Method for manufacture of laminated material

FIELD: plastic working of metals, in particular, production of laminated materials.

SUBSTANCE: method involves providing blank of low-alloy two-component alloy; deforming blank at reduction extent of at least 80% and extension coefficient of at least 5; upon termination of deformation procedure, subjecting blank to thermal processing in direction oriented from its larger to smaller section and saturating with hydrogen at each stage of manufacturing laminated material. Blank used is cable blank with magnesian insulation.

EFFECT: increased deformability, improved corrosion and fatigue resistance of materials employed in various branches of industry.

5 cl, 4 dwg, 3 ex

 

The invention relates to the field of metal processing, namely, to methods for producing multilayer materials.

To create new machines and devices, intensification of technological processes necessary materials with high corrosion resistance and strength properties. Among such materials are clad material consisting of two or more metals or alloys steels (bimetals, trimetallic, laminated metals).

The bimetals are different from multi-layer materials that bi-metal materials between layers are metal bonding, and multi-layered materials are no such ties.

A known method of manufacturing a multilayer material according to which the workpiece of metal alloy is subjected to cold working pressure and carry out its plastic deformation (see Vagankov Processing parts plastic deformation", Tekhnika, Kiev, 1978, p.3).

When using this method there is a superficial plastic deformation of the workpiece by a special tool in the form of steel balls or rollers. Plastic deformation of the surface of a metal workpiece leads to stretching of the underlying metal layers. Due to the small thickness of the surface layer (19-23 µm) and a low degree of deformation elongation DNAs is Rennie layers is very small. However, due to work hardening of the surface layer increases the mechanical properties and increases the hardness of the metal alloy 1.2-1.3 times.

However, the above method of surface plastic deformation creates significant internal stresses in the surface layers of the metal pieces and makes it unsuitable for the manufacture of structures operating in harsh environments. Moreover, after the heat treatment or welding effect of surface plastic deformation is completely lost.

The closest to the invention is a method of manufacturing a layered material, which consists in the fact that the workpiece of metal alloy is subjected to cold working pressure and carry out its plastic deformation (see Miepoll and other "Bimetallic tubes", "engineering", M., 1974, SS-20, 98-112).

This method is used for the manufacture of bimetallic pipe of the two pipes made of different steel grades, one of which is inserted into the other and the joint is subjected to plastic deformation by rolling. This method provides improved connection of workpieces made of different steels or alloys, and, thereby, allows you to expand the scope, schedule and appointment made from these products.

However, this method is izgotovlenie layered materials also has a number of significant drawbacks. First, a very time consuming process for the preparation of the mating surfaces of the two workpieces. Secondly, despite the thorough preparation of the mating surfaces of the connection parts in the solid product is low due to delamination of incomplete fusion, etc. thirdly, when welding are formed, the so-called border zone, which is a waste of metal. Fourthly, waste metal also results in the removal of the "allowance" of metal due to oxidation of its surface under the influence of the environment. Fifthly, when connecting different metal alloys or steels are formed electrochemical couples and, as a consequence, catastrophically rapid destruction obtained with this method of production.

The technical result, which directed this invention is to increase the deformation capacity and the resistance used in the industry of materials to corrosion and fatigue failure.

This technical result is achieved due to the fact that the applied method of manufacturing a layered material, which consists in the fact that the workpiece of metal alloy is subjected to cold working pressure and carry out its plastic deformation, used for preparation of low-alloy two-component alloy and the secure strain with a degree of compression of not less than 80% and with a drawing ratio of at least 5, furthermore, because after the cessation of deformation of the workpiece is subjected to heat treatment and processing of procurement spend from a great cross-section to a smaller, but also because the workpiece is saturated with hydrogen before the cold pressure treatment and/or during cold working pressure and/or before heat treatment and/or during heat treatment, and, in addition, because as blanks use cable preparation with magnesia insulation.

Example No. 1 of the complete method.

Take the tube blank from dvukhkomponentnogo low-alloyed zirconium alloy, for example, e-110 [ zirconium (Zr) - 98%, niobium (Nb) - 1%, the rest - less than 1%. TU 95 2594/96 from 23.01.96. Tubes made of zirconium alloys for fuel elements (Fe)], with a diameter of 12.0 mm with a wall thickness of 1.0 mm and subjecting it to cold working pressure, for example, cold periodic rolling feed of 0.2 mm, up to 5,0×0.45 mm, which corresponds to the degree of compression, equal to 82.6%, and the drawing ratio equal to 5. When rolling arise tensile strain and shear, which leads to more superficial layers (volumes) of the workpiece occur tensile forces. Due to the tensile load is crushing the crystal structure of the metal, and the thickness of the blank forms fur is systematic heterogeneity, as a result of which appear aimed diffusion of alloying elements and counter them flows of vacancies that cause changes in the chemical composition and "stratification" of the alloying elements in the billet.

