A heat treatment method for improving the impact resistance of 6xxx series aluminum alloys in the 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 problem of loss of mechanical strength, lack of feasibility of large-scale industrial production, and long process time And other issues
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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 at 535°C for 40 minutes in the roller hearth furnace, and the water quenching is rapid after the solution. 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 of thickness, 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, it is solution heat treated at 535°C for 30 minutes in a roller hearth furnace. After solid solution, it is quickly water quenched. The material transfer time between solution and quenching is 2 seconds, and the cooling rate of...
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