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Heat treatment method for improving impact resistance of 6xxx series aluminum alloy in T6/T651 state

A heat treatment method and impact resistance technology, which is applied in the field of heat treatment to improve the impact resistance of T6/T651 state 6xxx series aluminum alloys, can solve the problems of low production efficiency, lack of feasibility of large-scale industrial production, long process time, etc. question

Active Publication Date: 2018-06-22
广西南南铝加工有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in many cases, limited by the quality level of raw materials and the level of casting technology, the use of this method still has great limitations.
[0004] To further improve the impact resistance of 6xxx series aluminum alloys in the T6 / T651 state without changing the alloy composition, at present, the method of under-solution and under-aging is mainly used, but this method is inevitable while improving the impact resistance of the material. It will lose a certain mechanical strength of the material; there are also literatures that propose the T6I6 process method, but this process requires three times of artificial aging, of which the second aging takes thousands of hours, the process time is long, and the production efficiency is low. Feasibility of large-scale industrial production

Method used

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  • Heat treatment method for improving impact resistance of 6xxx series aluminum alloy in T6/T651 state
  • Heat treatment method for improving impact resistance of 6xxx series aluminum alloy in T6/T651 state
  • Heat treatment method for improving impact resistance of 6xxx series aluminum alloy in T6/T651 state

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Experimental program
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Effect test

Embodiment 1

[0031] S1. Rolling: cast 6061 ingot, preheat the ingot at 460°C for 8 hours, hot-roll to 10mm, the final temperature of hot-rolling is 260°C, and cold-roll the hot-rolled coil to 6mm finished thickness after cooling;

[0032] S2. Cut off the super-thick part of the head of the cold-rolled coil obtained in step S1, take samples at the qualified part of the thickness, and do an annealing test for 2 hours of heat preservation, and the material properties change with the annealing temperature as follows: figure 1 As shown, it is determined that the complete recrystallization annealing temperature of the material is ≥300°C;

[0033] S3. Complete recrystallization annealing: use a temperature of 320°C to anneal the cold-rolled coil for 2 hours;

[0034] S4. After the coil is cut, the solution heat treatment is carried out in the roller hearth furnace at 535 ° C for 40 minutes. After the solution, the water is quenched quickly. The material transfer time between the solution and the ...

Embodiment 2

[0050] S1. Rolling: casting 6082 ingots, preheating the ingots at 460°C for 6 hours, hot rolling until the thickness of the finished product is 5mm, and the final temperature of hot rolling is 265°C;

[0051] S2. Cut off the super-thick part of the head of the hot-rolled coil obtained in step S1, take samples at the qualified part, and do an annealing test for 2 hours of heat preservation. The material properties change with the annealing temperature as follows: Figure 4 As shown, it is determined that the complete recrystallization annealing temperature of the material is ≥360°C;

[0052] S3. Complete recrystallization annealing: using a temperature of 370 ° C, annealing the hot-rolled coil for 2 hours;

[0053] S4. After the coil is cut, the solution heat treatment is carried out at 535°C for 30 minutes in the roller hearth furnace, and the water is quenched quickly after the solution. The material transfer time between the solution and the quenching process is 2 seconds, a...

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Abstract

The invention discloses a heat treatment method for improving impact resistance of 6xxx series aluminum alloy in the T6 / T651 state. The method comprises the steps of rolling a cast ingot; determiningthe lowest temperature X DEG C required by the complete recrystallization annealing of rolled material; adopting the temperature of X-470 DEG C to carry out annealing treatment on the rolled materialfor 0.5-6 hours; carrying out solid solution quenching; and carrying out artificial aging. According to the heat treatment method for improving impact resistance of the 6xxx series aluminum alloy in the T6 / T651 state, on the premise that alloy components are not changed, impact resistance of the 6xxx material in the T6 / T651 state can be remarkably improved through a special heat treatment method.

Description

technical field [0001] The invention relates to the field of aluminum alloy smelting, in particular to a heat treatment method for improving the impact resistance of 6xxx series aluminum alloys in T6 / T651 state. Background technique [0002] 6xxx belongs to the heat-treatable strengthening alloy, and its total types are 6061, 6013, 6082, 6016, etc., which have the characteristics of low density, high strength, and excellent weldability. They are widely used in many fields such as transportation, construction, and aerospace. With the continuous deepening of the application of 6xxx alloys in various fields, in addition to the requirements for conventional properties such as strength, elongation, and formability, more and more industries, especially the transportation field, have requirements for the impact resistance of 6xxx aluminum alloys. Performance also poses special requirements. For example, new energy vehicles use 6xxx aluminum alloy as the battery bottom plate, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/002C22F1/04
Inventor 邓松云任月路黄奎陈愿情何立才王华春周文标
Owner 广西南南铝加工有限公司
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