The alloy system aluminum-manganese and the product of this alloy

 

The invention relates to metallurgy, in particular to alloys based on aluminium system Al-Mn, for the production of cold-rolled sheets used for subsequent cold forming into articles of complex shape, such as vessels, tanks, banks and others, including welded construction. Proposed alloy and product thereof containing the following components, wt.%: manganese 0.3 to 1.5, iron 0.05 to 0.9, the Nickel and/or cobalt, 0.001 to 0.3, and at least one element from the group including titanium, chromium, zirconium, scandium, vanadium, molybdenum, hafnium, boron or carbon 0,00001-0,35, aluminum else, with Mn/Fe>l, Mn/(Co and/or Ni)2. In the cases of the invention it may be in the form of a vessel, heat exchanger, or as part of banks for storing drinks. The technical result of the invention is the decrease in the anisotropy of mechanical properties of thin cold-rolled sheets, as well as increasing their strength properties and plasticity, expanding the range of manufactured products, reducing the complexity of their production, increase the service life of the products, increasing the yield by cold stamping or deep drawing. 2 S. and 4 C.p. f-crystals, 2 tab.

The invention relates to the ists, used for subsequent cold forming into articles of complex shape, such as vessels, tanks, banks and others, including for welded structures.

The alloys of the system Al-Mn widely used in various industries due to its good corrosion resistance and the possibility of soldering.

This is primarily domestic alloys AMC, AMCs, MM, D12, as well as their foreign counterparts.

In the patent US 2001032688 disclosed alloy system aluminum-manganese, containing the following components, wt.%: Silicon - 0.05-0.5 - Iron 0.05 To 1.0 Manganese, Up to 2 Zinc - 0.1 Nickel - 0.1 Magnesium - 0.1 Copper - 0.5 Chromium - 0,03-0,5 Titanium - 0,03-0,35
Aluminum - Rest
the ratio Mn/Fe=2-6, a Cr/Ti=0,25-2,0.

This alloy is made in the form or round solid or round hollow ingot for subsequent extrusion and has a high resistance to intergranular corrosion and is designed for the manufacture of heat exchanger tubes by extrusion.

The disadvantages of this alloy can be attributed to the fact that it may not be the product of complex shape by cold forming thin sheets.

Guest 4784-97 disclosed alloy system aluminum-manganese for the production of thin sheets (AMC), containing the following components, wt%:
BAP is real.

The disadvantages of this alloy are high anisotropy of mechanical properties, and not enough high values of ductility and strength, that during the subsequent cold pressing thin sheets leads to the appearance of microreserves, reduces the service life of the product limits the range of manufactured products and increases the complexity of their manufacture.

The objective of the invention is to reduce the anisotropy of the mechanical properties of thin cold-rolled sheets, as well as increasing their strength properties and plasticity, which expands the range of manufactured products, reduces the complexity of manufacture, increases the service life of the product, increases the yield by cold stamping or deep drawing.

The problem is solved in that the alloy system aluminum-manganese for the production of thin sheets containing manganese, iron and modificarea additive additionally contains Nickel and/or cobalt, and as a modifying additive is at least one element selected from the group comprising titanium, chromium, zirconium, scandium, vanadium, molybdenum, hafnium, boron, or carbon in the following ratio, wt.%:
Manganese is 0.3 to 1.5
Iron is 0.05 to 0.9
Nickel and/or who, vanadium, molybdenum, hafnium, boron, or carbon - 0,00001-0,35
Aluminum - rest
when the ratio of Mn/Fe>1, MP/(Co and/or Ni)2.

In private embodiments of the invention the task is solved in that the alloy further comprises at least one element selected from the group consisting of magnesium, copper and zinc in the amount of 0.03 to 1.5%.

The task is also solved by the product, made of a thin sheet of the proposed alloy.

The product may be a vessel or part of the heat exchanger or at least one part of banks for storing drinks.

The invention consists in the following.

In the known alloys dissolved in the solid solution of aluminium, manganese and separated from it by the grain boundaries of the dispersed particle phase AlxMP (for example, Al6MP) increase the temperature at which recrystallization, impede the movement of small angle grain boundaries. Related to this is getting precrystallization fibrous structures in the leaves. During cold hardening deformation of leaves appear texture deformation. The direction of the fibers precrystallization patterns coincides with the grain direction of deformation. This leads to anisotropy of the properties of cold-rolled Al6MP. The concentration of manganese in the aluminum solid solution decreases, and the volume fraction of phase Al6MP is reduced. This leads to the lowering of the temperature of the beginning of recrystallization, facilitates the movement of small angle grain boundaries, and ultimately to obtain a fine-grained recrystallized structure. When hardening cold-formed appearance texture deformation in cold-rolled sheets of recrystallized structure does not create conditions for the occurrence of anisotropy of properties, so the material becomes isotropic.