During rolling, as with other methods of deformation, the metal billet becomes inhomogeneous, i.e. in the amount of metal formed separate zones, which are the internal energy and different concentrations of dislocations and vacancies. Diffusion processes of redistribution of alloying elements in the workpiece can be strengthened by subjecting the workpiece after the cessation of deformation heat treatment. For example, to activate the process of "splitting" of the alloying elements, after deformation of the billet of alloy e-110 carry out its annealing with slow heating at a rate 3-4°/min to a temperature of 600°in a furnace at a vacuum of not less than 1×10-5mm Hg Maintain the workpiece at this temperature for 6 hours, then cooled with a rate of 2-3°/min

In addition, the degree of compression, which is determined by the ratio resulting when the radial compression and axial deformations of the workpiece (in our example - shear deformation and stretching, respectively) can increase (or maintain at lower applied efforts), when performing the processing of the workpiece in the direction of the tion from the greater its cross-section to a smaller, since in this case the increased radial deformation (in our example - shear deformation).

To reduce the applied loads and "facilitate" the redistribution of alloying elements alloy e-110 is saturated with hydrogen, which, in this case, acts as a plasticizer and catalyst. When this saturation billet hydrogen are exposed to cold pressure treatment or during cold deformation, as well as before or in the process of annealing, i.e. the saturation of the metal billet hydrogen is useful at any stage of the creation of the layered material.

Metallographic examination of sections (smfg and 3)cut out from the product obtained by the claimed method, showed the presence of a transverse and longitudinal cross sections of bright, uniform, concentrically located, laborovaya layer of metal, occupying about one third of the wall thickness of the product. The electron probe microanalysis metal products showed that the content of niobium in the inner layer decreased from 1% to 0.1 to 0.2%, and in extreme layers, on the contrary, increased to 1.5% (smfg and 4). Mechanical testing of specimens cut from the inner longitudinal layer, showed that the strength of the metal in it, in comparison with the base metal pipe (Zr), decreased from 55 to 57 kg/mm2to 45-47 kg/mm2. At the same time, the ductility (elongation and the relative contraction) increased 1.5-2 times, which corresponds to the characteristics of pure zirconium. In addition, as a result of experiments conducted on a layered material obtained by the claimed method, it was discovered that he has valuable electrical properties: electrical conductivity in the direction from the outer layers to the inner (and Vice versa) is changed twice. These data allow us to conclude that there has been a significant change in the structure and properties of alloy e-110.

The inner layer of the product has clear boundaries and reliable metallic bond with the adjacent layers as well as the properties of the alloy e-110 as a whole, stored, and subsequent redistribution of the workpiece into smaller sizes.

Using the proposed method are made of three-layer material (trimetal) with metal interatomic bonds between the layers (by type of bimetals).

Example No. 2.

Collect cable preparation. To do this in a shell made of an alloy of zirconium, 1% niobium, $ 9.0×0.7 mm, length 1000 mm insert two termoelektrodnye veins of alloys chromel and alumel, diameter 1.1 mm, fill magnesia insulation and seal the ends of the shell by welding. Then spend the cold periodic rolling and deform the cable piece to size 4,0×0.35 mm, which corresponds to the degree of compression of an 80.2% and a hood with a factor of 5.0.

After deformat and the workpiece is annealed in a vacuum furnace and simultaneously provide its saturation by hydrogen, the source of which is hygroscopic magnesia insulation. The result is cable of the workpiece with a three-layer shell and thickness of the inner (intermediate) layer ˜ 0,12 mm

Example No. 3.

Collect cable preparation with a double shell. To do this, take cable preparation, consisting of a shell of an alloy of zirconium, 1% niobium with a diameter of 11 mm, which is equipped with termoelektrodnye veins, separated from each other and the shell magnesia insulation, and install it into the pipe of the same alloy size 13,0×0,75 mm Make the ends of the pipe and put her cold rolling. Deform the pipe to size 5,0×0.4 mm, which corresponds to the degree of compression of 85% and the drawing ratio is 5.1. After deformation spend annealing as in example 1.

