Heat treatment method for preventing 2A12 aluminum alloy parts from solid solution overburning
A technology of aluminum alloy parts and heat treatment method, which is applied in the field of heat treatment of 2A12 aluminum alloy, can solve the problems of aluminum alloy overheating, parts scrapping, workpiece blistering, etc., and achieve the effects of increased tensile strength, low heat preservation temperature, and elimination of internal stress
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Embodiment 1
[0030] A special-shaped porous 2A12 aluminum alloy workpiece (H112 state) with an outer diameter of 200mm and an effective thickness of 17mm was heated by a 60Kw aluminum alloy box-type resistance furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 480°C and keep it warm for 25min; Water cooled to room temperature, wherein the quenching transfer time is 7 seconds, and the water temperature is 25°C. Natural aging, the tensile strength of the final material is 500MPa, the elongation after fracture is 17%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and there is no overheating phenomenon.
Embodiment 2
[0032] A thin-walled 2A12 aluminum alloy workpiece (H112 state) with a cylindrical hollow structure with a large end diameter of 110mm, a small end diameter of 90mm, and an effective thickness of 2.5mm was heated by a 70Kw aluminum alloy vertical water quenching furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 470°C and keep it warm for 15 minutes; after the heat preservation is over, raise the temperature of the workpiece to 492°C at a heating rate of 0.7°C / min; keep the workpiece at 492°C for 60 minutes; after the heat preservation is over Water cooled to room temperature, where the quenching transfer time is 4 seconds, and the water temperature is 50°C. Natural aging, the tensile strength of the final material is 495MPa, the average elongation after fracture is 20%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and ther...
Embodiment 3
[0034] A lath-type 2A12 aluminum alloy workpiece (H112 state) with an effective thickness of 22mm is heated by a 70Kw aluminum alloy vertical water quenching furnace. First, put the workpiece in the furnace at room temperature, and send power at full power to heat the workpiece to 460°C and keep it warm for 35min; Water cooled to room temperature, wherein the quenching transfer time is 9 seconds, and the water temperature is 35°C. Natural aging, the tensile strength of the final material is 500MPa, the elongation after fracture is 18%, there is no abnormality in the coloring flaw detection, the surface quality is good, the high-magnification structure is normal, and there is no overheating phenomenon.
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