The method of processing of alloys of the aluminum-magnesium
(57) Abstract:The invention relates to metallurgy, in particular to methods for semi-finished products of aluminium-magnesium alloys. Proposed method of treatment, including cooling after hot rolling with a speed of 0.001 - 0,015oWith a/C, subsequently repeated cold rolling with intermediate annealing and final annealing, heating under which is conducted at a speed of not less than 2oWith a/C, exposure is carried out for 4 - 300 C and cooled at a rate not less than 0,5oWith a/C. In the case of obtaining a thin ribbon, the cooling at the last intermediate annealing in the process of repeated cold rolling is carried out with a speed of 0.001 - 0,015oC/S. the Method according to the invention provide improved corrosion resistance. 1 C. p. F.-ly, 1 table. The invention relates to metallurgy, in particular to methods for semi-finished products of aluminium-magnesium alloys.Method of heat treatment of aluminum-magnesium alloys, mainly used nowadays in industry, includes the operation of the final annealing comprising heating the alloy to a temperature above the temperature of the end of recrystallization (Tp With/h (0,033aboutC/C) (see "Production instruction map; PI.255-83, "Heat treatment of semi-finished products and parts from aluminum and aluminum alloys", S. 8). The disadvantage of this method is that this method is time-consuming and energy-intensive, and aluminum-magnesium alloys processed by this method have a high enough resistance to stress corrosion cracking.A method of processing aluminum-magnesium alloys, including hot rolling, cooling, multiple cold rolling with intermediate annealing, heating to a temperature of final annealing, exposure at this temperature and cooled adopted for the prototype (Industrial aluminum alloys. M. Metallurgy, 1984. The Handbook, edited by A. F. Belov and others). The disadvantage of this method is the complexity, power consumption. Aluminum-magnesium alloys processed by this method, have a reduced resistance to stress corrosion cracking corrosion and dissecting.We propose a method of treatment of the alloys of the aluminum-magnesium includes hot rolling, cooling, multiple cold rolling with intermediate annealing, heating to a temperature of final annealing, seperatory final annealing lead with speed of not less than 2aboutWith a/C, maintained at this temperature range 4-300 C and cooled at a rate not below 0.5aboutWith a/C. During repeated cold rolling after the last intermediate annealing cooling is carried out with a speed of 0.001-0,015aboutC/C to obtain thin sheets.The difference of the proposed method against known is that the cooling after hot rolling produce at the rate of 0.001-0,015aboutWith a/C. Heating to a temperature of final annealing is conducted at a speed of not less than 2aboutWith/with extract, the final annealing is 4-300 and with the cooling from the temperature of the annealing is conducted at a speed of not less than 0,5aboutWith a/C. During repeated cold rolling, after the last intermediate annealing cooling is carried out with a speed of 0.001-0,015aboutC/C to obtain thin sheets.The technical result of the proposed method is to increase the resistance to stress corrosion cracking and dissecting corrosion for alloys of the aluminum-magnesium and increase the life of the structures.The proposed mode allows you to create a structure with a uniform distribution of phases on the grain volume. Uniform distribution-phase leads to a uniform protein sow, that provides increased resistance to stress corrosion cracking corrosion and dissecting.Cooling after hot rolling and intermediate annealing before the final stage of cold rolling at speeds less than 0,001aboutWith/with or larger than 0,015aboutWith a/C, heating and cooling to a temperature of final annealing at a speed less than 2 and 0.5aboutC/s, respectively, the duration of annealing with more than 300 leads to the selection-phase partially along the grain boundaries in the form of a solid film. This emphasis-phase localizes to corrosion processes and lowers resistance to stress corrosion cracking corrosion and dissecting.At exposure times of less than 4 to get a recrystallized structure, which contributes to the directed flow of corrosion processes and reduces the resistance to stress corrosion cracking corrosion and dissecting.The upper limit of the speed of heating and cooling is determined by the technical capabilities of the equipment.Examples of the method.Ingots size HH mm of alloy AMg6 and AMg5 was heated to 400aboutWith, spent the hot rolling, and then received the 60% to a thickness of 2 mm