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A Forging Process to Eliminate Anisotropy of Large Size AQ80M Magnesium Alloy Bearing Members

An anisotropic, load-bearing member technology, applied in the field of forging technology, can solve the problems of high technical difficulty, complex process, inability to produce large-scale bulk materials, etc., to increase the number of intermediate annealing, inhibit the growth of grains, The effect of increasing the risk of ingot cracking

Active Publication Date: 2018-10-16
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

[0003] At present, there are a variety of processes to eliminate the anisotropy of magnesium alloys at home and abroad, such as asynchronous rolling, equal angle rolling, cross rolling and unidirectional repeated bending deformation, etc., but these methods are relatively complicated and technically difficult. High, unable to produce large-scale bulk materials

Method used

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  • A Forging Process to Eliminate Anisotropy of Large Size AQ80M Magnesium Alloy Bearing Members

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A magnesium alloy ingot with a diameter of Φ610 and a length of 1630 mm was prepared by semi-continuous casting, homogenized, air-cooled to room temperature, and descaled. The extrusion die is heated and the temperature is maintained at 360°C; the extrusion barrel is heated and the temperature is maintained at 370°C. After the billet was heated to 360°C for 1 hour, the billet was extruded with an extrusion ratio of 3.6 and an extrusion speed of 1.6mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. After the extruded rod-shaped billet is kept at 410°C for 8 hours, multi-directional forging is carried out on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 5-30%; every 8 passes are returned to the furnace for annealing , the annealing temperature was 410°C, the annealing time was 0.5h, and finally a magnesium alloy bearing part with a length of 475mm, a width of 390mm, and a height of 170mm was forged, and...

Embodiment 2

[0021] 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. The extrusion die is heated and the temperature is maintained at 360°C; the extrusion barrel is heated and the temperature is maintained at 370°C. After heating the ingot to 360°C for 1 hour, the billet was extruded, the extrusion ratio was 3.6, and the extrusion speed was 1.2mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. After the extruded rod-shaped billet is kept at 400°C for 8 hours, it is upsetting and drawing multi-directional forging on a hydraulic press. The reduction is 5-10%, and the temperature of the upper and lower cutting boards is 150-200°C; the furnace is annealed every 6 times, the annealing temperature is 400°C, and the annealing time is 1h, and finally a magnesium alloy bearing with a length of 470mm, a width of 390mm, and a height of 170mm is forged. pieces,...

Embodiment 3

[0023] 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. The extrusion die is heated and the temperature is maintained at 360°C; the extrusion barrel is heated and the temperature is maintained at 370°C. After heating the ingot to 360°C for 1 hour, the billet was extruded, the extrusion ratio was 4, and the extrusion speed was 2.0mm / s. After extrusion, a rod with a diameter of Φ300mm is obtained. After the extruded rod-shaped billet is kept at 400°C for 8 hours, it is upsetting and drawing multi-directional forging on a hydraulic press. The reduction is 5-10%, the temperature of the upper and lower cutting boards is 150-200°C; the furnace is annealed every 6 times, the annealing temperature is 410°C, and the annealing time is 1h, and finally forged a magnesium alloy bearing with a length of 470mm, a width of 395mm, and a height of 175mm. pieces, aging tr...

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Abstract

The invention relates to a forging process for eliminating anisotropism of a large-sized AQ80M magnesium alloy bearing member and belongs to the technical field of magnesium alloy material machining. The process specifically includes the steps that an ingot blank is prepared; extrusion blooming is performed with the low extrusion ratio, specifically, extrusion is performed on an extruding machine with the extrusion ratio being 3-4 and the extrusion speed being 0.3-2.8 mm / s; cooperating with intermediate annealing, multiple passes of direction-changing heading are performed on a hydraulic press so that the blank can be forged into a large-sized magnesium alloy bearing member; and the magnesium alloy bearing member is subjected to aging treatment. By means of the forging process, preparation of magnesium alloy bearing members with the size being larger than 470*390*170 mm<3> can be achieved; after aging treatment is finished, the yield strength difference among the length direction, the width direction and the height direction is smaller than or equal to 10 MPa at both the room temperature and the temperature of 150 DEG C; and the problem of anisotropism of large-sized magnesium alloy parts is solved.

Description

technical field [0001] The invention relates to a forging process for eliminating the anisotropy of a large-scale AQ80M magnesium alloy bearing component, belonging to the technical field of magnesium alloy material processing. technical background [0002] As a new type of medium-strength heat-resistant magnesium alloy, AQ80M magnesium alloy has the advantages of low cost and excellent high temperature performance, and has a good development prospect in the aerospace field. As the AQ80M magnesium alloy with a close-packed hexagonal structure, it will form a strong deformation texture after deformation. The existence of this deformation texture leads to obvious anisotropy of mechanical properties in the product, which reduces the secondary processing performance of the alloy and limits the AQ80M. Applications of magnesium alloys. Therefore, in order to obtain AQ80M magnesium alloy components with uniform mechanical properties, it is extremely necessary to propose a method t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22F1/06
CPCC22C23/02C22F1/06
Inventor 蒋树农许诗源刘楚明高永浩曾钢
Owner 湖南镁宇科技有限公司
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