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Magnesium alloy rotary body structural part and preparation process thereof

A preparation process and technology of gyratory bodies, applied in the field of magnesium alloys, can solve problems such as poor structure uniformity of forgings, uneven metal flow, and low local mechanical properties, and achieve the effects of ensuring uniform plastic flow, improving mechanical properties, and reducing the risk of cracking

Pending Publication Date: 2022-04-19
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloy is formed by single die forging, the metal flow is not uniform, the forging structure uniformity is poor, and the local mechanical properties are low.
In addition, magnesium-lithium alloys are very sensitive to heat treatment process parameters, the strengthening phase in the structure is unstable, and forgings are prone to overaging, resulting in strength attenuation

Method used

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  • Magnesium alloy rotary body structural part and preparation process thereof
  • Magnesium alloy rotary body structural part and preparation process thereof
  • Magnesium alloy rotary body structural part and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mg-10.2Li-3.1Al-2.8Zn (wt.%) magnesium-lithium alloy vacuum smelted casting ingot is turned into a forged billet with a diameter of 290mm and a length of 500mm;

[0031] The forging billet is heated to 270°C with the furnace, and after 6 hours of heat preservation, the billet is opened for multi-directional large deformation forging. Upsetting 10%, after flattening the two ends, then pulling out, during the process, the forging billet is reversed once, after forging, it is air-cooled to room temperature, and the diameter of the forging is 195mm, and the length is 1060mm, such as figure 1 shown;

[0032] The forgings are sawed according to the length of 200mm to obtain multiple ingots. The ingots are heated with the furnace to 220°C for 5 hours, the mold is preheated to 220°C, and the die forging is formed once. The speed of die forging is 4mm / s, and the reduction is 95%. The die forgings are then demolded immediately and air cooled to room temperature;

[0033] The di...

Embodiment 2

[0035] Mg-9.8Li-3.3Al-2.6Zn (wt.%) magnesium-lithium alloy vacuum smelted casting ingots were turned and blanked to obtain a forged billet with a diameter of 260 mm and a length of 480 mm;

[0036]The forging billet is heated to 270°C with the furnace, and after holding for 6 hours, multi-directional large deformation forging is carried out. Upsetting 13%, after flattening the two ends, then pulling out, the forging billet is reversed once during the process, after forging, it is air-cooled to room temperature, and the diameter of the forging is 190mm, and the length is 870mm;

[0037] The forging is sawed according to the length of 195mm to obtain multiple ingots. The ingots are heated with the furnace to 240°C for 5 hours, the mold is preheated to 200°C, and the die forging is formed once. The die forging reduction speed is 6mm / s and the reduction is 94.9%. The die forgings are then demolded immediately and air cooled to room temperature;

[0038] The die forgings were subj...

Embodiment 3

[0040] Mg-11.3Li-2.8Al-3.5Zn (wt.%) magnesium-lithium alloy vacuum smelted casting ingots were turned and blanked to obtain a forged billet with a diameter of 255 mm and a length of 520 mm;

[0041] The forging billet is heated to 300°C with the furnace, and after 6 hours of heat preservation, multi-directional large deformation forging is carried out to open the billet. Upsetting 16%, after flattening the two ends, then elongating, the forging billet is reversed once during the process, after forging, it is air-cooled to room temperature, and the diameter of the forging is 180mm, and the length is 1010mm;

[0042] The forging is sawed according to the length of 240mm to obtain multiple ingots. The ingots are heated with the furnace to 290°C for 5 hours, the mold is preheated to 220°C, and the die forging is formed once. The die forging reduction speed is 9mm / s and the reduction amount is 95.8%. The die forgings are then demolded immediately and air cooled to room temperature;...

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Abstract

The preparation technology comprises the following steps that S1, a magnesium-lithium alloy cast ingot is subjected to skin turning and blanking, and a forging stock is obtained; s2, after the forging stock is heated and subjected to heat preservation, multidirectional forging cogging is conducted, air cooling is conducted to the room temperature after forging, and a forge piece with the length-diameter ratio being 3.5-7.0 is obtained; s3, the forge piece is sawn to obtain a plurality of ingot blanks, after the ingot blanks are heated and subjected to heat preservation, die forging forming is carried out, the die forging pressing speed is 2-10 mm / s, a die forging piece of a rotary body structure is obtained through die forging forming, the die forging piece is demoulded, and air cooling is carried out to the room temperature after demoulding; and S4, aging heat treatment is conducted on the die forging after demolding, and the die forging is cooled to the room temperature. According to the preparation technology, the alloy is subjected to severe plastic deformation through the multi-directional forging and die forging composite technology, the dislocation density in the structure is high, and the deformation strengthening effect is remarkable; and meanwhile, short-time aging treatment and rapid cooling are adopted, so that deformation strengthening and second-phase strengthening are combined, the mechanical property of the die forging is greatly improved, and the yield is effectively increased.

Description

technical field [0001] The invention belongs to the field of magnesium alloys, and in particular relates to a magnesium alloy revolving body structural part and a preparation process thereof. Background technique [0002] Magnesium-lithium alloy is the lightest metal structure material in practical application, its density is only 1.35-1.65g / cm 3 , 1 / 4-1 / 3 lighter than common Mg-Al-Zn, Mg-Zn-Zr and Mg-RE series alloys, 1 / 3-1 / 2 lighter than aluminum alloys, known as ultra-light alloys. At the same time, magnesium-lithium alloy has the advantages of high specific strength and rigidity, good processing plasticity, and excellent electromagnetic shielding effect. It has become an ideal lightweight structural material in the fields of aerospace, national defense and 3C. With the rapid development of my country's aerospace technology, ultra-lightweight equipment has become an important trend. Reducing the structural quality of equipment, thereby increasing the amount of fuel and p...

Claims

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Application Information

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IPC IPC(8): B21J1/00B21J5/02B21J5/00C21D9/00
CPCB21J1/00B21J5/025B21J5/002C21D9/00Y02E60/10
Inventor 曾钢肖宏超康心锴王明旭王杜宇
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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