Method of producing titanium round rods with ultrafine structure

FIELD: process engineering.

SUBSTANCE: proposed method comprises stage-by-stage grinding of titanium billet grains by abc-forming and multi-pass rolling in grooved rolls with stepwise reduction in groove section at fixed temperature of billet heating for rolling. Increased mechanical properties are ensured by stepwise grain grinding at stepwise temperature reduction in the range of 750-500°C. In abc-forming, titanium billets made be subjected to recrystallisation annealing at 680-700°C for 1 h. Rolling in grooved rolls is performed at reducing billet temperature by 40-60°C at every pass to groove smaller section from 500°C to 300°C whereat rod final round cross-section is formed. The number of groove cross-sections id selected to provided for reduction not exceeding 40% in transition from one groove to another. Rolling is performed in several passes on turning the billet through 90 degrees about lengthwise axis. 4-8 mm-dia round titanium billets are produced to meet high purity standards.

EFFECT: higher metal yield.

6 cl, 2 tbl, 3 ex

 

The invention relates to deformation-heat treatment changes the physical-mechanical properties of the metal and can be used in mechanical engineering, aircraft engine industry and medicine in the manufacture of semi-finished titanium.

The known method of forming ultrafine-grained structure in a metal workpiece and a device for its implementation (RF patent No. 2341350, B21J 13/02, 5/00; C21D 7/00; C22F 1/00, publ. 20.12.2008). The invention relates to deformation-heat treatment. The formation of ultrafine-grained structure in a metal workpiece by deformation processing pressurized includes a gradual compression of the workpiece vertically compressive punch in the mold containing the matrix, bottom, limited flat bottom with a cavity to accommodate a workpiece and for handling the workpiece in three orthogonal directions with the provision of a plastic flow of the workpiece material in directions not coincident with the direction of the compressive force. At each stage of deformation processing, the workpiece is placed in the cavity of the matrix, compress and extract the deformed blank from the cavity of the matrix. Before placing the preform in the cavity of the matrix produce filling the lower part of the cavity of the matrix filling of refractory powder is 0.1-0.5 of the compressed height of the workpiece, then otoku placed on the backfill, fill with filling the free space formed between the two pairs of sliders and the workpiece to a level above the upper point of the workpiece by 0.1-0.5 compressible her height, is inserted into the matrix of the punch, move it up to ensure compression of the billet in 10-60% of its height. Stages of deformation of the workpieces to repeat, changing directions of deformation, prior to the formation of ultrafine-grained structure throughout the volume of the workpiece.

The disadvantage of this method is the low productivity associated with multiple filling the cavity of the matrix filling and subsequent extraction from the cavity of the matrix, and the presence of backfill as bulk material, leading to appreciation of the way. In addition, the known method does not allow to obtain the maximum achievable physico-mechanical characteristics.

A method of obtaining ultrafine-grained titanium billets (RF patent No. 2175685, C22F 1/18, B21J 5/00, publ. 10.11.2001).

The invention relates to deformation-heat treatment changes the physical-mechanical properties of the metal and can be used in mechanical engineering, aircraft engine industry and medicine in the manufacture of semi-finished products made of titanium. The essence of the method consists in the following: hold the plastic deformation of the workpiece in intersecting vertical and horizontal channel is at low temperature in the range of 500-250°C with accumulated logarithmic degree of deformation e≥4, followed by thermomechanical processing alternation of cold deformation with the degree of 30-90% with intermediate and final annealing in the temperature range 250-500°C for 0.5-2 hours Technical result of the invention is the improvement of the mechanical properties of the processed material by increasing the strength and fatigue characteristics while maintaining ductility. The combination of severe plastic deformation and subsequent thermomechanical processing in these modes allows to form in the material of thermally stable ultra fine-grained structure with a grain size not more than 0.1 μm, it increased the level of tensile strength and fatigue strength.

There is a method allows to obtain due to severe plastic deformation and subsequent thermomechanical processing of ultrafine-grained structure of the processed material with a grain size of about 0.1 μm, which increases the strength and fatigue characteristics. However, rolling at room temperature requires a very small reduction in one pass to provide an acceptable level of yield that increases the duration of the process and increases the cost of final products.

Closest to the proposed technical solution is the way to get pieces of sestig the Anna form a nanocrystalline structure and a device for deformation processing in the implementation of this method (patent RF №2383632, C21D 7/10, C22F 1/00, B21J 5/00, 13/02, B82B 3/00, publ. 10.03.2010).

