Method for efficiently preparing large-volume semi-solid thick liquid through compounding process

Abstract

The invention relates to a method for efficiently preparing a large-volume semi-solid thick liquid through a compounding process. The method comprises the following steps that a large-volume alloy melt in a container is stirred, meanwhile, in order to enable the alloy melt of the edge part to be sufficiently stirred to avoid adhering materials and quickly cooling the melt, the melt disturbance andthe particles of the same alloy composition are added in the alloy melt on the outer wall of the container, so that the purpose of rapidly and uniformly melting a component field and a temperature field and rapidly cooling is achieved. According to the compounding process, when the melt falls to a preset semi-solid temperature, the treating is stopped, the large-volume semi-solid thick liquid with a solid phase rate of 20%-60% is obtained, and the thick liquid is sent to a forming device for rheoforming. The method solves the problem that when the large-volume semi-solid thick liquid is prepared by a single process, the structure is not uniform, the edge of a crucible is adhered due to insufficiently stirring or disturbing, and the cooling of the melt is slow; and the process is strong incontrollability and good in industrialization prospect, and is particularly suitable for preparing the large-volume semi-solid thick liquid with the weight of more than 10 kg.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid processing, and in particular relates to a method for efficiently preparing large-volume semi-solid slurry with a mass of more than 10 kg through a composite process. Background technique [0002] In the 1970s, Professor M.C.Flemings of the Massachusetts Institute of Technology and others invented metal semi-solid processing technology. The preparation of semi-solid slurry is the core and key of semi-solid processing technology. There are various methods for preparing metal semi-solid slurry, such as double helix stirring method, bubble stirring method, serpentine sprue method, low superheat casting and weak mechanical stirring method, electromagnetic stirring method, turbulent flow effect method, ultrasonic treatment method, forced convection stirring method, spray deposition method, cooling chute method, rotating enthalpy balance method, etc. However, the above method has the problems ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of instability, low efficiency, unsuitability for the preparation of large-volume semi-solid slurry and difficulty in industrialization of the existing pulping process, and provides a composite process for efficiently preparing large-volume semi-solid slurry, that is, in During the solidification process of the alloy melt, while directly stirring the alloy melt in the container and indirect treatment of the melt near the crucible wall to cause disturbance, a certain amount of alloy particles is quickly scattered into the interior of the alloy melt; Under the synergistic effect of the stirring device, the melt disturbance device and the melting and heat absorption of alloy particles, the alloy melt cools down rapidly and nucleates a large number of nuclei inside it, and dissociates inside the melt under the convection generated by stirring and disturbance. The synergistic effect makes the internal temperature field and composition field of the alloy uniform, and inhibits the growth of grain dendrites, thereby preparing a large-volume semi-solid slurry with a certain volume fraction of spherical or near-spherical primary solid phases uniformly distributed in the liquid phase matrix

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