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Forming method for improving structure performance of rare-earth magnesium alloy conical cylindrical part

A technology of microstructure and properties, rare earth magnesium, applied in metal processing equipment, metal extrusion dies, manufacturing tools, etc., can solve the problem of microstructure grain size growth, poor heating ability of rare earth magnesium alloy, affecting the use of warhead conical parts and other problems to achieve the effect of reducing heating times, improving mechanical properties, ensuring high performance and high density

Active Publication Date: 2019-04-09
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
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  • 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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  • Forming method for improving structure performance of rare-earth magnesium alloy conical cylindrical part

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Embodiment 1

[0054] A forming method for improving the microstructure and performance of a rare earth magnesium alloy conical cylindrical part, the forming method comprising:

[0055] (1) Homogenize the Mg-9Gd-3RE rare earth magnesium alloy ingot, the homogenization treatment temperature is 500°C, the homogenization temperature is kept for 8 hours, and naturally cooled to room temperature after the heat preservation is completed;

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

[0057] (3) Carry out upsetting deformation to the extruded rod obtained in step (2), the amount of upsetting deformation is 40%; the first punch 2, concave film 4 and top block 5 of the upsetting deformation mold, the heating temperature is 280 ℃ , keep warm for 0.5-2h; extrude the bar at a heat...

Embodiment 2

[0064] A forming method for improving the microstructure and performance of a rare earth magnesium alloy conical cylindrical part, the forming method comprising:

[0065] (1) Homogenize the Mg-9Gd-3RE rare earth magnesium alloy ingot, the homogenization treatment temperature is 500°C, the homogenization temperature is kept for 8 hours, and naturally cooled to room temperature after the heat preservation is completed;

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

[0067] (3) Carry out upsetting deformation to the extruded rod obtained in step (2), the amount of upsetting deformation is 40%; the first punch 2, concave film 4 and top block 5 of the upsetting deformation mold, the heating temperature is 280 ℃ , heat preservation 0.5 ~ 2h; extruded bar heatin...

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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 microstructure and performance of a rare earth magnesium alloy conical cylindrical part, which belongs to the field of nonferrous metal materials and technology, and in particular to a method for improving the small end of a Mg-9Gd-3RE heat-resistant rare earth magnesium alloy conical cylindrical part The forming method of structural properties, the heat resistance refers to the tensile strength of the mechanical properties at 200 ° C is not less than 330MPa, the tapered cylindrical part, the diameter (outer diameter) of the large end is not less than Φ200mm, and the small end The diameter size (outer diameter) is not less than Φ80mm. Improving the microstructure and properties of rare earth magnesium alloy cylindrical parts refers to improving the mechanical properties and refining the grain size. The ratio of the height of the tapered cylindrical part to the outer diameter of the small end is ...

Claims

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Application Information

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Patent Type & Authority Applications(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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