CN110952053A - Short-flow homogenization cogging process of Nb-containing solid solution strengthened nickel-based superalloy, alloy device and application of alloy device - Google Patents
Short-flow homogenization cogging process of Nb-containing solid solution strengthened nickel-based superalloy, alloy device and application of alloy device Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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Abstract
The invention provides a short-flow homogenization cogging process of Nb-containing solid solution strengthening type nickel-based superalloy, an alloy device and application thereof, relates to the technical field of alloy, and comprises the following steps: carrying out incomplete homogenization treatment and extrusion cogging on the Nb-containing solid solution strengthened nickel-based superalloy in sequence; and the extrusion cogging comprises the step of carrying out extrusion treatment on the Nb-containing solid solution strengthened nickel-based high-temperature alloy subjected to the incomplete homogenization treatment, wherein the temperature of the extrusion treatment is 1130-1150 ℃. The short-flow homogenization cogging process has the advantages of short heat preservation time, low energy consumption, high efficiency and good cogging effect.
Description
Technical Field
The invention relates to the technical field of alloys, in particular to a short-flow homogenization cogging process of a Nb-containing solid solution strengthened nickel-based superalloy, an alloy device and application thereof.
Background
The production of the Nb-containing solid solution strengthened nickel-based high-temperature alloy, such as GH625 alloy, mainly adopts a duplex smelting process (namely vacuum induction smelting and electroslag remelting) to smelt so as to obtain an electroslag ingot; because the alloying degree of the GH625 alloy is high, the segregation is serious after electroslag remelting, a second phase can be separated out, and the structural form of dendrites is poor in thermoplasticity, homogenization annealing is needed, namely, the elements are uniformly diffused through high-temperature heat preservation, and the second phase which is not favorable for plasticity is eliminated. After the homogenization annealing, free forging cogging, namely multiple upsetting and drawing, is generally adopted to break the dendrites, and the structure is converted into equiaxed grains through dynamic recrystallization, so that the development of subsequent pressure processing is facilitated.
The plasticity of the electroslag ingot is poor, a second phase which is equal to Laves phase, delta phase and MC and unfavorable to plasticity exists, obvious Nb and Mo element segregation exists, and the plasticity is further reduced, so that the cogging success can be realized only by long-time homogenization annealing treatment.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a short-flow homogenization cogging process of Nb-containing solid solution strengthening type nickel-based superalloy, which improves cogging efficiency and quality, and effectively reduces homogenization annealing time by utilizing the deformation characteristic of extruded materials, so that the short-flow homogenization cogging process has short heat preservation time, low energy consumption, high efficiency and better cogging effect.
The invention provides a short-flow homogenization cogging process of Nb-containing solid solution strengthened nickel-based superalloy, which comprises the following steps:
carrying out incomplete homogenization treatment and extrusion cogging on the Nb-containing solid solution strengthened nickel-based superalloy in sequence;
and the extrusion cogging comprises the step of carrying out extrusion treatment on the Nb-containing solid solution strengthened nickel-based high-temperature alloy subjected to the incomplete homogenization treatment, wherein the temperature of the extrusion treatment is 1130-1150 ℃.
Further, the temperature of the extrusion treatment is 1135-1145 ℃;
preferably, the extrusion process further satisfies the following condition: the extrusion speed is 30-50 mm/s, and the extrusion ratio is 4-4.5;
preferably, the extrusion speed is 35-45 mm/s.
Further, the incomplete homogenization treatment includes:
and (3) preserving the heat of the Nb-containing solid solution reinforced nickel-based high-temperature alloy for 4-6 hours at 1100-1120 ℃, and then preserving the heat for 4-6 hours at 1170-1190 ℃.
Further, the incomplete homogenization treatment includes:
heating the Nb-containing solid solution strengthened nickel-based high-temperature alloy to 1100-1120 ℃ at the speed of 7-9 ℃/min, and preserving the heat for 5 hours; then raising the temperature to 1170-1190 ℃ at the speed of 0.5-2 ℃/min, and preserving the temperature for 4-6 hours;
preferably, the incomplete homogenization treatment further comprises: and preserving the heat for 4-6 hours at 1170-1190 ℃, then cooling the Nb-containing solid solution strengthening type nickel-based high-temperature alloy to 500 ℃ along with the furnace, discharging the alloy from the furnace, and cooling the alloy to room temperature.
