JPH05320810A - Aluminum alloy clad material for high temperature forming - Google Patents

Abstract

PURPOSE:To manufacture an aluminum alloy clad material excellent in high temp. formability by specifying the chemical compsns. of the base metal and clad material. CONSTITUTION:The one side or both sides of the base metal constituted of an allay contg. as essential elements, by weight, 0.5 to 7.5% Mg and contg. one or >= two kinds of elements selected from a group of 0.03 to 0.55% Cr, 0.03 to 2.5% Mn, 0.03 to 0.25% Zr, 0.005 to 0.35% Ti, 0.03 to 0.5% Fe and 0.03 to 1.5% Ni, and the balance Al are clad with a cladding material constituted of an allay contg. 1% Si and <=1% Fe and contg. total <=0.5% of other elements, respectively by <=1%, and the balance substantial Al. In this way, the objective Al allay clad material showing excellent workability by high temp. or warm forming and having a good appearance after working can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy clad material for high temperature forming which is suitable for a product member used in a marine atmosphere such as a ship and which has excellent corrosion resistance and high temperature formability.

[0002]

2. Description of the Prior Art Generally, ships, especially relatively small fishing boats,
A material obtained by press-forming a steel plate and then coating the surface of the formed product is used for the outer plate of a hull such as a leisure boat. However, this material has a steel plate that corrodes from the part when the coating film is damaged or peeled off,
It is necessary to repaint regularly. For this reason, in recent years, the number of ships using FRP as the outer plate of the hull has increased rapidly. However, such a FRP hull has difficulty in scrap processing after the life of the ship has expired, and environmental pollution due to leaving the abandoned ship at the seaside or the like is a problem.

[0003]

Against this background, as a structural material such as an outer plate of a hull, an aluminum plate material, which is more excellent in corrosion resistance than a steel plate and is better in scrap processing / recyclability than FRP, has been attracting attention. There is. Among them, an aluminum material made of an Al-Mg alloy that exhibits excellent corrosion resistance in a marine atmosphere and has excellent mechanical strength and formability is used.

On the other hand, aluminum plate materials generally tend to be inferior in formability to steel plates and cannot be used for products having complicated shapes, so that their applications are limited. Therefore, a warm forming method or a high temperature forming method has been studied as a technique capable of forming an aluminum plate material into a product having a complicated shape. In this method, a part or the whole of the material and the mold are heated to 100 to 500 ° C., and the material is molded in a state having high moldability. It is particularly suitable.

Further, in this high temperature molding method, bulge molding utilizing pneumatic pressure or hydraulic pressure has been studied in addition to ordinary press working. According to this bulge molding method, a male mold is not required because pneumatic pressure or hydraulic pressure is used as the pressurizing medium, and the material can be uniformly deformed, so that the molding limit is improved.

However, when high-temperature forming is performed on an aluminum plate material made of an Al-Mg alloy, the concentration of Mg atoms on the surface of the plate material becomes high, and the surface is oxidized to change its color to greenish black. Not preferable. Also,
When the surface of such an aluminum plate material is coated, the oxide film formed on the surface lowers the adhesion of the coating film, so that the coating film easily peels off and the corrosion resistance is poor. Therefore, the oxide film formed on the surface of the plate material must be removed chemically and mechanically, resulting in poor production efficiency. The formation of the oxide film is affected by the molding temperature and the molding time, and it appears remarkably in the hydraulic press molding or the basil molding method in which the molding speed is relatively small.

The present invention has been made in view of the above points, and exhibits excellent workability in a high temperature forming method or a warm forming method, and has a good appearance after processing, and an aluminum alloy clad material for high temperature forming. The purpose is to provide.

