Thin piece of beta-titanium or quasi-beta-titanium alloy and a method of manufacturing such thin piece using forging technique

FIELD: nonferrous metallurgy.

SUBSTANCE: invention provides axially unsymmetrical pieces with thickness less than 10 mm and made from β-titanium or quasi-β-titanium alloy. Microstructure of the core is formed by whole grains having degree of extension above 4 and equivalent diameter 10 to 300 μm. Manufacturing method envisages providing emailed blanc, converting it, if necessary, into elongated piece, forging elongated piece, hardening forged elongated piece, and annealing hardened forged elongated piece. Such piece can, for example, be a blade for turbine compressors. Optimal geometry enables improvement of aerodynamic properties and thereby working characteristics of engine, wherein the piece is utilized.

EFFECT: improved performance characteristics and prolonged service time.

12 cl, 2 dwg

 

The technical field to which the invention relates.

The present invention relates to a thin alloys of β-titanium or quasi-β-titanium, as well as to the method of manufacture of such products.

More specifically, the invention relates to products, axially asymmetric, having a thickness less than 10 mm and made of alloys β-titanium or quasi-β-titanium, as well as to method of manufacture, which is characterized by the fact that based on the forging operation.

The level of technology

The development of the present invention is related to solving problems of manufacturing monobloc vaned disk (BN) with blades that are mounted by the method of linear friction welding or soldering. Such monobloc vaned discs are usually made of alloys β-titanium or quasi-β-titanium with regard to the required mechanical properties, namely their durability to vibration fatigue. Currently, such products are produced by machining solid material (see, for example, U.S. patent No. 5326409).

In regard to the manufacturing method of forging blades such disks from alloys β-titanium or quasi-β-titanium there is a biased opinion. It is considered a priori that forging structures of alloys β-titanium or quasi-β-titanium, i.e. coarse-grained structures, to develop small products is oldini (blades) can only lead to the production of items with low mechanical properties (against shock loads and strength vibration fatigue). In this regard, in the manufacture of blades for blade disks (in particular, compressor disks) from alloys β-titanium using forging the known methods of manufacture of the blades, including the method according to U.S. patent No. 4505764 (which can be regarded as the closest analogue of the present invention), include the use of more complex operations, heat treatment, aimed at improving the structure of the alloy.

The invention

In an unexpected way in the framework of this invention the blades (fine products) from alloys β-titanium or quasi-β-titanium, high performance (i.e. defect-free in metallurgical terms, and with good mechanical characteristics), were obtained by the forging method, i.e. with a material saving in comparison with the classical method of machining. These blades have a higher durability compared to blades, manufactured by machining. In addition, there may be obtained the optimized geometry of the blades to improve their aerodynamic properties, and hence the operating characteristics of the engine in which they are used.

Thus, the invention was conceived and developed a non-obvious manner with respect to manufacturing monoblock love the internal disks (BN). It is not limited to this application, and naturally can also be used in more or less related fields, such as manufacturing monoblock blade rims (IM), repair monobloc vaned disk (BN) and monoblock blade rims (IM), and, more broadly, for the manufacture of thin articles from alloys β-titanium or quasi-β-titanium.

Mastering the method of forging in accordance with the invention as applied to workpieces of alloy β-titanium or quasi-β-titanium allowed to get slim products of these alloys β-titanium or quasi-β-titanium, characterized by the original microstructure of the core.

These products comply with the first aspect of the present invention.

The second aspect of the invention corresponds to the method of manufacture of such products by the forging method.

Thus, the first task to be solved by the present invention is directed, is to obtain products that are asymmetric with respect to the axis (i.e. non-wire) and having a thickness less than 10 mm (this value is 10 mm defines the concept of "a little thick" and "thin products"used in this description), and are made of alloys β-titanium or quasi-β-titanium. Thus the microstructure of the core of these products is formed by grains, which have a degree is tenutosi (prodolgovatoe) above 4 and the equivalent diameter of 10 to 300 microns.

Specialists in this area known alloys β-titanium or quasi-β-titanium. They have a compact hexagonal structure. They are well characterized, particularly in textbooks USA: ASMH (American Society Material Handbook) and MILH (Military Handbook). Currently, their use is limited to the manufacture of solid forged products or products of great thickness.

Unlike similar products, products made from these alloys in accordance with the invention, are fine products. Their properties are determined by the manufacturing process on the basis of one or more operations of forging. Such products have the original microstructure of the core. The grain of this microstructure are flattened.

They have a degree of elongation above 4. This degree of elongation is traditionally defined as the ratio of the largest dimension to the smallest dimension in the axial plane. Grains have an equivalent diameter of 10 to 300 microns.

