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A multi-stage annealing process for an ultra-high-strength and high-temperature resistant magnesium alloy billet

An annealing process and high temperature resistant technology, applied in the field of magnesium alloys, can solve problems such as easy cracking

Active Publication Date: 2018-07-13
湖南镁宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problem of easy cracking in the process of cooling, homogenizing and sawing due to the large residual stress of the ultra-high-strength rare earth magnesium alloy billet, the invention provides a multi-stage annealing process for this series of alloys

Method used

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  • A multi-stage annealing process for an ultra-high-strength and high-temperature resistant magnesium alloy billet
  • A multi-stage annealing process for an ultra-high-strength and high-temperature resistant magnesium alloy billet
  • A multi-stage annealing process for an ultra-high-strength and high-temperature resistant magnesium alloy billet

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Experimental program
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Embodiment 1

[0020] The ingredients of magnesium alloy are (mass percentage) Gd: 8.5%, Y: 2.5%, Zr: 0.5%, Ag: 0.1%, Er: 0.1%, and the rest is Mg and a small amount of unremovable impurities. The ingot diameter is Φ340mm. Immediately after the casting of the ingot, it was put into the furnace for annealing treatment. The heat treatment furnace was preheated to 100°C in advance, and the temperature of the ingot was raised to 200°C at a rate of 2°C / min after entering the furnace, and kept for 12 hours. After the first stage of heat preservation, the temperature was raised to 510°C at a rate of 5°C / min for 20 hours. After the heat preservation is over, cool to 100°C with the furnace, and then take it out of the furnace and air cool to room temperature. The quality of the Φ340mm ultra-high-strength magnesium alloy ingot treated by this process is qualified, without cracking, such as figure 1 shown.

Embodiment 2

[0022] The magnesium alloy ingredients are (mass percentage) Gd: 8.0%, Y: 2.0%, Zr: 0.5%, Ag: 0.1%, Er: 0.1%, and the rest is Mg and a small amount of unremovable impurities. The ingot diameter is Φ460mm. Immediately after the casting of the ingot, it was put into the furnace for annealing treatment. The heat treatment furnace was preheated to 150°C in advance, and the temperature of the ingot was raised to 250°C at a rate of 1°C / min after entering the furnace, and kept for 24 hours. After the first stage of heat preservation, the temperature was raised to 520°C at a rate of 3°C / min and held for 30h. After the heat preservation is over, cool to 70°C with the furnace, and then take it out of the furnace and air cool to room temperature. The quality of the Φ460mm ultra-high-strength magnesium alloy ingot treated by this process is qualified, without cracking, such as figure 2 shown.

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Abstract

The invention discloses a multi-level annealing technology for an ultrahigh strength high-temperature-resisting magnesium alloy large ingot blank. Alloys include, by mass percent, 8.0%-9.6% of Gd, 1.8%-3.2% of Y, 0.3%-0.7% of Zr, 0.02%-0.3% of Er and 0.02%-0.5% of Ag, wherein the ratio of the Gd component to the Y component is shown in the formula: 3<=Gd / Y<=5. According to the technology, a heat treatment furnace is preheated to 100-150 DEG C for heat preservation; after ingot blank casting is over, the ingot blank is transferred into the heat treatment furnace; the temperature is increased to 200-250 DEG C, stress relieving is conducted, and heat preservation is conducted for 12-24 h; the temperature is increased to 500-530 DEG C, homogenizing treatment is conducted, and heat preservation is conducted for 15-30 h; and after heat preservation is over, a cast ingot is subjected to furnace cooling to 70-100 DEG C, and furnace discharging air cooling is conducted to the room temperature. The technology process is simple, stress relieving and homogenizing heat treatment are organically integrated, the technology process is shortened, and the problem that the ultrahigh strength magnesium alloy large ingot blank is prone to fracture is solved.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to the annealing treatment of superhigh-strength magnesium alloy large ingots. Background technique [0002] Magnesium alloys have low density, high specific strength, high specific stiffness, and excellent damping properties, so they have broad application prospects in fields such as automobiles, aerospace, and weaponry that urgently need to reduce weight to improve fuel efficiency. However, the current commercial magnesium alloys, such as AZ31, AZ80, etc., have low absolute strength and poor heat resistance, which greatly limits the wide application of magnesium alloys. Therefore, ultra-high-strength and high-temperature-resistant rare-earth magnesium alloys have gradually aroused the interest of researchers. Not only their absolute strength is close to or even higher than that of the second-series aluminum alloys, but their heat resistance is also significantly better than that of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C21D1/26C22C23/06
CPCC21D1/26C22C23/06C22F1/06
Inventor 蒋树农余世伦高永浩刘楚明陈志永万迎春
Owner 湖南镁宇科技有限公司
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