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A kind of heat treatment process for large-scale thin-wall casting of high-strength magnesium alloy

A technology of thin-walled castings and magnesium alloys, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of large-scale casting deformation, serious hot cracking tendency, and scrapped castings, so as to reduce casting stress, avoid cracking, and ensure The effect of uniformity

Active Publication Date: 2021-07-13
TIANJIN AEROSPACE ELECTROMECHANICAL EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solidification and heat treatment of castings will generate stress, and large-size castings are usually severely deformed
In particular, rare earth-containing magnesium alloys have a serious tendency to hot cracking due to the addition of rare earth elements, and many castings have cracks during heat treatment, resulting in castings being scrapped.

Method used

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  • A kind of heat treatment process for large-scale thin-wall casting of high-strength magnesium alloy
  • A kind of heat treatment process for large-scale thin-wall casting of high-strength magnesium alloy
  • A kind of heat treatment process for large-scale thin-wall casting of high-strength magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A heat treatment process for large-scale thin-walled castings of high-strength magnesium alloys, specifically comprising the following steps:

[0046] A large thin-walled casting with a size of φ1000*90 is preliminarily marked and a reference plane is roughly machined for every projected plane area not greater than 1 square meter.

[0047] At room temperature, assemble large thin-walled component castings and tooling: fit the castings to the high-rigid platform A, and use the upper positioning nuts on the supporting points on the supporting screw to support the high point obtained according to the result of scribing, and apply force to the screw The lower nut of the force application point configured on the top is screwed up, and the high-rigid pressure plate uses the lever principle to exert downward pressure on the high point on the casting; according to the low point obtained by the marking result, use the lower positioning nut of the support point configured on the s...

Embodiment 2

[0052] A heat treatment process for large-scale thin-walled castings of high-strength magnesium alloys, specifically comprising the following steps:

[0053] A large thin-walled casting with a size of 570*600*170 is removed from the riser, preliminarily scribed, and a datum plane is roughly machined.

[0054] Assemble the large thin-walled casting with the high-rigidity and easy-to-heat-conducting tooling. The assembly process is the same as that in Example 1. After assembly, the casting is subjected to solution treatment: first, the temperature is raised to 250°C at a heating rate of 20°C / min, and the temperature is kept at 250°C for 2 hours; Then the temperature was raised to 500°C, the heating rate was 10°C / min, and the temperature was kept at 500°C for 8h.

[0055] After solid solution, the castings and tooling are taken out of the furnace to be cooled by strong air, and the quenching air speed is 4m / s. In the temperature range of 250-350°C, the castings are quickly releas...

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Abstract

The invention provides a high-strength magnesium alloy large-scale thin-walled casting heat treatment process, which is characterized in that it includes the following steps: a. Preliminarily scribing the large-scale thin-walled casting and processing at least one reference plane; b. Solid solution treatment is carried out after the rigid and easy-to-heat-conducting tooling is assembled; c. Aging treatment is carried out after the solution-treated castings and high-rigid and easy-to-heat-conducting tooling are assembled with high external force. If the dimensional accuracy requirements are not met, local high external force loading is carried out for secondary aging. The present invention can eliminate the large thin wall caused by casting stress by using special tooling during solution treatment and aging treatment, and adjusting parameters such as heating rate, holding time, quenching air rate, and dismounting temperature drop of solution treatment and aging treatment. Component deformation, cracks, and increase the strength.

Description

technical field [0001] The invention belongs to the field of heat treatment of magnesium alloys, in particular to a heat treatment process for large-scale thin-walled castings of high-strength magnesium alloys. 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 ability, 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 components. However, the solidification and heat treatment of castings will generate stress, and large-size castings will usually be severely deformed. In particular, rare earth-containing magnesium alloys have a seriou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C21D9/00
CPCC21D9/0025C22F1/06
Inventor 王玉凤张高龙焦云雷付彬国宁志良王飞
Owner TIANJIN AEROSPACE ELECTROMECHANICAL EQUIP RES INST
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