Semi-solid thixotropic die casting forming method of narrow solid-liquid two-phase region alloy

By combining melting and casting, extrusion deformation, recrystallization heat treatment, solid-liquid two-phase heat treatment, and die casting, the problem of preparing semi-solid billets of alloys with narrow solid-liquid two-phase regions was solved, realizing the preparation of high-quality billets and efficient forming, reducing costs, and improving the mechanical properties and forming accuracy of metallic materials.

CN116475374BActive Publication Date: 2026-06-26JIANGSU LONGCHENG PREC FORGING CO LTD +1
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Patent Information

Application Number
CN202310238571.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-14
Publication Date
2026-06-26
Estimated Expiration
2043-03-14

AI Technical Summary

Technical Problem

Existing technologies make it difficult to prepare high-quality semi-solid billets of alloys with narrow solid-liquid two-phase regions, and traditional equipment is costly and suffers from problems such as gas entrapment, slag inclusion, shrinkage porosity, and cold shuts.

Method used

A method combining melting and casting, extrusion deformation, recrystallization heat treatment, solid-liquid two-phase heat treatment, and die casting is adopted. Through two isothermal heat treatments and cold extrusion, a narrow solid-liquid two-phase alloy semi-solid billet is prepared to obtain a high-density dislocation and lattice distortion structure, ensuring that the recrystallized grains are fine and uniform.

Benefits of technology

It improves the utilization rate and yield of metal materials, significantly enhances the mechanical properties and forming accuracy of semi-solid billets, reduces processing costs, simplifies the operation process, and is suitable for mass production.

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Abstract

The application discloses a semi-solid thixotropic die casting forming method of a narrow solid-liquid two-phase zone alloy, and comprises the following steps: step one: the narrow solid-liquid two-phase zone alloy is added into a heating device and heated to a superheating temperature, and after complete melting, the alloy is cooled for a certain time to obtain an alloy blank with a cast structure; step two: the alloy blank is added into an extrusion device to complete cold extrusion, and an alloy blank containing high-density dislocations and lattice distortion structures is obtained; step three: the alloy blank is heated for the first time, the heating temperature is set between a recrystallization temperature and a solidus temperature of the alloy, and isothermal heat treatment is carried out to obtain fine and uniform recrystallized grains; step four: the alloy blank is heated for the second time, the temperature is set above the solidus temperature of the narrow solid-liquid two-phase zone alloy, and isothermal heat treatment is carried out to obtain a semi-solid blank; and step five: the semi-solid blank is subjected to die casting forming. The application has the advantages that excellent castings with physical properties are formed.
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