and was heated to a temperature of final annealing of this alloy 310aboutWith different speeds, kept at the temperature of annealing different times and cooled at different speeds.Some ingots of alloy AMg5 got a thin strip of 1 mm with intermediate anneals (example 4). For comparison, sheets of alloy AMg6 were manufactured by a known method prototype.Tests on stress corrosion cracking was performed on samples by the method specified tensile loads according to GOST 9.019-74 at a voltage of 140 MPa.Tests on dissecting corrosion was carried out according to GOST 9.904-82.Comparative data on resistance to stress corrosion cracking, dissecting corrosion in the table.The table shows that the sheets are made on the proposed modes (examples 1-4), have the highest resistance to stress corrosion cracking, dissecting corrosion. This allows you to extend the life of structures made of alloys of the aluminum-magnesium 18-20% 1. The METHOD of PROCESSING of ALLOYS of the ALUMINUM-MAGNESIUM, including hot rolling, cooling, multiple cold rolling with intermediate annealing, heating to a temperature of final annealing, followed by exposure at this pace>the/C, heating to a temperature of final annealing is conducted at a speed of not less than 2oC/C and holding at that temperature 4 300 C, and a final cooling lead with a speed of not less than 0,5oWith/s2. The method according to p. 1, characterized in that the cooling after the last intermediate annealing during repeated cold rolling lead with speed 0,001 0,015oWith a/C.
FIELD: rolling processes and equipment, namely manufacture of armor sheets and plates of aluminum base alloys used in aircraft- and ship manufacture, for making armored transport vehicles and so on.
SUBSTANCE: method for making armor sheets and plates of aluminum base Al-Mg-Mn alloys with Mg content no less than 4 mass % comprises steps of hot rolling of ingot to plate and finish rolling of it; performing as finish rolling warm rolling at temperature 80 - 300°C with total deformation degree no less than 60%; preferably realizing warm rolling at temperature 250 - 290°C with total deformation degree 65 - 80%. Invention provides ballistic protection degree 738 - 742 m/s for plates with thickness 38.0 -38.2 mm at firing on with armor-piercing shells 7.62.
EFFECT: improved resistance against ballistic action due to constant strength and ductility values at high corrosion resistance, good welding capability and small mass.
4 cl, 3 dwg, 2 tbl, 2 ex
FIELD: metallurgy; methods of the thermal treatment of sheets and welded joints of the aluminum-magnesium-silicon alloys system.
SUBSTANCE: the invention is pertaining to metallurgy, in particular, to the methods of the thermal treatment of sheets and welded joints of the aluminum-magnesium-silicon alloys system. The method provides for heat hardening at the temperatures from 525-530°C with refrigeration in water and tempering. The tempering is conducted at the temperatures of 180-200°C with the time of aging for 1.0-3.5 hour. The technical result of the invention is reduction of duration of the heat treatment of the sheets and the details produced out of them by the cold stamping and also their welded joints.
EFFECT: the invention ensures reduction of duration of the heat treatment of the sheets and the details produced out of them by the cold stamping and also their welded joints.
FIELD: metallurgy of aluminum base alloys such as Al-Mg-Li-Cu system alloys used as constructional materials in aircraft making and spatial technology, transport machine engineering for making facing and inner reinforcing structures.
SUBSTANCE: alloy contains next ingredients, mass %: lithium, 1.5 - 1.9; magnesium, 1.2 - 3.5; copper, 1.4 - 1.8; zinc, 0.01 -1.2; manganese, 0,01 - 0.8; titanium, 0.01 -0.25; silicon, 0.005- 0.8; cerium, 0.005 -0.4; at least one element selected from group including scandium, 0.01 - 0.3; zirconium, 0.003 - 0,15; beryllium, 0.001 - 0.2; aluminum, the balance. Method for heat treatment of alloy comprises steps of quenching, straightening and artificial aging according to three-step mode. Quenching is performed from temperature 510 - 535°C. First step of artificial aging is realized at temperature 95 - 120°C. In concrete variants of invention second step of aging is realized at temperature 130 -180°C for 3 - 25 hours. Third step of artificial aging is realized at temperature 95 - 120°C for time period 15 h and more. Invention provides enhanced strength and thermal stability of alloy after heating at 85°C for 100 h while keeping high viscosity of rupture and technological plasticity of alloy at making thin sheets by coil rolling.
