Micro-alloy optimized al-mg-si alloy for vehicle body and preparation method thereof

A micro-alloy and alloy technology, applied in the field of aluminum alloy materials, can solve the problems of low yield strength and good formability of alloys, and achieve the effects of low yield strength, suppressing negative effects, and excellent comprehensive properties

Active Publication Date: 2017-07-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although traditional micro-alloying elements (Cu, Ag, Mn, etc.) can effectively promote the bake hardening of 6000 series aluminum alloys, it is often difficult to ensure that the alloy obtains a lower yield strength and better formability in the T4 state, while the 6000 series The formability of aluminum alloy is the bottleneck restricting the aluminum technology of automobile body

Method used

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  • Micro-alloy optimized al-mg-si alloy for vehicle body and preparation method thereof
  • Micro-alloy optimized al-mg-si alloy for vehicle body and preparation method thereof
  • Micro-alloy optimized al-mg-si alloy for vehicle body and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Microalloy optimized Al-Mg-Si alloy for car body, said alloy is composed of the following components by mass percentage: Mg: 1.15%; Si: 0.73%; Mn: 0.063%; Fe: 0.12%; In: 0.11% ; The rest are Al.

[0025] The Al-Mg-Si alloy for car body with micro-alloy optimization, the preparation method is as follows: (with 99.98% industrial pure aluminum, pure Mg, pure In and Al-Si master alloy as raw materials, according to a certain order of addition, add in resistance melting furnace and melt , and then pour the alloy melt into a water-cooled steel mold for forming (the size of the steel mold is 300mm (length) * 200mm (width) * 60mm (height)); then the ingot is cut and milled, and the temperature is increased by 50°C / h Rate: 440°C*4h+560°C*6h two-stage homogenization treatment is performed on the cut ingot; the hot rolling deformation is carried out on a Φ350 two-roll hot rolling unit, the starting rolling temperature is 540°C, and the final rolling temperature is lower than 300 ...

Embodiment 2

[0048] Microalloy optimized Al-Mg-Si alloy for car body, said alloy is composed of the following components in terms of mass percentage: Mg: 1.09%; Si: 0.71%; Mn: 0.061%; Fe: 0.13%; In: 0.06% ; The rest are Al. The preparation method is the same as shown in Example 1;

Embodiment 3

[0050] Microalloy optimized Al-Mg-Si alloy for car body, said alloy is composed of the following components in terms of mass percentage: Mg: 1.11%; Si: 0.69%; Mn: 0.063%; Fe: 0.11%; In: 0.21% ; The rest are Al. The preparation method is the same as shown in Example 1;

[0051] Example 2 and Example 3 also have lower T4 temper yield strength and better formability.

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Abstract

The invention discloses a microalloy-optimized Al-Mg-Si alloy for car bodies. The alloy is composed of the following components in percentage by mass: 1.0-1.5 wt.% of Mg, 0.5-1.0 wt.% of Si, 0-0.5 wt.% of In, at most 0.5 wt.% of Mn, at most 0.2 wt.% of Fe and the balance of Al. After a trace amount of In element is added into the Al-Mg-Si alloy, the locking and release in the hollow position in the heat treatment process is controlled to implement the kinetic control on natural aging and artificial aging and effectively inhibit the negative influence of the natural aging on the alloy, so that the alloy obtains lower T4-state yield strength and higher formability, and the baking hardenability is enhanced; and thus, the alloy has excellent comprehensive properties. The method effectively solves the problem in natural aging, which has troubled the academic community and industrial community many years.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to an Al-Mg-Si alloy for a vehicle body with micro-alloy optimization and a preparation method thereof. Background technique [0002] 6000 series aluminum alloy (Al-Mg-Si alloy) has medium to high strength, good weldability and corrosion resistance, good formability, high surface quality after baking, and can be strengthened by heat treatment. Key materials have been widely used in foreign-made body panels, such as doors, roof covers, engine panels, and rear trunk lids. In order to meet the needs of the automotive industry, 6000-series aluminum alloys need to have a low A higher yield strength to obtain sufficient stamping formability, while having a higher yield strength after coating and baking so that the alloy has better dent resistance. However, my country's 6000-series aluminum alloys cannot be applied on a large scale in industry, mainly because of its insufficient stamping form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/08C22C1/03C22F1/047
CPCC22C1/026C22C1/03C22C21/08C22F1/047
Inventor 贾志宏翁瑶瑶丁立鹏刘莹莹刘庆
Owner CHONGQING UNIV
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