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A kind of preparation method of large size magnesium alloy forged cake

A magnesium alloy and large-scale technology, which is applied in the field of preparing large-scale magnesium alloy forging cakes, can solve the problems of narrow forging temperature range, coarse grains, and adverse effects of magnesium alloys, so as to ensure the microstructure and performance and improve the microstructure. status, the effect of improving organizational resilience

Active Publication Date: 2015-09-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Although billet extrusion can improve the plasticity of magnesium alloys to a certain extent, it is very suitable for small-sized workpieces, but for large-sized workpieces, billet extrusion cannot be deformed with a large extrusion ratio, resulting in its The deformation of the core and the edge is inconsistent, which will have an adverse effect on the subsequent processing, and the process is cumbersome, consumes a lot of energy, and the production efficiency is low;
[0005] (2) As the size of the workpiece increases, the influence of external friction on the upper and lower surfaces becomes larger, and the side of the sample is seriously drum-shaped, so it is easy to form circumferential tensile stress in the drum-shaped area, and it is easy to cause the second phase to remain under the action of tensile stress. The particles and the matrix crack, and then form circumferential surface cracks;
[0006] (3) The forging temperature range of magnesium alloy is narrow (about 150°C), and its thermal conductivity is large, about twice that of steel. When forging, after the forging contacts the mold, the temperature drop of the outer surface is very serious, resulting in a decrease in plasticity , deformation resistance increased;
[0007] (4) When the pier is thick, the pass deformation is generally 25% to 30%. Therefore, for magnesium alloy forgings with complex shapes or large deformations, multiple thermal deformations are required. The greater the total strain, the shorter the deformation pass. The more; repeated reheating will lead to coarse grains, lower performance of forgings, and greater energy loss
[0010] In short, it is difficult to prepare large-size magnesium alloy forging cakes with a diameter greater than or equal to 670mm and superior performance in the existing magnesium alloy forging technology

Method used

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  • A kind of preparation method of large size magnesium alloy forged cake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A magnesium alloy forging cake forging process is based on the diameter D = 300mm, the composition is (wt.%): Al8.2 ~ 8.5; Mn0.2 ~ 0.25; Zn0.4 ~ 0.5; Cu≦0.05; Ni≦0.005 ; Si≦0.15; Be≦0.02; Fe≦0.05; other impurities≦0.3; the balance is Mg, the homogenized magnesium alloy continuous casting ingot is forged into a magnesium alloy forging cake with a diameter of 695mm and a thickness of 105mm; including the following step:

[0052] a. Material flaw detection: Remove surface scale and visible cracks from the continuous casting billet, process it into an ingot with a height of 550mm and a diameter of 300mm, and use ultrasonic waves to detect flaws in the billet to ensure that there are no obvious cracks and shrinkage cavities inside the billet , inclusion defects;

[0053] b. Heating: Heat the ingot without obvious cracks, shrinkage cavities and inclusion defects to 400°C, keep it warm for 6 hours, and heat the hydraulic press mold to 300°C;

[0054] c. Thickness of pier: St...

Embodiment 2

[0060] A magnesium alloy forging cake forging process is based on the diameter D = 325mm, the composition is (wt.%): Al8.2 ~ 8.5; Mn0.2 ~ 0.25; Zn0.4 ~ 0.5; Cu≦0.05; Ni≦0.005 ; Si≦0.15; Be≦0.02; Fe≦0.05; other impurities≦0.3; the balance is Mg, the homogenized magnesium alloy continuous casting ingot is forged into a magnesium alloy forging cake with a diameter of 685mm and a thickness of 110mm; including the following step:

[0061] a. Material flaw detection: Remove surface scale and visible cracks from the continuous casting billet, process it into a billet with a height of 500mm and a diameter of 325mm, and use ultrasonic waves to detect flaws in the billet to ensure that there are no obvious cracks and shrinkage cavities inside the billet , inclusion defects;

[0062] b. Heating: Heat the ingot without obvious cracks, shrinkage cavities and inclusion defects to 420°C, keep it warm for 10h, and heat the hydraulic press mold to 320°C;

[0063] c. Thickness of pier: put th...

