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A Forming Method for Improving the Microstructure and Properties of Rare Earth Magnesium Alloy Conical Cylindrical Parts

A technology of microstructure and properties, rare earth magnesium, applied in metal extrusion dies, metal processing equipment, forging/pressing/hammering machinery, etc. The use of warhead cones and other issues can improve mechanical properties, reduce heating times, and ensure high performance and high density.

Active Publication Date: 2020-05-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main means of improving the microstructure and properties of rare earth deformed magnesium alloys is to refine the microstructure by increasing the degree of deformation. For the conical structural parts of warheads, due to the relatively large major axis, small end size and large conical depth, The deformation of the small end surface is small, resulting in poor performance of the small end surface, which affects the use of the bullet cone
For conical cylindrical parts, the general process method is through ingot modification and multiple reverse extrusion forming processes. Due to the large size of the conical part and the poor heating capacity of the rare earth magnesium alloy, it needs multiple heating deformations, and repeated heating is easy. Causes microstructure grain size to grow

Method used

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  • A Forming Method for Improving the Microstructure and Properties of Rare Earth Magnesium Alloy Conical Cylindrical Parts
  • A Forming Method for Improving the Microstructure and Properties of Rare Earth Magnesium Alloy Conical Cylindrical Parts
  • A Forming Method for Improving the Microstructure and Properties of Rare Earth Magnesium Alloy Conical Cylindrical Parts

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Effect test

Embodiment 1

[0054] A forming method for improving the structure and performance of a rare earth magnesium alloy tapered cylindrical part, the forming method includes:

[0055] (1) Homogenize the Mg-9Gd-3RE rare earth magnesium alloy ingot, the homogenization temperature is 500 ℃, the homogenization temperature, keep for 8 hours, and cool to room temperature naturally after the keep warm;

[0056] (2) After homogenization, the ingot is subjected to extrusion deformation treatment. Before extrusion, the mold is first heated, the mold heating temperature is 300°C, the extrusion ratio is 7, and the extruded bar is obtained after extrusion;

[0057] (3) Perform upsetting deformation on the extruded bar obtained in step (2), the upsetting deformation amount is 40%; the first punch 2, the concave film 4 and the top block 5 of the upsetting deformation die, the heating temperature is 280℃ , Heat preservation for 0.5~2h; heating temperature of the extruded bar is 350℃, heat preservation for 1h; obtain th...

Embodiment 2

[0064] A forming method for improving the structure and performance of a rare earth magnesium alloy tapered cylindrical part, the forming method includes:

[0065] (1) Homogenize the Mg-9Gd-3RE rare earth magnesium alloy ingot, the homogenization temperature is 500 ℃, the homogenization temperature, keep for 8 hours, and cool to room temperature naturally after the keep warm;

[0066] (2) After homogenization, the ingot is subjected to extrusion deformation treatment. Before extrusion, the mold is first heated, the mold heating temperature is 300°C, the extrusion ratio is 7, and the extruded bar is obtained after extrusion;

[0067] (3) Perform upsetting deformation on the extruded bar obtained in step (2), the upsetting deformation amount is 40%; the first punch 2, the concave film 4 and the top block 5 of the upsetting deformation die, the heating temperature is 280℃ , Heat preservation for 0.5~2h; heating temperature of the extruded bar is 380℃, heat preservation for 1h; obtain th...

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Abstract

The invention relates to a forming method for improving the structure performance of a rare-earth magnesium alloy conical cylindrical part, belongs to the field of non-ferrous metal materials and technologies, and particularly relates to a forming method for improving the small-end structure performance of a Mg-9Gd-3RE heat-resistant rare-earth magnesium alloy conical cylindrical part. According to the forming method, for the heat resistance, the tensile strength of the mechanical property at 200 DEG C is not lower than 330 MPa, for the conical cylindrical part, the large-end diameter size (outer diameter ) is not lower than phi 200 mm, the small-end diameter size (outer diameter) is not lower than phi 80 mm, in case of the improvement on the structure performance of the rare-earth magnesium alloy cylindrical part, the mechanical property is improved, and the grain size is refined; and for the ratio of the height of the conical cylindrical part to the small-end outer diameter is not less than 7, in case of the improvement on the structure performance of the rare-earth magnesium alloy conical cylindrical, the mechanical property is improved, and the grain size is refined.

Description

Technical field [0001] The invention relates to a forming method for improving the structure and performance of a rare earth magnesium alloy tapered cylindrical part, belonging to the field of non-ferrous metal materials and processes, in particular to a method for improving the small end of a Mg-9Gd-3RE heat-resistant rare earth magnesium alloy tapered cylindrical part The method of forming the structure and properties. The heat resistance means that the mechanical properties and tensile strength at 200°C are not less than 330MPa. The cone-shaped cylindrical part has a large end diameter (outer diameter) not less than Φ200mm and a small end The diameter size (outer diameter) is not less than Φ80mm. Improving the structure and performance of the rare earth magnesium alloy cylindrical parts means improving the mechanical properties and refining the grain size. The ratio of the height of the cone-shaped cylindrical part to the outer diameter of the small end is not less than 7, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06B21J13/02B21J5/08B21C25/02B21C23/20B21C23/08
CPCB21C23/08B21C23/20B21C25/02B21J5/08B21J13/02C22C23/06C22F1/06
Inventor 张景琪姚草根刘凤娟赵磊张绪虎
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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