EFFECT: improved strength and thermal stability of alloy.
3 cl, 4 tbl, 1 ex
FIELD: nonferrous metallurgy.
SUBSTANCE: invention is intended for use in metallurgy, mechanical engineering, and aircraft industry, in particular for manufacturing honeycomb structures. Alloy is composed of, wt %: magnesium 8-10, manganese 0.1-0.15, zirconium 0.15-0.2, cobalt 0.05-0.2, boron 0.005-0.007, beryllium 0.001-0.02, iron 0.15-0.2, silicon 0.15-0.2, titanium 0.1-0.2, aluminum - the balance. Ingot for manufacturing structural foil is obtained by semicontinuous casting in rotary crystallizer at volumetric cooling 4-20°C/sec. Structural foil manufacturing process comprises homogenization, hot rolling, annealing, cold rolling followed by annealing in air atmosphere, second cold rolling followed by annealing, and final cold rolling.
EFFECT: increased strength of alloy at ambient and elevated temperatures and improved processability un rolling stage.
3 cl, 3 tbl
FIELD: foundry and rolling processes.
SUBSTANCE: structural material contains following components, wt %: magnesium 9.0-11.0, zirconium 0.15-0.2, cobalt 0.01-0.001, beryllium 0.001-0.02, boron 0.005-0.007, aluminum - the balance. Crystallization of melt is carried out in rotary crystallizer at gravitation coefficient 220-250 and melt lifetime 12-15 sec/kg. Ingot is first heated for 2-4 h at 340-380° C and then subjected to hot rolling at that temperature until thickness 4-8 mm is attained at deformation rate up to 30% in each cycle and final rolling temperature 310-330° C. Thereafter, cold rolling is effected with deformation rate up to 50% in each cycle and intermediate annealings for 0.5-2.0 h at 310-390° C until required thickness 0.5-2.0 mm is attained followed by final annealing of rolled metal for 5-40 min at 400-450° C.
EFFECT: increased strength, plasticity, and processability of aluminum-based alloy with 9-11% magnesium.
2 cl, 2 dwg, 1 tbl
SUBSTANCE: said utility invention relates to Al-Zn-Mg alloys, namely, to alloys for welded structures, such as structures used in marine construction, during manufacture of car and industrial vehicle bodies, and stationary or movable tanks. The method involves manufacture of a plate using semi-continuous casting. The plate is made of an alloy containing, % weight: Mg 0.5-2.0, Mn < 1.0, Zn 3.0-9.0, Si < 0.50, Fe < 0.50, Cu < 0.50, Ti < 0.15, Zr < 0.20, Cr < 0.50, aluminium with its inevitable impurities being the remaining, Zn/Mg > 1.7. After that, the plate is subjected to homogenisation and/or reheating at a temperature T1 selected so that 500°C ≤T1≤(Ts-20°C) where Ts is the alloy burning temperature. The first hot rolling stage includes one or several rolling passes on a hot-rolling mill, the input temperature T2 is selected so that (T1-60°C)≤T2≤ (T1-5°C), and the rolling process is performed in such a way that the output final temperature T3 would be so that (T1-150°C)≤T3≤(T1-30°C) and T3 < T2. The strip produced at the said first hot rolling stage is rapidly cooled to the temperature T4. The second stage of hot rolling of the said strip is performed at the input temperature T5 selected so that T5≤T4 and 200°C≤T5≤300°C. The rolling process is performed in such a way that the coiling temperature T6 would be so that (T5-150°C)≤T6≤(T5-20°C).
EFFECT: enhancement of balance between mechanical properties and corrosion resistance of base metal and welded joint using simplest and most reliable method.
