Heat treatment and quenching process of Aluminum Alloy
Aluminum alloy heat treatment and quenching process
1, aluminum alloy heat treatment process.
The purpose of this process is to make a large number of usable hardening elements such as copper, magnesium, zinc or polyester solids into solid solutions, which must be kept at a high temperature of 535 degrees - 550 degrees for a sufficient time of 6-8 hours to obtain a homogeneous solid solution. 1. Aluminum alloy solid solution temperature, aluminum alloy wheel solid solution point is 530 degrees, dissolution point is 555 degrees. At this temperature, it begins to melt into molten aluminum.
Key points of aluminum alloy heat treatment process:
A. When the temperature rises, first open the windmill cooling water smoothly, and then set the windmill operating temperature to complete the combustion conditions.
When entering the furnace (when the casting is placed, A side up, A side down (when it is dissolved))
B. Solution aging treatment conditions 545 degrees * 8H + 130 degrees * 6H temperature must be stable and uniform temperature, depending on the strength, material, characteristics, test decision of the rim design.
C. Quenching water temperature 60 degrees-80 degrees water temperature, casting is not easy to deform, quenching time from the door to the top layer of the casting completely bubbling into the water, the time is 16 seconds-20 seconds, to complete instant quenching.
D. After solution treatment, the whole inspection item, deformation inspection, plastic surgery, steel word to prevent abnormal quality tracking, after aging, measure the hardness of a casting in the upper and lower layers of the trolley, the value is 65-75HB. Continuous automatic operation is the same as high-temperature operation. After pre-extraction, the furnace is further introduced into the furnace and the furnace is placed and removed at a time set by a timer.
2. Aluminum alloy quenching delay process.
When the casting is removed from the solution temperature in the furnace during quenching, the elapsed time is the quenching delay, which is 15 seconds> 18 seconds is optimal. The most common quenching fluid is water, the rest is air or liquid nitrogen. However, it is necessary to consider the stresses and deformations caused by quenching. Sometimes hot water is needed to prevent deformation and cracking. 5. When the hardening treatment of the heat-treated aluminum alloy is quenched to normal temperature, due to the low temperature, the solubility of the solute is low, and a saturated unstable state is produced. Thus, some microstructures will precipitate in the substrate and the pellet will be emitted at room temperature. Natural aging, if it is necessary to heat to a certain temperature, precipitation is artificial aging.
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