Further, the Nb-containing solid solution strengthened Ni-based superalloy after incomplete homogenization treatment is subjected to pretreatment and then extrusion treatment, wherein the pretreatment comprises the following steps: sequentially carrying out surface scalping and chamfering on the Nb-containing solid solution strengthened nickel-based superalloy;
preferably, the chamfer includes: rounding the end face of one side, which is contacted with an extrusion die firstly, of the Nb-containing solid solution strengthening type nickel-based high-temperature alloy with the surface peeled off;
preferably, the fillet radius is 3-5 mm.
Further, the extrusion process is carried out in an extruder;
preferably, the Nb-containing solid solution strengthening type nickel-based high-temperature alloy after the incomplete homogenization treatment is heated to 1130-1150 ℃ in a resistance furnace and then placed in an extruder for the extrusion treatment;
preferably, the resistance furnace is preheated to 900 ℃ and then is inductively heated to 1130-1150 ℃;
preferably, the surface of the Nb-containing solid solution strengthened nickel-base superalloy after chamfering treatment is coated with a lubricant and then extruded;
preferably, the lubricant comprises a glass lubricant;
preferably, a glass pad is added between the extrusion die and the Nb-containing solid solution strengthened nickel-based superalloy coated with the lubricant;
preferably, the temperature rise is controlled to be 80-150 ℃ during extrusion.
Further, the Nb-containing solid solution strengthened nickel-base superalloy comprises a GH625 alloy.
An alloy device comprises the Nb-containing solid solution strengthened nickel-base superalloy prepared by the short-flow homogenization cogging process.
The application of the alloy device in the aviation and/or nuclear power field.
An aircraft, distillation tower or nuclear reactor core comprising an alloy device as hereinbefore described.
Compared with the prior art, the invention can at least obtain the following beneficial effects:
the incomplete homogenization treatment can partially homogenize the element distribution in the Nb-containing solid solution strengthening type nickel-based high-temperature alloy, eliminate partial segregation and dendrites, but retain the dendrites so as to be beneficial to the dynamic recrystallization of subsequent cogging. The hot extrusion is in a three-dimensional pressure stress state, the requirement on the plasticity of the alloy is lower than that of free forging cogging, the temperature rise is obvious in the hot extrusion process, and under the combined action of the temperature rise and the pressure stress, the re-dissolution of the incompletely dissolved delta phase in homogenization is promoted; the heat extrusion deformation is large, the dynamic recrystallization is promoted (in addition, partial dendrites are reserved in the homogenization process and can also be used as the nucleation positions of recrystallization), and the element diffusion is accelerated, the segregation is eliminated, and the other reason why the homogenization treatment time can be shortened is also considered; the hot extrusion cogging speed is high, the efficiency is high, and multiple heating times are not needed; in addition, the temperature of the extrusion treatment is 1130-1150 ℃, so that local melting caused by overhigh preheating temperature can be prevented.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one aspect of the present invention, the present invention provides a short-flow homogenization cogging process for Nb-containing solid-solution strengthened nickel-base superalloy, comprising:
carrying out incomplete homogenization treatment and extrusion cogging on the Nb-containing solid solution strengthened nickel-based superalloy in sequence;
and the extrusion cogging comprises the step of carrying out extrusion treatment on the Nb-containing solid solution strengthened nickel-based high-temperature alloy after the incomplete homogenization treatment, wherein the temperature of the extrusion treatment is 1130-1150 ℃ (for example, 1130 ℃, 1140 ℃, 1150 ℃ and the like can be realized).
The incomplete homogenization treatment can partially homogenize the element distribution in the Nb-containing solid solution strengthening type nickel-based high-temperature alloy, eliminate partial segregation and dendrites, but retain the dendrites so as to be beneficial to the dynamic recrystallization of subsequent cogging. The hot extrusion is in a three-dimensional compressive stress state, the requirement on the plasticity of the alloy is lower than that of free forging cogging, the temperature rise is obvious in the hot extrusion process, and under the combined action of the temperature rise and the compressive stress, the re-dissolution of a delta phase (a second phase in the Nb-containing solid solution strengthened nickel-based high-temperature alloy) which is not completely dissolved in homogenization is promoted; the heat extrusion deformation is large, the dynamic recrystallization is promoted (in addition, partial dendrites are reserved in the homogenization process and can also be used as the nucleation positions of recrystallization), and the element diffusion is accelerated, the segregation is eliminated, and the other reason why the homogenization treatment time can be shortened is also considered; the hot extrusion cogging speed is high, the efficiency is high, and multiple heating times are not needed; in addition, the temperature of the extrusion treatment is 1130-1150 ℃, so that local melting caused by overhigh preheating temperature can be prevented.
