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Rare earth magnesium alloy cast ingot heat treatment technology

A technology of alloy casting ingot and rare earth magnesium, which is applied in the field of heat treatment process of rare earth magnesium alloy ingot casting, and can solve the problems of not realizing the potential of rare earth magnesium alloy

Active Publication Date: 2018-12-18
航天科工(长沙)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods of air cooling and single-stage homogenization heat treatment after casting of magnesium alloys have not brought out the potential of rare earth magnesium alloys

Method used

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  • Rare earth magnesium alloy cast ingot heat treatment technology
  • Rare earth magnesium alloy cast ingot heat treatment technology
  • Rare earth magnesium alloy cast ingot heat treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mass percentage of magnesium alloy ingredients is Gd: 9%, Y: 3.0%, Nd: 0.5%, Ce: 0.5%, Zr: 0.6%, and the rest is Mg and a small amount of unremovable impurities. The heat treatment process includes the following steps:

[0029] Preheat the heat treatment furnace to 200°C;

[0030] After the magnesium alloy billet is cast, it is rapidly cooled to 100°C by means of cold water spray;

[0031] Immediately after cooling, put it into the furnace for heat treatment and heat preservation. The heat treatment furnace is kept at 200 ° C for 4 hours;

[0032] After the first stage of heat preservation is completed, the heat treatment furnace raises the furnace temperature to 300°C at a heating rate of 250°C / h, and holds for 2 hours;

[0033] After the second stage of heat preservation is completed, the heat treatment furnace raises the temperature of the furnace to 510°C at a heating rate of 250°C / h, and holds the temperature for 24 hours. Then cool to room temperature with ...

Embodiment 2

[0035] The mass percentage of magnesium alloy ingredients is Gd: 9%, Y: 3.0%, Nd: 0.5%, Ce: 0.5%, Zr: 0.6%, and the rest is Mg and a small amount of unremovable impurities. The heat treatment process includes the following steps:

[0036] Preheat the heat treatment furnace to 250°C;

[0037] After the magnesium alloy billet is cast, it is rapidly cooled to 250°C by means of cold water spray;

[0038] Immediately after cooling, put it into the furnace for heat treatment and heat preservation. The heat treatment furnace is kept at 250 ° C for 16 hours;

[0039] After the first stage of heat preservation is completed, the heat treatment furnace raises the furnace temperature to 400°C at a heating rate of 150°C / h, and holds for 4 hours;

[0040] After the second stage of heat preservation is completed, the heat treatment furnace raises the temperature of the furnace to 500°C at a heating rate of 150°C / h, and holds the temperature for 8 hours. Then cool to room temperature with ...

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Abstract

The invention discloses a rare earth magnesium alloy cast ingot heat treatment technology. A magnesium alloy comprises, by mass percent, 8.50%-9.50% of Gd, 3.0%-4.0% of Y, 0.5%-1.0% of Nd, 0.5%-1.0% of Ce, 0.40%-0.60% of Zr and the balance Mg and non-removable impurity elements. The rare earth magnesium alloy cast ingot heat treatment technology comprises the following steps that firstly, a heat treatment furnace is preheated to 200 DEG C-250 DEG C; secondly, after a magnesium alloy blank is cast and formed, rapid cooling is conducted to 100 DEG C-250 DEG C in a cold water spraying manner; thirdly, heat preservation of the heat treatment furnace is conducted for 4-16 h at the temperature ranging from 200 DEG C to 250 DEG C; fourthly, the furnace temperature of the heat treatment furnace isincreased to 300 DEG C-400 DEG C with the temperature rise speed of 150-250 DEG C / h, and heat preservation is conducted for 2-4 h; and fifthly, the furnace temperature of the heat treatment furnace is increased to 500 DEG C-510 DEG C with the temperature rise speed of 150-250 DEG C / h, and heat preservation is conducted for 8-24 h, and then furnace cooling is conducted to the room temperature. Through mutual cooperation of the selected proper heat treatment temperature, the selected proper heat preservation time and the cooling manner technology for the rear earth magnesium alloy, magnesium alloy grains can be effectively refined, the room-temperature tensile strength of the finally-obtained blank is larger than or equal to 270 MPa, the yield strength is larger than or equal to 150 MPa, and elongation rate is larger than or equal to 5%.

Description

technical field [0001] The invention relates to a rare-earth magnesium alloy ingot heat treatment process, which belongs to the technical field of magnesium alloy heat treatment processing, and specifically relates to a heat treatment method for preventing magnesium alloy grain growth and ingot cracking, and improving structure uniformity and mechanical properties. Background technique [0002] Magnesium alloy is a light alloy with high specific strength, high specific stiffness, good thermal and electrical conductivity, good electromagnetic shielding performance, damping and vibration reduction performance, easy cutting and low processing cost, etc. It is used in aerospace, automobile, Electronic products and other fields have broad application prospects. Commonly used Mg-Al alloys (AZ31, AZ80, AZ91, etc.) have been used in the manufacture of aircraft, automotive dashboards, and notebook computer casings. However, due to the low strength and poor creep resistance of Mg-Al ...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/06
Inventor 张振宇熊雯瑛刘海平肖宏超李轶
Owner 航天科工(长沙)新材料研究院有限公司
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