A method for improving long-term service life of magnesium alloys by baking

A service life, magnesium alloy technology, applied in the field of non-ferrous metal material processing, can solve the problems of long aging treatment time, increased density of magnesium alloys, reduced production efficiency, etc., to achieve the effect of low cost, improved yield strength, and improved production efficiency

Active Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of this high-alloyed magnesium alloy is not stable under long-term service conditions: as the service temperature rises, the precipitates coarsen and soften, which is not effective in hindering dislocation movement; the supersaturated solid solution will also appear under external stress. Selective distribution and stress concentration of no-precipitation zone, which will lead to the early appearance and accelerated growth of cracks
On the other hand, the addition of a large amount of rare earth elements usually increases the density of the magnesium alloy, and the aging treatment time is longer, which reduces the production efficiency and increases the cost

Method used

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  • A method for improving long-term service life of magnesium alloys by baking
  • A method for improving long-term service life of magnesium alloys by baking
  • A method for improving long-term service life of magnesium alloys by baking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the raw material is Mg-0.6Ca-0.9Zn ingot (mass percentage), the Ca / Zn mass ratio is 0.67, and a plate with a thickness of 15 mm is obtained by hot rolling. After solution treatment, the plate was pre-deformed at room temperature with a true strain of 0.03, then baked at 220°C for 60 minutes, and quenched in water. The compression performance test is carried out on the baked sample at 200°C to obtain its yield strength; the compression fatigue and creep performance tests are respectively carried out under the preset service conditions of 200°C and 100MPa, and the number and time of fracture are respectively recorded For fatigue and creep life, and compared with the samples without baking treatment, the results are shown in Table 1.

[0025] Table 1

[0026]

[0027] It can be seen from Table 1 that the compressive yield strength of the baked magnesium alloy is 130MPa at 200°C, which is about 53.8% higher than that of the unbaked sample of 90MPa. ...

Embodiment 2

[0029] In this embodiment, the raw material is Mg-0.2Ca-0.2Zn ingot (mass percentage), the Ca / Zn mass ratio is 1, and a plate with a thickness of 2 mm is obtained by hot extrusion. After solution treatment, the plate is pre-deformed at room temperature with a true strain of 0.07, then baked at 150°C for 120 minutes, and quenched in water. The tensile properties of the baked samples were tested at room temperature to obtain their yield strength. Tensile fatigue performance test is carried out under the preset room temperature and service conditions of 80MPa, and the number of times when fracture occurs is recorded as the fatigue life; tensile creep performance test is carried out at a preset temperature of 300°C and 30MPa, and the time when fracture occurs is recorded is the creep life. And compared with the sample without baking treatment, the results are shown in Table 2.

[0030] Table 2

[0031]

[0032] It can be seen from Table 2 that the tensile yield strength of t...

Embodiment 3

[0034] In this embodiment, the raw material is Mg-0.65Ca-0.6Si ingot (mass percentage), the Ca / Zn mass ratio is 1.08, and hot rolling is used to obtain a plate with a thickness of 20 mm. After solution treatment, the plate is pre-deformed at room temperature with a true strain of 0.02, then baked at 220°C for 30 minutes, and quenched in water. The compressive performance test was carried out on the baked samples at room temperature to obtain their yield strength. The compression fatigue performance test is carried out under the preset room temperature and 100MPa service conditions, and the number of times when the fracture occurs is recorded as the fatigue life; the compression creep performance test is carried out at the preset 220°C and 100MPa, and the time when the fracture occurs is recorded as the creep Change life. And compared with the sample without baking treatment, the results are shown in Table 3.

[0035] table 3

[0036]

[0037] It can be seen from Table 3 ...

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Abstract

The invention discloses a method for prolonging the long-time service life of a magnesium alloy through drying. The magnesium alloy comprises, by mass, 0.1-0.65% of calcium, 0.05-1.2% of zinc and thebalance magnesium, and the mass percentage ratio of calcium to zinc is greater than or equal to 0.4; or comprises, by mass, 0.1-0.65% of calcium, 0.05-0.6 % of silicon and the balance magnesium, and the mass percentage ratio of calcium to silicon is greater than or equal to 0.9. The method comprises the steps of preparing a magnesium alloy ingot blank through a semicontinuous casting method, conducting hot rolling or hot extrusion on the magnesium alloy ingot blank to form a plate with the thickness of 2-20 mm, conducting solution treatment on the plate, conducting cold deformation on the plate at true strain of 0.01-0.07 at indoor temperature, conducting baking on the plate at 150-230 DEG C for 10-120 min and then conducting water quenching. Compared with a magnesium alloy not subjected to baking treatment, the yield strength of the magnesium alloy subjected to baking can be improved by 30% or more, and the fatigue and creep life of the magnesium alloy can be prolonged by at least 5 times under the long-time service conditions.

Description

technical field [0001] The invention relates to a method for improving the long-term service life of magnesium alloys by using baking, and specifically relates to a method for quickly introducing precipitated relative dislocations and pinning of grain boundaries through baking, thereby preparing magnesium alloys with high strength and long service life. magnesium alloy plates. It belongs to the technical field of non-ferrous metal material processing. Background technique [0002] In the environment of energy saving and emission reduction, lightweight has become the trend of the manufacturing industry, and magnesium alloy, as the lightest metal structure material, has the characteristics of low density, good strength and high biocompatibility, making it a new research and development in recent years. Focus and make some progress. The room temperature strength of magnesium alloys currently developed is comparable to that of aluminum alloys, but they are more prone to fatigu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/00C22C23/04
CPCC22C23/00C22C23/04C22F1/06
Inventor 霍庆欢肖振宇杨续跃张至柔
Owner CENT SOUTH UNIV
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