Embodiment 3

[0069] A magnesium alloy forging cake forging process is based on the diameter D = 350mm, the composition is (wt.%): Al8.2 ~ 8.5; Mn0.2 ~ 0.25; Zn0.4 ~ 0.5; Cu≦0.05; Ni≦0.005 ; Si≦0.15; Be≦0.02; Fe≦0.05; other impurities≦0.3; the balance is Mg and the homogenized continuous casting ingot is forged into a magnesium alloy forging cake with a diameter of 700mm; including the following steps:

[0070] a. Material flaw detection: Remove surface scale and visible cracks from the continuous casting slab, process it into a billet with a height of 525mm and a diameter of 350mm, and use ultrasonic waves to detect flaws in the billet to ensure that there are no obvious cracks, shrinkage cavities, etc. inside the billet. inclusion defects;

[0071]b. Heating: Heat the ingot without obvious cracks, shrinkage cavities and inclusion defects to 430°C, keep it warm for 10h, and heat the hydraulic press mold to 350°C;

[0072] c. Thickness of the pier: Stand the ingot after heating and heat pr...

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Abstract

The invention relates to a preparation method of a large-sized magnesium alloy forged disc and belongs to the technical field of magnesium alloy materialmachining. The preparation method of the large-sized magnesium alloy forged disc comprises the following steps of heating a casting magnesium alloy ingot to 400-430 DEG C and preserving the heat, wherein the casting magnesium alloy ingot after homogenizing thermal treatment is 300-350mm in diameter and 1.5-1.85 in height-diameter ratio; upsetting and drawing out the heated casting magnesium alloy ingot at 400-430 DEG C to obtain a magnesium alloy forged disc; repeating processes of heating, preserving the heat, upsetting and drawing out till the diameter of the magnesium alloy forged disc is larger than or equal to 670mm to obtain the large-sized magnesium alloy forged disc, wherein the temperature when repeating the procedures of preserving the heat and upsetting every time is 10-20 DEG C lower than the temperature when previously repeating the procedures of preserving the heat and upsetting, the forging ratio in each upsetting procedure is 1.5-2, the forging ratio in each drawing-out procedure is 1.02-1.05, and the deformation speeds in the upsetting and drawing-out procedures both are 12-16mm / s. According to the preparation method of the large-sized magnesium alloy forged disc, which is disclosed by the invention, the large-sized magnesium alloy forged disc with the diameter of 670-720mm, the thickness of 80-120mm, the tensile strength of larger than or equal to 300MPa, the yield strength of larger than or equal to 180Mpa and the elongation percentage of larger than or equal to 10% can be manufactured, and the manufactured large-sized magnesium alloy forged disc can completely meet the requirements on the preparation of a large-sized magnesium alloy die forged piece.

Description

technical field [0001] The invention relates to a method for preparing a large-size magnesium alloy forging cake, belonging to the technical field of magnesium alloy material processing. Background technique [0002] Magnesium alloy has the important advantages of low density and high specific strength, and with the improvement of its smelting and preparation technology, magnesium alloy materials have been widely used in aerospace, automotive industry and electronic 3C and other fields. With the development of the aerospace industry, its demand for magnesium alloys is also increasing, especially for large-sized magnesium alloy parts. Due to the essential characteristics of magnesium alloys with close-packed hexagonal lattice, the plastic deformation ability of magnesium alloys is determined to be poor. Therefore, most of the large-scale magnesium alloys currently used are cast magnesium alloys, but compared with deformed magnesium alloys, cast magnesium alloys have The stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/06C22C23/02C22F1/06
Inventor 李慧中姜俊梁霄鹏欧阳杰李轶黄岚刘楚明
Owner CENT SOUTH UNIV
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