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A kind of heat treatment method of corrosion-resistant al-mg series alloy

A heat treatment method and alloy technology are applied in the field of heat treatment of corrosion-resistant Al-Mg alloys, which can solve problems such as inability to meet the requirements at the same time, and achieve the effects of low residual stress, wide alloy range and large process window.

Active Publication Date: 2022-05-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the current processes can meet the requirements of naval applications at the same time, and the indicators of high strength and corrosion resistance

Method used

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  • A kind of heat treatment method of corrosion-resistant al-mg series alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The flat ingots prepared according to the ingredients listed in Table 1 (the mass fraction of impurities Fe and Si should not exceed 0.4%), wherein Al, Mg, and Ag are added in the form of pure Al, pure Mg, and pure Ag, and Mn, Sc, Zr, Sb, Be and 0.03-0.10% Ti added for the first time are all added in the form of master alloy, and the slab ingot is obtained after smelting and casting.

[0036] The obtained flat ingots were homogenized at 500 °C, kept for 24 hours, and then air-cooled; the homogenized flat ingots were milled, and then heated to 400 °C to start rolling, and rolled with large deformation. Leave 20% deformation.

[0037] The plate is subjected to cold rolling treatment with a total deformation of 15%. The deformation amount of the pass is adjusted according to the rolling conditions. The deformed products are put into an annealing furnace for stabilization treatment. Double-stage heating is adopted. , and then cooled to 290 ~ 310 ℃, kept for 4 hours, and ai...

Embodiment 2

[0043] The round ingots prepared according to the components listed in Table 2 (the mass fraction of impurities Fe and Si should not exceed 0.4%), wherein Al, Mg, and Ag are added in the form of pure Al, pure Mg, and pure Ag, and Mn, Sc, Zr, Sb, Be and 0.03-0.10% Ti added for the first time are all added in the form of master alloy, and round ingots are obtained after smelting and casting.

[0044] The obtained flat ingot was homogenized at 500°C, kept for 24 hours, and then air-cooled; the homogenized flat ingot was milled, and then heated to 430°C to start extrusion, with an extrusion ratio of 9 to 30.

[0045]The profiles with different Mg contents are cold-stretched by 1% to 6%, and then the profiles are stabilized and heated in stages. The primary heating temperature is 380°C, and the temperature is kept for 0.5h; Heat preservation for 2 to 6 hours, and air-cooled.

[0046] The stabilized product is subjected to cryogenic treatment, and the liquid nitrogen cooling temper...

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Abstract

The invention belongs to the field of nonferrous metals and their preparation and processing, and relates to a heat treatment method for corrosion-resistant Al-Mg alloys. The key point of the present invention is that the involved Al-Mg series alloy is subjected to cold deformation, cryogenic treatment, stabilization treatment and cold deformation treatment to improve the strength, structure uniformity and comprehensive performance of the alloy. Through cold deformation, cryogenic treatment, stabilization treatment, etc., the distribution of β phase on the grain boundary and in the grain of Al-Mg alloy can be effectively improved, so that the distribution of the β phase on the grain boundary is uniform and discontinuous, and the distribution in the grain is more dispersed. To achieve the purpose of balancing the potential difference between the inside and outside of the grain boundary, adjust the performance and improve the corrosion performance at the same time. The Al-Mg series alloy processed by the heat treatment process in the present invention has high strength, good corrosion resistance, weldability and formability, and is suitable for deformed products such as profiles, plates, forgings, and meets the needs of large ship materials. technical specification requirements.

Description

technical field [0001] The invention belongs to the field of non-ferrous metals and their preparation and processing, and relates to a heat treatment method for corrosion-resistant Al-Mg alloys. The Al-Mg alloys treated by the method have high strength and good corrosion resistance, and are especially suitable for full Use in marine environment. Background technique [0002] Al-Mg series alloys are aluminum alloys that cannot be strengthened by heat treatment. The annealed state has good plasticity, good corrosion performance, and good weldability. It is an ideal material for lightweight ships. However, due to the fact that they cannot be strengthened by heat treatment, the strength of the alloy is generally relatively low. In order to meet the needs of use, the strength can be increased by cold work hardening, but it will seriously damage the corrosion performance and reduce the formability. Al-Mg alloys are used in the field of ships. At the same time, it is required to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/06
CPCC22F1/047C22C21/06
Inventor 孙进宝虞朝智李国爱孙刚陈军洲王少华陆政
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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