Method for improving intergranular corrosion performance of Al-Cu-Mg aluminium alloy

An al-cu-mg, intergranular corrosion technology, which is applied in the field of improving the intergranular corrosion performance of Al-Cu-Mg aluminum alloys, can solve the problem of long time period, lack of influence rules of alloy intergranular corrosion performance, and complex soaking process and other problems, to achieve the effects of reducing quenching sensitivity, shortening homogenization heat treatment time, and good operability

Active Publication Date: 2019-05-31
CHINALCO MATERIALS APPL RES INST CO LTD +1
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Problems solved by technology

The soaking process is complex and takes a long time
Most of the existing research on the homogenization heat treatment process of Al-Cu-Mg alloys focuses on how to reduce the content of coarse phases in the microstructure and control the distribution of dispersed phase precipitation. Study on the distribution of the second phase at the grain boundary and its influence on the intergranular corrosion performance of subsequent alloys

Method used

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  • Method for improving intergranular corrosion performance of Al-Cu-Mg aluminium alloy
  • Method for improving intergranular corrosion performance of Al-Cu-Mg aluminium alloy
  • Method for improving intergranular corrosion performance of Al-Cu-Mg aluminium alloy

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Embodiment 1

[0033] The composition of aluminum alloy is calculated by mass percentage: Cu4.0wt.%, Mg1.4wt.%, Mn0.5wt.%, Ti<0.1wt.%, Fe≤0.2wt.%, Si≤0.1wt.%, the balance for Al. Semi-continuous casting into flat ingots with a thickness of 45mm.

[0034] The process for homogenizing the aluminum alloy includes: heating the aluminum alloy from room temperature to 465° C. at a heating rate of 50° C. / h for 6 hours, and then cooling in air. After the ingot is soaked, hot rolling, cold rolling, intermediate annealing, solid solution and natural aging treatment are carried out to prepare plates. Before ingot hot rolling, preheat at a heating rate of 460°C / 3h, roll a 6-7mm thick plate from 40mm thickness, pass reduction 2-5mm, and control the hot rolling exit temperature above 300°C. The hot-rolled sheet is sequentially subjected to recrystallization annealing at 410°C / 45min, cold-rolled and thinned to 2mm, and then stress-relief annealed at 280°C / 60min. After the plate is subjected to high-temp...

Embodiment 2

[0036] The composition of aluminum alloy is calculated by mass percentage: Cu4.0wt.%, Mg1.4wt.%, Mn0.5wt.%, Ti<0.1wt.%, Fe≤0.2wt.%, Si≤0.1wt.%, the balance for Al. Semi-continuous casting into flat ingots with a thickness of 45mm.

[0037] The alloy is homogenized by the low-temperature short-time homogenization heat treatment system of the method of the present invention, and after the ingot is soaked, it is subjected to hot rolling, cold rolling, intermediate annealing, solid solution and natural aging treatment to prepare plates. The specific process is as follows: from room temperature to 475°C at an average heating rate of 50°C / h for 6 hours, then air cooling. Before ingot hot rolling, preheat at 460°C / 3h, roll a 6-7mm thick plate from 40mm thickness, pass reduction 2-5mm, and control the hot rolling exit temperature above 300°C. The hot-rolled sheet was subjected to recrystallization annealing at 410°C / 45min. Afterwards, cold rolling is carried out to reduce the thick...

Embodiment 3

[0039] The composition of aluminum alloy is calculated by mass percentage: Cu4.0wt.%, Mg1.4wt.%, Mn0.5wt.%, Ti<0.1wt.%, Fe≤0.2wt.%, Si≤0.1wt.%, the balance for Al. Semi-continuous casting into flat ingots with a thickness of 45mm.

[0040]The alloy is homogenized by the low-temperature short-time homogenization heat treatment system of the method of the present invention, and after the ingot is soaked, it is subjected to hot rolling, cold rolling, intermediate annealing, solid solution and natural aging treatment to prepare plates. The specific process is as follows: from room temperature to 485°C at an average temperature increase rate of 50°C / h for 6 hours and then air cooling. Before ingot hot rolling, preheat at 460°C / 3h, roll a 6-7mm thick plate from 40mm thickness, pass reduction 2-5mm, and control the hot rolling exit temperature above 300°C. The hot-rolled sheet was subjected to recrystallization annealing at 410°C / 45min. Afterwards, cold rolling is carried out to r...

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Abstract

The invention provides a method for improving the intergranular corrosion performance of an Al-Cu-Mg aluminium alloy. The method includes the steps that (1) an Al-Cu-Mg aluminium alloy ingot is cast;and (2) homogenizing treatment is conducted on the cast ingot. According to the technical scheme, the problem of dispersed phase precipitation is overcome by homogenizing heat treatment, and a fine, uniform and dispersed AlCuMn phase can be precipitated in a matrix within short homogenizing time; and by low temperature short-time treatment, the dendritic structure in the microstructure is eliminated, meanwhile a small amount of coarse phases remaining in the microstructure are controlled, the aluminum matrix is in the state of undersaturation in solid solution, the quenching sensitivity of materials is reduced, the precipitation of nanoscale second phases at the material grain boundary is inhibited after solid solution, and the effects of improving the production efficiency and improving the intergranular corrosion resistance of a product are obtained. The method is suitable for industrial production of large cast ingots, has good operability, can shorten the time of homogenizing heattreatment and saves energy consumption of heat treatment.

Description

technical field [0001] The invention relates to a homogenization heat treatment method for alloys, in particular to a method for improving the intergranular corrosion performance of Al-Cu-Mg aluminum alloys. Background technique [0002] As aircraft manufacturing has changed from purely emphasizing static strength to fatigue and modern damage tolerance design, the requirements for structural materials have gradually evolved from only emphasizing strength to emphasizing the comprehensive performance of toughness, fatigue resistance and corrosion resistance. Al-Cu-Mg series alloy is an aluminum alloy with Cu as the main alloying element. This series of aluminum alloy is characterized by high strength, excellent heat resistance and processing performance, but its corrosion resistance is inferior to other aluminum alloys. Under certain conditions intergranular corrosion will occur. Since the 1970s, through alloying, improving purity and improving heat treatment, a series of new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/14C22C21/16C22C21/18C22F1/057
Inventor 肖翔刘成毛晓东周泽宇杨中玉
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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