Process for preparing semisolid steel blank by using radial forging strain induction method

Abstract

The invention discloses a process for preparing a semisolid steel blank by using a radial forging strain induction method. The process comprises the following steps: firstly, preheating a steel rod material, performing radial forging on the steel rod material, performing secondary remelting on the blank after radial forging, and finally preparing the semisolid steel blank. By adopting the process, semisolid steel blanks which are uniform in tissue and small in micro defect can be prepared in batch, and the process is simple in procedure and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of semi-solid processing and forming, and in particular relates to a process for preparing steel semi-solid blanks by a radial forging strain induction method. Background technique [0002] In the 1970s, Professor Flemings of the Massachusetts Institute of Technology proposed metal semi-solid processing and forming technology. Semi-solid processing and forming technology is a process in which semi-solid billets whose microstructure is spherical grains suspended in the eutectic liquid phase are used for forming. This method is a forming method between casting (pure liquid state) and forging (pure solid state). Spherical or nearly spherical semi-solid slurries have obvious thixotropic properties: that is, as the shear rate increases, the apparent viscosity decreases exponentially, making the slurries have the characteristics of good fluidity and low forming force during the forming process. And during the fi...

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Problems solved by technology

Other methods of preparing semi-solid blanks from liquid metals also mainly focus on changing the thermal state of the metal during the solidification process, or adding grain refiners, or performing rapid solidification, etc., that is, changing the nucleation and growth of the primary solid phase. Large process, the solid-liquid mixed slurry of spherical primary solid phase distributed in the eutectic liquid phase is obtained. However, the process of preparing aluminum alloy semi-solid slurry by conventional mechanical stirring method and electromagnetic stirring method has the following disadvantages: The mechanical agitator has a severe corrosion effect, and the corrosion residue is mixed with the semi-solid slurry, resulting in the impurity of the obtained slurry

The above-mentioned methods all have limitations on the volume of the deformed material. If the volume of the deformed material is too large, the deforming force will be too large, and it is difficult to prepare the required semi-solid blanks in batches on existing equipment.

Moreover, the above-mentioned methods so far mainly focus on the preparation of semi-solid blanks of low-melting-point alloys such as aluminum alloys and magnesium alloys, and do not involve the preparation of semi-solid blanks of high-melting-point ferrous metals such as iron and steel.

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