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Mg-Gd-Y rare earth magnesium alloy cast ingot homogenization heat treatment method

A homogeneous heat treatment and alloy ingot technology, which is applied in the field of magnesium alloy material preparation, can solve the problems of impact, large casting stress, and inapplicability, and achieve the effect of simple and clear process, elimination of internal stress, and accurate requirements

Inactive Publication Date: 2020-08-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of high rare earth elements will cause greater casting stress in the casting process
However, the traditional homogenization method for other rare earth magnesium alloys cannot be applied to Mg-Gd-Y rare earth magnesium alloys, especially the second phase strengthening effect of the unique LPSO phase will be affected, and Mg-Gd-Y rare earth magnesium alloys cannot be fully utilized. The advantages

Method used

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  • Mg-Gd-Y rare earth magnesium alloy cast ingot homogenization heat treatment method
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  • Mg-Gd-Y rare earth magnesium alloy cast ingot homogenization heat treatment method

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Embodiment 1

[0026] The invention provides a method for homogenizing heat treatment of a Mg-Gd-Y rare earth magnesium alloy ingot, which specifically includes the following steps:

[0027] Step 1: According to the composition requirements of the magnesium alloy, add pure metals and intermediate metals containing different elements into the melting furnace, turn on the resistance heating device of the melting furnace and heat to 760°C, so that each component is melted into a uniform metal melt , heat preservation until the alloy components are melted into a uniform metal melt with a specified composition for casting;

[0028] Step 2: Preheat the heat treatment furnace to 500-520°C at a heating rate of 100°C / h;

[0029] Step 3: After the molten metal in step 1 is cast into a magnesium alloy billet, it is rapidly cooled to 200°C by blast cooling, and then quickly transferred to a preheated heat treatment furnace;

[0030] Step 4: Keep the magnesium alloy billet transferred to the preheated h...

Embodiment 2

[0034] The invention provides a method for homogenizing heat treatment of a Mg-Gd-Y rare earth magnesium alloy ingot, which specifically includes the following steps:

[0035] Step 1: According to the composition requirements of the magnesium alloy, add pure metals and intermediate metals containing different elements into the melting furnace, turn on the resistance heating device of the melting furnace and heat to 760°C, so that each component is melted into a uniform metal melt , heat preservation until the alloy components are melted into a uniform metal melt with a specified composition for casting;

[0036] Step 2: Preheat the heat treatment furnace to 500-520°C at a heating rate of 100°C / h;

[0037] Step 3: After the molten metal in step 1 is cast into a magnesium alloy billet, it is rapidly cooled to 200°C by blast cooling, and then quickly transferred to a preheated heat treatment furnace;

[0038] Step 4: Insulate the magnesium alloy billet transferred to the preheat...

Embodiment 3

[0042] The invention provides a method for homogenizing heat treatment of a Mg-Gd-Y rare earth magnesium alloy ingot, which specifically includes the following steps:

[0043] Step 1: According to the composition requirements of the magnesium alloy, add pure metals and intermediate metals containing different elements into the melting furnace, turn on the resistance heating device of the melting furnace and heat to 760°C, so that each component is melted into a uniform metal melt , heat preservation until the alloy components are melted into a uniform metal melt with a specified composition for casting;

[0044] Step 2: Preheat the heat treatment furnace to 500-520°C at a heating rate of 100°C / h;

[0045]Step 3: After the molten metal in step 1 is cast into a magnesium alloy billet, it is rapidly cooled to 200°C by blast cooling, and then quickly transferred to a preheated heat treatment furnace;

[0046] Step 4: Keep the magnesium alloy billet transferred to the preheated he...

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Abstract

The invention discloses a Mg-Gd-Y rare earth magnesium alloy cast ingot homogenization heat treatment method, and particularly relates to the technical field of magnesium alloy material preparation. The homogenization heat treatment method comprises the following steps that a magnesium alloy cast ingot is placed in a homogenization heat treatment furnace, the temperature is increased to be 520-525DEG C and kept for at least 10-12 hours, air cooling is carried out at the speed of 60-80 DEG C / h, then cooling is carried out until the room temperature is achieved, and a finished product is obtained. According to the method, a reasonable homogenization annealing system is adopted, so that the component segregation and internal stress of a Mg-Gd-Y rare earth magnesium alloy are eliminated, andparticularly, the growth of strengthening phase LPSO phases of the Mg-Gd-Y alloy in a matrix and crystal grains can be effectively promoted, the strength and heat resistance of the alloy are effectively improved, and the preparation is provided for subsequent plastic forming processing process; and moreover, the method is suitable for rare earth magnesium alloy castings of various sizes, and the performance of rare earth magnesium alloy casting material for aerospace and rail transit is improved.

Description

technical field [0001] The present invention relates to the technical field of magnesium alloy material preparation, more specifically, the present invention is a method for eliminating the composition segregation of Mg-Gd-Y rare earth magnesium alloy and eliminating casting stress, as well as promoting the growth of the special strengthening phase LPSO phase and improving the uniformity of the structure , Heat treatment method for mechanical properties. Background technique [0002] Magnesium alloy is a new type of light alloy with light weight and high strength, high specific stiffness and specific strength. It has good electrical and thermal conductivity, good electromagnetic shielding performance, good damping and shock absorption effect, and easy cutting. At present, the application of magnesium alloy It is more and more widely used in aerospace, military industry, rail transit, automobile and other fields, but the traditional wrought magnesium alloy will produce compos...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 黄元春雒晓宇刘良春
Owner CENT SOUTH UNIV
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