Method for controlling metal solidification phase texture in combined mode through external rotating magnetic field and current and fusion casting device of method

Abstract

The invention discloses a method for controlling metal solidification phase texture in a combined mode through an external rotating magnetic field and current and a fusion casting device of the method. In a metal solidification process, firstly, the rotating magnetic field is exerted on a metal melt area on the front edge of a metal melt solidification interface, and meanwhile the current is exerted on metal melt nearby a solid-liquid interface area of a whole continuously cast bloom through an external power supply. Under the combined action of the rotating magnetic field and the current, electromagnetic combined stirring is conducted on metal liquid nearby the metal melt solidification interface, so that collision, friction and scour occur among primary grains of the metal melt and between the primary grains and the metal melt, fragmentation of the primary grains can be caused, and therefore the solidification texture of the continuously cast bloom is refined. The method is used for preparing high-quality metal materials.

Description

technical field [0001] The invention relates to a metal material preparation process and equipment, in particular to a metal material preparation process and special equipment by applying electromagnetic stirring, which is applied in the technical field of metal material solidification. Background technique [0002] Automobile is one of the most important means of transportation in today's society, and it is also one of the pillar industries of our country. Therefore, the research and development of high-performance automotive materials has become an important topic for the development of my country's automotive industry. In particular, the materials of key components, such as engine cylinder liners and pistons, were usually made of ferroalloys such as cast iron and sintered steel in the past, which increased the weight of the vehicle, increased fuel consumption, high driving resistance, low engine efficiency, and brought pollution, Environmental issues such as noise. Ther...

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Problems solved by technology

Using spray molding technology, high-silicon aluminum alloys with a silicon content of 50% can be prepared, and the particle size of primary silicon can be refined to 5-10um, but the cost of spray molding technology is very high, forming is difficult, and its compactness is also low. Therefore, the high-silicon aluminum alloy products prepared by spray molding are not yet competitive in the market; there are many methods of adding modifiers, which are widely used in industry at present, but the modifiers can only refine Si content less than 30% Al-Si alloy, and the refinement size is limited. Generally, the size of primary silicon particles can only be refined to 30-50um, while the optimal size of primary silicon for high-silicon aluminum alloys is 5-20um; The semi-solid stirring method is difficult to achieve uniform stirring of the entire ingot, so that the refinement effect of the ingot in each area is quite different, and there is segregation; the method of rapid solidification can also obtain the primary silicon structure with very fine grains , but its biggest problem is that the increase of cooling rate must be at the expense of the size of the sample, and at the same time the cost of industrial application is high; A unified theoretical system has not yet been established

It can be seen that there is still a lack of effective means to control the size and shape of the primary silicon structure and the eutectic silicon structure in the hypereutectic aluminum-silicon alloy castings, and the preparation process of high-performance high-silicon aluminum alloys has become an urgent problem to be solved. key issues

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