Welded aluminium alloy for armoured skin

FIELD: metallurgy.

SUBSTANCE: welded aluminium alloy contains, by wt %: zinc 3.8-5.3; magnesium 1.2-2.0; manganese 0.91-1.3; chrome 0.12-0.40; zirconium 0.07-0.15; copper 0.10-0.30; iron ≤ 0.35; silicium ≤ 0.35; vanadium 0.01-0.12; boron 0.01-0.12; nickel ≤ 0.05; calcium ≤ 0.05; aluminium - the rest, at the total contents of zinc and magnesium 5.0-7.3 by wt % and the ratio between the contents of zinc and magnesium - 1.90-4.58.

EFFECT: creation of welded aluminium alloy for the armoured skin, which provides at a high corrosion stability of the armoured skin, increase of safe level increase of resistance to formation of back chips.

1 ex

 

The invention relates to the metallurgy of aluminium semi-finished products, namely metallurgy of welded aluminum alloys of the aluminum - zinc - magnesium, and may find application in the manufacture of a homogeneous or layered armor plates for brokeness and broncobuster objects.

Known welded aluminum alloy armor for containing zinc, magnesium, manganese, chromium, titanium, zirconium, copper, iron, silicon, impurities and aluminum, which when the total content of zinc and magnesium from 6.4 to 7.4 wt % and the content of zinc to magnesium content to 2.57-3,67 contains components in the following ratio, wt. %:

zincthe 4.9 to 5.5
magnesiumof 1.5-1.9
manganese0,2-0,5
chrome0,15-0,25
titanium0,03-0,10
Zirconia0,07-0,12
copper0,10-0,20
iron≤0,35
silicon≤0,25
the other item is imesi ≤0,1
aluminumrest

(EN 2349664, C21C 21/10 published 20.03.2003, EN 2371660, C21C 21/10 published 27.10.2009.)

Known welded aluminum alloy has a high bronwyne properties, wealthy in zinc and magnesium and their ratio. However, in harsh environments armour designs when exposed to corrosive environments and significant tensile and/or alternating loads welded connection of the known welded alloy does not have sufficient corrosion resistance, in particular resistance to the emergence and spread of corrosion cracks. In addition, high strength properties, the armor of the known alloy is prone to the formation of the back bruised when exposed to modern means of destruction. This leads to restrictions on the use of known alloy as armor: mainly composed of layered armor with additional corrosion protection on the outside and back bruised from the inside of bronekorpus.

Known welded aluminum alloy armor for containing zinc, magnesium, manganese, chromium, titanium, zirconium, copper, iron, silicon, impurities and aluminum, which when the total content of zinc and magnesium 5,8-7,8 wt. % and the ratio of zinc content to the content of magnesium 1,95-4,2 soda is separated components in the following ratio, wt. %:

zinc4,5-5,5
magnesium1.3 to 2.3
manganese0,2-0,7
chrome0,12-0,40
titanium0,03-0,12
Zirconia0,07-0,15
copper0,10-0,30
iron≤0,35
silicon≤0,35
impurities≤0,05 individually
and ≤0.15 in the amount of
aluminumrest

(EN 2447392, published on 10.04.2012.)

This aluminum alloy also does not have sufficient corrosion resistance, in particular resistance to the emergence and spread of corrosion cracks. In addition, high strength properties, the armor of the known alloy is prone to the formation of the back bruised when exposed to modern means of destruction. This limits the applications of the known alloy as armor: mainly composed of layered armor with additional corrosion protection on the outside and back bruised from the inside of bronekorpus.

Known welded aluminum alloy armor for containing zinc, magnesium, manganese, chromium, titanium, zirconium, copper, iron, silicon, impurities and aluminum, which when the total content of zinc and magnesium 5,8-7,8 wt.% and the ratio of zinc content to the content of magnesium 1,95-4,2 contains components in the following ratio, wt.%:

zinc4,5-5,5
magnesium1.3 to 2.3
manganese0,2-0,7
chrome0,12-0,4
titanium0,03-0,12
Zirconia0,07-0,15
copper0,10-0,30
iron≤0,35
silicon≤0,35

other impurities

(calcium, sodium,

Nickel)≤0,05 individually and ≤0.15 in the amount of
aluminumrest

(EN 2447392, published on 10.04.2012.)

Dan is the first aluminum alloy also does not have sufficient corrosion resistance, in particular, resistance to the emergence and spread of corrosion cracks inclined to the formation of the back bruised when exposed to modern means of destruction.

The closest in composition of the components is welded aluminum alloy containing zinc, magnesium, manganese, chromium, zirconium, copper, iron, silicon, vanadium, boron, titanium, and other elements in the following ratio, wt.%:

zinc3,5-6,0
magnesium2-3,0
manganeseof 0.3-0.9
chrome<0,4
Zirconia<0,45
copper<0,3
iron<0,35
silicon<0,3
vanadium<0,15
Bor<0,1
titanium≤0,2
other elements≤0.05 and <0.15 in total
aluminumrest

(CN 101914710 A, C22C 1/02, C22C 21/10 published 15.12.2010.)

Strength armor alloys and, accordingly, breastaurant made with their use of homogeneous armour plate (made of metal of the same chemical composition) increases with the total content of the main alloying components (zinc + magnesium). However, with the growing strength of the alloy at the expense of such alloying decreases its ductility. The lack of ductility of the alloy is manifested in the form appearing on the plates back bruised when their trials by fire.

