Method of production of articles from high-temperature nickel alloy

FIELD: metallurgy; production of semi-finished products from high-temperature high-alloy wrought nickel-based alloys for manufacture of disks for gas-turbine engines working at temperatures higher than 600°C.

SUBSTANCE: proposed method includes preliminary deformation of blank by upsetting by two or more times, final deformation and heat treatment; first upsetting is performed in closed container; during next upsetting, technological metal ring at temperature of (0.02-0.5)Tdef. is placed on blank heated to deformation temperature Tdef. and free upsetting is performed in stamp tool heated to deformation temperature. Geometric parameters of ring are selected from given relationships. Preliminary deformation of blank is performed at intermediate annealing. Height-to-diameter ratio of starting blanks is no less than 3:1. Proposed method ensures forming of homogeneous fine-grain structure over entire volume of blank due to work in end zones.

EFFECT: simplified procedure; reduced labor consumption.

4 cl, 1 tbl, 5 ex

 

The invention relates to the field of metallurgy, namely, to obtain semi-finished products made of heat-resistant high-alloy wrought alloys are Nickel-based, intended primarily for the manufacture of axisymmetric parts of gas turbine and rocket engines of the type disks, hemispheres, membranes, "glasses" and other products forms, working in conditions of extreme loads at operating temperatures above 600°C.

When receiving a disk of Nickel heat-resistant alloys for deformation mainly use the ingot vacuum induction melting followed by vacuum arc remelting. To pre-deform to receive the workpiece with a uniform recrystallized grain and with the necessary flexibility, ingot repeatedly deform, reducing its transverse dimensions of the extrusion (extrusion) or special forging techniques (e.g., rotary swaging). Then spend multiple deformation draught in a closed container, followed by a free draft on flat strikers to increase the diameter of the cross section.

A known method of manufacturing a disk of high-alloy heat-resistant Nickel alloys, including preliminary deformation by extrusion (extrusion) on the rod with the degree of deformation 65-75% when temperature is below TPR γ' 60-80°followed by pressing in a closed container with a degree of deformation of 35-50% at a temperature below TPR γ' 60-80°; final deformation of a combination of precipitation and forming at temperatures below TPR γ' 40-60°with deformation rate of 75-85%; heat treatment, consisting of pre-annealing at a temperature below TPR γ' 100-130°; processing solid solution at a temperature in the range TPR γ'±10°With regulated cooling and subsequent aging (awts of the USSR №1637360).

The disadvantage of this method is the necessity of using complex power-consuming equipment, high labor intensity and duration of reusable operations pre (precipitation in a closed container) to increase the cross-section of the workpiece.

There is also known a method of producing blanks from maloplastichnye alloys by using an external metallic short shells.

Short sheath that is placed on the Central area of the workpiece, increases the resistance of the workpiece and reduces the unevenness of deformation in free upsetting due to the action of hydrostatic pressure and the geometric factor. (Lungoci. Handling the pressure of hard materials.- M: mechanical engineering, 1976, p.97-102) there is a method of deformation with short obolos the AMI with the deformation heat-resistant Nickel alloys application not found so as to create useful hydrostatic pressure of the sheath material at a temperature deformation 1050-1150°should be more durable or RunProgram the material. Such materials are scarce and trudnoobrabatyvaemyh, therefore making membranes of them impracticable.

A method of obtaining molded articles comprising the heating of blanks and their deformation in a heated stamp, in which the stamp is heated to a temperature higher than the temperature of the workpiece, and deform the workpiece with variable speed.

In the deformation process is heated contact with the stamp of the layers of the workpiece due to heat transfer from the warmer of the tool to the workpiece. The method allows to produce a draught of workpieces with large compared to normal or isothermal conditions the ratio of height to diameter (H/D) and to influence the intensity of the flow of metal in the end zones of the workpiece (awts of the USSR №485009).

The disadvantage of this method is that it cannot be applied to heat-resistant Nickel alloys due to high temperature deformation. The technical complexity and the problem of resistance die material limit the possibility of heating the dies to a temperature greater than the heat distortion temperature Nickel alloys.