[0008]

As a first aspect of the present invention, 0.5 to 7.5 wt% of Mg is contained as an essential element, and 0.03 to 0.55 wt% of Cr and 0.0 to Mn of Cr are contained.
3 to 2.5% by weight, Zr 0.03 to 0.25% by weight, T
i 0.005 to 0.35% by weight, Fe 0.03 to 0.5
%, And one or more elements selected from the group consisting of 0.03 to 1.5% by weight of Ni, the balance being one side of a base material made of an alloy having substantially Al, or On both sides, Si 1% by weight or less and Fe 1% by weight or less are contained, and the other elements are each 0.1%.
The total content is 0.5% by weight or less, and
There is provided an aluminum alloy clad material for high-temperature forming, characterized by being clad with a coating material made of an alloy whose balance is substantially Al.

As a second aspect of the present invention, 0.5 to 7.5% by weight of Mg is contained as an essential element, and 0.03 to 0.55% by weight of Cr and 0.03 to 2.5% of Mn are contained.
% By weight, Zr 0.03 to 0.25% by weight, Ti 0.00
5 to 0.35% by weight, Fe 0.03 to 0.5% by weight, and Ni 0.03 to 1.5% by weight, and contains one or more elements selected from the group consisting of the balance. Is substantially Al on one or both sides of the base material made of an alloy containing Si 1% by weight or less, Fe 1% by weight or less, and Cu 1% by weight or less, and the other elements each being 0.1% by weight or less. Provided is an aluminum alloy clad material for high-temperature forming, characterized by being clad with a coating material, which is contained in a total amount of 0.5% by weight or less and the balance being substantially Al.

Further, in a third aspect of the present invention, 0.5 to 7.5 wt% of Mg is contained as an essential element, and Cu
0.01-0.5% by weight and / or Zn0.02-
2.5 wt% is contained, and Cr is 0.03-0.5.
5% by weight, Mn 0.03 to 2.5% by weight, Zr 0.03
~ 0.25 wt%, Ti 0.005-0.35 wt%,
Fe 0.03 to 0.5% by weight, and Ni 0.03 to
Si 1 wt% or less and Fe 1 wt% on one or both sides of the base material containing one or more elements selected from the group consisting of 1.5 wt% and the balance being substantially Al. The following are contained, and other elements are contained in an amount of 0.1% by weight or less and a total of 0.5% by weight or less, and the remainder is clad with a coating material made of an alloy that is substantially Al. A characteristic aluminum alloy clad material for high temperature forming is provided.

Further, in a fourth aspect of the present invention, 0.5 to 7.5 wt% of Mg is contained as an essential element, and C
u 0.01-0.5 wt% and / or Zn 0.02
.About.2.5 wt.
55 wt%, Mn 0.03 to 2.5 wt%, Zr0.0
3 to 0.25% by weight, Ti 0.005 to 0.35% by weight, Fe 0.03 to 0.5% by weight, and Ni 0.03.
~ 1% or 2 selected from the group consisting of 1.5% by weight
Si of 1 wt% or less, F on one or both sides of the base material containing at least one element and the balance being substantially Al
e1 wt% or less, and Cu 1 wt% or less,
And 0.1% by weight or less of each of the other elements, and 0.5% by weight or less in total, and the balance is substantially A.
There is provided an aluminum alloy clad material for high-temperature forming, which is obtained by clad with a coating material made of an alloy of 1.

[0012]

Here, Mg in the base material alloy can improve the strength and ductility of the obtained base material. This improves the formability of the base material. In particular, when the base material is heated to a high temperature to be molded, it has an effect of uniformly deforming the base material, and as a result, the molding limit is improved. Further, the product obtained from the alloy containing a predetermined amount of Mg is
The static strength is increased, and it is possible to prevent deformation due to an external force, particularly temporal change (creep deformation, etc.) when the hull or the like is subjected to external pressure for a long time. Further, even if the coating material of the product is scratched due to environmental factors, excellent corrosion resistance can be exhibited.

In the present invention, the content of Mg in the base alloy is set to 0.5 to 7.5% by weight. This is because when the content of Mg in the base alloy is less than 0.5% by weight, the above effect is insufficient, and when the content of Mg in the base alloy exceeds 7.5%. This is because a coarse Al-Mg-based compound is generated in the alloy, which deteriorates workability and corrosion resistance.