The invention relates to methods of deformation and heat treatment of metals by pressure and can be used to obtain preparations hexagonal shapes with a high level of physical and mechanical properties. The original billet is subjected to consecutive cycles of deformation processing and subsequent multi-pass rolling at the rolling mill at room temperature. Each cycle of deformation processing includes placing the workpiece in the cavity of the device, deformation, removing from the specified cavity and reinstalling for the next cycle by turning 90°. The cavity has intersecting the upper vertical and lower horizontal part. The deformation produced by the compression of the workpiece by the height in parts of the cavity with the provision of a plastic flow of the workpiece material in two opposite directions. When this limit strain walls of the lower horizontal part of the cavity. This part has a rounded top side edges and two located on top of backwater wedge-shaped. The square of the input cross-sections of the lower horizontal part of the cavity at 3-20% less cross-sectional area of the upper vertical part. The result is the obtaining of workpieces with a uniform structure in all of the heme. There is a method allows to obtain due to severe plastic deformation and subsequent thermomechanical processing rods of titanium with ultrafine-grained structure, which ensures high strength characteristics. However, the yield of product in the framework of this technology does not exceed 60÷70%, which leads to a large amount of waste and significantly increases the cost of the final price of products.

The task of the invention is to develop a method of obtaining high-strength titanium round bars with ultrafine-grained structure. When implementing the present invention increase the yield of high-strength titanium rods with ultrafine-grained structure with a diameter of 4-8 mm with a high level of physical and mechanical properties.

This technical result is achieved in that a method of obtaining a high-strength titanium round bars with ultrafine-grained structure includes a phased grinding grains in the titanium workpieces method ABC-pressing and subsequent multi-pass rolling in brown rolls with stepwise decreasing cross-section of the stream in each cycle of rolling at a fixed heating temperature of the billet for rolling.

Gradual grinding grains in the titanium workpieces method ABC-pressing assests the Ute at step decrease in temperature interval 750-500°C.

At the stage of ABC-pressing of titanium billet may be subjected to recrystallization annealing at a temperature of 680-700°C for 1 hour.

Rolling in brown rolls are at low heating temperature of the billet for rolling 40-60°C at each transition to a smaller section of a stream from a temperature of 500°C to 300°C, at which carry out the final formation of the final round cross-section of the rod.

The number of sections of streams is chosen so that the transition from one stream to another, the degree of compression does not exceed 40%.

Rolling in brown rolls are in multiple passes, turning the workpiece by 90° around the longitudinal axis with each pass.

Get titanium bars and rods of circular cross section with a diameter of 4-8 mm titanium technical purity.

The present invention is aimed at improving the yield in the production of titanium technical purity high-strength rods with ultrafine-grained structure.

This object is achieved by implementation of the proposed method, which includes a phased grinding grains in the titanium workpieces using the method ABC-extrusion and multi-pass rolling in brown rolls with stepwise decreasing cross-section of the stream in each cycle of rolling at a fixed heating temperature zagotovka rolling. Unlike the prototype, rolling in brown rolls is conducted at a constant temperature (room), and with step by lowering the heating temperature of the billet for rolling 40-60°C at each transition to a smaller section of a stream from a temperature of 500°C to 300°C at a given end section of the rod.

At the first stage of the technological cycle (preliminary grinding grain structure of titanium billets), that is, when ABC-pressing with step by lowering the temperature from 750 to 500°C, the material is the reduction in the average grain size. At the next stage are multi-pass rolling in brown rolls, speed reducing section of the stream. In the prototype rolling in brown rolls are at a fixed (room) temperature. At this temperature, rolling grain effectively crushed, which leads to additional increase in strength characteristics. However, rolling in brown rolls at room temperature leads to a sharply non-uniform deformation of the material in the cross section of the rod in the surface layers of the deformation is much larger, which provides a high work hardening of these layers and their partial delamination. Used in some cases, subsequent anneals do not eliminate these defects. The presence of surface defects leads to the fact that the yield is 60÷70%. To avoi the ü formation of surface defects, while maintaining the high strength properties of rods, the present invention rolling in brown rolls are with step by lowering the heating temperature of the billet for rolling 40-60°C at each transition to a smaller section of a stream from a temperature of 500°C to 300°C, at which carry out the final formation of the final round-section rod with a diameter of 4-8 mm