Metallographic studies and electron probe microanalysis showed the presence of three transverse layers (with thickness of the intermediate layer ˜ 0.13 mm) in both membranes of the product.

Multilayer material obtained by the present method, was used for the manufacture of cable sheath diameter of 0.5 mm with thermocouple conductors and magnesia insulation, and demonstrated a high deformation ability. The multiple layers of the cable jacket also helped improve the fatigue strength of the cable under cyclic loading several times,due to a more uniform redistribution of stresses. In addition, there was a sharp decline in the development of cracks corrosion origin in the cable jacket, because their growth is retarded at the boundary layers. Also important is the fact that the boundary between layers acts as a barrier to diffusion of impurities and gases, deteriorating the properties of the alloy metals.

Thus, when using the present invention increase the deformation capacity and the resistance used in the industry of materials to corrosion and fatigue failure.

1. A method of manufacturing a layered material, which consists in the fact that the workpiece of metal alloy is subjected to cold working pressure and carry out its plastic deformation, characterized in that make billet of low-alloy two-component alloy and provide strain with a degree of compression of not less than 80% and with a drawing ratio of at least 5.

2. A method of manufacturing a laminate according to claim 1, characterized in that after the cessation of deformation of the workpiece is subjected to heat treatment.

3. A method of manufacturing a laminate according to claim 1, characterized in that the processing of the workpiece is performed in the direction from a great cross-section to a smaller one.

4. A method of manufacturing a laminate according to any one of claims 1 to 3, characterized in that the workpiece is saturated in what oredom before cold pressure treatment, and/or in the process of cold working pressure, and/or before heat treatment, and/or during thermal processing.

5. A method of manufacturing a laminate according to any one of claims 1 to 3, characterized in that as the blanks use cable preparation with magnesia insulation.



 

Same patents:

FIELD: plastic working of metals, in particular, production of laminated material from metal alloy, for example Zr-Nb alloy, for producing of cable sheathing for thermal couple.

SUBSTANCE: method involves providing plastic deformation of blank made from zirconium alloy in at least two directions, with deformation extent in one direction exceeding deformation extent in other direction by at least three times, and total algebraic value of deformation extent in all directions making at least 250%. After deformation, blank of zirconium alloy may be additionally exposed to annealing in vacuum furnace at temperature of up to 600 C.

EFFECT: increased efficiency in producing of three-layer material with increased deformation capability and high corrosion and fatigue destruction resistance.

2 cl, 5 dwg, 1 ex

FIELD: metallurgy; deformation and thermal treatment of memorized-shape effect titanium-nickel alloys; mechanical engineering; medicine.

SUBSTANCE: proposed method includes thermal and mechanical treatment including deformation and before-crystallization annealing. Prior to thermal and mechanical treatment, alloy is subjected to preliminary hardening. Deformation is performed at two stages: at first stage intensive plastic deformation is performed at accumulated true degree of deformation e≥ 4 within temperature range of 300-550°C; at second stage, deformation is performed by rolling, extrusion or drawing at degree of deformation no less than 20% and temperature of 20-500°C; annealing is performed at temperature of 350-550°C continued for 0.5-2.0 h.

EFFECT: improved mechanical properties at increased functional properties due to forming ultra-fine-grained structure.

6 cl, 1 tbl, 1 ex

FIELD: plastic metal working, possibly manufacture of intermediate blanks of titanium alloys by hot deforming.

SUBSTANCE: method comprises steps of deforming ingot at temperature in β -range and combination type operations of deforming blank temperature of (α + β) and β-ranges; at final deforming stage at temperature in (α + β) range realizing at least one forging operation after heating blank till temperature that is lower by 50 - 80°C than polymorphous conversion temperature of alloy; at least one time cooling blank in water; before deforming blank for final size, heating blank till temperature that is lower by 20 - 40°C than polymorphous conversion temperature for time period providing globule formation of α - phase; fixing formed structure by cooling in water; again heating blank till temperature that is lower by 20 - 40°C than polymorphous conversion temperature and finally deforming blank.

EFFECT: possibility for producing blank with globular-plate microstructure, lowered level of structural defects at ultrasonic flaw detection of turned blank.

1 ex

FIELD: processes and equipment for diffusion welding of tubular adapters of zirconium and steel sleeves.