Note that incomplete homogenization means: the second phase in the alloy is not completely eliminated, the distribution of alloy elements between dendrite stems and dendrites is not completely uniform, and the dendrites have clear interfaces.
Compared with the temperature of the extrusion treatment, when the temperature of the extrusion treatment is less than 1130 ℃, the initial plasticity of the alloy after the incomplete homogenization treatment is insufficient, the extrusion process is easy to crack, the temperature of the extrusion treatment is low, the dynamic recrystallization is not facilitated, the columnar crystal cannot be completely converted into the isometric crystal, the forming performance and the final use performance in the subsequent process are both adversely affected, and when the temperature of the extrusion treatment is more than 1150 ℃, the temperature of the blank is close to the initial melting point of the alloy after the extrusion and the temperature is raised, so that a local liquid phase appears, and the blank is cracked.
In some preferred embodiments of the present invention, the temperature of the extrusion treatment is 1135 to 1145 ℃.
The Nb-containing solid solution strengthening type nickel-based high-temperature alloy realizes solid solution strengthening by adding large-radius atoms such as Nb, Mo and W on the basis of Ni and Cr matrixes, improves the high-temperature strength of the alloy and does not depend on second-phase precipitation strengthening; in some preferred embodiments of the present invention, the Nb-containing solid solution strengthened nickel-base superalloy comprises a GH625 alloy, the GH625 alloy is designated as Inconel625 or UNS N06625, and the mass fractions of the individual components in the GH625 alloy are shown in table 1 below:
TABLE 1
| C | Cr | Mo | Nb(+Ta) | Al | Ti | Fe | Si | Ni |
| ≤0.1 | 21-23 | 8-10 | 3.15-4.15 | ≤0.4 | ≤0.4 | ≤5 | ≤0.5 | Balance of |
In some embodiments of the invention, the extrusion process further satisfies the following condition: the extrusion speed is 30 to 50mm/s (for example, 30mm/s, 35mm/s, 40mm/s, 45mm/s or 50 mm/s), and the extrusion ratio is 4 to 4.5 (for example, 4, 4.1, 4.2, 4.3, 4.4 or 4.5). When the extrusion speed is too low relative to the extrusion speed, the temperature is not increased enough, and the effects of delta phase redissolution and element homogenization cannot be achieved; when the extrusion speed is too high, the dynamic recrystallization is not facilitated, the requirement on the plasticity of the blank is high, the blank is easy to crack, and the initial melting point of the alloy is exceeded due to too high temperature rise; when the extrusion ratio is too small, the deformation is insufficient, the dynamic recrystallization is incomplete, the temperature rise is insufficient, and the effects of delta phase redissolution and element homogenization cannot be achieved; when the extrusion ratio is too large, the requirement on the plasticity of the alloy is high, the alloy is easy to crack, the temperature rise is too large, the initial melting point of the alloy is exceeded, the external load is too large, the alloy is easy to block (cannot be extruded), the required cogging equipment has larger tonnage, and proper extrusion equipment is not necessarily available.
In some embodiments of the invention, the temperature rise in the extrusion process can be controlled to be 80-150 ℃ by the combination of the extrusion temperature, the extrusion speed and the extrusion ratio; on one hand, the delta phase is redissolved by utilizing the interaction of temperature rise and stress, the homogenization time can be shortened, and on the other hand, the temperature rise is beneficial to dynamic recrystallization nucleation and expansion, and a good cogging effect is obtained. The temperature rise must not be too great (i.e. not exceed 150 ℃) to reach the incipient melting temperature (1315 ℃) of the GH625 alloy.
In some preferred embodiments of the invention, the extrusion speed is from 35 to 45 mm/s.
