Al-Zn-Mg aluminum alloy with high stress corrosion resistance and preparation method
A stress corrosion and aluminum alloy technology, applied in the field of aluminum alloy processing, can solve problems such as stress corrosion cracking, high-speed rail service environment, and impact on high-speed rail operation safety, etc., to achieve grain refinement, stress corrosion cracking reduction, good mechanical properties and The effect of corrosion resistance
Pending Publication Date: 2022-03-29
ASIA PACIFIC LIGHT ALLOY NANTONG TECH
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Problems solved by technology
The service environment of high-speed rail is relatively harsh, and stress corrosion cracking is very easy to occur. Once stress corrosion cracking occurs, it will seriously affect the operation safety of high-speed rail
Method used
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Embodiment
[0029] Put aluminum ingots and alloys into a melting furnace according to the composition percentages in Table 1, and melt them at 710-760° C. to obtain aluminum alloy melts.
[0030] Among them, the smelting temperature is 710-760°C; the refining procedure is carried out, the refining temperature is 720-740°C, and the time required for refining is 20-30min; the standing process is carried out, and the standing time is 25-35min; the aluminum solution after standing Through online degassing and bipolar filtration; execute the hot top horizontal casting process to cast the aluminum solution, where the casting speed is 70-85mm / min, the cooling water flow rate is 4000-5000L / min; add titanium boron wire in the casting launder, The speed is 2.5-3.5m / min; the homogenization process is carried out, in which the heating temperature is 490-505°C, the holding time is 3h, and natural cooling; the ingot after homogenization annealing is preheated at 465-485°C, and the mold cylinder is prehe...
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Abstract
The invention relates to the technical field of aluminum alloy processing, and discloses an Al-Zn-Mg aluminum alloy with high stress corrosion resistance and a preparation method of the Al-Zn-Mg aluminum alloy. The aluminum alloy comprises, by mass, less than or equal to 0.15% of Si, 0.18-0.25% of Cu, less than or equal to 0.25% of Fe, 0.1-0.18% of Mn, 0.4-0.5% of Mg, less than or equal to 0.1% of Ti, 0.12-0.18% of Zr, 0.05-0.15% of Cr, less than or equal to 0.05% of other elements and the balance Al. According to the preparation method, reasonable aluminum alloy components are designed, the stress corrosion resistance of the material is further improved on the premise that the mechanical property is guaranteed, and the good mechanical property and corrosion resistance can be obtained through the preparation method.
Description
technical field [0001] The invention belongs to the technical field of aluminum alloy processing, in particular to an Al-Zn-Mg aluminum alloy with high resistance to stress corrosion and a preparation method thereof. Background technique [0002] Al-Zn-Mg alloys have strong mechanical properties, corrosion resistance, and high specific strength, and are widely used in aerospace, high-speed trains, automobiles, ships, and construction industries. The service environment of high-speed rail is relatively harsh, and stress corrosion cracking is very easy to occur. Once stress corrosion cracking occurs, it will seriously affect the operation safety of high-speed rail. Contents of the invention [0003] The purpose of the present invention is to provide a high stress corrosion resistance Al-Zn-Mg aluminum alloy and its preparation method. By designing a reasonable aluminum alloy composition, the stress corrosion resistance of the material can be further improved under the premis...
Claims
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IPC IPC(8): C22C21/10C22C1/02C22F1/053B21C23/04B21C37/00
CPCC22C21/10C22C1/026C22F1/053C22F1/002B21C37/00B21C23/04
Inventor 吴桂兰李其荣浦俭英储剑月
Owner ASIA PACIFIC LIGHT ALLOY NANTONG TECH