SUBSTANCE: method comprises steps of placing sleeve of zirconium alloy inside steel sleeve and heating them in vacuum till diffusion welding temperature; then compressing welded surfaces due to expanding zirconium sleeve by means of roller expander; after diffusion welding cooling adapter in temperature range in which zirconium alloy has no phase containing α-zirconium and β-zirconium; subjecting zirconium sleeve to hot deformation by depth no less than 0.5 mm at reduction degree no less than 10%; cooling adapter till temperature range 540 - 580°C and keeping it in such temperature range no less than 30 min.

EFFECT: simplified method for making adapters having improved corrosion resistance in hot water and steam.

FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: metallurgy, namely processes for forging titanium alloys and blank of such alloy suitable for forging.

SUBSTANCE: method comprises steps of preparing blank and forging it. Forging is realized at providing mechanical hardening factor equal to 1.2 or less and at difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers. Factor of mechanical hardening is determined as HV(def)/HV(ini), where HV(ini) - hardness of titanium alloy blank before forging; HV(def) -hardness of titanium alloy blank after forging at forging reduction 20%. Forging may be realized at deformation rate from 2 x 10 -4 s -1 to 1s-1 while keeping relations (T β - 400)°C ≤ Tm ≤ 900°C and 400°C ≤ Td ≤ 700°C, where Tβ (°C) -temperature of β-phase transition of titanium alloy, T m(°C) - temperature of worked blank; Td(°C) - temperature of die set. Blank has factor of mechanical hardening 1.2 or less and difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers.

EFFECT: possibility for forging titanium alloy blanks at minimum difference of material properties along depth, simplified finishing of blank surface after forging, reduced cracking of blank material, good workability of blank with favorable ductility and fatigue properties.

8 cl, 5 tbl, 6 dwg, 4 ex

FIELD: non-ferrous metallurgy; methods of thermal treatment of items or blanks made out of the two-phase titanium alloys titanium alloys.

SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the method of thermal treatment of an item or blanks made out of the two-phase titanium alloys titanium alloys. The offered method of thermal treatment of an item or a blanks made out of the two-phase titanium alloys provides for their heating, seasoning and chilling. At that the item or the blank is heated up to the temperature of (0.5-0.8)tag , where tag is the temperature of the alloy aging, and chilling is conducted from -10 up to -20°С at simultaneous action of a gas current and an acoustic field of an acoustical range frequency with a level of the sound pressure of 140-160 dB. The technical result is the invention ensures an increased strength of items or blanks at keeping the satisfactory plastic properties.

EFFECT: the invention ensures an increased strength of items or blanks at keeping the satisfactory plastic properties.

7 cl, 1 dwg, 1 tbl, 1 ex

FIELD: aircraft industry; mechanical engineering; methods of metals plastic working.

SUBSTANCE: the invention is pertaining to the methods of metals plastic working, in particular, to production of blanks for units of a gas turbine engine and may be used in production of aircraft engines and in mechanical engineering. The method includes heating of a high-temperature resistant alloy bar and its straining during several runs. For obtaining a homogeneity of the blank chemical composition and structure in the whole volume of the blank and for increasing the alloy mechanical properties during the blank subsequent machining at least one run is conducted at the temperature exceeding the temperature of the beginning of the alloy hardening inter-metallic phase dissolution. Then, they conduct a press forming in the interval of the temperatures from the temperature of a recrystallization process start to the temperature of the recrystallization process end for production of the uniform fine grained structure, that ensures a high level of general physical-mechanical properties of the blank and the item as a whole.

EFFECT: the invention ensures production of the uniform fine-grained structure and a high level of general physical-mechanical properties of the blank and the item as a whole.

2 ex

FIELD: deformation-heat treatment of metal with change of its physical and mechanical properties, possibly in machine engineering, manufacture of air craft engines and in medicine for making semi-finished products of titanium.

SUBSTANCE: method comprises steps of intensive plastic deformation in mutually crossing ducts and further mechanical working of blank. Mechanical working is realized by multiple rolling or extrusion at 20°C at reduction degree in one pass causing no main cracking and material destruction. Number of passes of rolling or extrusion provides final deformation degree 80- 90 %.

EFFECT: manufacture of ultra-fine grain titanium sheet blanks with improved fatigue limit value at the same strength and working ductility.

1 dwg, 1 ex

FIELD: metallurgy, in particular feed from titanium-based alloy for aircraft industry and engineering.

