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Forging forming technology for large-size high-intensity and heat-resistant magnesium alloy thick plate

A forming process and magnesium alloy technology, which are applied in the deformation processing of magnesium alloys and the forging deformation field of Mg-RE alloys to achieve the effect of small composition segregation and fewer defects

Active Publication Date: 2014-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of rare earth elements increases the difficulty of deformation processing while improving the performance.
Rare earth magnesium alloy has high deformation resistance and narrow deformation temperature range
This has become a technical bottleneck restricting the preparation of deformed parts of Mg-Gd-Y series alloys
At present, there is no report on the preparation of high-performance, large-size Mg-Gd-Y alloy deformation parts.

Method used

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  • Forging forming technology for large-size high-intensity and heat-resistant magnesium alloy thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 : Mg-8Gd-3Y-0.6Zr (wt.%) alloy ingots with a diameter of Ф200mm and a length of 480 mm are machined by semi-continuous casting in a large furnace, and the ingots are homogenized and annealed. Heat the ingot at 520°C for 4 hours, perform upsetting and drawing forging on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-50%, and the reduction of the elongation pass is 5-10% . When the billet temperature is lower than 430°C, it is returned to the furnace for annealing, the annealing temperature is 510°C, and the holding time is 2h. After annealing, the upsetting process is repeated, and the ingot is forged into a billet of near-final size after three times of upsetting and drawing. The billet reserves 10-15% deformation in the height direction and width direction for the low temperature rapid forging process. After the billet was kept at 500 °C for 2 hours, it was quickly forged on an air hammer to forge a t...

Embodiment 2

[0016] Example 2: Firstly, use a large melting furnace to melt the raw materials, and then mechanically process a Mg-9Gd-4Y-0.6Zr (wt.%) (wt.%) alloy billet with a diameter of Ф300mm and a length of 400mm after semi-continuous casting, and uniformly cast the ingot annealing treatment. After 6 hours of heat preservation at 530°C, perform upsetting forging on a hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-50% for upsetting passes, and a reduction of 5-10% for elongating passes. When the surface temperature of the billet is lower than 430°C, it is returned to the furnace for annealing, the annealing temperature is 510°C, and the holding time is 2h. Repeat the upsetting and drawing process after annealing, and forge the ingot into a billet after three times of upsetting and drawing. The billet reserves 10-15% deformation in the height and width directions for the low-temperature rapid forging process. After the billet was kept at 480°C for 4 hour...

Embodiment 3

[0017] Example 3: Using a large melting furnace to melt raw materials, semi-continuous casting, machining a Mg-9Gd-2Y-0.6Zr (wt.%) alloy billet with a diameter of Ф300 mm and a length of 500 mm, and homogenizing annealing for the ingot. After 8 hours of heat preservation at 500 ℃, carry out upsetting and drawing forging billet opening on a hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-50% for upsetting passes, and a reduction of 5-10% for elongating passes. When the surface temperature of the ingot is lower than 430°C, return to the furnace for annealing, the annealing temperature is 490°C, and the holding time is 4 hours. Repeat the upsetting and drawing process after annealing, and forge the ingot into a billet after three times of upsetting and drawing. The billet reserves 10-15% deformation in the height and width directions for the low-temperature rapid forging process. After the billet was kept at 490°C for 3 hours, it was quickly forged ...

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Abstract

The invention discloses a forging forming technology for a large-size high-intensity and heat-resistant magnesium alloy thick plate and provides a forging forming technology for a magnesium alloy thick plate which is thicker than or as thick as 150mm. The forging forming technology comprises the steps of large-furnace smelting, semi-continuous casting, homogenizing annealing, variable-temperature multi-directional forging, fast forging and after-forming thermal treatment, wherein the variable-temperature multi-directional forging is executed on an oil press; before forging, the temperature of an ingot blank is preserved at 500-530 DEG C for 4-6 hours; the pressing speed is 200-400mm / min, the upsetting gate pressing amount is 30-50 percent, and the swaging gate pressing amount is 5-10 percent; the fast forging is executed on an air hammer; before fast forging, the temperature of the ingot blank is preserved at 480-500 DEG C for 2-4 hours. According to the forging forming technology, the high-temperature plasticity of a magnesium alloy is fully achieved, and the usability is obviously improved; at the temperature of 200 DEG C, the tensile strength of the thick plate in the length direction, the width direction and the height direction is higher than or equal to 330MPa, and the elongation rate is larger than or equal to 8 percent.

Description

technical field [0001] The invention relates to the field of deformation processing of magnesium alloys, in particular to the field of forging deformation of Mg-RE alloys. Background technique [0002] With the rapid development of the aerospace field in recent years, material weight reduction has become an important requirement in this field. Magnesium alloy has low density, high specific strength, and good shock resistance and noise reduction performance. It is an ideal lightweight material in the aerospace field. At present, magnesium alloys are mostly used in this field in the form of castings, with relatively few deformed parts. Magnesium alloys have few slip systems that can be activated at room temperature, are sensitive to deformation rates, and are difficult to deform and process. Magnesium alloys can be deformed to produce structural parts with diverse shapes and sizes, and the microstructure can be significantly improved to improve mechanical properties, which g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/06
Inventor 刘楚明肖宏超顾洪兵张帆刘东军沈光明蒋树农
Owner CENT SOUTH UNIV
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