Method to produce titanium blanks

FIELD: metallurgy.

SUBSTANCE: method to produce titanium blanks involves placement of titanium sponge particles in a press chamber, compaction of the sponge particles to produce a blank, its pressing, removal of dirt from the pressed blank surface, its covering with grease and following rolling. Prior to placing the titanium sponge particles in the press chamber they are heated in a vacuum heating furnace up to the temperature of 700-800°C, alloyed by hydrogen up to the concentration of 0.1-0.9 wt %, then the temperature in the furnace is reduced to the temperature not lower than 300°C, compaction is carried out under the temperature of 300-700°C, compacted blanks are pressed by semicontinuous method via a matrix under the temperature of not more than 700°C with reduction ratio of maximum two and then under the temperature of not more than 700°C and the reduction ratio of maximum three, the blanks are rolled under the temperature of not more than 700°C, with following annealing in vacuum under the temperature of not less than 700°C.

EFFECT: possibility to process hardly deformable titanium under lower temperatures, improved mechanical properties of produced blanks.

1 ex

 

The invention relates to ferrous metallurgy, in particular to the processing of metals by pressure, mainly for the production of billets of titanium sponge.

A method of obtaining pig pieces of metal subgroups titanium and alloys on its basis (RF patent No. 2107585, MPK B22F 3/02, publ. 27.03.96 year). The method includes preparing a mixture (starting material), temperature and strain effects on him, providing the compacting of the material, including the final hot deformation, which are cut into pieces and their hot compacting in vacuum at a pressure not more than 2×10-4 mm Hg at a temperature of 850-1200°C and at a pressure of 5-100 MPa for 1-60 minutes.

Common to the known and declared methods is the presence of transactions on the temperature and strain effects on the source material and its hot compacting.

The disadvantages of this method include the difficulty and complexity of its constituent technological operations, the need to maintain high temperatures up to 1200°C and a vacuum with a residual pressure of not more than 2×10-4 mm Hg

The closest to the claimed technical essence and the achieved effect is a method of manufacturing titanium welding wire (application WO 2011/049465, IPC C22C 14/00; B21B 1/16; B22F 3/02; B23K 35/32; C22F 1/18, publ. 28.042011,, the priority of GB from 23.10.2009,). The known method is characterized by the fact that in it the source material is placed in the camera uniaxial press in the form of one or more particles of titanium sponge, which is subjected to cold compaction, to form a billet. The compacting continue as long as the sample is not condensed in solid billet with a density of more than 80%. The pressed workpiece is covered with grease. The workpiece is heated to a temperature of 400-1000°C, subjected to pressing at a temperature of 400-1000°C, the pressing rod or profile in the same temperature range and subsequent rolling. Extruded rod has a density of more than 98%. From the surface of the obtained rod or profile remove impurities. The initial temperature of the billet during extrusion does not exceed 1000°C, the temperature of the rod at the outlet of the press also does not exceed 1000°C.

Common to the known and declared methods are: placement of particles of titanium sponge in the chamber of the press, the compacting sponge before harvesting, pressing, removing dirt from the surface of the molded preform, coating it with lubricant and subsequent rolling.

The disadvantage of this method is the high resistance workpiece material deformation, requiring application of high-temperature heating, which leads to intensive okelani is, reducing the mechanical properties of the processed metal and calling embrittlement. In addition, high temperatures reduce the tool life, the life, thereby increasing the consumption of the instrument and the reliability of the equipment as a whole.

The objectives of the present invention is to reduce the deformation resistance of the processed material and the ability of the method in the lower temperature range.

The technical result of the claimed invention is to provide the processing capabilities of the hard-titanium in the temperature range lower range, the enhancement of the mechanical properties of the resulting blanks, equipment reliability, service life and reducing the consumption of the instrument.

This is achieved in that in the method of manufacturing a billet of titanium, including the placement of particles of titanium sponge in the chamber of the press, the compacting of the particles of the sponge to obtain billets, hot-pressing of the workpiece, removing dirt from the surface of the molded preform, coating it with lubricant and subsequent rolling, while before placing particles of titanium sponge in the cell press their heated in a vacuum heating furnace to a temperature of 700-800°C, alloyed with hydrogen to a concentration of 0.1-0.9 wt.%, then reduce the temperature in the furnace to a temperature of not lower than 300°C, com is reporting is conducted at a temperature of 300°C-700°C, pressing compact workpieces carried out semi-continuous method through the matrix at a temperature not higher than 700°C with a drawing ratio of not more than two, then at a temperature not higher than 700°C and a drawing ratio of not less than three, the rolling is carried out at a temperature not higher than 700°C, and after rolling carry out annealing in vacuum at a temperature not lower than 700°C.