SUBSTANCE: claimed method includes feed heating, deformation thereof in die, heated to temperature of total titanium-based alloy polymorphous conversion or above: isothermal holding at die temperature for time effective to total titanium-based alloy recrystallization; and quench. Feed is heated up to temperature by 10-30oC lower than the same of total polymorphous conversion; deformation is carried out in two steps: in the first one deformation rate is sufficient to feed heating up to die temperature, and deformation degree is 30-60 %, and in the second one rate is 10-2-10-4 s-1, and deformation degree is 10-30 %; isothermal holding is carried out under pressure of 10-150 MPa.

EFFECT: strained feed with homogenous recrystallized structure and β-grain size of 10-30 mum; with high strength and improved coefficient of metal utilization.

5 cl, 2 tbl, 1 ex

FIELD: mechanical engineering; piston internal combustion engines.

SUBSTANCE: invention relates to valve of internal combustion engine, method of its manufacture and heat-resistant titanium alloy used for manufacture of valve consisting of following components, mass %: aluminum 7.5-12.5; molybdenum 1.6-2.6; zirconium 1.4-2.4; silicon 0.1-0.2' yttrium 0.005-0.1; titanium - the rest. It has α+α2+β phase composition with intermetallide α2 phase on Ti3Al base dispersed in α phase. Proposed method includes forming of valve from cylindrical blank by deformation machining with preliminary heating and subsequent heat treatment. Preliminary heating of part of blank related to rod done to temperature 5-20oC lower than temperature of complete polymorphic transformation of alloy, and its deformation machining is carrying out by wedge cross rolling. Deformation machining of part of blank related to head is done by forging with preliminary heating to temperature 5-50oC higher than temperature of complete polymorphic transformation of alloy corresponding to beginning of forging, and forging is finished at temperature lower than complete polymorphic transformation of alloy to form plate head of valve and transition section provided smooth changing of head into rod. Invention provides designing of valve, method of its manufacture and heat-resistant alloy used in manufacture of valve making it possible to operate valve within operating temperature range owing to increased long-term strength and creep resistant of valve head material and increased strength, modulus of elasticity and hardness of valve rod material.

EFFECT: improved quality of valve and increased reliability in operation.

16 cl, 3 tbl, 1 ex, 15 dwg

FIELD: manufacture of metallic articles, particularly of hard-to-form intermetallic alloys, possibly electric resistive heating members.

SUBSTANCE: article is made of aluminides of iron, nickel and titanium. Method comprises steps of subjecting article being cold worked to cold hardening; performing rapid annealing at seasoning less than 1 min; repeating operations of cold working and rapid annealing for receiving article with desired size. It is possible to make article by casting, powder metallurgy process or plasma deposition.

EFFECT: enhanced strength of article.

26 cl, 4 dwg

FIELD: metallurgy, in particular feed from titanium-based alloy for aircraft industry and engineering.

SUBSTANCE: claimed method includes feed heating, deformation thereof in die, heated to temperature of total titanium-based alloy polymorphous conversion or above: isothermal holding at die temperature for time effective to total titanium-based alloy recrystallization; and quench. Feed is heated up to temperature by 10-30oC lower than the same of total polymorphous conversion; deformation is carried out in two steps: in the first one deformation rate is sufficient to feed heating up to die temperature, and deformation degree is 30-60 %, and in the second one rate is 10-2-10-4 s-1, and deformation degree is 10-30 %; isothermal holding is carried out under pressure of 10-150 MPa.

EFFECT: strained feed with homogenous recrystallized structure and β-grain size of 10-30 mum; with high strength and improved coefficient of metal utilization.

5 cl, 2 tbl, 1 ex

FIELD: deformation-heat treatment of metal with change of its physical and mechanical properties, possibly in machine engineering, manufacture of air craft engines and in medicine for making semi-finished products of titanium.

SUBSTANCE: method comprises steps of intensive plastic deformation in mutually crossing ducts and further mechanical working of blank. Mechanical working is realized by multiple rolling or extrusion at 20°C at reduction degree in one pass causing no main cracking and material destruction. Number of passes of rolling or extrusion provides final deformation degree 80- 90 %.

EFFECT: manufacture of ultra-fine grain titanium sheet blanks with improved fatigue limit value at the same strength and working ductility.

1 dwg, 1 ex

FIELD: aircraft industry; mechanical engineering; methods of metals plastic working.