Temperature 500°C at the final stage of the ABC-pressing selected based on the fact that at lower temperatures ABC-pressing have to deal with a very shallow draft in each cycle, to avoid the destruction of the workpiece. In this case, the process becomes more expensive. Rolling in brown the rolls in the temperature range 500-300°C ensures a gradual grinding of grains at each isothermal cycle, which, in turn, reduces the heterogeneity of the deformation in the cross section of the rod. The final temperature of the rolling 300°C, on the one hand, yet sufficient for the processes of return (dynamic and metadynamic recrystallization), which reduces the likelihood of surface defects, and, on the other hand, if this temperature is not happening grain growth, and emerging ultrafine-grained structure provides the necessary strength properties.

The method works as education is om.

Depending on the given geometrical parameters (diameter and length of the rod), the required level of mechanical properties and microstructure of raw materials (titanium billet) choose the most optimal technological scheme (if the original procurement in the state of factory shipments is fine-grained structure with a grain size of 1-5 μm, the phase ABC-pressing can be reduced substantially). Titanium billet is subjected to severe plastic deformation method ABC-pressing at step decrease in temperature interval 750-500°C. At the final stage of the ABC-pressing at a temperature of 500°C to form the workpiece, which by its geometrical dimensions can be subjected to rolling in brown rolls. Rolling in brown rolls begin by heating the billet to 500°C, and to provide a good study of the material across the cross section of the workpiece are rolling in several passes, turning the workpiece by 90° around its axis with each pass. Then move to a rolling stream of smaller size, while reducing the heating temperature of the workpiece during rolling. The number of streams is chosen so that the transition from one stream to another, the degree of compression does not exceed 40% to prevent the destruction of the workpiece.

After performing the above procedures, Provo is Yat visual and instrumental monitoring of the quality of the surface of the rod and determine the mechanical properties.

Examples of specific performance.

Example 1.

For the manufacture of rods of 6 mm diameter with ultrafine-grained structure used ingots of titanium VT1-0 with an average grain size of 400 μm. From the original ingot cut the workpiece in the form of a parallelepiped. The billet was heated to 750°C and placed in the mold in which the compression was accompanied by stretching in one direction. Spent ABC-pressing with a draft on one side about 40%, i.e. heating and pressing was carried out 3 times. After that, the temperature of the pressing was lowered to 650°C and carried out two transition triangular orthogonal pressing with a total degree of precipitation of about 240%. Then spent recrystallization annealing at 700°C for 1 hour. After such mechanochemical processing the grain size decreased by about an order. For further grinding grains were ABC pressing consistently at 600, 550 and 500°C. At 600 and 550°C pressing was carried out in two transitions, and at 500°C in three transition, i.e. heating and pressing was carried out respectively 6 and 9 times. At low temperature pressing, the degree of plastic deformation for one transition was dropped from ~120% to ~100%. Then spent the hood rod of square cross section of about 15×15 mm by fractional bilateral pressing at 500°C with a total elongation of ~100%. Then polucen the th workpiece in the form of a rod of square cross section rolled in brown the rolls in the following mode:

- heating of the workpieces to a temperature of 500°C; four rolling in brook felling with a square cross-section of a stream by 25 mm diagonal; the heating is carried out once, rolling 4 times with the rotation of the rod 90° around the longitudinal axis;

- heating the rod to a temperature of 460°C; four rolling in brook felling with a square cross-section of a stream with a diagonal of 20 mm; the heating is carried out once, rolling 4 times with the rotation of the rod 90° around the longitudinal axis;

- heating the rod to a temperature of 420°C; four rolling in brook felling with a square cross-section of a stream with a diagonal stream 17 mm; heating is carried out once, rolling 4 times with the rotation of the rod 90° around the longitudinal axis;

- heating the rod to a temperature of 380°C; four rolling in brook felling with a square cross-section of a stream with a diagonal stream 14 mm; heating is carried out once, rolling 4 times with the rotation of the rod 90° around the longitudinal axis;

- heating the rod to a temperature of 340°C; four rolling in brook felling with a square cross-section of a stream with a diagonal stream of 11.5 mm; heating is carried out once, rolling 4 times with the rotation of the rod 90° around the longitudinal axis.