Instead of large truncated grain structure is equivalent to (thin) products obtained by mechanical process, in the structure of core products according to the invention there are one-piece tapered lenticular grain.

Products made in accordance with the invention and having the above characteristics represent new products. These new products may be obtained by the method of forging. As explained above, there was a bias against attempts to obtain a fine structure by forging thicker structures with large grains. Unexpectedly it turned out that such subtle patterns have very interesting characteristics.

Products made in accordance with the invention, in an optimal embodiment represent the blades of the compressor of the turbomachine.

The invention is not restricted by these limits. These products can also be screws, namely underwater propellers, fan blades or mixers (which are in the environment, justifying their production of alloys β-titanium or quasi-β-titanium). This list of products is not exhaustive.

According to a particularly preferred variant of the invention (non-limiting) of the product in accordance with the invention is made of Ti17. This alloy is known to specialists in this area, currently used for the manufacture of solid products, namely compressor disks. It has a high yield strength and is also considered to be difficult to forge.

More precisely, we are talking about the alloy:

TA5CD4- metallurgical item

TiAl5Cr2Mo4- on chemical nomenclature.

Unexpectedly within nastojasih the invention of this alloy is Ti 17were forged thin products with a high degree of crimping. These forged products possess improved mechanical characteristics.

Next will be described a method of manufacturing of new products, described above, which corresponds to the second aspect of the invention.

This method of manufacture provides:

- getting enameled workpiece;

transformation, if necessary, this billet in an elongated product of the equivalent diameter of less than 100 mm;

- forging the specified oblong products;

- hardening of the specified oblong wrought products;

- leave the specified forged tempered oblong products.

Subject forging product known pre emulerat. This product represents in the General case, the intermediate product obtained by drawing or forging the source material, which has a larger equivalent diameter (greater thickness). It may be a rod (for example, 25 mm diameter)obtained by drawing the preform. In practice, alloys β-titanium or quasi-β-titanium exist mainly in the form of such blanks (for the manufacture of compressor drives mechanical processing).

This enamel product, that is, in the General case enamel prom is mediate product diameter (equivalent) less than 100 mm, in accordance with the invention transform by forging to finished product thickness less than 10 mm

To obtain such a finished product with optimized properties, the invention provides forging compliance with the following conditions. The forging operation contains at least two steps of hot forging:

the first step of hot forging at a temperature below or above β-transition, in General at temperatures from 700 to 1000°C;

the last stage of hot forging at a temperature above β-transition, in General at temperatures above 880°C.

It is obvious that the specific temperature values depend on the specific alloy β-titanium or quasi-β-titanium.

The degree of compaction (precipitation) at each step of hot forging is chosen equal to 2 or greater (more preferably 2), and speed forging (or speed flatten) ranges from 1 to 1·10-5c-1.

The forging operation may be limited to two phases of the hot forging mentioned above (the second of these stages hot forging must be hot forging at a temperature above β-transition). It may contain additional step of hot forging at a temperature below or above βtransition before the last (third) step of hot forging at a temperature above β-transition. It is possible that it may contain more than Tr is step by step hot forging (the latter must be at a temperature above β -transition), however, the benefits from increasing the number of stages of hot forging are not obvious.

Thus, forging contains in General a two or three stage hot forging carried out in the above conditions.

Known wrought products (forgings) if necessary, re-amaliyat between two consecutive steps of hot forging.

According to an optimal implementation of the stamp support at a temperature of from 100 to 700°C.

After the forging operation traditionally perform the quenching operation (usually directly after forging). This hardening can be performed in a pulsating air, in still air, in an oil bath or directly on the stamp. Optimally it is carried out under such conditions that cause the cooling rate below or equal to the cooling rate during quenching in an oil bath.

Vacation forged tempered products perform optimally at a temperature of from 620 to 750°during the period of time from 3 to 5 hours. These conditions optimize the functions specified characteristics of the finished product. Tempering is carried out in an inert atmosphere (namely, under vacuum or in argon), if the enamel has cracked or peeled off.

According to a particularly preferred variant of the method according to the invention is performed in the following conditions:

- procurement is the second alloy Ti 17(TA5CD4or TiAl5Cr2Mo4);

forging includes a first step of hot forging at a temperature below or equal to 840±10°below β-transition), or at a temperature higher than or equal to 940±10°With (above β-transition), and the second step of hot forging at a temperature of 940±10°With (above β-transition);

- hardening is carried out in the stamp, then in the still air;

- tempering is carried out at a temperature of 630°C for 4 hours

The method provides for obtaining the products described in the first part of this description, and this product can be a shovel.

The manufacture of such blades are described in more detail below as an example.

List of figures

Figures 1 and 2 are shown in different scales of the original microstructure of the core of such blades.

