Retrogression treatment process of 6000-series aluminum alloy thin plate for automobile

A treatment process and aluminum alloy technology, which is applied in the field of regression treatment process, can solve the problems of deterioration of hardening of baking paint, reduction of hardness of alloy plate, increase of strength, etc., and achieve stable performance, energy saving and easy realization

Inactive Publication Date: 2018-05-25
NORTHEASTERN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of 6000-series T4 state or T4P state alloy plates stored for a long time, resulting in increased strength and deterioration of paint hardenability, the purpose of the present invention is to provide a regression treatment process for 6000 series aluminum alloy sheets for automobiles, through reasonable regression treatment process, can significantly reduce the hardness of the alloy plate that has been parked for a long time, and maintain stable performance in a short period of time, which is conducive to stamping and forming, and at the same time obtains excellent bake hardenability, and achieves rapid aging response

Method used

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  • Retrogression treatment process of 6000-series aluminum alloy thin plate for automobile
  • Retrogression treatment process of 6000-series aluminum alloy thin plate for automobile
  • Retrogression treatment process of 6000-series aluminum alloy thin plate for automobile

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Embodiment 1

[0032] Cold-rolled 1mm-thick 6016 aluminum alloy sheet for automobile body, after solid solution heat preservation at 560℃×20min in a high-temperature hot air circulation furnace, air-cooled to room temperature, and parked at room temperature for more than 10 months (T4 state). Regression treatment was carried out in a medium-temperature hot air circulation furnace. The regression treatment system was 225°C×5min. After water quenching to room temperature, the hardness test was carried out within 1 day. Subsequently, hardness tests were carried out at 10 days, 12 days and 14 days, respectively. After the regression treatment, the sample that stayed at room temperature for 10 days was selected for simulated baking. The simulated coating baking is carried out in a low-temperature hot air circulation furnace, the process system is 185 ° C × 20min, and the hardness test is carried out after the baking paint treatment.

Embodiment 2

[0034]Cold-rolled 1mm-thick 6016 aluminum alloy sheet for automobile body, after solid solution heat preservation at 560℃×20min in a high-temperature hot air circulation furnace, air-cooled to room temperature, and parked at room temperature for more than 10 months (T4 state). Regression treatment was carried out in a medium-temperature hot air circulating furnace. The regression treatment system was 250°C×2min. After water quenching to room temperature, the hardness test was carried out within 1 day. Subsequently, hardness tests were carried out at 10 days, 12 days and 14 days, respectively. After the regression treatment, the sample that stayed at room temperature for 10 days was selected for simulated baking. The simulated coating baking is carried out in a low-temperature hot air circulation furnace, the process system is 185 ° C × 20min, and the hardness test is carried out after the baking paint treatment.

Embodiment 3

[0036] Cold-rolled 1mm-thick 6016 aluminum alloy sheet for automobile body, after solid solution heat preservation at 560℃×20min in a high-temperature hot air circulation furnace, air-cooled to room temperature, and parked at room temperature for more than 10 months (T4 state). Regression treatment was carried out in a medium-temperature hot air circulation furnace. The regression treatment system was 300°C×15min. After water quenching to room temperature, the hardness test was carried out within 1 day. Subsequently, hardness tests were carried out at 10 days, 12 days and 14 days, respectively. After the regression treatment, the sample that stayed at room temperature for 10 days was selected for simulated baking. The simulated coating baking is carried out in a low-temperature hot air circulation furnace, the process system is 185 ° C × 20min, and the hardness test is carried out after the baking paint treatment.

[0037] Table 1 shows the hardness values ​​tested within one...

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Abstract

The invention relates to a retrogression treatment process of a 6000-series aluminum alloy thin plate for an automobile, and belongs to the field of aluminum alloy heat treatment. For a T4-state alloyplate, after being subjected to solution hardening, the 6000-series aluminum alloy automobile body thin plate is placed at room temperature for 10 months or above; for a T4P-state alloy plate, afterbeing subjected to solution hardening, the 6000-series aluminum alloy automobile body thin plate is immediately subjected to pre-ageing treatment and then is placed at room temperature for 10 monthsor above; the solution hardening temperature ranges from 550 DEG C to 570 DEG C, and the time ranges from 15 min to 30 min; the retrogression treatment temperature ranges from 175 DEG C to 300 DEG C,and the time ranges from 1 min to 15 min; and the pre-ageing temperature ranges from 50 DEG C to 150 DEG C, and the time ranges from 5 min to 8 h. Through the reasonable retrogression treatment process, the hardness of the alloy plate placed for a long time can be remarkably reduced, performance is kept stable in the short term, punching forming is facilitated, meanwhile, excellent baking hardenability is obtained, and the rapid ageing effect is achieved.

Description

technical field [0001] The invention relates to a regression treatment process for improving the strength and aging stability performance of a 6000 series aluminum alloy body thin plate used for automobiles before stamping, and belongs to the field of aluminum alloy heat treatment. Background technique [0002] Severe air pollution and energy shortage make it imperative to reduce the weight of automobiles. Aluminum alloy has many advantages such as light specific gravity, only 1 / 3 of steel, good machinability, excellent welding and corrosion resistance, high recycling rate, etc., so it is widely used in the modern automobile industry. Among them, 6016 and 6022 with better formability are mainly used for automobile body sheet in Europe, while North America is more inclined to use 6111 alloy with higher strength. The heat treatment process of 6000 series aluminum alloy body sheet mainly includes: solid solution, pre-aging and paint hardening. After the aluminum strip is solu...

Claims

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Application Information

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IPC IPC(8): C22F1/043C22C21/02
CPCC22C21/02C22F1/002C22F1/043
Inventor 李勇王昭东高冠军李家栋许光明付天亮韩毅田勇王丙兴
Owner NORTHEASTERN UNIV
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