Process for forming medium-strength heat-resistant magnesium alloy thick plate

A forming process, magnesium alloy technology, applied in the field of magnesium alloy deformation processing, forging and extrusion deformation of Mg-Al-Ag alloys, can solve the problem of not obvious effects of grain refinement and performance improvement, not deep deformation, etc. problems, to achieve the effects of small component segregation, high production efficiency and high surface quality

Inactive Publication Date: 2014-05-07
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the extrusion ratio, when extrusion deformation is used to produce large-section magnesium alloy struct

Method used

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  • Process for forming medium-strength heat-resistant magnesium alloy thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A smelting furnace with a capacity of 1 ton is used to melt the raw materials, semi-continuously casting and machining a Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) alloy ingot with a diameter of Ф300mm. Heat the ingot at 410°C for 5 hours, carry out upsetting multi-directional forging on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the reduction of the elongation pass is 5 -10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the billet is lower than 350°C, return to the furnace for annealing, the annealing temperature is 400°C, and the holding time is 3 hours. After annealing, repeat the upsetting and drawing process, and after three times of upsetting and drawing, the ingot pier is thickened to a diameter of Ф400mm. Heat the mold and extrusion barrel to a temperature of 200-300°C, keep the billet at 350°C for ...

Embodiment 2

[0017] Example 2: A smelting furnace with a capacity of 1 ton was used to melt the raw materials, semi-continuously cast and machined a Mg-8.5Al-0.8Ag-0.4Zn-0.1Mn-0.1RE-0.005Ca (wt.%) magnesium alloy billet with a diameter of Ф260mm. Heat the ingot at 400°C for 3 hours, carry out upsetting multi-directional forging on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the reduction of the elongation pass is 5 -10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the billet is lower than 350°C, return to the furnace for annealing, the annealing temperature is 380°C, and the holding time is 1.5h. After annealing, the upsetting process is repeated, and the ingot pier is thickened to a diameter of Ф380mm after four times of upsetting. Heat the mold and extrusion barrel to a temperature of 200-300°C, keep the billet at 340°C for 3 hours, and ex...

Embodiment 3

[0018] Example 3: Using a smelting furnace with a capacity of 1 ton to melt raw materials, semi-continuous casting and machining a Mg-9.0Al-0.6Ag-0.4Zn-0.1Mn-0.1RE-0.02Ca (wt.%) magnesium alloy ingot with a diameter of Ф300mm. Heat the ingot at 410°C for 5 hours, carry out upsetting multi-directional forging on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the reduction of the elongation pass is 5 -10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the ingot is lower than 350°C, return to the furnace for annealing, the annealing temperature is 400°C, and hold for 2 hours. After annealing, repeat the upsetting and drawing process, and after three times of upsetting and drawing, the ingot pier is thickened to a diameter of Ф400mm. Heat the mold and extrusion barrel to a temperature of 200-300°C, keep the billet at 340°C for 3 hours, a...

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Abstract

The invention discloses a process for forming a medium-strength heat-resistant magnesium alloy thick plate with the thickness of 50-80mm. The process route comprises the following steps: big furnace smelting, semi-continuous casting, homogenizing annealing, variable temperature multi-directional forging, extrusion forming and aging treatment, wherein the step of variable temperature multi-directional forging is performed on a hydraulic machine, the temperature of the ingot blank is kept at 380-410 DEG C for 3-5 hours before forging, and the pressing speed is 200-400mm/minute; the step of extrusion forming is performed on a horizontal extruder, the temperature of the ingot blank is kept at 340-350 DEG C for 3-5 hours before extrusion, and the thickness plate with the extrusion ratio of 13-15, the extruded thickness of 50-80mm, the width of 130-200mm and the length of more than or equal to 1000mm is extruded. After the aging treatment, the room-temperature yield strength of the thick plate along the extrusion direction is more than or equal to 260MPa, the tensile strength is more than or equal to 370MPa, and the elongation is more than or equal to 9 percent. The process is high in forming efficiency, and large-scale industrial production can be realized.

Description

technical field [0001] The invention relates to the field of magnesium alloy deformation processing, in particular to the field of forging and extrusion deformation of a Mg-Al-Ag alloy. technical background [0002] Magnesium alloy is an ideal lightweight structural material, which has the advantages of low density, high specific strength, and good shock resistance and noise reduction performance. Magnesium alloy has few movable slip systems at room temperature and poor plastic deformation ability. Its products are mainly castings, with few high-performance deformed parts. The microstructure of castings is uneven and the mechanical properties are poor, which makes it difficult to meet the high performance requirements of some structural parts. Deformed parts have more uniform microstructure, higher mechanical properties and more diverse structures than castings. Therefore, by formulating a reasonable deformation process, combining the plasticity of the magnesium alloy wit...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22F1/06B21C37/02B21C23/06
Inventor 刘楚明万迎春雷义民芦玉波顾洪兵李慧中邹利民
Owner CENT SOUTH UNIV
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