Magnesium alloy annular part and preparation method thereof

Through the processes of double-stage uniformization treatment, multi-directional forging, punching and reaming forging, ring rolling forming and aging treatment, the defects in the preparation of large-diameter VW93M magnesium alloy ring parts are solved, and high strength and heat resistance are improved, and lightweight equipment is suitable for aerospace.

CN119710505AActive Publication Date: 2025-03-28CENT SOUTH UNIV
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Patent Information

Application Number
CN202411911991.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28
Estimated Expiration
2044-12-24

AI Technical Summary

Technical Problem

When preparing large-diameter VW93M magnesium alloy ring parts, defects such as segregation, thermal cracking and surface cold separation are present, and the plastic deformation ability of the magnesium alloy is poor, resulting in poor mechanical properties and heat resistance.

Method used

High-strength, heat-resistant magnesium alloy ring parts are prepared by using the processes of double-stage homogenization, multi-directional forging, punching and reaming forging, ring rolling forming and aging treatment. The specific steps include: double-stage homogenization treatment with low temperature first and high temperature, multi-directional forging to eliminate casting defects, improve shape through punching and reaming forging, improve wall thickness uniformity by ring rolling, and eliminate internal stress and unevenness through aging treatment.

Benefits of technology

The high strength and heat resistance of magnesium alloy ring parts have been achieved, and the room temperature mechanical properties and 250℃ mechanical properties have been significantly improved. It is suitable for lightweight equipment in the aerospace field.

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Abstract

The invention provides a magnesium alloy annular part and a preparation method thereof, and belongs to the technical field of magnesium alloy. According to the method, a two-stage homogenization treatment process of first low temperature and second high temperature is adopted, overburning of a low-melting-point phase formed in the non-equilibrium solidification process can be avoided through low-temperature treatment, dendritic segregation in the cast ingot can be fully eliminated through high-temperature treatment, and the plastic forming capacity of the cast ingot in the subsequent forging process is improved; a high forging temperature is adopted in the first fire of multi-directional forging, plastic deformation and cracking of an ingot blank can be prevented, the ingot blank is fully deformed in the multi-directional forging process, casting defects such as shrinkage cavities, air holes and looseness are reduced, the forging temperature is reduced in the second fire, grain coarsening caused by too high temperature can be prevented, a homogeneous fine-grain forging blank is obtained, and the quality of the ingot blank is improved. Therefore, the mechanical property and heat resistance of the magnesium alloy annular part are improved.
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