SUBSTANCE: the invention is pertaining to the methods of metals plastic working, in particular, to production of blanks for units of a gas turbine engine and may be used in production of aircraft engines and in mechanical engineering. The method includes heating of a high-temperature resistant alloy bar and its straining during several runs. For obtaining a homogeneity of the blank chemical composition and structure in the whole volume of the blank and for increasing the alloy mechanical properties during the blank subsequent machining at least one run is conducted at the temperature exceeding the temperature of the beginning of the alloy hardening inter-metallic phase dissolution. Then, they conduct a press forming in the interval of the temperatures from the temperature of a recrystallization process start to the temperature of the recrystallization process end for production of the uniform fine grained structure, that ensures a high level of general physical-mechanical properties of the blank and the item as a whole.

EFFECT: the invention ensures production of the uniform fine-grained structure and a high level of general physical-mechanical properties of the blank and the item as a whole.

2 ex

FIELD: non-ferrous metallurgy; methods of thermal treatment of items or blanks made out of the two-phase titanium alloys titanium alloys.

SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the method of thermal treatment of an item or blanks made out of the two-phase titanium alloys titanium alloys. The offered method of thermal treatment of an item or a blanks made out of the two-phase titanium alloys provides for their heating, seasoning and chilling. At that the item or the blank is heated up to the temperature of (0.5-0.8)tag , where tag is the temperature of the alloy aging, and chilling is conducted from -10 up to -20°С at simultaneous action of a gas current and an acoustic field of an acoustical range frequency with a level of the sound pressure of 140-160 dB. The technical result is the invention ensures an increased strength of items or blanks at keeping the satisfactory plastic properties.

EFFECT: the invention ensures an increased strength of items or blanks at keeping the satisfactory plastic properties.

7 cl, 1 dwg, 1 tbl, 1 ex

FIELD: metallurgy, namely processes for forging titanium alloys and blank of such alloy suitable for forging.

SUBSTANCE: method comprises steps of preparing blank and forging it. Forging is realized at providing mechanical hardening factor equal to 1.2 or less and at difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers. Factor of mechanical hardening is determined as HV(def)/HV(ini), where HV(ini) - hardness of titanium alloy blank before forging; HV(def) -hardness of titanium alloy blank after forging at forging reduction 20%. Forging may be realized at deformation rate from 2 x 10 -4 s -1 to 1s-1 while keeping relations (T β - 400)°C ≤ Tm ≤ 900°C and 400°C ≤ Td ≤ 700°C, where Tβ (°C) -temperature of β-phase transition of titanium alloy, T m(°C) - temperature of worked blank; Td(°C) - temperature of die set. Blank has factor of mechanical hardening 1.2 or less and difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers.

EFFECT: possibility for forging titanium alloy blanks at minimum difference of material properties along depth, simplified finishing of blank surface after forging, reduced cracking of blank material, good workability of blank with favorable ductility and fatigue properties.

8 cl, 5 tbl, 6 dwg, 4 ex

FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: processes and equipment for diffusion welding of tubular adapters of zirconium and steel sleeves.

SUBSTANCE: method comprises steps of placing sleeve of zirconium alloy inside steel sleeve and heating them in vacuum till diffusion welding temperature; then compressing welded surfaces due to expanding zirconium sleeve by means of roller expander; after diffusion welding cooling adapter in temperature range in which zirconium alloy has no phase containing α-zirconium and β-zirconium; subjecting zirconium sleeve to hot deformation by depth no less than 0.5 mm at reduction degree no less than 10%; cooling adapter till temperature range 540 - 580°C and keeping it in such temperature range no less than 30 min.

EFFECT: simplified method for making adapters having improved corrosion resistance in hot water and steam.

FIELD: plastic metal working, possibly manufacture of intermediate blanks of titanium alloys by hot deforming.

SUBSTANCE: method comprises steps of deforming ingot at temperature in β -range and combination type operations of deforming blank temperature of (α + β) and β-ranges; at final deforming stage at temperature in (α + β) range realizing at least one forging operation after heating blank till temperature that is lower by 50 - 80°C than polymorphous conversion temperature of alloy; at least one time cooling blank in water; before deforming blank for final size, heating blank till temperature that is lower by 20 - 40°C than polymorphous conversion temperature for time period providing globule formation of α - phase; fixing formed structure by cooling in water; again heating blank till temperature that is lower by 20 - 40°C than polymorphous conversion temperature and finally deforming blank.

EFFECT: possibility for producing blank with globular-plate microstructure, lowered level of structural defects at ultrasonic flaw detection of turned blank.

1 ex

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