JPS62158033A - Al-mg base alloy ply metal having high strength and excellent bending workability - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an Al-Mg based alloy laminate having high strength and excellent bending workability.

[Prior Art 1 Conventionally, Mg is used as an aluminum alloy for forming process.
．． Al-Mg based alloy (5052) containing 4 to 7 t%
, 5154, 5182, X5090, etc.) have been put into practical use.

However, although these aluminum alloys have excellent formability (stretchability) in relation to their strength, the inner bending radius for 180° bending is only 0.7 at best.
It is 5L.

Recently, aluminum alloys have become more popular due to their light weight.
It has been used for various parts of automobiles, but especially for panels such as hoods, caulking is often performed by digging in the inner layer with an actor to increase rigidity. At this time, cracks occur due to the 180° bending of the 7 outer material, resulting in a decrease in caulking strength.
It is often not used because the shape freezes to a small extent, which makes it look unsightly, and there are concerns about long-term durability. Furthermore, it has a strength level comparable to that of mild steel plate (σ = 30 kg/mm2
) There is a growing demand for an aluminum alloy that can be bent 180'' closely.

[Problems to be Solved by the Invention] The present invention has been made in view of the problems of conventional aluminum alloys as explained above, and as a result of repeated research by the present inventor, it has been found that , Al-Mg with an inner bending radius of O1, that is, 180″ close bending process is possible.
They developed an alloy laminated plate.

[Means for Solving the Problems 1] The Al-Mg-based alloy laminate plate of the present invention, which has high strength and excellent bending workability, is characterized by containing 3 to 10% Mg, and , Cu2wL% or less, Mn 0.8u+t% or less, Cr
0.5wt% or more, Fe 015wt% or less, Si 0
．． 5wt% or less, Zr 0.3wt% or less, V 0.3
wt% or less, Nb 0.3wt% or less, Ni 0.5w
t% or less, Co 005wt% or less, Mitshu Metal (
MoM, ) 0.5wt% or less, Ti 0.31ut
%lu, B 0006u+t%, and the impurities include Pb, Bi, Sn, Sb, Zn, etc. alone at 0.3 wt% or less, and the remainder is Al. The core material is an aluminum alloy made of aluminum, and the skin material is made of aluminum with an Al purity of 99.0 wt% or more, and the thickness of the skin material is 5 to 20% of the total plate thickness on one side.
This means that one or both sides of the core material are coated.

The Al-Mg-based alloy laminate plate having high strength and excellent bending workability according to the present invention will be described in detail below.

First, the Al-
The core material and skin material of the Mg-based alloy laminate will be explained.

(1) Regarding the core material.

The core material is an aluminum alloy containing 3 to 10 wt% Mg.

Mg is an element that improves strength, and the content is 3wt%
If the content is less than 10 wt%, the strength will be low, and if the content exceeds 10 wt%, Mg will be oxidized during melting, and rollability and bending workability will be reduced. Therefore, the Mg content is 3~
It is set to 10u+t%.

Although Cu has the effect of improving strength, it reduces bending workability, rollability, and castability, so Cu is used to adjust material properties.
The Cu content is 2.0 wt% or less.

Mn5Or, Fe, Si, Ni, Co, Mitsui
Tal (M, M,), Zr, ■, Nb, effective in adjusting crystal grains, improving rollability and strength after general II tempering treatment, Mn 0.8wt%, Cr, Fe, S
i, Ni, Co, and M, M, content is 0.5
When wL%, Zr, V and Nb are contained in excess of 0.3u+L%, the above effects are saturated, and on the other hand, the rolling properties are reduced.

Therefore, the Mn content is 0. ht% or less, Cr, Fe.

The content of S;, N:, Co and M6M is 0.5+u
t% or less, Zr, Nb, ■ content is 0.3u+L%
The following shall apply.

Ti has a general grain refining effect in iyL, and the effect is saturated when the content exceeds 0.3 wt%, so Ti
The content shall be 0.3111% or less.

B generally exhibits a additive effect with Ti, and B has the effect of refining the crystal grains of agglomerates, and the effect is saturated when the content exceeds 0.06 u+t%. Therefore, the B content is set to 6 wt% or less.

Note that Ti and B are Al-Ti, AIB, or Al-Ti
It is better to contain the impurity elements Pb, Bi, Sn and Z in the pond by intermediate alloys such as -B.
The content of n is 0.0 to 0.00000 within a range that does not impair castability and rollability. It should be less than wt%.

(2) Regarding the leather material.

In order to improve the bending workability of the core material, the Al purity is 99. Qu
It% or more of aluminum is used as the skin material. Then, Fe5Si, Mg, Zn, Cu is added to this aluminum.
SNi%Cr, Co, M, M,, Zr.

(2) When elements such as Nb, Pb, Sn%Bi%Sb, etc. are contained, bending workability decreases in proportion to the content. Each of these elements is restricted to 0.75 wt % or less, and if the total amount exceeds 1 ust %, the bending workability will be significantly reduced.

Therefore, the content of these elements alone is 0.75wt
% or less, and the total amount must be regulated to 1 wt% or less.