Further warm rolling in the rod is made in brown rolls with circular cross-sections of streams according to the following scheme:

- heating the rod to a temperature of 300°C; multiple rolling in Ruchi is 10 mm in diameter, after every 4 passes to heat the rod up to 300°C; heating and subsequent rolling is repeated 3 times;

- heating the rod to a temperature of 300°C; multiple rolling in the stream with a diameter of 8 mm, after every 4 passes to heat the rod up to 300°C, the heating and subsequent rolling is repeated 4 times;

- heating the rod to a temperature of 300°C; multiple rolling in the stream diameter 6.5 mm, after every 4 passes to heat the rod up to 300°C, the heating and subsequent rolling is repeated 5 times;

- heating the rod to a temperature of 300°C, multiple rolling in the stream with a diameter of 6 mm, after every 4 passes to heat the rod up to 300°C, the heating and subsequent rolling is repeated 5 times.

Properties obtained by the described process mode of the rod are shown in table 1. It is seen that the strength characteristics of the rod (line 4) are not inferior to those for rods obtained brook rolling at a fixed temperature (line 3), while the yield on the proposed method increased to 90÷95%.

Example 2.

For manufacturing high-strength rods with a diameter of 8 mm with ultrafine-grained structure was used as the original steel bars manufacturing plant with a diameter of 20 mm, annealed 1 hour at 680°C with an average grain size of ~1.4 µm. While ABC-pressing was performed in a simplified scheme. Started ABC products is at 600°C in two transitions, then at 550°C in two transitions and at 500°C in three of the transition. Then, the resulting workpiece in the form of a rod rolled in brown the rolls in the same mode as in example 1 with step by lowering the heating temperature of the billet for rolling at 60°C for each transition to a smaller section of a stream from a temperature of 500°C to 300°C, at which carry out the final formation of the final round-section rod with a diameter of 8 mm

Properties obtained by the described process mode of the rod are shown in table 2. It is seen that the strength characteristics of the rod (line 3) are not inferior to those for rods obtained brook rolling at a fixed temperature (line 2), while the yield on the proposed method increased to 90÷95%.

Example 3.

For manufacturing high-strength rods with a diameter of 4 mm with ultrafine-grained structure was used as the original steel bars manufacturing plant with a diameter of 20 mm, annealed 1 hour at 680°C with an average grain size of ~1.4 µm. While ABC-pressing was performed in a simplified scheme. Started ABC-pressing at 600°C in two transitions, then at 550°C in two transitions and at 500°C in three of the transition. Then, the resulting workpiece in the form of a rod rolled in brown the rolls in the same mode as in example 1 with step lower so the temperature of the heating billets for rolling at 50°C for each transition to a smaller section of a stream from a temperature of 500°C to 300°C, at which carry out the final formation of the final round-section rod with a diameter of 4 mm.

Thus, the proposed method can produce rods with ultrafine-grained structure with a given level of strength and the yield on 90÷95%.

3
A method of obtaining a high-strength titanium round bars with ultrafine-grained structure
Table 1
№ p/pProcessingThe grain size d, µmTensile strength
σIn, MPa
The yield strength σof 0.2, MPaThe elongation to break
δ,%
The yield, %
1The ingot400350±10250±1011,5±1-
2ABC pressing 750→500°C0,8550±10410±1033±1-
ABC pressing 750→500°C + warm rolling at 300°C0.6730±12461±2015±160÷70
4ABC pressing 750→500°C + warm rolling 500→300°C0,45820±12740±1024±290÷95

Table 2
№ p/pProcessingThe grain size d, µmTensile strength σIn, MPaThe yield strength σof 0.2, MPaLengthening of the gap δ,%The yield
1Rod ⌀20 mm, factory redistribution1,4500±8300±524±2-
2ABC pressing 750→500°C + warm rolling at 300°C0.6 730±12461±2015±160÷70
3ABC-pressing at 500°C + warm rolling 500→300°C0,151120±10960±1513±190÷95

1. A method of obtaining a high-strength titanium round bars with ultrafine-grained structure that includes a phased grinding grains in the titanium workpieces method ABC-extrusion and multi-pass rolling in brown rolls with stepwise decreasing cross-section of the stream in each cycle of rolling at a fixed heating temperature of the billet for rolling, characterized in that the rolling in the brook rollers carried out by lowering the heating temperature of the billet for rolling 40-60°C at each transition to the streams of smaller size from 500°C to 300°C, at which perform the final shaping of the rod end of round cross-section.

