Ultrasonic mold casting method for alloy steel

Abstract

The invention provides an ultrasonic melt treatment method for cast alloy steel and belongs to the technical field of metal melt treatments. The ultrasonic melt treatment method comprises the specific steps that the alloy steel is poured into a casting mold (6) prepared in advance after being heated to be melted, argon is led for protection, and heat preservation is conducted for a period; then an ultrasonic generator is mounted on a bracket (2), and the height of the bracket (2) is adjusted to enable a high temperature resistant ceramic tool head (5) to be immersed into the center of high temperature steel melt (7) in the mold (6); an ultrasonic power supply (1) is turned on, ultrasonic waves are formed through high frequency vibration generated by an ultrasonic transducer (3) and transmitted into the high temperature steel melt (7) through a T-shaped amplitude rod (4) and the high temperature resistant ceramic tool head (5) to conduct ultrasonic treatment on the melted alloy steel, and therefore an ultrasonic mold-cast steel ingot is obtained. By adoption of the ultrasonic melt treatment method, the grain structure of the steel ingot can be obviously refined, and the casting defects of the steel ingot are overcome.

Description

technical field [0001] The invention relates to the fields of ultrasonic waves and metal solidification, in particular providing an ultrasonic die-casting method for alloy steel. Background technique [0002] As early as the 1930s, some scholars studied the influence of ultrasonic vibration on the solidification process of metals and organic matter. In recent years, with the development of ultrasonic technology, ultrasonic treatment has gradually been applied in the process of metal solidification and forming as a new technology to improve material properties. Many studies have found that a series of linear and nonlinear effects of ultrasonic waves in the melt can refine the grain structure, reduce porosity, degassing, etc., thereby enhancing the mechanical properties of the material. [0003] However, most of the research on ultrasonic metal melt processing technology is concentrated in the field of solidification and forming of medium and low temperature alloys such as al...

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Problems solved by technology

[0003] However, most of the research on ultrasonic metal melt processing technology is concentrated in the field of solidification and forming of medium and low temperature alloys such as aluminum and aluminum alloys, magnesium and magnesium alloys, and is rarely used in high temperature alloy steels. Applied to processing small steel samples, there is still a long way to go before industrial application

The main reason for this is that if the ultrasonic wave is to be introduced into the high-temperature melt, the probe of the ultrasonic waveguide device must be in direct contact with the high-temperature melt, and the ultrasonic probe is easily eroded in the high-temperature melt. The advanced titanium alloy probe can basically meet the application of ultrasonic waves in the solidification and forming process of medium and low temperature alloy melts such as aluminum alloys and magnesium alloys, but its service life still cannot achieve the long-term effect of ultrasonic waves, let alone at temperatures as low as aluminum alloys. Alloy melt twice as much molten steel

Ceramic materials are currently commonly used high-temperature resistant materials. The submerged pouring nozzles used in continuous steel casting are made of high-temperature resistant ceramic materials. The erosion effect of the probe, but the probe needs to transmit ultrasonic waves while contacting high-temperature molten steel. Traditional high-temperature-resistant ceramics are generally sintered from large-grained powder. The material is relatively loose and there are a lot of gaps. Vibration can easily damage the ceramic material, resulting in the cracking of the ceramic probe, and it is impossible to introduce ultrasonic waves into the high-temperature steel melt

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