Forming process of a medium-strength heat-resistant magnesium alloy triangular profile

A forming process, magnesium alloy technology, applied in the field of magnesium alloy deformation processing, Mg-Al-Ag series magnesium alloy forging and extrusion deformation, can solve the problems of not deep deformation, small extrusion ratio, not obvious, etc., to achieve production High efficiency and good surface quality

Inactive Publication Date: 2016-01-20
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large cross-section of the triangular profile, the extrusion ratio is relatively small, the deformation is not deep, and the effect of refining the grain and increasing the strength is not obvious

Method used

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  • Forming process of a medium-strength heat-resistant magnesium alloy triangular profile
  • Forming process of a medium-strength heat-resistant magnesium alloy triangular profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A smelting furnace with a capacity of 1 ton is used to melt raw materials, semi-continuous casting, and peeling to process a Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.02Ca (wt.%) alloy ingot with a diameter of Ф200mm. The ingot is subjected to upsetting gradient temperature-variable multi-directional forging on the hydraulic press. Before forging, the ingot is kept at 370-400°C for 2 hours, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the elongation The pass reduction is 5-10%, and the temperature of the upper and lower cutting boards is 150-200°C. For each upsetting, return to the furnace for annealing, the annealing temperature is lowered by 20°C compared to the previous heating temperature, and the annealing time is 1h. After three times of upsetting, the pier is thickened to a diameter of Ф250mm. The forged ingot is directly extruded on a horizontal extruder with an extrusion ratio of 10, the temperature of the mold ...

Embodiment 2

[0018] Example 2: A melting furnace with a capacity of 1 ton is used to melt raw materials, semi-continuous casting, and peeling to process a Mg-8.5Al-0.8Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) alloy ingot with a diameter of Ф240mm. The ingot is subjected to upsetting gradient temperature-variable multi-directional forging on a hydraulic press. Before forging, the ingot is held at 380°C for 4 hours, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the elongation pass The reduction is 5-10%, and the temperature of the upper and lower cutting boards is 150-200°C. Each upsetting is returned to the furnace for annealing, and the annealing temperature is lowered by 20°C compared with the previous heating temperature, and the annealing time is 2h. After three times of upsetting, the diameter of the pier reaches Ф300mm. The forged ingot is directly extruded on a horizontal extruder with an extrusion ratio of 14, the temperature of the mold and ext...

Embodiment 3

[0019] Example 3: A melting furnace with a capacity of 1 ton is used to melt raw materials, semi-continuous casting, and peeling to process a Mg-9.0Al-0.6Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) alloy ingot with a diameter of Ф200mm. Carry out upsetting gradient variable temperature multi-directional forging on the ingot billet on the hydraulic press, heat the ingot billet at 380°C for 2 hours before forging, press speed 200-400mm / min, upsetting pass reduction 30-40%, drawing pass The reduction is 5-10%, and the temperature of the upper and lower cutting boards is 150-200°C. Each upsetting is returned to the furnace for annealing, and the annealing temperature is lowered by 20°C compared to the previous heating temperature, and the annealing time is 1h. After three times of upsetting, the diameter of the pier reaches Ф250mm. The forged ingot is directly extruded on a horizontal extruder with an extrusion ratio of 10, the temperature of the mold and extrusion cylinder is controlled...

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Abstract

The invention discloses a forming process of a medium-strength heat-resistant magnesium alloy triangular profile. The process steps include: large furnace melting, semi-continuous casting, homogenizing annealing, multi-directional forging, extrusion forming and heat treatment after forming. Among them, the multi-directional forging is carried out on a hydraulic press. Before forging, the blank is kept at 370-400°C for 2-4 hours and subjected to three times of upsetting. Extrusion is carried out on a horizontal extruder, with an extrusion ratio of 10-14, and a triangular profile with a length ≥ 1000mm is extruded. The profile has high strength and good heat resistance, which can meet the performance requirements of structural parts in the aerospace field. After heat treatment, the yield strength at room temperature along the extrusion direction is ≥265MPa, the tensile strength is ≥375MPa, and the elongation is ≥9%.

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 series magnesium alloy. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good shock resistance and noise reduction performance, and is an ideal lightweight structural material. At present, its products are mainly castings. Studies have found that magnesium alloys can obtain more uniform structure, better mechanical properties and higher stability than castings after deformation processing. However, at room temperature, the magnesium alloy has few slip systems that can be activated, and its plastic deformation ability is poor. Therefore, the deformation of magnesium alloys is carried out under high temperature conditions, and magnesium alloys are more sensitive to process parameters such as deformation temperature and deformation speed. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22F1/06
Inventor 刘楚明肖宏超雷义民芦玉波顾洪兵李慧中邹利民
Owner CENT SOUTH UNIV
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