34 cl, 8 dwg, 20 tbl, 10 ex
FIELD: metallurgy industry.
SUBSTANCE: invention refers to metallurgy, and namely to methods of producing superductile plates from aluminium alloys of aluminium-magnesium-lithium system, and can be used for superductile moulding of complex-shaped parts, as well as structural material when producing extruded sections. From an ingot there made is a half-finished article in the form of a cylinder. Hardening is carried out at 460±10°C during 0.5 hour. After that the half-finished article is extruded in intersecting channels with diameter corresponding to diameter of half-finished article deformed with a shear at the temperature of 300-400°C with accumulated deformation degree e=10. Rolling is carried out at the temperature of 330-370°C.
EFFECT: producing plates with high homogeneity of mechanical properties and improved superductility indices at low temperatures and high metal flow rates.
1 tbl, 1 ex
SUBSTANCE: there is received constructional material from alloy on the basis of aluminium, containing components at following ratios, wt %: magnesium 10.50-15.50, manganese 0.05-0.10, zirconium 0.01-0.15, titanium 0.09-0.15, silicon and iron not more than 0.08, aluminium is the rest. Crystallisation of melt is implemented in rotary crystalliser at gravitation coefficient, equal to 180-250, during time of melt existence, equal to 12-15 s/kg, and cooling rate not higher than 5°C/s. Ingot is thermal treated and rolled. At first it is heated during 2-4 hours at temperature 340-380°C, then at that temperature is implemented its hot rolling up to thickness 4-8 mm at a degree of deformation in each cycle up to 30% and final temperature of semi-finished rolled products in the range 310-330°C. Then it is implemented cold rolling of semi-finished rolled products at a degree of deformation in each cycle up to 50% with intermediate softening during 0.5-2.0 hours at tempearture 310-390°C up to required thickness 0.5-2.0 mm and it is implemented finish annealing of rolling during 5-40 minutes at temperature 400-450°C.
EFFECT: increased durability, plasticity and manufacturability of rolling.
2 dwg, 2 cl
SUBSTANCE: melt is overheated to a temperature of 760-800 °C with an exposure of 0.5-1.0 h, a billet is cast by continuous casting into the slide mould, the billet is annealed at a temperature of 360-380 °C for 3-8 h, production of a rectangular billet out of a square bar in the ratio of thickness to width ratio from 0.17 to 0.33. This is followed by deformation resulting from a bar of the billet using equal-channel angular pressing at an angle of channels intersection of 90 °C at a temperature of 305-325 °C with the number of passes of 8 to 10, which corresponds to a true deformation of 8 to 10, with back pressure equal to 40-50% of the applied pressure, and rotating the billet after each pass per 90 ° about the axis perpendicular to a bigger face of the billet, and passing through the centre of the billet. After the deformation of the billet using an equal channel angular pressing, cold rolling is carried out with a total compression of 75-80%, or cold rolling with a combined compression 80-95% followed by annealing at a temperature of 305-335 °C for 0.5-1.0 h with cooling to room temperature with a rate of 15-35 °C/h.
EFFECT: deformed billets with high mechanical strength while maintaining flexibility.
1 tbl, 1 ex
SUBSTANCE: plate of 10 mm thickness or larger from aluminium alloy features higher durability. Note here that said aluminium alloy has the following chemical composition with the following components, in wt %: Mg 4.0-6.0, Mn 0.2-1.4, Zn not over 0.9, Zr < 0.3, Cr < 0.3, Sc < 0.5, Ti < 0.3, Fe < 0.5, Si < 0.45, Ag < 0.4, Cu < 0.25, other elements and unavoidable impurities of each aforesaid element - <0.05, sum - <0.20, aluminium making the rest. Plate features elongation in L direction exceeding 10% and tensile strength making, t least, 330 MPa. Proposed plate is produced by casting, preheating and/or homogenising, hot rolling, first cold forming, annealing at less than 350°C, and second cold forming.
EFFECT: higher resistance to kinetic projectiles, better formability.
27 cl, 3 dwg, 2 tbl, 2 ex