Thermal treatment method for improving bake-hardening performance and natural aging stability of 6xxx-series aluminum alloys

A heat treatment method and bake hardening technology, applied in the field of aluminum alloy processing, can solve the problems of good aging stability, time-consuming, low production efficiency, etc., and achieve the effects of improving bake hardening performance, reducing energy consumption, and long transfer time

Inactive Publication Date: 2015-03-25
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can better improve the bake hardening performance, and has good aging stability, and can maintain the bake hardening performance for 3 or 4 months, but the heat treatment process is time-consuming and the production efficiency is not high

Method used

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  • Thermal treatment method for improving bake-hardening performance and natural aging stability of 6xxx-series aluminum alloys
  • Thermal treatment method for improving bake-hardening performance and natural aging stability of 6xxx-series aluminum alloys
  • Thermal treatment method for improving bake-hardening performance and natural aging stability of 6xxx-series aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After the 6016 aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1.0mm; the thin plate is rapidly water-quenched to room temperature within 20 minutes after solution treatment at 535°C / 5min, and enters the air-cushion furnace at a temperature of 50°C Insulation, heat preservation for 1min, air cooling to below 40°C, and then natural aging for one week, one month, two months, six months, then 175°C / 30min baking experiment, the mechanical properties of the samples before and after baking are shown in Table 1 Show.

[0027] Table 1 Bake hardening properties of pre-aged and air-cooled samples at 50℃

[0028]

[0029] Note: Rp0.2 is yield strength, Rm is tensile strength, A is elongation, BHR is bake hardening value (difference of yield strength before and after baking), the same below.

Embodiment 2

[0031] After the 6016 aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1.0mm; the thin plate is rapidly water-quenched to room temperature within 20 minutes after solution treatment at 535°C / 5min, and enters the air-cushion furnace at a temperature of 70°C Insulation, keep the temperature for 1min and then cool down to below 40°C, the cooling rate is 20°C / h, then after natural aging for one week, one month, two months, and six months, conduct a baking experiment at 175°C / 30min, the mechanical properties of the sample before and after baking The performance is shown in Table 2.

[0032] Table 2 Bake hardening properties of samples pre-aged at 70°C with a cooling rate of 20°C / h

[0033]

[0034]

Embodiment 3

[0036] After the 6016 aluminum alloy ingot is homogenized, it is hot-rolled and cold-rolled to a thin plate of 1.0mm; the thin plate is rapidly water-quenched to room temperature and within 20 minutes after solution treatment at 535°C×5min, and then enters an air-cushion furnace at a temperature of 80°C Insulation, heat preservation for 1min and then lower the temperature to below 40°C with a cooling rate of 20°C / h, then natural aging for one week, one month, two months, and six months, then perform a baking test at 175°C / 30min, the samples before and after baking The mechanical properties are shown in Table 3.

[0037]Table 3 Bake hardening properties of samples pre-aged at 80°C with a cooling rate of 20°C / h

[0038]

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Abstract

The invention discloses a thermal treatment method for improving bake-hardening performance and natural aging stability of 6xxx-series aluminum alloy, and belongs to the technical field of aluminum alloy processing. The thermal treatment method comprises the following steps: within 20 minutes after performing solution treatment on 6xxx-series aluminum alloy plates and quenching to the room temperature, entering a furnace at 50-150 DEG C, and cooling to be lower than 40 DEG C at the cooling rate of 3-20 DEG C/h within 20 minutes after keeping the temperature. The thermal treatment method disclosed by the invention is simple in process, high in production efficiency, and capable of effectively improving the natural ageing stability and the bake-hardening performance of the 6xxx-series aluminum alloy car plates, so that the 6xxx-series aluminum alloy car plates can be applicable to automotive body aluminum alloy plates.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a heat treatment method for an aluminum alloy body panel material for automobiles, especially a heat treatment method for improving the baking hardening performance and natural aging stability of a 6xxx series aluminum alloy body panel. Background technique [0002] Automobile lightweight is one of the development directions of automobiles. Aluminum alloy has the characteristics of high specific strength, good machinability, excellent welding performance and corrosion resistance, high impact toughness and high-speed extrusion into various profiles with complex structures. It has many advantages in terms of energy saving, emission reduction and collision safety, so it has been widely used in the modern automobile industry. [0003] Aluminum alloys for automobile body panels are mainly 6xxx series alloys. The high strength of 6xxx series aluminum alloys needs art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/043
CPCC22F1/04C22F1/043
Inventor 任月路徐燕萍朱玉涛黄程毅曾光乐永康
Owner 广西南南铝加工有限公司
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