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Fine-grain casting method and device for complex precision or thin-walled castings controlled by magneto-thermal compound

A compound control and thin-walled casting technology, applied in the field of metal material preparation, can solve the problems of complex precision castings or thin-walled castings that are difficult to refine, and achieve the effect of widening the scope of use, low working voltage and remarkable effect

Active Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to meet the grain refinement requirements of complex precision castings or thin-walled castings, the purpose of the present invention is to provide a method and device for fine-grained casting of complex precision or thin-walled castings controlled by magneto-thermal compounding, which is based on high superheat to ensure mold filling First, control the application time of the pulsed magnetic field to refine the solidified structure of the casting, especially the structure of the thick and large parts of the casting, obtain the overall refined solidified structure, and solve the problem of difficult refinement of complex precision castings or thin-walled castings under high superheat

Method used

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  • Fine-grain casting method and device for complex precision or thin-walled castings controlled by magneto-thermal compound
  • Fine-grain casting method and device for complex precision or thin-walled castings controlled by magneto-thermal compound
  • Fine-grain casting method and device for complex precision or thin-walled castings controlled by magneto-thermal compound

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Embodiment 1

[0040] The IN718 nickel-based superalloy was melted to 1600°C in a vacuum induction melting furnace and refined for 5 minutes, then cooled to 1580°C (superheated at 220°C) and poured into a mold placed in a ring pulse magnetic field device (preheated to 950°C ), when the surface temperature of the melt drops to 1350°C (50s after pouring), the pulsed magnetic field is turned on to solidify the alloy melt under the action of the pulsed magnetic field. During the experiment, the voltage of the pulsed magnetic field was 250V, the frequency was 5Hz, and the action time was 15 minutes.

[0041] image 3 It is a comparison of the metallographic structure of the cross section of the present invention and the common cast IN718 superalloy Φ100mm ingot. It can be seen that by adopting the process of the present invention, the solidification structure of the thick ingot is refined as a whole, the grain size distribution of the entire cross-section is uniform, and the core grain is less t...

Embodiment 2

[0043] The K4169 superalloy was melted to 1580°C in an induction melting furnace and refined for 5 minutes, then cooled to 1550°C (superheated at 190°C) and poured into a mold (preheated to 1050°C) placed in a single-side pulsed magnetic field device When the surface temperature of the melt drops to 1350°C (10s after pouring), the pulsed magnetic field is turned on to solidify the alloy melt under the action of the pulsed magnetic field. During the experiment, the voltage of the pulsed magnetic field was 300V, the frequency was 5Hz, and the action time was 20 minutes.

[0044] Figure 4 It is a comparison of alloy microstructure after solidification of large thin-walled castings of the present invention and ordinary cast K4169 superalloy. The outer diameter of the casting is 330mm, the thin wall is 2mm, and the thick part is 20mm. It can be seen that by adopting the process of the present invention, the grain refinement effect of the thick and large parts of the casting is o...

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Abstract

The invention relates to a magnetism-heat composite control complex precision or thin wall casting fine grain casting method and device and belongs to the technical field of metal material preparing. According to the method, on the basis that the high superheat degree is used for guaranteeing mould filling, the applying time of a pulsed magnetic field is controlled, when a crystal nucleus at a mould wall grows to 1-10 microns, the crystal nucleus at the mould wall is scoured down and taken into a melt body through electromagnetic oscillation and forced convection generated at the metal melt body by the applied pulsed magnetic field, at the time, the size of the falling crystal nucleus is large, the crystal nucleus can easily survive and become an effective nucleation nucleus, the nucleation rate is improved, and accordingly a casting solidification structure is refined. The device comprises a pulsed magnetic field generating device, a pulsed magnetic field effect device and a temperature control system. The method and device can be used for fine grain casting of metal material complex precision castings such as high temperature alloy and high alloy steel and large thin wall complex castings, and the metal solidification structure can be refined.

Description

technical field [0001] The invention relates to a fine-grain casting method and device for complex precision or thin-walled castings controlled by magneto-thermal compounding, and belongs to the technical field of metal material preparation. Background technique [0002] The solidification structure control of metal materials is a key to realize the refinement and homogenization of metal materials. It is regarded as an important means to improve its mechanical properties and processing properties. It has always been the goal pursued by the metal material preparation process and one of the important research topics. one. Among the many methods of controlling the solidification process, electromagnetic control of solidification has received great attention. By changing the type, mode, intensity, time and other parameters of electromagnetic field action, combined with controlling the cooling process of solidification, the solidification process is controlled. Electromagnetic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/08
CPCB22D27/02B22D27/08
Inventor 杨院生李应举罗天骄冯小辉滕跃飞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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