Hot rolled tube production process

FIELD: tube rolling of α and (α +β) titanium -base alloys.

SUBSTANCE: process comprises steps of forging ingot to blank; working blank; making central opening in it. Rolling blank in pilger mill and subjecting it to mechanical working. At each transition forging is started at temperature of β-range or at temperature of β- and (α +β ) range , as cooling blank, forging is ended in (α +β) range at forging reduction ratio no less than 20%. Through piercing of solid blank is realized at temperature in β-range. Before rolling in pilger mill pierced blank is cooled till temperature that is by 30 -100 C less than Tpr. Rolling process is performed at deformation rate (3 x 10-1 s-1 )- (102 s-1 ).

EFFECT: possibility for making tubes with fine-grain highly uniform microstructure.

1 cl, 2 ex

 

The invention relates to pipe production, namely the production of pipes from α and (α+β)alloys based on titanium. The invention can be used for the manufacture of products intended for use in various industries, including aerospace.

The structure of alloys based on titanium defines the most important criteria for the quality of semi-finished products, has considerable diversity and extraordinary influence on mechanical properties. The peculiarity of production of pipes made of alloys based on titanium is that harvesting for the production of ingots are obtained by vacuum arc melting, in which the processes of melting, casting and solidification are connected together, and separate control them is almost impossible. There is a significant overheating of the melt and forms a coarse-grained structure of ingots, with significant heterogeneity in the cross section and coarse (size β-grains larger than 1000 µm) lamellar microstructure. This leads to reduced deformability in (α+β)-area and low complex performance properties of products.

To improve the technological and operational properties required the formation of a fine-grained (grain size of the phases is not more than 150÷200 μm) of the microstructure. In addition, reaching the floor is the family of structurally homogeneous, it is important to assess the quality of the pipes by ultrasonic control which is widely used in their manufacture. In the case of highly homogeneous and fine-grained structure of titanium alloy in ultrasonic testing significantly reduced the level of acoustic noise increases the marginal sensitivity of the method, limited to these noises, and the material becomes more transparent, i.e. with the minimum level of structural noise, which creates the possibility of defect detection of the minimum size. This involves extending the life of products, and, consequently, reducing the cost of machinery and installations for the exploitation of products with defects allowable size.

A method of producing hot-rolled tubes from titanium α and (α+β)-alloys (RF Patent 2094141, the IPC 21 In 23/00, 3/00) prototype, including the forging of the ingot machining of the workpiece and drilling the center hole, it is heated to a temperature higher than the temperature of polymorphic transformation (CCI), the firmware on Konovalova piercing mill without lifting diameter with the hood in the range of 1.20 and 1.35, rolling on piligrimages the mill, cooled in water and machining the inner and outer surface.

This method of processing, due to low technological plasticity of titanium alloys is applicable mainly to semi-finished products previously undergone coracaodefora in (α +β)-region and does not have as a consequence coarse lamellar structure. In addition, in the processing (α+β)-based alloys titanium is formed β-structure, as in α-alloys - coarse α-structure preserves the original texture of the cake mix, leading to anisotropy of mechanical properties, low plasticity and a lack of transparency in ultrasonic testing. This way inherent in a multi-stage, mechanical processing upon receiving holes, as a consequence, the reduction outputs fit, the need for specialized mechanical equipment.

Object of the invention is:

- creating a processing method αand (α+β)-titanium alloys to obtain tubes of fine-grained (grain size not more than 150-200 microns) microstructure;

- achieving a structurally homogeneous state in the finished product, providing transparency for ultrasound quality control for raw materials and products;

exception mechanical retrieval operations center hole;

- increasing the yield.

Tasked with the production of hot-rolled tubes is solved by a method including the forging of the ingot in the workpiece, with subsequent mechanical processing, obtaining the center hole, rolling on piligrimages the mill and ekonicheskoy processing, forging at each transition start producing at a temperature in β- field, or βand (α+β)-region, and as cooling billet end up in (α-β)-areas with ukonom at least 20%, through the firmware of the continuous workpiece is carried out at a temperature of β-field, and before rolling on piligrimages mill sewn workpiece is cooled to a temperature of 30÷100°With the lower Chamber of Commerce, rolling carry-rate deformation from 3*10-1with-1up to 102with-1.

The invention is based on the fact that when thermo-mechanical modes of the proposed treatment as the result of a combination of the processes of recrystallization and phase transformations in the blanks of two-phase titanium alloys formed fine-grained microstructure with a high degree of uniformity.

