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Magnesium alloy pipe material for high-performance automobile anti-collision bar and manufacturing method thereof

A technology for automobile crash bars and magnesium alloys, applied in the field of metal material processing, can solve the problems of poor plastic deformation ability of high-strength magnesium alloys, and achieve the effects of uniform grain morphology and good uniformity of mechanical properties

Active Publication Date: 2017-01-25
SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention improves the strength of the material by adding rare earth elements Gd and Y, and overcomes the problem of poor plastic deformation ability of high-strength magnesium alloys through secondary extrusion deformation, and at the same time optimizes smelting, deformation processing parameters and heat treatment processes to finally obtain Magnesium alloy pipe with high strength, good plasticity, age strengthening and reinforcement

Method used

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  • Magnesium alloy pipe material for high-performance automobile anti-collision bar and manufacturing method thereof
  • Magnesium alloy pipe material for high-performance automobile anti-collision bar and manufacturing method thereof
  • Magnesium alloy pipe material for high-performance automobile anti-collision bar and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] 1. According to the mass fraction of 8% Gd, 3% Y, 0.5% Zr, 88.5% Mg and unavoidable impurities, the semi-continuous casting method is used to prepare a Φ300mm magnesium alloy semi-continuous ingot, and the ingot is cut Each ingot block with a length of 500 mm is formed. The method of semi-continuous ingot casting is as follows: firstly preheat each master alloy of Mg-Gd, Mg-Y, Mg-Zr and pure Mg to 180-220 ° C; Magnesium is placed in a protective gas (V SF6 :V CO2 =1:99) in a well-type resistance crucible furnace, when the temperature of the magnesium liquid reaches 720-740°C, add Mg-Gd and Mg-Y directly into the magnesium liquid in turn, and wait for the Mg-Gd and Mg-Y to melt Afterwards, raise the temperature of the magnesium melt to 760-780°C, and add Mg-Zr; after the Mg-Zr melts, skim off the scum on the surface, and stir for 10 minutes; then raise the temperature of the magnesium melt to 780-800°C, and keep it warm for 20 After ~30 minutes, the molten magnesium is...

Embodiment 2

[0036] 1. According to the mass fraction of 8% Gd, 3% Y, 0.5% Zr, 88.5% Mg and unavoidable impurities, the semi-continuous casting method is used to prepare a Φ300mm magnesium alloy semi-continuous ingot, and the ingot is cut into ingot blocks each with a length of 500 mm; the method of semi-continuous ingot casting is as follows: firstly, each master alloy of Mg-Gd, Mg-Y, Mg-Zr and pure Mg are preheated to 180-220°C; then the pure Magnesium is placed in a protective gas (V SF6 :V CO2 =1:99) in a well-type resistance crucible furnace, when the temperature of the magnesium liquid reaches 720-740°C, add Mg-Gd and Mg-Y directly into the magnesium liquid in turn, and wait for the Mg-Gd and Mg-Y to melt Afterwards, raise the temperature of the magnesium melt to 760-780°C, and add Mg-Zr; after the Mg-Zr melts, skim off the scum on the surface, and stir for 10 minutes; then raise the temperature of the magnesium melt to 780-800°C, and keep it warm for 20 After ~30 minutes, the molt...

Embodiment 3

[0041] 1. According to the mass fraction of 8% Gd, 3% Y, 0.5% Zr, 88.5% Mg and unavoidable impurities, the semi-continuous casting method is used to prepare a Φ300mm magnesium alloy semi-continuous ingot, and the ingot is cut into ingot blocks each with a length of 500 mm; the method of semi-continuous ingot casting is as follows: firstly, each master alloy of Mg-Gd, Mg-Y, Mg-Zr and pure Mg are preheated to 180-220°C; then the pure Magnesium is placed in a protective gas (V SF6 :V CO2 =1:99) in a well-type resistance crucible furnace, when the temperature of the magnesium liquid reaches 720-740°C, add Mg-Gd and Mg-Y directly into the magnesium liquid in turn, and wait for the Mg-Gd and Mg-Y to melt Afterwards, raise the temperature of the magnesium melt to 760-780°C, and add Mg-Zr; after the Mg-Zr melts, skim off the scum on the surface, and stir for 10 minutes; then raise the temperature of the magnesium melt to 780-800°C, and keep it warm for 20 After ~30 minutes, the molt...

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Abstract

The invention discloses a high-performance magnesium alloy tube for automobile bumper bars and a manufacturing method thereof. The magnesium alloy tube is a reinforcing-rib-bearing tube in a shape of a Chinese character 'ri'. The magnesium alloy tube comprises the following raw materials in percentage by weight: 7.0-9.5% of Gd, 2.5-3.5% of Y, 0.2-0.6% of Zr, and the balance of Mg and impurities. The manufacturing method comprises the following steps: after proportioning the alloy raw materials, carrying out semi-continuous casting to obtain a semi-continuous cast ingot; carrying out solution treatment on the semi-continuous cast ingot to obtain an as-cast alloy cast ingot; after preheating the as-cast alloy cast ingot at 400-450 DEG C, carrying out compression deformation to obtain a bar; and after preheating the bar at 380-420 DEG C, carrying out secondary compression deformation to obtain the tube. The average grain size of the alloy is 6 mu m or so; and the magnesium alloy tube has the advantages of uniform crystal grain shape, random grain orientation and favorable comprehensive properties.

Description

technical field [0001] The invention relates to an alloy in the field of metal material processing and a processing method thereof, in particular to a magnesium alloy pipe material for a high-performance automobile anti-collision bar and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys are the lightest metal structural materials, their density is only 2 / 3 of aluminum and 1 / 4 of steel, and they have high specific strength, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding, and easy processing and forming and easy recycling. Industrially, magnesium alloys are mostly obtained by casting, including low pressure casting, squeeze casting, gravity casting, lost foam casting and new semi-solid casting. However, casting defects such as voids and inclusions greatly reduce its mechanical properties, which seriously limit the application of cast magnesium alloy parts. Compared with cast magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 靳丽孙捷董杰丁文江
Owner SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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