The closest Academy of Sciences of the log, taken as a prototype, is a method of obtaining articles of heat-resistant Nickel alloy, including pre-strain draft for two or more times in a closed container in isothermal conditions (pressing) at a ratio of height and diameter of the workpiece more than 2.5:1; the final deformation in the temperature range (TPR γ'-80°÷TPR γ'-20° (C) and heat treatment by pre-annealing in the temperature range 900-1100°With processing solid solution with regulated cooling and aging in the temperature range 650-1050° (RF patent No. 2215059).

The disadvantage of the prototype is the high complexity of products and the lack of uniformity of structure in the resulting products.

The technical object of the present invention is to provide a method of producing articles of heat-resistant Nickel alloy, providing reducing the complexity of the process, as well as the formation of a homogeneous fine-grained structure throughout the volume of the workpiece by making the end zone.

To solve this problem, a method of obtaining articles of heat-resistant Nickel alloy, including pre-strain by precipitation two or more times, the final deformation and heat treatment, characterized t is m, when pre-deformation of the workpiece, the first draft is carried out in a closed container, and the next draft at a temperature of deformation Tdef. preparation set the technology metal ring having a temperature (0,02-0,5)Tdef. and carry out a free draught in the die tool is heated to a temperature of deformation.

The geometrical parameters of technological metal rings choose from the following relations:

NC=(0,25 - 0,75)NC,

D.=(1,2 - 1,7)d CR where

NK - ring height,

D.. - outer diameter of the ring

D CR - diameter cylindrical workpiece,

obtained after pre-deformation,

NC - height workpiece received

after preliminary deformation.

Preliminary deformation of the workpiece can be performed with intermediate anneals, the need for which is determined by the condition of the workpiece material.

The ratio of height and diameter of the original piece under the pre-deformation choose at least 3:1.

According to the proposed method of pre-strain implement draught in a closed container. Due to this, provide longitudinal stability of the workpiece and the right cylindrical form after precipitation, as well as achieve greater plasticity and deformation uniformity when the future is free upsetting of the billet due to the conversion of cast oriented crystalline structure in a more uniform recrystallized. When following the deformation of the free draught heated to a temperature deformation Tdef. the workpiece immediately prior to placement in the stamp set technological ring, pre-heated to a temperature (0,02 - 0,5)Tdef. In the result between the workpiece and technological ring is heat, and the volume of the workpiece occurs uneven temperature field. The Central area of the workpiece in contact with the process ring, loses heat and hardened compared to the warmer end zones where the heat does not have time to go through. Consequently, during free upsetting tool heated to a temperature of deformation, mainly for metal and accordingly, the study of patterns occurs in the end zones of the workpiece. The method allows to significantly increase the stability of the workpiece with loose sediment, i.e. its resistance to buckling, and to use procurement with a higher than normal sediment, the ratio of height to diameter (H/D). After precipitation free with technological ring blank may take the form of the barrel, and depending on the ratio H/D of its next rebuff in a closed container or freely rebuff in the usual way. When this deformation is mainly in the Central zone and the workpiece is again animal form close to cylindrical. Further from this procurement final stamping receive various axisymmetric parts. Operation free precipitation with technological ring on the proposed method allows you to replace the part of labor-intensive precipitation in a closed container in the process of redistribution of the workpiece at a larger diameter and to simplify and cheapen the process.

The most suitable material for technological rings on the proposed method is alloy steel, not forming when heated a significant scale.

The heating temperature and the geometrical parameters of the ring are chosen depending on the geometry of the workpiece and the temperature and speed of deformation parameters.

The need for intermediate annealing is determined by the condition of the workpiece material. In some cases, the technical result of the claimed invention may be achieved without intermediate anneals. The need for intermediate annealing is determined by the brand of alloy, its structural condition and the amount of deformation during pressure treatment. For example, heat-resistant alloy based on Nickel UP less doped than the alloys AC and AP and is considered to be quite high-tech. In pressed he admits single deformation up to 60% upon receipt of the products simple form allows the traversal is sterile without intermediate annealing.