2. The method according to claim 1, characterized in that the phase-grinding grains in the titanium workpieces method ABC-pressing is carried out at step decrease in temperature interval 750-500°C.

3. The method according to claim 2, characterized in that at the stage of ABC-pressing titanium C the cooking is subjected to recrystallization annealing at a temperature of 680-700°C for 1 h

4. The method according to claim 1, characterized in that the number of sections of streams is chosen so that the transition from one stream to another, the degree of compression does not exceed 40%.

5. The method according to claim 1, characterized in that the rolling stream, brook rolls are in multiple passes, turning the workpiece by 90° around its axis with each pass.

6. The method according to claim 1, characterized in that get titanium bars and rods of circular cross section with a diameter of 4-8 mm titanium technical purity.



 

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14 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: proposed seal comprises cover and sealing V-like annular cuffs including case, jaw with working edges to get in contact with baffle and adapter fitted on bearing bush. Working edges are pressed against sealed surface by elastic properties of the jaws. Gaps resulting from wear of cuff working edges are ruled out by providing the proposed device with elastic ring elements with cross-section shaped to circle or ring fitted with interference between cuff case and jaw.

EFFECT: higher efficiency.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Rolling mill for rolling strip 4 has several main stands 1, 1' and reeler 2 arranged there behind. Said main stands incorporates working rolls 5, 5' and, at least, bearing rolls 6, 6'. Rolling mill control device 3 receives data on strip 4 to define, at least, one reduction A other than zero of strip 4 of all passes at rolling mill. Control device 3 uses entered data to define reduction of single pass for main stands 1, L. Said control device controls over stands 1, 1' and reeler 2 to make strip 4 be rolled in main stands in compliance with definite single-pass reductions and, then reeled, by reeler 2. Single-pass reduction of the main stand 1' arranged immediately ahead of reeler 2 equals zero while outlet side tension in strip 4 is smaller than that and inlet side. Strip 4 passes through said stand L with no deformation on, at least, one side.

EFFECT: higher quality of strip.

10 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Rolling mill for rolling strip 4 has several main stands 1, 1' and reeler 2 arranged there behind. Said main stands incorporates working rolls 5, 5' and, at least, bearing rolls 6, 6'. Rolling mill control device 3 receives data on strip 4 to define, at least, one reduction A other than zero of strip 4 of all passes at rolling mill. Control device 3 uses entered data to define reduction of single pass for main stands 1, L. Said control device controls over stands 1, 1' and reeler 2 to make strip 4 be rolled in main stands in compliance with definite single-pass reductions and, then reeled, by reeler 2. Single-pass reduction of the main stand 1' arranged immediately ahead of reeler 2 equals zero while outlet side tension in strip 4 is smaller than that and inlet side. Strip 4 passes through said stand L with no deformation on, at least, one side.

EFFECT: higher quality of strip.

10 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: method for obtaining high-strength wire from (α+β)-titanium-based martensite alloy involves obtaining of ingot, its hot deformation so that workpiece for drawing is obtained; drawing at room temperature till final size is obtained, and final heat treatment. After heat treatment is completed, the obtained workpieces are annealed in the air and machined; drawing is performed for many times with intermediate annealings in the air environment; at that, the machining is performed after the first drawing pass, and final heat treatment is performed in the air environment during 60-180 minutes at temperature of (0.5÷0.7)TSL °C with further cooling to room temperature.

EFFECT: increasing ultimate tensile strength at maintaining the high level of relative elongation due to uniformity of the structure throughout the length and section of wire.

1 tbl, 2 ex

FIELD: plastic working of metals, possibly manufacture of thin high-strength foil of titanium.

SUBSTANCE: method comprises steps of multi-pass reversing cold rolling and vacuum annealing; repeating cycle; using as initial blank titanium blank with ultra-fine grain structure provided due to intensified plastic deformation by equal-duct angular pressing process; rolling at pitch 15 - 8% for achieving total deformation 70 - 86 % per one cycle; setting number N of cycles necessary for making foil with thickness h according to mathematical expression; realizing vacuum annealing, preferably at temperature 350 -360 C for 0.5 - 1 h. Invention provides possibilities for making titanium foil with thickness up to 10 micrometers.

EFFECT: enhanced strength characteristics of titanium foil of lowered thickness with the same technological platicity7777.

2 cl, 2 tbl

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