Information confirming the possibility of carrying out the invention

Figure 1 shows the cut in three directions: cross section in the plane And a longitudinal section in the plane and In the frontal cross-section in the plane C. the Magnification is 20x. Figure 1 is clearly visible to the lenticular shape of the grains, strongly tapered in transverse and longitudinal directions, and having a broad surface in the frontal cross section.

Figure 2 shows a cut in the scale h. Position 1 indicated they are pressed the grain, position 2 - recrystallized grains. The boundaries between the grains are very fine and have a complex weave.

Example: Manufacture of blades of Ti17method of forging.

Used the method comprises the following successive stages:

- drawing rod (diameter <100 mm) to obtain a billet with a diameter of 27 mm and a length of 240 mm;

- enamelling;

radial flattening volokonnogo rod for forming blades and base;

- heat the press to 200°C;

- speed impact (screw press): 10-4with-1;

the first step of hot forging:enamel preparation, sustained for 45 min at 940°With (hot forging above β-transition), flatten to a thickness of from 13 to 8 mm;
- the second step of hot forging:conditions similar to the first step of hot forging; re-flattening enables the creation of products with thickness from 9 to 1 mm

- cooling in the stamp, then on the table in the still air;

- leave directly after forging at a temperature of 880°C for 4 hours

The result is a blade with a microstructure of the core, which corresponds to the microstructure presented on the attached drawings.

1. The product with thickness less than 10 mm, asymmetry the Noah axis, made of alloy β-titanium or quasi-β-titanium and having a microstructure of the core, formed of whole grains with the degree of elongation above 4 and an equivalent diameter of 10 to 300 microns.

2. The product according to claim 1, characterized in that it is adapted for receipt by the forging method.

3. The product according to claim 1 or 2, characterized in that it is a blade of the compressor of the turbomachine.

4. Product according to any one of claims 1 to 3, characterized in that it is made from a TiAl alloy5Cr2Mo4(Ti17or TA5CD4).

5. A method of manufacturing a product according to any one of claims 1 to 4, providing

getting enameled workpiece;

conversion if necessary, this billet in an elongated product of the equivalent diameter of less than 100 mm;

forging specified oblong products;

quenching specified oblong wrought products;

leave the specified forged tempered oblong products.

6. The method according to claim 5, characterized in that the forging includes at least two steps of hot forging: the first stage hot forging at a temperature below or above β-transition and final step of hot forging at a temperature above β-transition, the degree of compaction at each step of hot forging is selected equal to or greater than 2, and sorostitute range from 1 to 1· 10-5with-1.

7. The method according to claim 6, characterized in that the forging involves three steps of hot forging: the first and second stages at a temperature independently select below or above β-transition, and the third stage at a temperature above β-transition.

8. The method according to claim 6 or 7, characterized in that it provides for the operation of re-enamelling of the product between two phases of the hot forging.

9. The method according to any of pp.5-8, characterized in that the stamp support at a temperature of from 100 to 700°C.

10. The method according to any of pp.5-9, characterized in that the specified tempering is performed in conditions that cause a cooling rate lower than or equal to the cooling rate during quenching in an oil bath.

11. The method according to any of pp.5-10, characterized in that the tempering performed at a temperature of from 620 to 750°during the period of time from 3 to 5 hours

12. The method according to any of pp.5-11, characterized in that

the workpiece is obtained from alloy TiAl5Cr2Mo4(Ti17or TA5CD4);

forging includes a first step of hot forging at a temperature below or equal to 840±10°or at temperatures less than or equal to 940±10°and a second step of hot forging at a temperature of 940±10°C;

quenching is carried out in the stamp, and then in the still air;

vacation spend pritemperature 630° With over 4 hours



 

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1 tbl, 1 ex

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7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: production of items from high-doped high-temperature wrought nickel alloys for disks of gas-turbine engines.

SUBSTANCE: proposed method includes vacuum induction melting for obtaining ingot for deformation. At least one cycle of pre-extrusion is performed which is followed by recrystallization annealing. Extrusion of blank is performed in die by repeated forcing of blank from cylindrical to taper part of die at temperature below Tc.d.γ' by 55-95C. Die is heated to temperature not below Tc.d.γ' -250C and not above the blank heating temperature. Rate of deformation , where Tc.d.γ' is temperature of complete dissolving of γ' phase. During each subsequent stage of forcing-out the blank, direction of forcing out is reversed as compared with previous stage. Prior to final deformation, blank is subjected to intermediate annealing. Items made from high-temperature nickel alloy have homogeneous structure in complex stampings and stable level of properties ensuring reduction of extrusion force and final deformation.

EFFECT: enhanced efficiency; increased factor of utilization of metal.

7 cl, 1 dwg, 3 tbl, 6 ex

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