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Method for producing flat products made of aluminum alloys

a technology of aluminum alloys and flat products, applied in the field of aluminum metallurgy, can solve the problems of reducing ductility, most labor-intensive and power-consuming operations in the manufacture of flat rolled, and increasing the pressure on reducing production costs, and achieve the effect of eliminating costly thermal annealing steps

Inactive Publication Date: 2010-02-04
KAMENSK URALSKIY METALLURGICAL WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]It is therefore an object of the present invention to provide a method for annealing or relieving cold work in the course of processing aluminum flat rolled or otherwise processed products that eliminates the costly thermal annealing steps of the prior art.SUMMARY OF THE INVENTION

Problems solved by technology

In addition to commercial pressures to improve the physical properties of aluminum alloys, recent adverse economic conditions have imposed additional pressures on reducing production costs.
One of the most labor intensive and power consuming operations in the manufacture of flat rolled aluminum alloys are those operations related to the necessity to relieve the hardened (cold worked) condition originating in the course of cold rolling.
This hardening results in ductility reduction that makes further rolling impossible.
Such handling results in the consumption of large amounts of time and power consumption that translate into high costs of production.
One of the most labor intensive steps during performance of these annealing operations is the removal of rolled coils from the hot rolling mill, coil transportation and placement into and removal from the annealing furnaces.
The obvious disadvantages of this method are the high labor cost and energy intensiveness of the process.
Another less apparent disadvantage relates to the impossibility eliminating some intermetallic compounds that originate in the course of annealing, for example the formation of Al6 (Fe, Mn).
The existence of coarse intermetallic compounds such as Al6 (Fe, Mn) in the alloy structure negatively influences the properties of the cold rolled material, in particular, it reduces its ductility.
All of these steps incur expenditures of time, labor, and electric power.
In the course of this prior art process the hardened condition is relieved only in the face-hardened zone, and it is also impossible to eliminate the formation of some intermetallic compounds such as, Al6(Fe, Mn) in the application of this prior art process to more conventional aluminum alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034]Performance of ion-beam treatment in the rolling Al—Mg alloy sheet (so-called, magnaliums).

[0035]After the rolling of an AlMg6 until alloy hardening / cold work makes further rolling impossible. The surface of the rolled sheet is irradiated with Ar+ ions having an energy of 40 keV, and an ion current density of 400 mA / cm2. The sheet has a thickness of 4 mm and is irradiated from both sides for a period of 30 seconds

[0036]In the course of irradiation continuous monitoring of target temperature is carried out by means of a chromel-alumel thermocouple. The ultimate temperature, to which sheets are heated within the short course of irradiation, does not exceed 400° C.

[0037]Mechanical testing of tensile specimens cut out from hardened, annealed, and irradiated sheets was performed at Kamensk Uralsky Metallurgical Works J.S.Co. These tests show that as a result of ion irradiation, irrespective of specimen temperature, ductility increases due to a substantial decrease in alloy / sheet st...

example 2

[0044]Performance of ion-beam treatment in the course of rolling sheets in aluminum alloy 1441 of system Al—Li—Cu—Mg with lithium content of 1.8-2.1 wt %.

[0045]After cold rolling to the point that further rolling is impossible (a thickness of about 1.0 mm), instead of applying a conventional intermediate annealing at T=380-420° C. for 2 hours, both surfaces of a sheet in alloy 1441 are irradiated with Ar+ ions having an energy of 40 keV, with ion current density of 400 mA / cm2.

[0046]The results of mechanical testing of initially hardened, thermally annealed, and irradiated specimens show that the mechanical properties of sheets in alloy 1441 after ion-beam treatment are close to the properties obtained by intermediate thermal annealing (Table 2). Irregular cellular dislocations with cell central area average diameters of from 0.5 to 2 μm are found in hardened alloy 1441.

[0047]After thermal annealing at temperatures 380-420° C. for 2 hours the structure of alloy 1441 is irregular: the...

example 3

[0050]Ion-beam treatment in the course of rolling sheets in aluminum alloy VD1 (Al—Cu—Mg with Mn additives with reduced content of all components (duralumin of increased ductility).

[0051]After cold rolling to a point where alloy hardening makes further rolling impossible instead of conventional intermediate annealing both surfaces of a VD1 alloy sheet having a thickness of 1.5 mm are irradiated for 30 seconds with Ar+ ions having an energy of 40 keV, with an ion current density of 400 mA / cm2.

[0052]The results of mechanical testing of cold work hardened, thermally annealed, and irradiated specimens of alloy VD1 show that after ion-beam treatment a substantial decrease in strength is observed. This loss decrease in strength approximates that obtained by intermediate thermal annealing (see Table 2).

[0053]Electron microscope examination of cold-worked alloy VD1 indicates the presence of a dislocation grained structure with narrow borders between individual cells. Cell diameter is 0.5-2 ...

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Abstract

A method of producing flat products in aluminum alloys comprising:A) cold rolling to a hardened condition:B) applying a short-time ion beam surface treatment; andC) repeating steps A and B until a flat rolled product of a specified thickness is obtained.The surface treatment is preferably performed using an ion beam of atomic mass A≧10 amu having a power of between about 20-40 keV and an ion current density of between about 0.1-1 mA / cm2 for from about 5 to about 200 seconds. In the process of irradiation flat products may be continuously and uniformly displaced with respect to the ion beam.

Description

FIELD OF THE INVENTION[0001]The present invention is related to aluminum metallurgy, and more particularly to a novel method for alleviating the hardened (cold worked) condition that requires stress relieving and structure improvement during conventional processing.BACKGROUND OF THE INVENTION [0002]The role of aluminum alloys as structural materials is constantly increasing. In addition to commercial pressures to improve the physical properties of aluminum alloys, recent adverse economic conditions have imposed additional pressures on reducing production costs.[0003]One of the most labor intensive and power consuming operations in the manufacture of flat rolled aluminum alloys are those operations related to the necessity to relieve the hardened (cold worked) condition originating in the course of cold rolling. Hardening or cold working in this context describes a condition wherein flat rolled aluminum hardens in the course of cold rolling. This hardening results in ductility reduct...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D1/26C21D8/02B21B1/00B21D31/00
CPCC22C21/02C22F3/00C22F1/04
Inventor SHKOLNIKOV, ALEXSEY R.MOZHAROVSKY, SERGEY M.FILIPPOV, ALEKSEY V.OVCHINNIKOV, VLADAMIR V.GAVRILOV, NIKOLAY V.GUSHCHINA, NATALIA V.
Owner KAMENSK URALSKIY METALLURGICAL WORKS
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