing time is 5 seconds. After solidification, stop stirring. The alloy composition of this embodiment is shown in Table 1.

[0048] Table 1 Composition of the overall fine-grain phase-centric impeller (wt%)

[0049]

[0050] Figure 1(a) - Figure 1(b) It is the grain size of the integral fine-grained radial impeller cast in this embodiment. It can be seen that after the bidirectional rotating electromagnetic field is applied, t...

Embodiment 2

[0063] The difference from Example 1 is that the composition of the alloy for the casting of the radial impeller in this example is shown in Table 3.

[0064] Table 3 Alloy composition (wt%) for radial impeller castings

[0065]

[0066] After the centripetal impeller is refined by two-way electromagnetic rotation, heat treatment is carried out. The process is as follows:

[0067] (1) The master alloy is melted in a vacuum induction fine-grain casting furnace, and the overall fine-grain radial impeller is cast. The refining temperature is 1520°C, the refining time is 3 minutes, the vacuum degree is 0.1Pa, and the pouring temperature is 1420°C.

[0068] (2) After casting, the overall fine-grained centripetal impeller is placed in a two-way alternately rotating magnetic field. After standing for 10 seconds, a 300A, 12Hz magnetic field is applied. The forward and reverse magnetic field rotation time is 20 seconds, and the reversing time is 2 seconds. After the casting is com...

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Abstract

The invention relates to the field of centripetal impeller castings, in particular to a manufacturing method of a one-piece fine-grain centripetal impeller casting. A rotation magnetic field is applied in the solidification process of the casting, and the electromagnetic field can penetrate through molten metal to generate relative motion with the molten metal so as to enable the magnetic flux in the molten metal to be changed. Equivalently, the magnetic field cuts the molten metal at certain speed to enable induction currents to be generated inside the molten liquid. The induction currents act mutually with a magnetic field generated by an inductor to generate electromagnetic force, and the electromagnetic force acts on each volume element of the molten liquid so as to drive the molten liquid to rotate. In the cooling solidification process of the casting, the bidirectional rotation electromagnetic field is applied, so that alloy microstructures are effectively homogenized and crystalline grains are refined, and therefore the overall grain size of the centripetal impeller casting is even and uniform; meanwhile, the metallurgical defects of segregation and looseness of compositions in the alloy casting can be reduced, the problem that casting cracks are prone to being generated in a mechanical vibration method and a mold rotation method is solved, and the overall grain size of the centripetal impeller casting can be effectively improved.

Description

technical field [0001] The invention relates to the field of centripetal impeller castings, in particular to a method for preparing alloy integral fine-grained centripetal impeller castings, which can effectively improve the overall grain size of the centripetal impeller castings. Background technique [0002] Centripetal impeller castings are mainly used in engines or their auxiliary power units, and usually bear large centrifugal force and aerodynamic force in the working environment, which requires high performance and quality of castings, and generally has large size, complex structure, and different wall thickness. Uniformity and other characteristics. The medium-temperature durable strength and fatigue resistance of impeller castings can be effectively improved through grain refinement technology, but defects such as uneven grain distribution, cracks, and shrinkage cavities are prone to occur during overall fine-grain casting; centripetal impeller tip It is a thin-wal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02C22C33/06C22C38/14C21D9/32
Inventor 韦华张洪宇郑启吴多利金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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