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7000-series aluminum alloy for automobile stand column and manufacturing method of plate by 7000-series aluminum alloy

A manufacturing method and technology of aluminum alloy, applied in the field of alloy materials, can solve the problems of reducing the lightweight effect of aluminum auto parts, high technical requirements for processing and heat treatment, and increasing the difficulty of design and forming, so as to improve quenching sensitivity and reduce alloying. The effect of reducing the solid solubility and reducing the quenching sensitivity

Pending Publication Date: 2020-11-03
BEIBU GULF UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the aluminum alloys used in new energy vehicles are mainly 5000 series and 6000 series aluminum alloys. Due to their low strength, the tensile strength is below 400MPa, so this type of aluminum alloys is mainly used for automobile panels, decorative parts, etc. It is difficult to be used as a load-bearing structural part of an automobile
[0003] The 7000 series aluminum alloy is an ultra-high-strength aluminum alloy, and its tensile strength can reach more than 500MPa. It is an ideal structural material. However, due to the difficulty in forming and its high performance requirements for processing and heat treatment technology, this series of alloys is used in new energy vehicles. applications are severely limited
The reduction of alloy strength, under the premise of ensuring safety, the section thickness of new energy vehicle pillars must be increased, and the increase in thickness will not only reduce the lightweight effect of aluminum auto parts, but also increase the difficulty of design and molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of 7000 series aluminum alloy for automobile column, wherein the weight percent of each alloy element is calculated as:

[0021] Si 0.043%, Fe 0.092%, Cu 1.320%, Mn 0.057%, Mg 2.423%, Cr 0.081%; Zn 5.855%, Ti 0.032%, Zr 0.069%, the balance is Al and unavoidable impurities, the single Unavoidable impurities ≤ 0.005%, the sum of impurities ≤ 0.1%.

[0022] A manufacturing method for processing the above-mentioned automobile column with 7000 series aluminum alloy into a plate, comprising the following steps:

[0023] 1) Melting and casting: Mix various alloying elements according to weight percentage, melt at 750°C for 6 hours, then hold at 730°C for 7 hours, degas and filter to make ingots (flat ingots with specifications of 420mm×1650mm×7000mm );

[0024] 2) Soaking heat treatment: The ingot is subjected to three-stage homogenization heat treatment. The specific process is: 420°C / 6h+450°C / 12h+470°C / 12h, cooling out of the furnace, cutting the head and tail after...

Embodiment 2

[0047] A kind of 7000 series aluminum alloy for automobile column, wherein the weight percent of each alloy element is calculated as:

[0048] Si 0.051%, Fe 0.084%, Cu 1.513%, Mn 0.069%, Mg 2.237%, Cr 0.075%, Zn6.0%, Ti 0.053%, Zr 0.04%, the balance is Al and unavoidable impurities, the single Unavoidable impurities ≤ 0.005%, the sum of impurities ≤ 0.1%.

[0049] A manufacturing method for processing the above-mentioned automobile column with 7000 series aluminum alloy into a plate, comprising the following steps:

[0050] 1) Melting and casting: Mix various alloying elements according to weight percentage, melt at 740°C for 7 hours, then hold at 740°C for 5 hours, degas and filter to make ingots (flat ingots with specifications of 420mm×1650mm×7000mm );

[0051] 2) Soaking heat treatment: The ingot is subjected to three-stage homogenization heat treatment. The specific process is: 450°C / 3h+470°C / 24h+480°C / 24h, cooling out of the furnace, cutting the head and tail after coo...

Embodiment 3

[0060] A kind of 7000 series aluminum alloy for automobile column, wherein the weight percent of each alloy element is calculated as:

[0061] Si 0.038%, Fe 0.075%, Cu 1.8%, Mn 0.078%, Mg 2.586%, Cr 0.068%, Zn 5.574%, Ti 0.089%, Zr 0.975%, the balance is Al and unavoidable impurities, the single Unavoidable impurities ≤ 0.005%, the sum of impurities ≤ 0.1%.

[0062] A manufacturing method for processing the above-mentioned automobile column with 7000 series aluminum alloy into a plate, comprising the following steps:

[0063] 1) Melting and casting: Mix various alloying elements according to weight percentage, melt at 760°C for 5 hours, then hold at 730°C for 7 hours, degas and filter to make ingots (flat ingots with specifications of 420mm×1650mm×7000mm );

[0064] 2) Soaking heat treatment: The ingot is subjected to three-stage homogenization heat treatment. The specific process is: 400°C / 8h+420°C / 12h+480°C / 24h, cooling out of the furnace, cutting the head and tail after c...

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Abstract

The invention discloses a 7000-series aluminum alloy for an automobile stand column and a manufacturing method of a plate by the 7000-series aluminum alloy, and belongs to the technical field of alloymaterials. The 7000-series aluminum alloy for the automobile stand column is composed of, by weight percent, less than or equal to 0.05% of Si, less than or equal to 0.1% of Fe, 1.2%-1.8% of Cu, lessthan or equal to 0.1% of Mn, 2.2%-2.6% of Mg, less than or equal to 0.1% of Cr, 5.5%-6.0% of Zn, less than or equal to 0.1% of Ti, 0.04%-0.1% of Zr and the balance Al and inevitable impurities, wherein the total amount of the inevitable impurities is less than or equal to 0.1%. The plate prepared according to the formula and the method has higher mechanical properties (the tensile strength is 540MPa or above, the yield strength is 460 MPa or above, and the ductility is larger than 14%), and the hot stamping forming percent of pass is high (the hot stamping forming percent of pass is 95% or above).

Description

technical field [0001] The invention relates to an alloy material, in particular to a method for manufacturing a 7000 series aluminum alloy for an automobile column and a plate thereof. Background technique [0002] In order to improve the battery life of new energy vehicles, the use of lightweight aluminum alloy materials to manufacture and process auto parts has become a widely used method of modern automobile lightweighting. It is estimated that for every 10% weight loss of a car, the cruising range can be increased by about 5.5%. At present, the aluminum alloys used in new energy vehicles are mainly 5000 series and 6000 series aluminum alloys. Due to their low strength, the tensile strength is below 400MPa, so this type of aluminum alloys is mainly used for automobile panels, decorative parts, etc. It is difficult to be used as a load-bearing structure for automobiles. [0003] The 7000 series aluminum alloy is an ultra-high-strength aluminum alloy, and its tensile str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 宋丰轩林振良黄海东李庆
Owner BEIBU GULF UNIV
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