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Forging method of high-strength heatproof magnesium alloy

A magnesium alloy, heat-resistant technology, applied in the hot deformation of heat-resistant magnesium alloy, Mg-Gd-Y series magnesium alloy high temperature forging deformation field

Active Publication Date: 2012-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Mg-Re-Zr, Mg-Gd-Y-Zr has outstanding performance, and there are many research reports, most of which focus on extrusion, rolling and other deformations, and no research has been done on its forging deformation

Method used

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  • Forging method of high-strength heatproof magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 : One-way forging

[0024] In this embodiment, a semi-continuous casting method is used to prepare a magnesium alloy ingot, which is homogenized. Heat the billet to 500°C for 2h. Heating the upper and lower flat anvils, the temperature is 520°C. One-way forging is then performed on a hydraulic press. During the forging process, evenly spread graphite powder on the surface of the upper and lower flat anvils as a lubricant. The no-load speed of the hydraulic press is 8mm / s. Depression ≥ 70%. Aging after forging, the aging process is 200 ° C for 72 hours. The mechanical properties after forging, the mechanical properties after aging and the mechanical properties at 250°C are shown in Table (1)

Embodiment 2

[0025] Example 2 : two-way forging

[0026] In this embodiment, a semi-continuous casting method is used to prepare a magnesium alloy ingot, which is homogenized. Heat the blank to 450°C for 2h. Heating the upper and lower flat anvils, the temperature is 470°C. Two-way forging is then performed on a hydraulic press. The pass reduction is 40% to 60%, annealed after 2 to 3 passes, the annealing temperature is 450°C, the annealing time is 0.5h, and the cumulative forging is 12 passes. The original size of the billet is that graphite powder is evenly sprinkled on the upper and lower flat anvil surfaces during the forging process as a lubricant, and the no-load speed of the hydraulic press is 8mm / s. Aging after forging, the aging process is 200 ° C for 72 hours. The mechanical properties after forging, the mechanical properties after aging and the mechanical properties at 250°C are shown in Table (1)

Embodiment 3

[0027] Example 3 : Three-way forging

[0028] In this embodiment, a semi-continuous casting method is used to prepare a magnesium alloy ingot, which is homogenized. Heat the billet to 530°C for 3h. Heating the upper and lower flat anvils, the temperature is 550°C. Then carry out three-way forging on the hydraulic press, the pass reduction is 40% to 60%, annealing after 2 to 3 passes, the annealing temperature is 530°C, the annealing time is 1h, and the cumulative forging is 18 passes. During the forging process, evenly spread graphite powder on the surface of the upper and lower flat anvils as a lubricant. The no-load speed of the hydraulic press is 8mm / s. Aging after forging, the aging process is 200 ° C for 72 hours. The mechanical properties after forging, the mechanical properties after aging and the mechanical properties at 250°C are shown in Table (1)

[0029] Table (1) Mechanical properties of magnesium alloy after forging

[0030]

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Abstract

The patent discloses a forging method of a high-strength heatproof magnesium alloy, specifically comprising the following steps of: preparing a blank material; heating the blank material and keeping warm; heating upper and lower flat anvils; carrying out multiple forging treatments on a hydraulic press with the cooperation of an intermediate annealing process; and carrying out aging treatment after forging. The forged magnesium alloy has advantages of uniform microstructure, fine crystal grains and excellent mechanical properties. After aging treatment, the tensile strength at normal temperature is greater than or equal to 450 MPa, the yield strength is greater than or equal to 410 MPa, and the elongation percentage is greater than or equal to 3%; at the temperature of 250 DEG C, the tensile strength is greater than or equal to 320 MPa and the elongation percentage is greater than or equal to 12%. By the adoption of the method provided by the invention, high temperature plasticity of the magnesium alloy is fully performed, and the service performance of the magnesium alloy is remarkably improved.

Description

[0001] technical field [0002] The invention relates to the field of thermal deformation of heat-resistant magnesium alloys, in particular to the field of high-temperature forging deformation of Mg-Gd-Y series magnesium alloys. Background technique [0003] Magnesium alloy is the metal with the lowest density among practical metals. It has the characteristics of high specific strength, good specific stiffness, and good shock resistance and noise reduction performance. It is an ideal metal structural material. At present, magnesium alloy products are mainly die castings, and high-performance forgings are rarely used. The main reason is that magnesium alloy has poor plasticity at room temperature, is sensitive to deformation rate, and is difficult to forge. The crystal structure of magnesium alloy is close-packed hexagonal, there are few slip systems that can be activated at room temperature, and the plastic deformation ability is poor. The strain state of free forging is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22F1/06
Inventor 刘楚明肖宏超万迎春舒心邹利民
Owner CENT SOUTH UNIV
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