Heat treatment method of mg-gd-y-zr series magnesium alloy and its large complex casting

A heat treatment method and magnesium alloy technology, applied in the field of metal structural materials, can solve problems such as cracking of castings, achieve the effects of increasing yield, saving water resources, and improving strength and toughness

Active Publication Date: 2016-10-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if magnesium alloys are to be widely used in spacecraft and weaponry, it is necessary to realize the transition of magnesium alloy parts from the current simple structure to the complex structure. Process (water quenching treatment after solid solution and aging, water temperature up to 95°C) to process castings with complex frame structures formed by Mg-Gd-Y-Zr series rare earth magnesium alloys, which are prone to cracking defects

Method used

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  • Heat treatment method of mg-gd-y-zr series magnesium alloy and its large complex casting
  • Heat treatment method of mg-gd-y-zr series magnesium alloy and its large complex casting
  • Heat treatment method of mg-gd-y-zr series magnesium alloy and its large complex casting

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Embodiment 1

[0040] This embodiment relates to a large and complex Mg-Gd-Y-Zr series magnesium alloy casting. Under the protection of solvent or gas, the Mg-Gd-Y-Zr series alloy is melted according to the distribution ratio of the components in Table 1 below and then heated up to 750°C, keep it for 1 hour, then lower the temperature to 690-720°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting. The obtained Mg-Gd-Y-Zr series magnesium alloy large complex casting (see figure 1 ) composition (mass percent %) data in Table 1.

[0041] This embodiment also relates to the heat treatment method for a large and complex casting made of the aforementioned Mg-Gd-Y-Zr series magnesium alloy: take casting 2 and put it into solid solution at 550°C, keep it warm for 8 hours, air cool to room temperature, and then heat Under aging, heat preservation for 8 hours, air cooling to room temperature, no deformation and cracking of castings after heat treatment, see image 3...

Embodiment 2

[0045]This embodiment relates to a large and complex Mg-Gd-Y-Zr series magnesium alloy casting. Under the protection of solvent or gas, the Mg-Gd-Y-Zr series alloy is melted according to the distribution ratio of the components in Table 1 below and then heated up to 750°C, keep it standing for 1 hour, then lower the temperature to 690-720°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting to obtain the complex magnesium alloy casting involved in the invention. The composition data of the obtained casting is shown in Table 1.

[0046] This example also relates to a heat treatment method for a large and complex casting made of the aforementioned Mg-Gd-Y-Zr series magnesium alloy: take the obtained casting 5 (peak aging state) and put it into solid solution at 525°C, keep it warm for 12 hours, and air cool to At room temperature, aging at 250°C, heat preservation for 10 hours, air cooling to room temperature, no deformation and cracking of casti...

Embodiment 3

[0050] This embodiment relates to a large and complex Mg-Gd-Y-Zr series magnesium alloy casting. Under the protection of solvent or gas, the Mg-Gd-Y-Zr series alloy is melted according to the distribution ratio of the components in Table 1 below and then heated up to 750°C, keep it for 1 hour, then lower the temperature to 690-720°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting. The compositional data of the obtained castings are shown in Table 1.

[0051] This embodiment also relates to the heat treatment method for a large and complex casting made of the aforementioned Mg-Gd-Y-Zr series magnesium alloy: take casting 7 and put it into solid solution at 500°C, keep it warm for 16 hours, air cool to room temperature, and then heat Under aging, heat preservation for 20 hours, air cooling to room temperature, no deformation and cracking of castings after heat treatment, see Figure 8 shown.

[0052] Traditional method: take casting 6 and p...

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Abstract

The invention discloses an Mg-Gd-Y-Zr magnesium alloy and a heat treatment method of a large-scale complex casting prepared from the Mg-Gd-Y-Zr magnesium alloy. The Mg-Gd-Y-Zr magnesium alloy comprises, by weight, 8.5-10% of Gd, 2.5-3.5% of Y, 0.4-0.6% of Zr, less than or equal to 0.15% of impurities and the balance Mg. The heat treatment method of the large-scale complex casting prepared from the Mg-Gd-Y-Zr magnesium alloy comprises the following steps of 1, carrying out solid solution of the Mg-Gd-Y-Zr magnesium alloy casting, carrying out heat preservation, and carrying out air cooling to a room temperature, and 2, carrying out aging treatment, carrying out heat preservation, and carrying out air cooling to the room temperature. The heat treatment method solves the problem that a rapid cooling process causes uneven shrinkage of all parts so that deformation and cracking phenomenon is produced and a yield is improved by 50%. The heat treatment method has the simple processes, saves water resource, is suitable for large-scale production, can be used in fields of automobiles, aviation and spaceflight, and war industry, and can satisfy requirements of a plurality of application occasions.

Description

technical field [0001] The invention relates to a magnesium alloy in the field of metal structural materials and a treatment method thereof, in particular to a heat treatment method of a Mg-Gd-Y-Zr series magnesium alloy and a large complex casting thereof. Background technique [0002] Due to the special working environment of aviation, aerospace and weaponry, structural weight reduction and structural load-bearing and functional integration are important directions for their development. Magnesium alloys have low density, high specific strength and specific stiffness, excellent shock resistance and cutting performance. Good and other advantages, it is a structural material with broad application prospects in aerospace and national defense military industries. A large number of magnesium alloys used to manufacture spacecraft and weaponry parts can achieve the greatest weight reduction effect, which will be an important direction for the development of aerospace and national...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06
Inventor 吴国华刘文才江龙康魏广玲丁文江
Owner SHANGHAI JIAO TONG UNIV
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