An example of a specific implementation. To produce billets of titanium took particles of titanium sponge size 2-4 mm without pre-processing and placed in a vacuum heating furnace, have sealed it, creating a vacuum of not less than 2×10-2mm Hg Sponge was cured in a vacuum at a temperature of 750°C for one hour. Then in a heated vacuum oven was introduced hydrogen until it is fully loaded absorption into it of titanium sponge. The concentration of hydrogen in titanium was 0.1-0.9% of the mass. After alloying of titanium sponge with hydrogen in the vacuum heating furnace reduced the temperature to a value below the temperature of the beginning of the active absorption by titanium atmospheric gases, less than or equal to 400°C, in particular up to 350°C, and produced the depressurization of the vacuum furnace. The heated particles doped with hydrogen titanium tolerated in preheated 325°C the camera press with a diameter of cavity 45 mm and a length of 120 mm, the Compacting produced as follows. PL is ngerem press has created pressure on the porous mass of particles of titanium sponge, and she was compactibility, with an applied pressure of 800 MPa and a temperature of from 300 to 700°C, because in this range in the system Ti-H are phase transformations, which decreases the resistance of the titanium deformation and increases its ductility. Heating to a temperature of 325°C particle titanium has reduced its deformation resistance 1.5 times in comparison with titanium, not containing hydrogen at the same temperature. As a result, the porosity of the workpieces when the doping hydrogen sponge has been reduced from 3% to 1%. Thus, the received high-density compacted billet of titanium sponge with a diameter of ≈45 mm and a height of ≈45 mm After receiving compacted billets required density, camera press, the inside temperature of which was 325°C, was filled with the next batch of titanium sponge, alloy hydrogen, with skorrektirovannoe procurement remained in the cavity of the camera press. The plunger of the press has created pressure on a new batch of titanium sponge, which makes this portion of the sponge was the formation of a compact billet and simultaneous pressing of the first compacted billet with double compression. The value of drawing ratio equal to two, determined by the level of pressure required to seal the second portion of the sponge and the formation of the billet, the compression is through the matrix. After pressing alloy hydrogen compacted workpiece from the container of the press received a billet with a diameter of ≈31 mm, height ≈90 mm and a relative density of ≈99%, and in its original place in the cavity of the camera press has been compacted workpiece from the second portion of the sponge. The process is repeated using the following portions of the sponge. This allowed us to produce semi-continuous extrusion of compacted blanks with no external porosity and low internal porosity. The obtained extruded billet with a diameter of ≈31 mm, height ≈90 mm and a relative density of ≈99%purified from dirt and covered by a glass lubricant to facilitate further compaction, minimize the wear of the pressing snap and prevent the admission of atmospheric impurities.

Subsequent pressing at 600°C was carried out as follows. The workpiece was heated and immediately moved into the pre-heated container of a press equipped with a die with a hole diameter of 11 mm Plunger with increased force pressed on the rear end of the billet. After the plunger ultimate position it took in the press container was placed next compacted and pressed the workpiece, after which it was applied force was dopasowanie first material is key and started pressing the second that is implemented semi-continuous pressing. Of compacted and molded workpiece diameter ≈31 mm was obtained rod with a diameter of ≈11 mm, the drawing ratio had a value of 8. Pressing at 600°C blanks obtained from the particles of the alloy with hydrogen titanium sponge was made with the effort of pressing 1.3 times lower than that of the workpieces that does not contain hydrogen. Obtained from the doped hydrogen particles rods were porous, bars and rods, of non-alloy hydrogen sponge had porosity=1%. The mechanical properties of the billet at 600°C in the first case was characterized by σ0,2=22.4 MPa, St=28,1 MPa, δ=58,6%, Ψ=99.2%, and in the second σ0,2=23,8 MPa, St=28.7 MPa, δ=16%, Ψ=44%. Thus, the use of particles of titanium sponge, alloy hydrogen, resulted in the decrease in tonnage procurement, increase density and improve the deformation properties.

Next, the resulting billet was subjected to rolling. The rolling process was made at a temperature not exceeding 700°C, after removal of dirt from the billet surface and cover them with grease and repeated to obtain the final size and shape. After rolling compacted and double-pressed billet was obtained wire, profile.

After rolling was produced by annealing in vacuum to remove hydrogen from titanium, which was carried out by exposure of the wire n is Greta furnace in a vacuum of not more than 2×10 -2mm Hg, contributing to the removal of hydrogen from titanium. The annealing was made at a temperature of 850°C for 3 hours.

Thus, the application of the inventive method of manufacturing billets of titanium allows you to provide processing capabilities hard-titanium in the temperature range lower range, the enhancement of the mechanical properties of the resulting blanks, equipment reliability, service life and reducing the consumption of the tool.

A method of manufacturing a billet of titanium, including the placement of particles of titanium sponge in the chamber of the press, the compacting of the particles of the sponge prior to harvesting, pressing, removing dirt from the surface of the molded preform, coating it with lubricant and subsequent rolling, characterized in that before placing particles of titanium sponge in the cell press their heated in a vacuum heating furnace to a temperature of 700-800°C, alloyed with hydrogen to a concentration of 0.1-0.9 wt.%, then reduce the temperature in the furnace to a temperature of not lower than 300°C, the compacting is carried out at a temperature of 300-700°C, pressing compact workpieces carried out semi-continuous method through the matrix at a temperature not higher than 700°C with a drawing ratio of not more than two, and then at a temperature not higher than 700°C and a drawing ratio of not less than three, while rolling zag is tovok carried out at a temperature not higher than 700°C, after which carry out the annealing in vacuum at a temperature not lower than 700°C.



 

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