Cu and Zn in the base alloy are M
A fine compound is generated in the base metal together with g to improve the strength and ductility of the base metal obtained from the base metal alloy, thereby exhibiting the effect of improving the formability of the base metal. However, since Cu and Zn tend to slightly lower the corrosion resistance of the raw material Al, they do not have to be contained in the base alloy when high corrosion resistance is required.

In the present invention, the content of Cu in the base alloy is set to 0.01 to 0.5% by weight, and Zn in the base alloy is set.
Content of 0.02 to 2.5% by weight is set. This is because the effect of improving the formability of the obtained base metal is insufficient when the contents of Cu and Zn in the base alloy are less than the respective lower limits, and the contents of Cu and Zn in the base alloy are insufficient. This is because if the respective upper limits are exceeded, the corrosion resistance of the material obtained will decrease.

Further, Cr, Mn, Zr, T in the base alloy
i, Fe, and Ni each produce a fine compound in the base material together with Al, and have the effect of refining the base material structure to improve the strength and formability of the base material and also improve the corrosion resistance of the material. .. Therefore, it suffices if one or more of these elements are selectively contained.

In the present invention, the Cr content in the base alloy is set to 0.03 to 0.55% by weight, the Mn content is set to 0.03 to 2.5% by weight, and the Zr content is set. The amount is 0.
The content of Ti is set to 0.0 to 0.25% by weight.
The content of Fe is set to 0.0 to 0.35% by weight.
The content of Ni is 0.03 to 0.5% by weight.
Set to 1.5% by weight. This is the Cr in the base alloy,
When the contents of Mn, Zr, Ti, Fe, and Ni are less than the respective lower limits, the effect of improving the formability and corrosion resistance of the obtained base metal is insufficient, and Cr in the base metal alloy,
This is because if the contents of Mn, Zr, Ti, Fe, and Ni exceed the respective upper limits, a coarse compound is generated in the obtained base material and the formability of the base material deteriorates.

Other than the above, Si is mainly mentioned as an impurity element contained in the base alloy. Si produces a Mg-Si-based compound together with Mg during casting of an alloy, and M
Since the substantial content of g is reduced, its effect is reduced, and corrosion resistance is deteriorated, it is preferable that the content is small, but if the content of Si is reduced and the metal is highly purified, The cost will increase, so Si will be
It is not industrially preferable to reduce the content of. Therefore, the Si content in the base alloy is preferably 0.5% by weight or less.

The other trace elements do not adversely affect the effects of the present invention as long as the content thereof is 0.05% by weight or less. Therefore, the content of Be, B, etc. which may be added for the purpose of improving the castability or the additive such as misch metal which may be added for the improvement of the moldability is 0.05% by weight or less. Is preferred.

It is preferable that the coating material alloy is basically a pure Al alloy from the viewpoint of preventing the formation of an oxide film.
Usually, the impurities contained in pure Al are Fe and Si. The contents of Fe and Si in the coating alloy are each set to 1% by weight or less. This is due to the Fe in the coating alloy
When the content of Si and Si exceeds 1% by weight, coarse crystallized substances are generated in the obtained material, which hinders the moldability and corrosion resistance of the coating material. Further, the trace amount of Cu contained in the coating material alloy exerts an effect of improving the corrosion resistance of the obtained coating material. Cu in the coating material alloy can be positively added in a range of 1% by weight or less, if necessary. This is because when the content of Cu in the coating alloy exceeds 1% by weight, the corrosion resistance of the coating material deteriorates.

The ratio of the thickness of the base material to the thickness of the coating material is not particularly limited. If the coating material is thin, Mg tends to diffuse when exposed to high temperatures for a long time, and if the coating material is thick, the strength of the material decreases. Therefore, the ratio of these thicknesses should be determined in relation to the required strength of the material and the manufacturing process conditions. Usually, base material thickness: coating material thickness =
It is preferably 1: 0.05 to 1: 0.30.