Furthermore, Ti has a general grain refining effect in ingots, and the effect is saturated when the content exceeds 0.3 wt%, so it is kept at 0.3 Illt% or less, and B is generally Ti.
It has the effect of refining the crystal grains of the S lump due to the additive effect with S, and if the content exceeds 0.06 wt%, the effect is saturated, so the content should be 0.06 wL% or less. In addition, Ti and B are A
It can be contained in intermediate alloys such as ITi, AtB, AI, and Ti-B.

Therefore, the skin material is Fe, Si, Zn, Cu, Ni
, Cr, Co, Zr, V, Nb, Sb, B15Sn,
Pb, MoM.

is regulated to 0.75wt% or less individually and 1ust% or less in total, Ti is regulated to 0.3u+L% or less, B 0.06u+
t% or less, and the Al purity is 99. Quit% or more of aluminum is used.

(3) Regarding the coverage rate of the skin material.

The coverage rate of the skin material has an important relationship with the material strength and bending workability, and the coverage rate should be 5 to 20% on one side of the total plate thickness.If it is less than 5% on one side, the decrease in strength will be small, but bending workability will be reduced. There is no improvement in the properties of the skin, and damage to the skin material may occur during the recent rolling process of laminated boards.
If it exceeds %, the bending workability will be good, but the strength will be significantly lowered. Therefore, the covering rate of the skin material depends on the strength and 18o
.

5 per side for the entire plate thickness due to the balance of bending workability.
It is preferable to set it to 20%.

[Example] Next, the Al-
Examples of Mg-based alloy composite plates will be described.

Example 1 Table 1 shows Al having high strength and excellent bending workability according to the present invention.
-' Shows the components and component ratios of the MgMg-based alloy and comparative alloys.

This alloy is melted → bonded → surface milled → heated or homogenized →
Hot rolling (rolling of laminated plates and rolling of core material only) → cold rolling →
A final heat treatment (thermal treatment) was performed to obtain the high strength and bending workability according to the present invention of 1. On+n+ (both sides of the core material were coated with skin material at a rate of 10% on one side of the laminated board). Al-
Table 2 shows the results of investigation on tensile strength and 180° close bending limit of Mg-based alloy laminated plates, comparative plates, and core-only plates.

As is clear from Table 2, the AI-Mg-based alloy composite plate according to the present invention, which has high strength and excellent bending workability, has 180° bending workability compared to comparative materials and sheets with only core material. It can be seen that the material is excellent and has high strength.

Example 2 The core material (C-5) and skin material (S-2) shown in Example 1
), melting → casting → homogenization → facing → heating (up to hot rolling temperature) → hot rolling (including laminated plate rolling) → cold rolling → final heat treatment, and the total plate thickness is 1. Table 3 shows the results of an investigation regarding the coverage, tensile strength, and 180° close bending of a laminated board coated on both sides with On+m and one-sided coverage of 0 to 25%.

The following is clear from Table 3.

(1) There is no decrease in strength when one side coverage is less than 5%, but 1
Cracking occurs when bending closely at 80°.

(2) When the coverage becomes 25%, the 180° close bendability improves, but the tensile strength decreases to about 70% of that of the core material alone.

(3) Therefore, when the covering ratio of the skin material is in the range of 5 to 20% per side, the tensile strength is high and the 180'' tight bendability is also excellent.

Example 3 Core materials shown in Table 1 (C-2, C-10, C-18, C
-19) and skin material (S-5), melting → casting → homogenization → facing → heating (up to hot rolling temperature) → hot rolling → cold rolling to improve rollability and 180°C bending. We investigated gender.

The results are shown in Table 4.

As is clear from Table 4, when the Mg content becomes lht%, the rollability decreases, and even if rolling is possible, the bendability is poor and necking occurs.

C-1, C-19...Comparative materials.

Table 2 (2) Table 3 Table 4 Hot rollability and cold rollability ○: Good, Δ: Fairly good, X: Not coated during co-rolling, cold rollability is poor when coated.

180°adhesive bendability ○: No cracking, Δ: Narrowing, ×: Cracking.

[Effect of the invention 1] As explained above, the AI-M8 base alloy laminated plate of the present invention, which has high strength and excellent bending workability, has the above structure, so it has high strength and can be bent at 180° in close contact. Therefore, it can be widely used in automobiles and other general vehicles, electrical equipment, etc.

Claims (1)

[Claims] Contains Mg3 to 10wt%, and Cu2wt% or less, Mn0.8wt% or less, Cr0.5
wt% or less, Fe0.5wt% or less, Si0.5wt%
Below, Zr 0.3wt% or less, V 0.3wt% or less, N
b0.3wt% or less, Ni0.5wt% or less, Co0.
5wt% or less, misch metal (MM) 0.5wt
% or less, Ti 0.3wt% or less, B 0.06wt% or less, and as impurities, Pb, Bi, Sn, Sb, Zn, etc. alone contain 0.3wt%. % or less, and the balance is Al, the core material is aluminum alloy, and the skin material is aluminum with an Al purity of 99.0 wt% or more, and the thickness of the skin material is 5 to 20% of the total plate thickness on one side.
An Al-Mg-based alloy laminate with high strength and excellent bending workability, characterized by having a core material coated on one or both sides.