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A method to improve the strength and strain fatigue life of aq80m magnesium alloy

A fatigue life, magnesium alloy technology, applied in the field of improving the strength and strain fatigue life of magnesium alloys, can solve the problems of low strength, reduce plasticity and fatigue performance, etc., achieve large plastic deformation, improve formability, and uniform structure Effect

Active Publication Date: 2020-03-17
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

[0006] The purpose of the present invention is to provide a method for comprehensively improving the strength and strain fatigue performance of the AQ80M wrought magnesium alloy in view of the technical deficiencies that the Mg-Al-Zn series magnesium alloy has low strength and the conventional strengthening method greatly reduces the plasticity and fatigue performance

Method used

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  • A method to improve the strength and strain fatigue life of aq80m magnesium alloy
  • A method to improve the strength and strain fatigue life of aq80m magnesium alloy
  • A method to improve the strength and strain fatigue life of aq80m magnesium alloy

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Embodiment 1

[0028] Semi-continuously cast AQ80M magnesium alloy ingots were air-cooled to room temperature after 250°C / 10h + 420°C / 40h double-stage homogenization treatment, and processed into rectangular parallelepiped samples by car descaling. Before multi-directional forging, put the ingot into the annealing furnace and heat it at 410°C for 4 hours, heat the upper and lower flat anvils to 300°C, and perform one-fire forging on the cuboid sample on the hydraulic press: take the length of the sample as Z, and the rest The two directions are arbitrary Y and X directions, and the compression is carried out in the order of Z-Y-X-Z-Y-X. The reduction speed is 200-400 mm / min, and the reduction amount per pass is 15%-25%. Cut the forging billet into 40 mm × 80 mm × 180 mm plates, hold it at 400 °C for 2.5 h, and roll it for 6 passes with twin rolls. The rolls are preheated to 200 °C in advance, and the reduction in each pass is 10%-20% , and return to the furnace for annealing between each pas...

Embodiment 2

[0030]Semi-continuously cast AQ80M magnesium alloy ingots were air-cooled to room temperature after 250°C / 10h + 420°C / 40h double-stage homogenization treatment, and processed into rectangular parallelepiped samples by car descaling. Before multi-directional forging, put the ingot into the annealing furnace and heat it at 400°C for 4 hours, heat the upper and lower flat anvils to 280°C, and perform one-fire forging on the cuboid sample on the hydraulic press: take the length of the sample as Z, and the rest The two directions are arbitrary Y and X directions, and the compression is carried out in the order of Z-Y-X-Z-Y-X. The reduction speed is 200-400 mm / min, and the reduction amount per pass is 15%-25%. Cut the forging billet into 40 mm × 80 mm × 180 mm plates, hold it at 410 °C for 2 h, and double-roll rolling for 6 passes. The rolls are preheated to 200 °C in advance, and the reduction in each pass is 10% to 20%. , annealing in the furnace between each pass, the annealing t...

Embodiment 3

[0032] Semi-continuously cast AQ80M magnesium alloy ingots were air-cooled to room temperature after 250°C / 10h + 420°C / 40h double-stage homogenization treatment, and processed into rectangular parallelepiped samples by car descaling. Before multi-directional forging, put the ingot into the annealing furnace and heat it at 400°C for 4 hours, heat the upper and lower flat anvils to 280°C, and perform one-fire forging on the cuboid sample on the hydraulic press: take the length of the sample as Z, and the rest The two directions are arbitrary Y and X directions, and the compression is carried out in the order of Z-Y-X-Z-Y-X. The reduction speed is 200-400 mm / min, and the reduction amount per pass is 15%-25%. The forging billet was cut into 40 mm × 80 mm × 180 mm plates, held at 410 °C for 2.5 h, and rolled by twin rolls for 6 passes, the rolls were preheated to 200 °C in advance, and the reduction in each pass was 10% to 20% , annealing in the furnace between each pass, the annea...

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Abstract

Disclosed is a method for improving strength of an AQ80M magnesium alloy and prolonging strain fatigue life thereof, comprising the following steps: performing homogeneous annealing on an AQ80M semi-continuous casting ingot blank, and then performing multi-directional hammer cogging; and performing primary rolling on an obtained forging blank at the high temperature of 380-430°C, and then reducing the temperature to 150-330°C, and performing finish-rolling forming. According to the method, the high-temperature plastic advantage of the AQ80M magnesium alloy is fully played, so that the forming property of the alloy is improved, and substantial reduction of material plasticity and fatigue performance due to dynamic precipitation is avoided. Moreover, the finish-rolling temperature is reduced by rapid cooling, grains can be effectively refined, the material strength is improved, and the strain fatigue life is prolonged. The operation process is simple and practicable, and a prepared AQ80M magnesium alloy board has the yield strength of higher than or equal to 280 MPa and the tensile strength of higher than or equal to 350 MPa, the fatigue life is 10 4 times or more when the additional total strain amplitude is 0.3%, and the fatigue life is 2200 times or more when the additional total strain amplitude is 0.5%.

Description

technical field [0001] The invention relates to a method for improving the strength and strain fatigue life of a magnesium alloy, in particular to a method for improving the strength and fatigue performance of an AQ80M magnesium alloy through a composite process of multi-directional forging and cooling rolling, and belongs to the technical field of magnesium alloy deformation processing . Background technique [0002] Compared with traditional metal structural materials, magnesium alloy has large reserves, low density (about 2 / 3 of aluminum, 1 / 4 of iron), high specific strength and specific stiffness, good electromagnetic shielding performance and shock resistance and noise reduction performance, and Easy to recycle and pollution-free, known as "green engineering materials in the 21st century". Due to these outstanding advantages, magnesium alloys have important application value and broad application prospects in the fields of transportation, aerospace, national defense an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02
CPCC22C23/02C22F1/06
Inventor 刘楚明毛隆辉万迎春蒋树农高永浩
Owner 湖南镁宇科技有限公司
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