The heating and cooling cycle heat treatment method near the initial melting temperature of the primary precipitation phase of the cast alloy
A heat treatment method and casting magnesium alloy technology, which is applied in the field of heating and cooling cycle heat treatment near the initial melting temperature of the primary precipitation phase of cast alloys, to achieve the effects of wide application range, optimized structure, and improved alloy performance
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Embodiment 1
[0031] Example 1: Metal mold gravity casting aluminum-zinc-magnesium-copper-chromium alloy cyclic heat treatment at 481°C for 5 times
[0032] The material used in this embodiment is aluminum-zinc-magnesium-copper-chromium cast aluminum alloy, and its chemical composition is: 5% magnesium, 3% zinc, 1% copper, 2% chromium, 78.6% aluminum, 0.2% iron, and 0.2% silicon. %; the initial melting temperature of the primary precipitation phase of the aluminum-zinc-magnesium-copper-chromium cast aluminum alloy is 481 ℃: using a crucible resistance furnace to melt Al-5wt.%Mg-3wt.%Zn-1wt.%Cu-2wt. %Cr-0.2wt.%Fe-0.2wt.%Si alloy, pour the alloy liquid into a metal mold to obtain an ingot with a size of 150mm×100mm×20mm, and then cut out 10mm×10mm×10mm in the center of the ingot The sample is processed as follows:
[0033] The samples were heated from room temperature to 491°C at a ramp rate of 10°C / min in a programmable air circulation oven, followed by holding at 491°C for 5 min. Then, th...
Embodiment 2
[0034] Example 2: Metal mold low-pressure casting aluminum-silicon alloy heat treatment for 20 cycles of heating and cooling at around 577°C
[0035]The materials used in this embodiment are aluminum-silicon cast aluminum alloys, and the aluminum-silicon cast aluminum alloys contain components and mass ratios as follows: silicon 20%, and the rest is aluminum (80%); the cast Al-20wt.%Si alloy The initial melting temperature of the primary precipitation phase is 577 °C: the Al-20wt.%Si alloy is smelted in a graphite crucible using a crucible resistance furnace, and then a disc-shaped part with a size of Φ350mm × 120mm is obtained by metal mold low-pressure casting. A sample of 10mm × 10mm × 10mm is cut from the center of the casting, and the sample is processed as follows:
[0036] The sample was heated from room temperature to 587°C at a heating rate of 5°C / min, followed by incubation at 587°C for 30 min. Then, the sample was cooled to 567°C at a cooling rate of 5°C / min, and k...
Embodiment 3
[0037] Example 3: Centrifugal casting of aluminum-magnesium-erbium alloy heating and cooling cycles around 450°C for 10 times
[0038] The materials used in this embodiment are aluminum-magnesium-erbium cast aluminum alloys, and the aluminum-magnesium-erbium cast aluminum alloys contain components and mass ratios as follows: magnesium 5%, erbium 0.5%, and the rest is aluminum (94.5%); the cast Al-5wt %Mg-0.5wt.%Er alloy's primary precipitation initial melting temperature is 450℃: Al-5wt.%Mg-0.5wt.%Er alloy was smelted in a graphite crucible using a crucible resistance furnace, followed by centrifugation in a metal-type bedroom Casting method The casting is formed to obtain a casting with a size of Φ300mm × 400mm, and then a sample of 10mm × 10mm × 10mm is cut out of the casting, and the sample is processed as follows:
[0039] The sample was heated from room temperature to 455°C at a ramp rate of 5°C / min, followed by incubation at 455°C for 30 min. Then, the sample was cooled...
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