Therefore, according to the aluminum alloy clad material for hot forming of the present invention, the content of the contained elements in the base alloy and the coating alloy is regulated as described above, so that excellent high temperature forming is possible. And the corrosion resistance, and the appearance after processing becomes good.

[0023]

EXAMPLES Examples of the present invention will be specifically described below.

Example 1 Mg 0.01% by weight, Ti 0.012% by weight, Fe 0.
09% by weight, 0.07% by weight of Si, 0.02% by weight or less of other elements, and 0.05% by weight or less in total, and the balance of Al and unavoidable impurities is used in the DC casting method. Casting process) was performed to obtain a coating material ingot having a thickness of 400 mm and a width of 2300 mm. This coating material ingot is subjected to chamfering on both sides by 5 mm, then homogenized at 600 ° C. for 8 hours, and then subjected to normal hot rolling and cold rolling in sequence to obtain a thickness of 10
A mm coating plate was prepared.

Next, Mg 4.5 wt% and Ti 0.001
% By weight, 0.02% by weight of Fe, 0.03% by weight of Si, and 0.02% by weight or less of other elements, respectively, totaling 0.0
An alloy containing 8% by weight or less and the balance being Al and inevitable impurities was cast by a DC casting method to have a thickness of 400 mm,
A base metal ingot having a width of 2300 mm was obtained. Both sides of this base metal ingot
Face-cutting was performed for each 0 mm, and the above-mentioned coated plate materials were combined on both sides to form a laminated material having a thickness of 400 mm. This laminated material was homogenized at 440 ° C. for 6 hours and 520 ° C. for 8 hours, and then subjected to normal hot rolling and cold rolling in order to obtain a plate material having a thickness of 1 mm.
The aluminum alloy clad material of Example 1 was produced by applying an annealing treatment for 10 seconds.

The aluminum alloy clad material of Example 1 was examined for high temperature formability and appearance after forming. The results are shown in Table 2 below. The high-temperature formability was evaluated by cutting out 400 × 400 mm pieces from the obtained clad material, subjecting this to a warm-molding bulging test, and determining a molding limit height without cracking. The warm molding overhanging test uses a ball head punch with a diameter of 200 mm and a molding speed of 1 mm /
Second (punch moving speed), molding was performed at 450 ° C.

Examples 2 to 5 and Comparative Examples 2 to 5 Examples similar to Example 1 except that a base material ingot and a coating material ingot were obtained by using the alloys shown in Table 1 consisting of elements and Al. 2-5 and the aluminum alloy clad material of Comparative Examples 2-5 were produced.

With respect to the aluminum alloy clad materials of Examples 2 to 5 and Comparative Examples 2 to 5, the high temperature moldability and the appearance after molding were examined in the same manner as in Example 1. The results are also shown in Table 2 below.

Comparative Example 1 Mg 4.5% by weight, Ti 0.001% by weight, Fe 0.0
Alloy DC containing 2% by weight, 0.03% by weight of Si, 0.02% by weight or less of other elements and 0.08% by weight or less in total, and the balance being Al and inevitable impurities.
It was cast by a casting method to obtain an ingot having a thickness of 400 mm and a width of 2300 mm. Both sides of this ingot are machined by 10 mm,
Homogenization treatment, hot rolling, cold rolling, and annealing treatment were performed under the same conditions as in Example 1 to produce an aluminum alloy sheet material of Comparative Example 1 having a thickness of 1 mm.

With respect to the aluminum alloy sheet material of Comparative Example 1, the high temperature formability and the appearance after forming were examined in the same manner as in Example 1. The results are also shown in Table 2 below.

