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A heat treatment method for magnesium alloys used in large-scale satellites

A heat treatment method and large-scale technology, which are applied in the field of heat treatment of magnesium alloys for large-scale satellites, can solve problems such as casting deformation, and achieve the effects of reducing casting stress, preventing new deformation, and avoiding casting cracking.

Inactive Publication Date: 2021-05-25
CENT SOUTH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, casting shrinkage creates casting stresses, and large castings are often severely deformed

Method used

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  • A heat treatment method for magnesium alloys used in large-scale satellites
  • A heat treatment method for magnesium alloys used in large-scale satellites
  • A heat treatment method for magnesium alloys used in large-scale satellites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Cast the momentum wheel bracket with the size of 1389mm×1000mm×900m (the structure diagram is as follows figure 1 , the magnesium alloy includes the following components by mass percentage: Al 8%, Zn 0.4%, Mn 0.2%, Fe 0.02%, Si 0.1%, Ni0.001%, Cu 0.08%, and the balance of Mg) and high rigid thermal conductivity tooling Solution treatment after assembly: first raise the temperature (heating rate: 15°C / min) to 365°C, and keep it at 365°C for 3 hours; then raise the temperature (heating rate: 15°C / min) to 420°C, and keep it at 420°C for 17 hours; Cool the castings and tooling with the furnace to 175°C and then take them out of the furnace and quickly remove them. After unloading, the temperature drops to 35°C; after the solution-treated momentum wheel bracket and the high-rigidity heat-conducting tooling are assembled with high external force, aging treatment: first heat up (The heating rate is 15°C / min) to 180°C, keep the temperature at 180°C for 17 hours, remove the cast...

Embodiment 2

[0049] Change the size to Momentum wheel bottom plate casting (structural schematic diagram as figure 2 , the magnesium alloy includes the following components by mass percentage: Al 8.5%, Zn 0.6%, Mn 0.4%, Fe 0.01%, Si0.15%, Ni0.007%, Cu 0.04%, the balance of Mg) and high rigidity thermal conductivity tooling Solution treatment after assembly: first raise the temperature (heating rate: 20°C / min) to 370°C, and keep it at 370°C for 2 hours; then raise the temperature (heating rate: 20°C / min) to 420°C, and keep it for 12 hours; Castings and tooling are cooled to 190°C with the furnace and then come out of the furnace quickly, and the temperature drops to 25°C after demounting; after the solution-treated momentum wheel bottom plate and the high-rigidity and easy-to-heat-conducting tooling are assembled with high external force, aging treatment is carried out: firstly, the temperature is raised (The heating rate is 20°C / min) to 190°C, keep the temperature at 190°C for 8 hours, ...

Embodiment 3

[0051] A momentum wheel bracket casting (8.5% Al, 0.6% Zn, 0.4% Mn, 0.01% Fe, 0.15% Si, 0.007% Ni, Cu 0.04%, and the balance of Mg) with a size of 1389mm×1000mm×900m and high After the rigid heat-conducting tooling is assembled, solution treatment is carried out: firstly, the temperature is raised (the heating rate is 20°C / min) to 360°C, and the temperature is kept at 360°C for 3 hours; then the temperature is raised (the heating rate is 20°C / min) to 415°C, and the Insulate for 18 hours; finally cool the castings and tooling to 170°C with the furnace and take them out of the furnace quickly. Treatment: first raise the temperature (heating rate is 20°C / min) to 195°C, keep it at 195°C for 16 hours, remove the casting and tooling quickly after they are taken out of the furnace, and the temperature drops to 10°C after removal. Take the standard sample and measure the tensile strength at room temperature as 295MPa, the yield strength as 167MPa, and the elongation as 7.5%.

[0052]...

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Abstract

The invention provides a heat treatment method for a magnesium alloy used in large-scale satellites, and belongs to the technical field of heat treatment of magnesium alloys. The invention uses high-rigidity and heat-conducting tooling, which can ensure that the tooling itself does not deform during heat treatment and shape correction, and is easy to strictly control the deformation of the casting during the stress release process, and then strictly control the size of the casting. Heat conduction can ensure the uniformity of tooling and casting temperature and avoid new deformation; if the temperature drops too much during the unmounting process, the temperature inconsistency between the first unmounting and the last unmounting part and the difference in stress state will cause new deformation of the casting . The invention controls the temperature drop at 50°C and 20°C, which can prevent new deformation.

Description

technical field [0001] The invention relates to the technical field of heat treatment of magnesium alloys, in particular to a heat treatment method of magnesium alloys for large-size satellites. Background technique [0002] Magnesium alloy is the lightest available metal structure material, which has the advantages of low density, high specific strength, good thermal conductivity, strong shock absorption capacity, easy cutting, recyclable and stable size, etc. It is extremely important in the fields of aerospace, national defense and military. application value and broad application prospects. [0003] Magnesium has a close-packed hexagonal crystal structure and poor plastic deformation ability. Cast magnesium alloys are widely used in large-scale components. However, casting shrinkage creates casting stresses, and large-size castings are often severely deformed. Contents of the invention [0004] In view of this, the object of the present invention is to provide a heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02
CPCC22C23/02C22F1/06
Inventor 曾广张高龙万迎春韩修柱王登峰化宜文张立新高峰刘楚明
Owner CENT SOUTH UNIV
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