High-strength magnesium alloy extruded seamless tube and making technology thereof

A seamless pipe and preparation process technology, applied in the metal material processing technology and metallurgy field, can solve the problems of poor structure density, cracking or fracture, low strength fatigue strength, etc., and achieve high tensile and yield strength, high utilization rate, Good service performance

Active Publication Date: 2014-03-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Based on the existing literature reports, it is found that the existing extruded magnesium alloy pipes are generally extruded through a split die, and there are extruded metallurgical welds inside the pipes. The structure is poor in compactness, and the strength, especially the fatigue strength Low; in the actual use process, this position is the weak point of the pipe, which is easy to cause cracking or breaking

Method used

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  • High-strength magnesium alloy extruded seamless tube and making technology thereof
  • High-strength magnesium alloy extruded seamless tube and making technology thereof
  • High-strength magnesium alloy extruded seamless tube and making technology thereof

Examples

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Embodiment 1

[0041] A cylindrical ingot with a diameter of 270 mm and a height of 380 mm was obtained by metal mold gravity casting. After chemical analysis, its chemical composition is: Mg-9.52Gd-2.88Y-0.31Zr. The alloy ingot was homogenized at 500°C for 16 hours; after the treatment, the ingot was peeled off to obtain an ingot for extrusion. The ingot used for extrusion was kept at 400° C. for 3 hours, put into the extrusion cylinder and carried out a billet extrusion, and obtained a billet with a diameter of 150 mm. The blanked bar stock is further machined into a hollow ingot with a diameter of 145 mm and a hole with a diameter of 45 mm in the center. The hollow ingot was kept at 460°C for 3 hours, extruded by a double-action horizontal extruder with a perforating needle with a diameter of 46 mm, and the diameter of the die hole was 60 mm to obtain a seamless pipe with an outer diameter of 60 mm and an inner diameter of 46 mm. The thickness of the pipe is 7mm and the length is about ...

Embodiment 2

[0043] A cylindrical ingot with a diameter of 270 mm and a height of 400 mm was obtained by metal mold gravity casting. After testing, the chemical composition of the alloy is: Mg-9.25Gd-2.88Y-0.46Zn-0.39Zr. Alloy ingots were homogenized at 500°C for 16 hours; peeled after treatment. The alloy ingot was kept at a temperature of 400°C for 3 hours, put into the extrusion barrel for one billet extrusion, and obtained a primary billet bar with a diameter of 150mm. The blanked bar stock is further machined into a hollow ingot with a diameter of 145 mm and a hole with a diameter of 45 mm in the center. The hollow ingot was kept at 480°C for 3 hours, extruded by a double-action horizontal extruder with a perforating needle with a diameter of 46mm, and the diameter of the die hole was 60mm to obtain a seamless pipe with an outer diameter of 60mm and an inner diameter of 46mm. The thickness of the pipe is 7mm and the length is about 4000mm, such as Figure 5 . The seamless pipe obt...

Embodiment 3

[0045] A cylindrical ingot with a diameter of 270 mm and a height of 420 mm was obtained by metal mold gravity casting. After testing, the chemical composition of the alloy is: Mg-9.04Gd-1.91Y-0.97Zn-0.32Zr. The alloy ingot was homogenized at 520°C for 10 hours; after the treatment, the ingot was peeled off to obtain an alloy ingot. The alloy billet was kept at 420° C. for 5 hours, put into the extrusion cylinder for one-time billet extrusion, and obtained a first-time billet billet with a diameter of 125 mm. The primary billet billet is further machined into a hollow billet for extrusion of a seamless pipe with a diameter of 120 mm and a hole in the center with a diameter of 50 mm. After the hollow ingot is kept at 440°C for 3 hours, it is extruded by a double-acting horizontal extruder with a perforating needle with a diameter of 46mm. The diameter of the die hole is 68mm to obtain a seamless pipe with an outer diameter of 68mm and an inner diameter of 46mm, the thickness ...

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Abstract

The invention discloses a high-strength magnesium alloy extruded seamless tube and a making technology thereof, and belongs to the fields of metal material processing technologies and metallurgical technologies. The alloy components of the tube comprise, by mass, 8.0-10.0% of Gd, 1.0-3.0% of Y, 0-1.0% of Zn, 0.1-0.7% of Zr, and the balance Mg. The making technology comprises the following steps: carrying out cogging extrusion after preprocessing an alloy ingot obtained after smelting the above components in order to form a rod, punching the cogged rod, carrying out secondary extrusion on a double-action extruder with a hole forming pin to form a seamless tube, and carrying out optimized subsequent heat treatment to obtain the high-strength magnesium alloy extruded seamless tube. The obtained tube has no extrusion welding welds in the circumference direction, has a good microstructure uniformity, and has an excellent fatigue resistance. The mechanical performances of the tube produced in the invention are obviously better than that of existing commercial grades of magnesium alloy tubes.

Description

technical field [0001] The invention belongs to the fields of metal material processing technology and metallurgy technology, and in particular relates to a high-strength magnesium alloy extruded seamless pipe and a preparation process thereof. Background technique [0002] As a new type of lightweight metal material, magnesium alloy has a series of advantages such as low density, high specific strength, impact resistance, and recyclability. It has broad application prospects in transportation, aviation, aerospace, 3C and other industries. It is expected to become the third largest metal structural material after steel and aluminum alloy. So far, most of the magnesium alloy products in the world are produced by casting methods, especially die casting. Magnesium alloys generally have higher strength and ductility after deformation, and are suitable for manufacturing parts that bear heavy loads; moreover, more diverse product forms and mechanical properties can be obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06B21C23/08C21D8/10
Inventor 陈荣石唐伟能韩恩厚柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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