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Homogenization heat treatment process of large-size magnesium alloy ingot

A technology for homogenizing heat treatment and magnesium alloys, applied in the field of magnesium alloy material preparation, can solve problems such as difficulty in handling large-size magnesium alloy ingots, and achieve the effects of facilitating later deformation and heat treatment, avoiding local over-burning, and being uniformly heated.

Active Publication Date: 2013-12-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the existing homogenization heat treatment technology is difficult to deal with large-size magnesium alloy ingots, the present invention proposes a suitable large-size magnesium alloy based on releasing casting stress, preventing over-burning and cracking, and starting from the heating rate and cooling method. Ingot Homogenization Heat Treatment Process

Method used

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  • Homogenization heat treatment process of large-size magnesium alloy ingot
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  • Homogenization heat treatment process of large-size magnesium alloy ingot

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Charge the Mg-Al-Zn magnesium alloy semi-continuous ingot cold furnace with a diameter of Φ300mm and a height of 650mm, and rapidly raise the temperature from room temperature to 320°C at a rate of 30°C / min for 10 minutes. After reaching 320°C, The heating rate was 12°C / h, and the temperature was raised for 7.5 hours. After reaching 410°C, the temperature was kept for 20 hours, and then the furnace was blown to cool with a cooling rate of 2°C / min to obtain a finished product.

Embodiment 2

[0028] Charge a Mg-Al-Zn magnesium alloy semi-continuous ingot cold furnace with a diameter of Φ350mm and a height of 650mm, and rapidly raise the temperature from room temperature to 350°C at a rate of 15°C / min for 23 minutes. After reaching 350°C, The heating rate was 17.5°C / h and the temperature was raised for 4 hours. After reaching 420°C, the temperature was kept for 25 hours, and then cooled by blasting with the furnace at a cooling rate of 7°C / min; the finished product was obtained. The metallographic structure of the finished product is as image 3 shown by image 3 It can be seen that after homogenization treatment, the as-cast structure of the alloy basically disappears, and clear grain boundaries appear.

Embodiment 3

[0030] Charge the Mg-Al-Zn magnesium alloy semi-continuous ingot cold furnace with a diameter of Φ350mm and a height of 700mm. Rapidly raise the temperature from room temperature to 350°C at a rate of 20°C / min for 15 minutes. After reaching 350°C, The heating rate was 25°C / h, and the temperature was raised for 3.2 hours. After reaching 430°C, the temperature was kept for 30 hours, and then cooled by blasting with the furnace, and the cooling rate was 9°C / min; the finished product was obtained.

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Abstract

The invention relates to a homogenization heat treatment process of a large-size magnesium alloy ingot, belonging to the technical field of magnesium alloy material preparation. The process is characterized by heating a large-size magnesium alloy ingot to 320-350 DEG C at a heating rate of 10-30 DEG C / min and then heating the large-size magnesium alloy ingot to 410-430 DEG C at a heating rate of 12-27 DEG C / h, insulating the large-size magnesium alloy ingot and then cooling the large-size magnesium alloy ingot to the room temperature at a cooling speed of 2-10 DEG C / min, thus obtaining the finished product, wherein the diameter phi of the large-size magnesium alloy ingot is not less than 220mm. The process has the beneficial effects that quick heating is carried out at the early stage of homogenization to release the casting stress to prevent growth of grains in the homogenization process; later, slow heating is carried out till the homogenization temperature to ensure that all the parts are heated uniformly to prevent overburning; then cooling is carried out at a cooling speed of 2-10 DEG C / min till the room temperature is reached, thus preventing cracking due to too quick cooling and also avoiding precipitation strengthening, which is unfavourable for subsequent deformation, due to too slow cooling; dendritic segregation of the large-size magnesium alloy ingot treated by the process is basically eliminated and the components in various parts of the large-size magnesium alloy ingot are uniform; besides, the equipment used in the process is a conventional resistance furnace, is mature in process and is safe and reliable.

Description

technical field [0001] The invention discloses a homogeneous heat treatment process for large-size magnesium alloy ingots, belonging to the technical field of magnesium alloy material preparation. Background technique [0002] Magnesium alloy has a series of advantages in physical and mechanical properties such as light specific gravity, good damping performance, high specific strength and specific stiffness, excellent casting and cutting performance, and is widely used in aerospace, electronics, automobiles, national defense and other fields. Magnesium alloys have poor plasticity and are difficult to deform. Cast magnesium alloys account for 90% of the total magnesium alloys used. In cast magnesium alloys, Mg-Al alloys do not contain expensive rare earth elements and Zr elements, so Mg-Al alloys have more Large application space. However, dendrite segregation will occur during the casting process of Mg-Al alloys, and the coarse second phase will hinder the plastic deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 李慧中欧阳杰梁霄鹏姜俊李轶黄岚刘楚明
Owner CENT SOUTH UNIV
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