Examples of implementation

For the practical implementation of the present invention were selected Nickel-base superalloy to drive turbines EC and EPID. Used the ingots obtained by conventional vacuum-induction melting followed by vacuum arc remelting (VI+VD) and obtained using the method of directional solidification (TS+TC).

Preliminary and final deformation draft conducted by specialized for isothermal forging press TS with induction heating installation punching tools.

Example 1. The proposed method of billet alloy AP obtained from an ingot (VI+VD) with a diameter of 320 mm, followed by pressing with the degree of 65-70%, receive the product, performing the following operations:

1) turning blanks on size ⊘100 mm ×600 mm;

2) sludge in a closed container ⊘120 mm at a temperature of 1080° (TPRγ'-40°) with the degree of deformation of 30% in the die tool, heated to Tdef.=1080°C;

3) free of sediment with technological ring at a temperature of 1080° (TPRγ'-40°) with the degree of deformation of 30% in the die tool, heated to Tdef.=1100°C;

The technological parameters of the ring:

TC=23°NC=175 mm, D.=145 mm

4) free of sludge at a temperature of 1080° (TPRγ'-40° ) with the degree of deformation of 25% in the die tool, heated to Tdef.=1080°C;

5) final deformation at a temperature of 1080° (TPRγ'-40°) in the die tool, heated to Tdef.=1080°C;

6) tempering at a temperature of 1100°8 hours;

7) aging at a temperature of 850°6 hours;

8) aging at a temperature of 780°16 hours.

Example 2. The proposed method of procurement, obtained from an ingot (VI+VD) with a diameter of 320 mm, followed by pressing with a degree 65-70%:

1) turning blanks on size ⊘100 mm ×500 mm;

2) sludge in a closed container ⊘120 mm at a temperature of 1100° (TPRγ'-40°) with the degree of deformation of 30% in the die tool, heated to Tdef.=1100°C;

3) annealing at a temperature of 1090° (TPRγ'-50°);

4) free of sediment with technological ring at a temperature of 1100° (TPRγ'-40°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1100°C;

The technological parameters of the ring:

TC=23°NC=112 mm, D.=144 mm

5) free the precipitate at a temperature of 1100° (TPRγ'-40°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1100°C;

6) annealing at a temperature of 1100° (TPRγ'-40°);

7) final deformation at a temperature of 1100° (TPRγ'-40°) in the die tool,heated to Tdef.=1100° C;

8) annealing at a temperature of 1100° (TPRγ'-40°);

9) heat treatment of the solid solution at a temperature of 1155° (TPRγ'+15°);

10) aging 870°6 hours +760°32 hours.

Example 3. The proposed method of ingot (TS+TC) with a diameter of 105 mm, obtained by the method of directional solidification in a ceramic form of constant cross-section with a temperature gradient at the solidification front 20-200°With:

1) turning ingot size ⊘100 mm ×450 mm;

2) sludge in a closed container ⊘120 mm at a temperature of 1150° (Tn.p.γ'+10°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1150°C;

3) annealing at a temperature of 1150° (TPRγ'+10°);

4) free of sediment with technological ring at a temperature of 1090° (TPRγ'-50°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1090°C;

The technological parameters of the ring:

TC=285°NC=188 mm, D.=170 mm

5) free the precipitate at a temperature of 1100° (TPRγ'-40°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1100°C;

7) annealing at a temperature of 1100° (TPRγ'-40°);

8) final deformation at a temperature of 1100° (TPRγ'-40°) in the die tool, heated to Tdef.=1100°C;

12) annealing at a temperature of 1100° (TPRγ'-40&x000B0; );

13) heat treatment of the solid solution at a temperature of 1155° (TPRγ'+15°);

14) aging 870°6 hours +760°32 hours.