Forging of the ingot in the rod at a temperature of β-the area on the first passages destroy the cast structure. Subsequent forging in (β+α)-areas with ukonom not less than 20% destroys large-angle grain boundaries. Subsequent heating of the billet to a temperature of β-the field when conducting end-to-end firmware has double meaning:

strain, after the preceding operations, followed by recrystallization structure with grinding grain;

- technology, advantageous, because it decreases the resistance on the formation.

The final deformation of the workpiece in the pipe on piligrimages mill in (α+β)-region, when the temperature of the beginning of deformation, equal to 30÷100°With the lower Chamber with strain rates ranging from 3*10-1with-1up to 102with-1leads to the final destruction of the large angle boundaries β-grains and uniform structure throughout the cross-section, increases the ductility of the metal.

It is possible in the method of production of hot-rolled tubes from alloys based on titanium to produce annealing obtained after rolling tubes at a temperature of Chamber of Commerce and industry(20-150)°C.

Because temperature range static recrystallization αand (α+β)-base alloys titanium is CCI-(50-180)°s, the annealing is recommended at a temperature of Chamber of Commerce and industry(20-150)°C.

When annealing is almost complete spheroidizing grains, conversion plate (α+β)-patterns in globular, which increases the plastic characteristics of the metal and allows you to use the pipe for subsequent cold rolling.

Industrial applicability of the claimed method for the production of hot-rolled tubes of alloy Gr29 (Ti-6Al-4VELI+0.5Ru; CCI=995±15° (C) the following examples of specific performance.

Example 1. Bullion for several transitions odouli in rod ⊘430 mm, when the temperature is 1050-1100° With (beginning in forging (β-region), the latter transition was carried out at a temperature of 950°With (beginning in forging (α+β)-region). Firmware (⊘430×100 mm → ⊘450×⊘320 mm) was carried out at a temperature of 1100-1150°With, then spent cooling the resulting liner to a temperature of 900°With subsequent rolling on piligrimages mill (⊘450×⊘320 mm → ⊘350×25×⊘300 mm) with a strain-rate of about 5*10-1with-1. Subsequent heat treatment was carried out at a temperature 760-960°C for 2 hours. Then edit machining to the requirements of API 5CT, etching, ultrasonic testing.

The microstructure of the different zones of the pipe showed that the Central and surface area have recrystallized globular structure with the size of equiaxial grains 110-140 μm.

Example 2. Billet - forged machined rod ⊘430×500 mm Thermomechanical processing modes similar to that shown in example 1. After rolling on piligrimages mill received the pipe having the outer diameter ⊘377 mm and a wall thickness of 27 mm, Then the pipe by cold-rolled deformed in size ⊘340×15×⊘310 mm, after the second heat treatment, etching and ultrasonic testing.

Analysis of the microstructure of the pipe showed that the equiaxial structure, close to the globular the grain size 80-105 μm, the macrostructure in the longitudinal direction in the form of elongated in the direction of rolling grains, characteristic of cold pipes.

1. Method of manufacturing hot-rolled tubes from αand (α+β)-based alloys, titanium, including the forging of the ingot in the workpiece, with subsequent machining, the Central receiving hole, rolling on piligrimages mill and machining, characterized in that the forging at each transition starts at a temperature in β- scope or βand (α+β)-region, and as cooling billet end up in (α+β)-areas with ukonom at least 20%, through the firmware of the continuous workpiece is carried out at a temperature of β-field, and before rolling on piligrimages mill stitched the workpiece is cooled to a temperature of 30-100°lower Chamber of Commerce, rolling carry-rate, strain 3·10-1with-1up to 102c-1.

2. The method according to claim 1, characterized in that after rolling on piligrimages mill carry out the annealing of the pipe when the temperature of Chamber of Commerce and industry(20-150)°C.



 

Same patents:

FIELD: plastic metal working.

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2 cl, 2 ex, 1 tbl

FIELD: rolling.

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Pressure roll unit // 2260491

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7 cl, 7 dwg, 21 tbl, 2 ex

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3 cl, 4 tbl, 2 ex, 4 dwg

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3 cl, 4 tbl, 2 ex, 4 dwg

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2 cl, 5 dwg

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2 dwg

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20 cl, 16 dwg

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EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.

11 cl, 1 dwg, 2 tbl, 1 ex

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