[0031]

[Table 1]

[Table 2] As is clear from Table 2, the aluminum alloy clad materials of the present invention (Examples 1 to 5) were excellent in high temperature moldability and had a good appearance after heat molding. On the other hand, an aluminum alloy clad material (Comparative Examples 2 and 3) obtained by using a base material alloy containing Mg outside the scope of the present invention and a base material alloy containing Si outside the scope of the present invention were used. The aluminum alloy clad material (Comparative Example 5) obtained by using the aluminum alloy had poor high-temperature formability, and the aluminum alloy clad material obtained by using the conventional alloy (Comparative Example 1) and other materials outside the scope of the present invention were used. The aluminum alloy clad material (Comparative Example 4) obtained by using the base alloy containing the element had a poor appearance after the heat forming.

[0032]

As described above, the high temperature formed aluminum alloy clad material of the present invention exhibits excellent workability in the high temperature forming method or the warm forming method and has a good appearance after processing. ..

Claims (4)

[Claims] 1. Mg as an essential element 0.5 to 7.5% by weight
Is included, and Cr is 0.03 to 0.55% by weight, Mn
0.03 to 2.5% by weight, Zr 0.03 to 0.25% by weight, Ti 0.005 to 0.35% by weight, Fe 0.03 to
Base material made of an alloy containing 0.5% by weight and one or more elements selected from the group consisting of Ni 0.03 to 1.5% by weight and the balance being substantially Al. 1% by weight or less of Si and Fe on one or both sides of
1% by weight or less, and 0.1% by weight or less of each of the other elements, and 0.5% by weight or less in total, and the balance is clad with a coating material made of an alloy having substantially Al. An aluminum alloy clad material for high temperature forming, which is characterized in that 2. Mg as an essential element 0.5 to 7.5% by weight
Is included, and Cr is 0.03 to 0.55% by weight, Mn
0.03 to 2.5% by weight, Zr 0.03 to 0.25% by weight, Ti 0.005 to 0.35% by weight, Fe 0.03 to
Base material made of an alloy containing 0.5% by weight and one or more elements selected from the group consisting of Ni 0.03 to 1.5% by weight, the balance being substantially Al. 1% by weight or less, Fe 1% by weight or less, and Cu 1% by weight or less are contained on one side or both sides, and other elements are contained in an amount of 0.1% by weight or less and 0.5% by weight or less in total. An aluminum alloy clad material for high-temperature molding, characterized in that it is clad with a coating material made of an alloy with the balance being substantially Al. 3. Mg 0.5 to 7.5 wt% as an essential element
Of Cu, 0.01 to 0.5 wt% of Cu and / or 0.02 to 2.5 wt% of Zn, and Cr
0.03 to 0.55 wt%, Mn 0.03 to 2.5 wt%, Zr 0.03 to 0.25 wt%, Ti 0.005 to
1 selected from the group consisting of 0.35% by weight, 0.03 to 0.5% by weight of Fe, and 0.03 to 1.5% by weight of Ni.
One or both sides of the base material containing at least one element or two or more elements, the balance being substantially Al, and containing 1% by weight or less of Si and 1% by weight or less of Fe, and 0.1% or less of the other elements, respectively. 0.5% by weight or less in total
An aluminum alloy clad material for high-temperature molding, characterized by being clad with a coating material, which is contained below and is made of an alloy whose balance is substantially Al. 4. 0.5 to 7.5% by weight of Mg as an essential element
Of Cu, 0.01 to 0.5 wt% of Cu and / or 0.02 to 2.5 wt% of Zn, and Cr
0.03 to 0.55 wt%, Mn 0.03 to 2.5 wt%, Zr 0.03 to 0.25 wt%, Ti 0.005 to
1 selected from the group consisting of 0.35% by weight, 0.03 to 0.5% by weight of Fe, and 0.03 to 1.5% by weight of Ni.
One or both sides of the base material containing at least one element or two or more elements, and the balance being substantially Al, contains Si 1 wt% or less, Fe 1 wt% or less, and Cu 1 wt% or less, and other 0.1% by weight of each element
An aluminum alloy clad material for high-temperature molding, characterized in that the coating material is made of an alloy having a total content of 0.5% by weight or less and the balance being substantially Al.