In the alloys of the system Al-Zn-Mg, intended for the manufacture of homogeneous armor plate, the total content of the main alloying elements (zinc and magnesium) does not exceed 7-8 wt %, which corresponds to the Brinell hardness 1500-1600 MPa (strength σin=48-50 kg/mm2) and relative elongation (ductility) δ=6-8%. This combination of strength and plasticity provides maximum breastaurant of alloys of the system Al-Zn-Mg when used as armor to protect from bullets 5.45-12,7 mm

The increase in caliber weapons will require improving the ductility of the alloy and, therefore, the reduced level of doping. So, to protect against caliber shells 20-30 mm indicator of plasticity, providing the second highest level of breastaurant, must be at least 8-12%, which corresponds to the hardness 1300-1400 MPa.

A distinctive feature of semi-finished products and, especially, the welded joints of the alloy system Al-Zn-Mg is an increased tendency to stress corrosion cracking (CR) under the action of tensile stresses, especially in the high corrosiveness of the environment.

Resistance to stress corrosion cracking is characterized by a maximum stress (σKR), where the metal (welded connection) is not subject to destruction during long-term exposure to corrosive environment.

The value of σkrmainly depends on the total content of the main alloying elements (∑Zn+Mg). So, for plates of alloy 1903 (∑(Zn+Mg)average=7,4%) σKR=100 MPa; for plates of alloy 1903A (∑(Zn+Mg)average=6.9 wt %), and according to the chemical composition and alloy 7039 (∑(Zn+Mg)average=to 6.8 wt %) σKR=250 MPa, and for welded joints, respectively, 75 and 160 MPa.

However, such values of σKRnot sufficient to ensure satisfactory operational reliability of welded structures under their long-term operation in corrosive environments, because the residual stresses in the zone of welded joints in plate thickness of 40 mm can reach values of more than 160 to 180 MPa, and in the presence of oxygen is the operators of stress they can significantly increase. Probably for this reason, repeated attempts to use the plates of alloy 7039 (USA) as the reservation for floating APC failed (due to poor durability of welded structures - machine body to stress corrosion cracking).

The aim of the invention and its technical result is the creation of a welded aluminum alloy armor, which provides high corrosion resistance armor improving the safe stress - σKR(resistance to stress corrosion cracking), increased resistance to the formation of the back bruised both alloys and welded joints.

The technical result is achieved by the fact that the welded aluminum alloy armor contains zinc, magnesium, manganese, chromium, zirconium, copper, iron, silicon, vanadium, boron, Nickel, calcium and aluminum, and when the total content of zinc and magnesium of 5.0-7.3 wt % and the content of zinc to magnesium content 1,90-4,58 it contains components in the following ratio, wt. %:

zinc3,8-5,3
magnesium1,2-2,0
manganese0,91-1,3
chrome 0,12-0,40
Zirconiaof 0.07-0.15
copper0,10-0,30
iron≤0,35
silicon≤0,35
vanadium0,01-0,12
Bor0,01-0,12
Nickel≤0,05
calcium≤0,05
aluminumrest

To ensure maximum durability plates of alloy and obreteniyu and its welded joints to stress corrosion cracking optimal total content of zinc and magnesium is about 6 wt.% at the optimum ratio of zinc to magnesium of about 3.1.

The invention can be illustrated by the following example.

Armour plates of the alloy according to the invention or of laminated plates using alloy for the back layer of the armor plate is made according to a standard technique. Manufacture of solid armor plate includes: casting ingots, homogenization annealing, cutting into the slab, hot rolling the slab at the slab of a given thickness is, hardening, straightening, artificial ageing plates for maximum strength (status T1), cutting of plates in specified dimensions, carrying out control tests.

For comparative evaluation used a homogeneous armour plate thickness of 40 mm and thickness 3 mm alloy 1903A and alloy according to the invention.

Research metallographic, mechanical and corrosion characteristics comparable alloys showed the advantage of the alloy according to the invention, including the likelihood of education bruised back. Similar results should be expected for welded joints compared alloys (welding wire svmg) without heat treatment after welding.

The safe levels of stress σKRfor a known alloy A is 250 MPa, and for his welds - 160 MPa. For the alloy according to the invention the safe levels of stress σKRyou should expect at the level of 330 MPa, and for his welds - 210 MPa.

Thus, the use of the alloy according to the invention will increase the level of armour properties of plates 5-6% due to the lack of a back bruised, as well as the safe levels of stress more than 30% as plates and welded joints with their use, which increases breastaurant and operational reliability broncobuster objects, especially when operating in regions with povyshen the th corrosive environment.

Welded aluminum alloy armor for containing zinc, magnesium, manganese, chromium, zirconium, copper, iron, silicon, vanadium, boron, Nickel, calcium and aluminum, characterized in that it contains components in the following ratio, wt. %:

zinc3,8-5,3
magnesium1,2-2,0
manganese0,91-1,3
chrome0,12-0,40
Zirconia0,07-0,15
copper0,10-0,30
iron≤0,35
silicon≤0,35
vanadium0,01-0,12
Bor0,01-0,12
Nickel≤0,05
calcium≤0,05
aluminumrest

the total content of zinc and magnesium is 5.0-7.3 wt.%, and the contents of zinc and magnesium - 1,90-458.



 

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1 tbl

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2 cl, 1 ex, 3 tbl

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EFFECT: improved and valuable property of alloy.

1 tbl

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