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Extrusion and forging integrated forming process of large diameter aq80m magnesium alloy cake

A forming process, magnesium alloy technology, applied in the direction of metal extrusion, metal processing equipment, metal extrusion control equipment, etc., can solve the problems of reduced mechanical properties, large total deformation, easy cracking of ingots, etc., to reduce intermediate The effect of the number of annealing

Active Publication Date: 2018-08-21
湖南镁宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the pre-deformed ingot is only subjected to homogenization treatment, the grain size of the alloy is relatively large, and various defects generated during the casting process are difficult to eliminate, so the ingot is easy to crack in the subsequent forging forming process
[0005] (2) During the forging process, the total deformation of the high upward direction is large (≥80%), and the deformation parameters need to be set reasonably. Excessive deformation or low deformation temperature will easily lead to cracking of the ingot, and multiple small deformations The forming process requires multiple intermediate anneals, which can easily lead to grain growth and reduce mechanical properties

Method used

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  • Extrusion and forging integrated forming process of large diameter aq80m magnesium alloy cake
  • Extrusion and forging integrated forming process of large diameter aq80m magnesium alloy cake

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Magnesium alloy ingots with a diameter of Φ610mm and a length of 1650mm were prepared by semi-continuous casting, homogenized, air-cooled to room temperature, and descaled. Heat the extrusion die and keep the temperature at 360°C; heat the extrusion barrel and keep the temperature at 370°C; heat the billet to 420°C for 1 hour, and then carry out low extrusion ratio extrusion billet opening. The extrusion ratio is 3.6, and the extrusion speed is 1.2mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. The bars were cut into long 630mm bars. After the rod-shaped blank is kept at 410°C for 1 hour, it is thickened and compressed on a hydraulic press. The reduction of the forging pass is 10-25%, and the intermediate annealing is carried out for 6 passes to obtain a magnesium alloy with a diameter of Φ695mm and a height of 110mm. Cake material, 175℃ / 36h aging treatment. physical map see figure 1 , and its mechanical properties are shown in Table (1).

Embodiment 2

[0030] A magnesium alloy ingot with a diameter of Φ620mm and a length of 1600mm was prepared by semi-continuous casting, homogenized, air-cooled to room temperature, and descaled. Heat the extrusion die and keep the temperature at 390°C; heat the extrusion barrel and keep the temperature at 400°C; heat the ingot to 380°C for 1.5 hours, and then carry out low extrusion ratio extrusion. The extrusion ratio is 4, and the extrusion speed is 2mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. The bars were cut into long 630mm bars. After the rod-shaped blank is kept at 415°C for 1 hour, it is thickened and compressed on a hydraulic press. The reduction of the forging pass is 15-30%, and the intermediate annealing is carried out for 5 passes to obtain a magnesium alloy with a diameter of Φ700mm and a height of 100mm. Cake material, 175℃ / 36h aging treatment. Its mechanical properties are shown in Table (1).

Embodiment 3

[0032] A magnesium alloy ingot with a diameter of Φ610mm and a length of 1650mm was prepared by semi-continuous casting, homogenized, air-cooled to room temperature, and descaled. Heat the extrusion die and keep the temperature at 360°C; heat the extrusion barrel and keep the temperature at 370°C; heat the ingot to 360°C and keep it for 2 hours, then perform low extrusion ratio extrusion to open the billet. The extrusion ratio is 3.6, and the extrusion speed is 1.6mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. The bars were cut into long 630mm bars. After the rod-shaped blank is kept at 400°C for 1 hour, it is thickened and compressed on a hydraulic press. The reduction of the forging pass is 15-20%, and the intermediate annealing is carried out for 5 passes to obtain a magnesium alloy with a diameter of Φ700mm and a height of 100mm. Cake material, 175℃ / 36h aging treatment. Its mechanical properties are shown in Table (1)

[0033] Table (1) Mechanical ...

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Abstract

The invention relates to a swaging integrated forming process for a large-diameter AQ80M magnesium alloy cake material, and belongs to the technical field of processing of a magnesium alloy material. The process comprises the following specific steps: preparing an AQ80M magnesium alloy ingot blank by semi-continuous casting; heating an extrusion die and an extrusion barrel; carrying out extrusion pre-deformation at low extrusion ratio; straightening and cutting the blank; carrying out multi-directional forging forming; and carrying out aging treatment. By the swaging integrated forming process for the large-diameter AQ80M magnesium alloy cake material, the large-diameter magnesium alloy cake material of which the diameter is phi 690 mm to phi 700 mm, the thickness is 100-110 mm, the tensile strength is greater than or equal to 330 MPa, the yield strength is greater than or equal to 190 MPa and the ductility is greater than or equal to 6% at room temperature, and the tensile strength is greater than or equal to 200 MPa, the yield strength is greater than or equal to 160 MPa and the ductility is greater than or equal to 30% at the temperature of 150 DEG C. The prepared large-size magnesium alloy cake material completely meets requirements of a large magnesium alloy part.

Description

technical field [0001] The invention relates to an extrusion forging integrated forming process of a large-diameter AQ80M magnesium alloy cake material, belonging to the technical field of magnesium alloy material processing. Background technique [0002] With the rapid development of the aerospace field, material weight reduction has become an urgent requirement in this field. Magnesium alloy is the lowest density metal structure material and has great development potential in the field of aerospace. However, due to problems such as poor heat resistance and poor plastic deformation ability, the current application of magnesium alloys, especially in large-scale parts, lags far behind steel and aluminum alloys. [0003] AQ80M magnesium alloy is a new low-cost heat-resistant alloy with excellent room temperature and high temperature mechanical properties. If it is used to replace steel and aluminum alloy, it can play a significant role in weight reduction. At present, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02B21C31/00B21J5/08B21J5/00C22C23/02C22F1/06
CPCB21C31/00B21C37/02B21J5/002B21J5/08C22C23/02C22F1/06
Inventor 刘楚明许诗源蒋树农高永浩曾钢
Owner 湖南镁宇科技有限公司
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