Multi-heat treatment process for AQ80M magnesium alloy heavy ingot billet composition homogenization

A technology of composition homogenization and magnesium alloy, applied in the field of magnesium alloy heat treatment

Active Publication Date: 2017-08-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the homogenization heat treatment process of AQ8

Method used

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  • Multi-heat treatment process for AQ80M magnesium alloy heavy ingot billet composition homogenization
  • Multi-heat treatment process for AQ80M magnesium alloy heavy ingot billet composition homogenization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put high-purity magnesium-aluminum-zinc ingots and MnCl in the smelting furnace in sequence 2 Granules, Mg-RE, Mg-Ca intermediate alloys and high-purity silver, the melting temperature is controlled at 660-790 °C; after the materials are melted, the slag is removed, and the bottom of the melt is filled with argon gas to stir and refine for 10 minutes; after refining, let it stand and cool down to 690 ℃, keep warm for 1h; press the melt into the electromagnetic mold, wait for the melt above the ingot to solidify and crystallize and the liquid level is 65mm from the vertical height of the upper surface of the mold, start the electromagnetic coil in the mold and start the casting machine at the same time to vertically For ingot pulling, the furnace temperature is 680-685°C during stable casting, the melt temperature in the splitter plate is 646-650°C, the ingot pulling speed is 36mm / min, and the cooling water flow rate is 26m 3 / h, the electromagnetic frequency applied by ...

Embodiment 2

[0021] Put high-purity magnesium-aluminum-zinc ingots and MnCl in the smelting furnace in sequence 2 Granules, Mg-RE, Mg-Ca intermediate alloys and high-purity silver, the melting temperature is controlled at 665-800 °C; after the materials are melted, the slag is removed, and the bottom of the melt is filled with argon gas for stirring and refining for 12 minutes; after refining, let stand and cool down to 688 ℃, keep warm for 1.5h; press the melt into the electromagnetic crystallizer, when the melt above the ingot head solidifies and crystallizes and the liquid level is 50mm vertically from the upper surface of the mold, start the electromagnetic coil in the mold and start the casting machine at the same time Vertical ingot pulling, the temperature in the furnace is 682-688°C during stable casting, the melt temperature in the splitter plate is 648-653°C, the ingot pulling speed is 36mm / min, and the cooling water flow rate is 34m 3 / h, the electromagnetic frequency applied by...

Embodiment 3

[0023] Put high-purity magnesium-aluminum-zinc ingots and MnCl in the smelting furnace in sequence 2 Granules, Mg-RE, Mg-Ca intermediate alloy and high-purity silver, the melting temperature is controlled at 670-780 °C; after the material is melted, the slag is removed, and the bottom of the melt is filled with argon gas for stirring and refining for 12 minutes; after refining, let it stand and cool down to 690 ℃, keep warm for 1h; press the melt into the electromagnetic crystallizer, when the melt above the ingot head is solidified and crystallized and the vertical height of the liquid level from the upper surface of the mold is 40mm, start the electromagnetic coil in the mold and start the casting machine at the same time to vertically For ingot pulling, the temperature in the furnace is 685-688°C during stable casting, the melt temperature in the splitter plate is 656-660°C, the ingot pulling speed is 21mm / min, and the cooling water flow rate is 40m 3 / h, the electromagneti...

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Abstract

The invention discloses a multi-heat treatment process for AQ80M magnesium alloy heavy ingot billet composition homogenization. An aimed alloy is prepared from the components in percentage by mass: 7.5 to 9.0 percent of Al, 0.02 to 0.80 percent of Ag, 0.35 to 0.55 percent of Zn, 0.05 to 0.30 percent of Mn, 0.01 to 0.10 percent of RE, and 0.001 to 0.020 percent of Ca. The multi-heat treatment process comprises the steps of firstly placing a large-size ingot billet in an annealing furnace, then heating to 240 to 260 DEG C, and heat-insulating for 4 to 10h; heating the annealing furnace to 410 to 420 DEG C, and heat-insulating for 32 to 48h; and finally stopping heat-insulating the annealing furnace, rising a furnace door, cooling the ingot billet to 250 to 300 DEG C along with the furnace, then pushing out of a hearth, and air cooling to the room temperature. The multi-heat treatment process for AQ80M magnesium alloy heavy ingot billet composition homogenization provided by the invention adopts a multi-homogenization process, so that the problems of excessive heat stress and heat crack occurred during the solution treatment of the large-size ingot billet are solved, a thick and big second phase is promoted to be fully dissolved in a matrix, and alloying elements are promoted to distribute uniformly.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy heat treatment, and relates to a multi-stage heat treatment process for homogenizing components of an AQ80M magnesium alloy billet. Background technique [0002] Magnesium alloys are known as "green engineering materials in the 21st century" because of their advantages such as low density, high specific strength, good damping performance, recyclability and pollution-free, and have become the structural materials with the most development potential in the fields of aerospace, national defense and military industry. one. AQ80M (Mg-Al-Zn-Ag series) magnesium alloy, as a medium-strength heat-resistant magnesium alloy, has good hot workability, room temperature mechanical properties and low cost, and it can be improved by adding a small amount of Ag element. High-temperature mechanical properties at a service temperature of 100-150°C; at present, this alloy has been successfully applied to the...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/02C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 蒋树农曾钢刘楚明高永浩许诗源魏建胜
Owner CENT SOUTH UNIV
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