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Process for forming moderately-strong heat-resisting magnesium alloy die-forged piece

A forming process, magnesium alloy technology, applied in the field of magnesium alloy forging and forming, can solve the problems of difficult preparation of large-scale, high-quality and high-performance ingots, low alloy strength, poor processing plasticity, etc., to achieve the suppression of forging deformation inhomogeneity, metal The effect of uniform flow and prevention of coarsening of thermally deformed grains

Active Publication Date: 2014-05-14
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still the following technical bottlenecks in the processing and preparation of large-scale high-performance magnesium alloy structural parts: low alloy strength, poor corrosion resistance, poor processing plasticity, difficulty in preparing large-scale high-quality high-performance ingots, and deformation due to temperature fluctuations. Uniform presence of severe anisotropy, etc.

Method used

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  • Process for forming moderately-strong heat-resisting magnesium alloy die-forged piece
  • Process for forming moderately-strong heat-resisting magnesium alloy die-forged piece
  • Process for forming moderately-strong heat-resisting magnesium alloy die-forged piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 : Firstly melt the alloy raw materials in a large furnace, and semi-continuously cast ingots of Φ380×700mm (chemical composition (wt.%): Al 7.5~9.0%, Ag 0.02~0.80%, Zn 0.35~0.55%, Mn 0.05~ 0.20%, RE 0.01~0.10%, Ca 0.001~0.020%, Fe≤0.02%, Si≤0.05%, Cu≤0.02%, Ni≤0.001%, and the rest is Mg). Two-stage homogenization annealing is carried out on the ingot. The annealing process is: 270°C for 12h, then heating up to 400°C for 30h. After the ingot was kept at 400~410℃ for 14 hours, it was subjected to upsetting multi-directional temperature-variable forging, and after 3 passes of upsetting and elongating multi-directional forging, it was returned to the furnace for annealing. The reduction speed of multi-directional forging is 200-400mm / min, the reduction of upsetting pass is 30-35%, the reduction of elongating pass is 5-8%, and the temperature of upper and lower cutting boards is 240-250°C. The ingot is subjected to multi-directional temperature-variable forging ...

Embodiment 2

[0019] Example 2 : Firstly melt the alloy raw materials in a large furnace, and semi-continuously cast ingots of Φ380×700mm (chemical composition (wt.%): Al 7.5~9.0%, Ag 0.02~0.80%, Zn 0.35~0.55%, Mn 0.05~ 0.20%, RE 0.01~0.10%, Ca 0.001~0.020%, Fe≤0.02%, Si≤0.05%, Cu≤0.02%, Ni≤0.001%, and the rest is Mg). Two-stage homogenization annealing is carried out on the ingot, and the annealing process is as follows: 12 hours at 270°C, and then the temperature is raised to 400°C for 30 hours. After the ingot is kept at 400~410℃ for 14 hours, it is subjected to upsetting multi-directional temperature-variable forging, and after 3 passes of upsetting and multi-directional deformation, it is returned to the furnace for annealing. The reduction speed of multi-directional forging is 200-400mm / min, the reduction of upsetting pass is 30-35%, the reduction of elongating pass is 5-8%, and the temperature of upper and lower cutting boards is 240-250°C. The ingot was subjected to multi-directi...

Embodiment 3

[0020] Example 3 : Firstly melt the alloy raw materials in a large furnace, and semi-continuously cast ingots of Φ380×700mm (chemical composition (wt.%): Al 7.5~9.0%, Ag 0.02~0.80%, Zn 0.35~0.55%, Mn 0.05~ 0.20%, RE 0.01~0.10%, Ca 0.001~0.020%, Fe≤0.02%, Si≤0.05%, Cu≤0.02%, Ni≤0.001%, and the rest is Mg). Two-stage homogenization annealing is carried out on the ingot, and the annealing process is as follows: 12 hours at 270°C, and then the temperature is raised to 400°C for 30 hours. After the ingot is kept at 400~410℃ for 14 hours, it is subjected to upsetting multi-directional temperature-variable forging, and after 3 passes of upsetting and multi-directional deformation, it is returned to the furnace for annealing. The reduction speed of multi-directional forging is 200-400mm / min, the reduction of upsetting pass is 30-35%, the reduction of elongating pass is 5-8%, and the temperature of upper and lower cutting boards is 240-250°C. The ingot is subjected to multi-directio...

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Abstract

The invention relates to a process for forming a moderately-strong heat-resisting magnesium alloy die-forged piece. Magnesium alloy comprises, by mass, 7.5%-9.0% of Al, 0.02%-0.80% of Ag, 0.35%-0.55% of Zn, 0.05%-0.20% of Mn, 0.1%-0.10% of RE and 0.001%-0.020% of Ca, the balance of Mg and impurity elements which can not be removed. The method includes the steps that an alloy ingot is formed through semicontinuous casting; the ingot is subjected to double-stage homogenizing annealing; the ingot is subjected to multidirectional variable-temperature forging at the temperature ranging from 350 DEG C to 410 DEG C after being subjected to annealing, and the annealing temperature is reduced by 10 DEG C to 20 DEG C after each time of annealing deformation; the ingot is subjected to isothermal forging at the temperature ranging from 350 DEG C to 400 DEG C after being subjected to multidirectional variable-temperature forging; aging of the die-forged piece is carried out and lasts for 20 hours to 30 hours at the temperature ranging from 170 DEG C to 200 DEG C. The magnesium alloy die-forged piece manufactured through the method is larger than or equal to 360 MPa in tensile strength, larger than or equal to 255 MPa in yield strength and larger than or equal to 7% in elongation percentage at an indoor temperature after the aging process.

Description

Technical field [0001] The invention involves the field of magnesium alloy forging, and it is specific to the field of MG-Al-AG magnesium alloy model forging and forging for forging and forging forging. Background technique [0002] Magnesium alloys have the advantages of low density, high strength and high stiffness, damping shock absorption performance and good electromagnetic shielding performance, rich resources, etc., and have broad application prospects in the fields of aerospace, transportation, electronic information.Magnesium alloy is used in the field of aerospace, which can greatly improve the vehicle capacity of the aircraft.Therefore, vigorously studying and developing magnesium alloy processing and application technology has a profound strategic significance for giving full play to the advantages of my country's magnesium resources and improving my country's international status.At present, the processing and preparation of large -sized high -performance magnesium a...

Claims

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Application Information

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IPC IPC(8): B23P23/04B21J5/02B21J5/08B21K29/00
CPCB21J5/002B21J5/02B21J5/08C22C23/02C22F1/06
Inventor 刘楚明孙伟兵雷义民芦玉波易幼平杨续跃
Owner CENT SOUTH UNIV
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