Formed instead of the phase of Al6MP dispersed phase Al6MP (Co and/or Ni) stands in contrast to phase Al6MP is not at the grain boundaries and in the grain, creating a more solid solution hardening.

In addition, Co and/or Ni are part of the insoluble phase Al6FeMn, forming phase of Al6FeMn(Co and/or Ni). This new phase in contrast to phase Al6FeMn, having the form of a rough plate has a globular shape, which also increases ductility and strength and reduced anisotropy. The optimal structure contains at least 0.5% of the intermetallic compounds associated with Fe, Mn, Ni and/or Co.

The presence in the alloy of such elements as Ti, Cr, Zr, Sc, V, Mo, Hf, In, in decree what eformula, it allows you to increase the strength of these sheets and their plasticity.

The most favorable ratios for each of the listed components are the following:
Titanium - 0,008-0,25
Chrome - 0,003-0,35
Zirconia - 0,008-0,15
Scandium is 0.001 to 0.25
Vanadium is 0.001 to 0.15
Hafnium is 0.001 to 0.15
Molybdenum is 0.001 to 0.15
Boron is 0.0001-0.06 to
Carbon - 0,00001-0,01
The content of impurities in the alloy should not exceed the following values, wt.%: the lead of 0.05, cadmium 0.05, the bismuth 0.05, the tin of 0.05, potassium 0,05, sodium 0,05, lithium 0,05, calcium 0.05, the barium 0.05, the silicon 0,6, gallium 0.05, the hydrogen 2,5x10-5, beryllium 0,005, sulfur 0,005, fluorine 0.05, the cerium 0,05.

The elements Mg, Cu, Zn enter into solid solution, increase the strength of thin sheets without compromising the anisotropy of properties, and increase corrosion resistance and weldability.

All this leads to the production of cold-rolled sheets with a higher strength, ductility and low anisotropy, which leads to an increase of the service life of the products, the expansion of the product range manufactured from alloy products, reduces the labor involved in their manufacture.

Examples.

Cast slabs section h mm, whose chemical composition is given in table 1. The ingots homogenizeroWith a thickness of 6 mm Sheet thickness of 6 mm was annealed at a temperature of 450oC for 3 hours, then spent rolling on the thickness of 2.0 mm and then leaves again annealed at a temperature of 450oWith 3 hours and after surface preparation carried out the final cold deformation by rolling to a thickness of 0.29 mm, i.e. with the degree of over 85%. The mechanical properties of the sheets in equity and transverse directions are shown in table 2.

As can be seen from table 2, the proposed alloy in comparison with the known has strength properties above 15-20%, and the plasticity is higher by 30-40%.

In addition, the anisotropy of properties, defined as the difference between the properties in the longitudinal and transverse directions, we offer alloy 7-10 times lower than in the known.

Thus, the invention improves the mechanical properties and ductility of thin cold-rolled sheets, and also to reduce the anisotropy of their properties, which consequently allows to increase service life of products, to expand their range, reduce labor costs for the manufacturing of products.


Claims

1. Alloy based on aluminium for the production of thin sheets containing manganese, iron and modifying the add is at least one element, selected from the group comprising titanium, chromium, zirconium, scandium, vanadium, molybdenum, hafnium, boron, or carbon in the following ratio, wt.%:

Manganese 0.3 to 1.5

Iron is 0.05 to 0.9

Nickel and/or cobalt 0,001-0,3

At least one element from the group including titanium, chromium, zirconium, scandium, vanadium, molybdenum, hafnium, boron or carbon 0,00001-0,35

Aluminum Else

when this Mn:Fe>l, Mn: Co and/or Ni)2.

2. Alloy under item 1, characterized in that it further contains 0.03 to 1.5 wt.% at least one element from the group consisting of magnesium, copper and zinc.

3. The product from an alloy based on aluminum, made of a thin sheet, characterized in that it is made of alloy under item 1 or 2.

4. The product under item 3, characterized in that it is made in the form of a vessel.

5. The product under item 3, characterized in that it is made in the form of a heat exchanger.

6. The product under item 3, characterized in that it is performed as part of banks for storing drinks.

 

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