Example 4. For the proposed method (the state of the source material in example 3):

1) turning ingot size ⊘100 mm ×300 mm;

2) sludge in a closed container ⊘120 mm at a temperature of 1150° (Tn.p.γ'+10°) with deformation rate of 20% in the die tool, heated to Tdef.=1150°C;

3) annealing at a temperature of 1150° (TPRγ'+10°);

4) free of sediment with technological ring at a temperature of 1090° (TPRγ'-50°) with the degree of deformation of 25% in the die tool, heated to Tdef.=1090°C;

The technological parameters of the ring:

TC=545°NC=225 mm, D.=204 mm

5) final deformation at a temperature of 1100° (TPRγ'-40°) in the die tool, heated to Tdef.=1100°C;

6) annealing at a temperature of 1100° (TPRγ'-40°);

7) heat treatment of the solid solution at a temperature of 1155° (TPRγ'+15°);

8) Aging 870°6 hours +760°32 hours.

Example 5. In the prototype method of ingot (TS+TC) (the state of the source material in example 3):

1) turning ingot size ⊘100 mm ×400 mm;

2) sludge in a closed container ⊘120 mm at a temperature of 1150° (TPRγ'+10°) with the degree of deformation of 25% of the die tool, heated to Tdef.=1150°C;

3) annealing at a temperature of 1150° (TPRγ'+10°);

4) sludge in a closed container ⊘135 mm at a temperature of 1050° (TPRγ'+10°) with the degree of deformation of 25%;

5) annealing at a temperature of 1090° (TPRγ'-50°);

6) free of sludge at a temperature of 1100° (TPRγ'-40°) with the degree of deformation of 25% in a hot die tool (isothermal);

7) annealing at a temperature of 1100° (TPRγ'-40°);

8) final deformation in the die at a temperature of 1100° (TPRγ'-40°) in the die tool, heated to Tdef.=1100°C;

9) annealing at a temperature of 1100° (TPRγ'-40°);

10) heat treatment of the solid solution at a temperature of 1155° (TPRγ'+15°);

11) aging 870°6 hours +760°32 hours.

The table shows that the proposed method can be implemented as ingots obtained by conventional method (VI+VD), and bars (TS+TC). Upon receipt of the details of the proposed method replacement surgery precipitation in a closed container for surgery-free precipitation with technological ring allows you to reduce the cost of die tooling to 30%. In addition, due to the adherent simplify the complexity of manufacturing parts is reduced by 10%. The proposed method also allows a greater degree of Prora is otate (chop) structure in the end zones of the workpiece. This ensures uniformity of structure in the further final forging and heat treatment, and, ultimately, the stability properties of the product.

No. approx

EPA
Method of melting and remeltingH/D ex.

for-Ki
The parameters used technological ringsThe grain size in the end zone

billet, mm
The complexity of the process

get disk h/h
The cost of stamping

snap, RR
Temperature, °Height, NC., mmOuter diameter, Dap.., mm
123456789
1Hot

suggested
VI+VD6:1231751457516201250000
2VI+VD5:1231121447516201250000
3methodVI+NC4,5:1/td> 2851881708516201250000
VI+NC3:15452252049016201250000
4Prototype methodVI+NC4:1Technological ring is not used11018001750000

1. The method of obtaining articles of heat-resistant Nickel alloy, including pre-strain by precipitation two or more times, the final deformation and heat treatment, characterized in that during the preliminary deformation of the workpiece, the first draft is carried out in a closed container, and the next draft at a temperature of deformation Tdef. preparation set the technology metal ring having a temperature (0,02-0,5)Tdef., and carry out a free draught in the die tool is heated to a temperature of deformation.

2. The method according to claim 1, characterized in that the geometrical parameters of technological metal rings choose from the following relations:

NC=(0,25-0,75)NC,

D.=(1,2-1,7)d said,

where NC is the height of the ring,

D. - outer diameter of the ring

D CR - dia is the ETP of the cylindrical workpiece, obtained after pre-deformation,

NC - height workpiece obtained after pre-deformation.

3. The method according to claim 1, characterized in that the preliminary deformation of the workpiece is performed with intermediate anneals.

4. The method according to claim 1, characterized in that the ratio of height and diameter of the original piece under the pre-deformation is not less than 3:1.



 

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