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Heat treatment method and aluminum alloy plate to improve natural aging stability of 6000 series aluminum alloy

A technology of aluminum alloy sheet and heat treatment method, applied in the field of aluminum alloy heat treatment, can solve the problems of inability to maintain baking paint hardening performance for a long time, short natural aging stability, inability to maintain formability, etc. The effect of reducing room temperature stagnation effect and reducing hardening effect

Active Publication Date: 2019-07-02
SHANDONG NANSHAN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above-mentioned pre-aging treatment system can improve the paint hardening performance of the alloy to a certain extent, there are still some shortcomings in the process. The high-temperature short-term pre-aging treatment method has high efficiency, but the time is too short and it is not easy to control in actual production; The efficiency of low-temperature and long-term pre-aging treatment is low, which is not conducive to actual production; and the use of solid solution water quenching to the required pre-aging temperature, and then heat preservation or cooling, controlling the temperature after quenching is not easy to implement in actual production
In addition, the above method also has the problem that the natural aging stability is short, and the good formability cannot be maintained before stamping, and the hardening performance of the baking paint cannot be maintained for a long time.

Method used

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  • Heat treatment method and aluminum alloy plate to improve natural aging stability of 6000 series aluminum alloy
  • Heat treatment method and aluminum alloy plate to improve natural aging stability of 6000 series aluminum alloy
  • Heat treatment method and aluminum alloy plate to improve natural aging stability of 6000 series aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] A heat treatment method for improving the natural aging stability of 6000 series aluminum alloys, comprising the following steps:

[0106] (1) Melting 6016 aluminum alloy, after 560°C-12h homogenization annealing process, hot rolling and cold rolling to 1.2mm plate;

[0107] Among them, the 6016 aluminum alloy is composed of the following components in mass percentage: 0.95% Mg, 0.75% Si, 0.12% Cu, 0.3% Fe, 0.05% Cr, 0.04% Ti, 0.03% Zn, and the balance is Al.

[0108] (2) Heat treat the 6016 aluminum alloy sheet obtained in step (1) in a continuous annealing furnace, first heat it to 550°C at a heating rate of 10°C / s, hold it for 15min, and then quench it to 60°C at a quenching rate of 30°C / s ℃, keep warm for 10min, then rapidly raise the temperature to 120℃ at a heating rate of 30℃ / s, keep warm for 3min, and finally air cool to room temperature;

[0109] (3) After cooling the aluminum alloy sheet in step (2) to room temperature for one week, two weeks, one month, two ...

Embodiment 2

[0116] A heat treatment method for improving the natural aging stability of 6000 series aluminum alloys, comprising the following steps:

[0117] (1) Melting 6016 aluminum alloy, after 520°C-24h homogenization annealing process, hot rolling and cold rolling to 1.2mm plate;

[0118] Among them, the 6016 aluminum alloy is composed of the following components in mass percentage: 0.50% Mg, 1.00% Si, 0.10% Cu, 0.50% Fe, 0.05% Cr, 0.15% Ti, 0.02% Zn, and the balance is Al.

[0119] (2) Heat-treat the 6016 aluminum alloy sheet obtained in step (1) in a continuous annealing furnace, first heat it to 560°C at a heating rate of 10°C / s, keep it for 10min, and then quench it to 40°C at a quenching rate of 35°C / s ℃, keep warm for 15min, then rapidly raise the temperature to 100℃ at a heating rate of 30℃ / s, keep warm for 5min, and finally air cool to room temperature;

[0120] (3) After cooling the aluminum alloy sheet in step (2) to room temperature for one week, two weeks, one month, two...

Embodiment 3

[0125] A heat treatment method for improving the natural aging stability of 6000 series aluminum alloys, comprising the following steps:

[0126] (1) Melting 6016 aluminum alloy, after homogenization annealing process at 540°C-18h, hot rolling and cold rolling to 1.2mm plate;

[0127] Among them, the 6016 aluminum alloy is composed of the following components in mass percentage: Mg 1.20%, Si 0.40%, Cu 1.00%, Cr 0.15%, Ti 0.02%, Zn 0.10%, and the balance is Al.

[0128] (2) Heat treat the 6016 aluminum alloy plate obtained in step (1) in a continuous annealing furnace, first heat it to 580°C at a heating rate of 8°C / s, keep it for 10min, and then quench it to 60°C at a quenching rate of 30°C / s ℃, keep warm for 5min, then rapidly raise the temperature to 110℃ at a heating rate of 20℃ / s, keep warm for 4min, and finally air cool to room temperature;

[0129] (3) After cooling the aluminum alloy sheet in step (2) to room temperature for one week, two weeks, one month, two months, ...

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Abstract

The invention discloses a heat treatment method capable of improving natural aging stability of 6000-series aluminum alloy and an aluminum alloy plate, and relates to the technical field of aluminum alloy heat treatment. The heat treatment method comprises the following steps that a 6000-series aluminum alloy plate is subjected to solid solution treatment and quenched to 40-60 DEG C, heat is preserved for 5-20 min, then the temperature is quickly increased to 100-120 DEG C, heat is preserved for 2-5 min, and then the plate is cooled to the room temperature. By means of the method, the problems that a traditional solid solution pre-aging treatment method is poor in natural aging stability and short in bake hardening performance maintaining time are relieved. By adoption of the heat treatment method, the stability in the room temperature stagnating process can be better regulated and controlled, and thus adverse influences of natural aging are restrained; and not only can the aluminum alloy keep a good forming property for a long time, but also the paint-bake hardenability of the aluminum alloy is obviously improved, after paint baking, the strength and hardness of the obtained aluminum alloy plate are obviously improved, the yield strength is greater than 200 MPa, and the hardness is greater than 95 HB.

Description

technical field [0001] The invention relates to the technical field of heat treatment of aluminum alloys, in particular to a heat treatment method and an aluminum alloy plate for improving the natural aging stability of 6000 series aluminum alloys. Background technique [0002] Based on the global demand for energy saving and environmental protection, the relevant departments of the automobile industry are gradually intensifying the pace of promoting lightweight. The lightweight of automobiles can mainly be promoted from the selection of raw materials and structural design. The 6000-series aluminum alloy has become the best substitute material for traditional steel materials due to its advantages of low density, high formability and corrosion resistance, and can be used as automobile body panels. [0003] The 6000 series aluminum alloy belongs to the Al-Mg-Si series, and the commonly used ones include 6016, 6111 and 6022 aluminum alloys. The high strength of 6000 series alu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C22C1/02
CPCC22C1/026C22F1/04
Inventor 程仁策李辉吕正风辛涛张涛史春丽房洪杰刘文静朱鹏程
Owner SHANDONG NANSHAN ALUMINUM
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