Heat treatment process for large thin-wall casting of high-strength magnesium alloy

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

Active Publication Date: 2020-08-07
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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  • Heat treatment process for large thin-wall casting of high-strength magnesium alloy
  • Heat treatment process for large thin-wall casting of high-strength magnesium alloy
  • Heat treatment process for large thin-wall casting of high-strength magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A heat treatment process for high-strength magnesium alloy large thin-walled castings specifically includes the following steps:

[0046] The large thin-walled castings with the size of φ1000*90 are preliminarily scribed and a datum plane is roughed out for every projected plane area not greater than 1 square meter.

[0047] Assemble large thin-walled component castings and tooling at room temperature: Attach the castings to the high-rigidity platform A, and use the upper positioning nut on the supporting point of the supporting screw to support the high point obtained according to the scribing result, and apply force to the screw The nut at the lower part of the upper force point is screwed up, the high-rigidity pressure plate uses the principle of leverage to exert downward pressure on the high point on the casting; according to the low point obtained by the scribing result, the nut is positioned under the support point configured on the support screw For support, the uppe...

Embodiment 2

[0052] A heat treatment process for high-strength magnesium alloy large thin-walled castings specifically includes the following steps:

[0053] The large thin-walled castings with dimensions of 570*600*170 are removed from the pouring riser, initially scribed, and a datum surface is roughed out.

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

[0055] After solid solution, the castings and tooling are taken out of the furnace and forced to air cooling, the quenching air rate is 4m / s, within the temperature range of 250-350℃, the castings are quickly released from the high-rigidity platform A and transferred to another tooling at room temperature , And quickl...

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Abstract

The invention provides a heat treatment process for a large thin-wall casting of high-strength magnesium alloy. The heat treatment process is characterized by comprising the following steps of a, preliminarily scribing the large thin-wall casting and machining at least one reference plane; b, assembling the casting and a high-rigidity and easy-heat-conductive tool and then performing solution treatment; and c, performing high-external-force assembling on the casting subjected to solution treatment and the high-rigidity easy-heat-conductive tool, and then performing aging treatment, performingscribing detection on the casting and the tool after the casting and the tool are taken out of a furnace to be air-cooled, and if the local part does not meet the dimensional precision requirement, performing local high-external-force loading for secondary aging. According to the heat treatment process provided by the invention, a special tool is used during solution treatment and aging treatment,parameters such as heating speed, heat preservation time, a quenching air rate and stripping temperature drop of the solution treatment and the aging treatment are adjusted, deformation and cracks, caused by casting stress, of the large thin-wall component can be eliminated, and the strength is improved.

Description

Technical field [0001] The invention belongs to the field of heat treatment of magnesium alloys, and in particular relates 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 structural material. It has the advantages of low density, high specific strength, good thermal conductivity, strong shock absorption, easy cutting, recyclability, and dimensional stability. It is extremely important in aerospace, defense and military fields. The 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 casting solidification and heat treatment process will produce stress, and large-size castings usually undergo severe deformation. In particular, magnesium alloys containing rare earth elements have ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C21D9/00
CPCC21D9/0025C22F1/06
Inventor 王玉凤张高龙焦云雷王飞
Owner TIANJIN AEROSPACE ELECTROMECHANICAL EQUIP RES INST
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