In some embodiments of the invention, the incomplete homogenization treatment comprises:
the Nb-containing solid solution strengthened nickel-based superalloy is subjected to heat preservation for 4 to 6 hours (for example, 4 hours, 4.5 hours, 5 hours, 5.5 hours, or 6 hours) at 1100 to 1120 ℃ (1100 ℃, 1105 ℃, 1110 ℃, 1115 ℃, or 1120 ℃, and the like), and then subjected to heat preservation for 4 to 6 hours (for example, 4 hours, 4.5 hours, 5 hours, 5.5 hours, or 6 hours) at 1170 to 1190 ℃ (1170 ℃, 1175 ℃, 1180 ℃, 1185 ℃, or 1190 ℃, and the like). In the low-temperature homogenization stage, a Laves phase exists in the large-ingot type GH625 alloy, the large-ingot type GH625 alloy is rich in Nb element and is unfavorable for plasticity, the initial melting temperature of the phase is about 1188 ℃, if the phase is not eliminated, the phase is melted by extrusion cogging and temperature rise to crack an ingot, and the phase is largely redissolved to the temperature of about 1100 ℃ of a matrix, so that the main purpose of low-temperature homogenization (namely heat preservation for 4-6 hours at 1100-1120 ℃) is to redissolve the phase; meanwhile, the other precipitated phase-delta phase begins to be dissolved back to the matrix (Ni) at 1100 ℃; the high-temperature homogenization (namely, the heat preservation is carried out for 4 to 6 hours under the condition of 1170 to 1190 ℃) can enable the delta phase to be partially redissolved but not completely redissolved, and can also enable the element distribution in the ingot to be partially homogenized, eliminate partial segregation and dendrites, but retain the dendrites, so as to be beneficial to the dynamic recrystallization of the subsequent cogging.
In some preferred embodiments of the present invention, the incomplete homogenization treatment comprises:
heating the Nb-containing solid solution strengthened nickel-based high-temperature alloy to 1100-1120 ℃ at the speed of 7-9 ℃/min (for example, 7 ℃/min, 8 ℃/min or 9 ℃/min) and preserving the temperature for 5 hours; then raising the temperature to 1170-1190 ℃ at the speed of 0.5-2 ℃/min (such as 0.5 ℃/min, 1 ℃/min, 1.5 ℃/min or 2 ℃/min) and preserving the temperature for 4-6 hours.
In some embodiments of the invention, the incomplete homogenization treatment further comprises: and preserving the heat for 4-6 hours at 1170-1190 ℃, then cooling the Nb-containing solid solution strengthening type nickel-based high-temperature alloy to 500 ℃ along with the furnace, discharging the alloy from the furnace, and cooling the alloy to room temperature. Therefore, excessive internal stress caused by too fast temperature reduction is prevented; further diffusing the elements and improving the homogenization degree.
In some embodiments of the present invention, the Nb-containing solid solution strengthened ni-based superalloy after incomplete homogenization treatment is subjected to a pretreatment and then an extrusion treatment, and the pretreatment comprises: and (3) carrying out surface scalping and chamfering on the Nb-containing solid solution strengthened nickel-based superalloy in sequence. Thereby facilitating the subsequent pressing.
In some embodiments of the invention, the chamfer comprises: and rounding the end face of one side, which is in contact with the extrusion die first, of the Nb-containing solid solution strengthening type nickel-based high-temperature alloy with the surface peeled off, wherein the radius of the rounded corner is 3-5 mm. Therefore, the stress concentration of the contact position of the blank and the die in the extrusion process is reduced, and the cracking is prevented; facilitating the flow of metal at the start of extrusion.
In some embodiments of the invention, the extrusion treatment is performed in an extruder, and preferably, the Nb-containing solid solution strengthening type nickel-based superalloy after the incomplete homogenization treatment is heated to 1130-1150 ℃ in a resistance furnace and then placed in the extruder for the extrusion treatment; preferably, the resistance furnace is preheated to 900 ℃ and then is inductively heated to 1130-1150 ℃. Specifically, when extrusion cogging is performed, a resistance furnace is preheated to 900 ℃, then induction heating is performed to 1130-1150 ℃, at the moment, the temperature of the Nb-containing solid solution strengthening type nickel-based high-temperature alloy after incomplete homogenization treatment is 1130-1150 ℃, and the alloy is sent to an extruder for extrusion treatment.
In some embodiments of the present invention, the Nb-containing solid solution strengthened nickel-base superalloy after the chamfering treatment is extruded after being coated with a lubricant; preferably, the lubricant comprises a glass lubricant; preferably, a glass pad is added at the front end of the extrusion die; the hot extrusion process can be carried out in a closed extrusion cylinder, the surface of the Nb-containing solid solution strengthening type nickel-based superalloy is coated with a glass lubricant, and meanwhile, a glass pad is added between an extrusion die and the Nb-containing solid solution strengthening type nickel-based superalloy coated with the glass lubricant, so that a good heat preservation effect can be achieved, and the Nb-containing solid solution strengthening type nickel-based superalloy cannot be reduced in plasticity due to temperature reduction.
In some embodiments of the present invention, the Nb-containing solid solution strengthened nickel-based superalloy is obtained by vacuum induction melting and electroslag remelting, that is, vacuum induction melting is performed first and then electroslag remelting melting is performed.
In some embodiments of the present invention, a short-run homogenization cogging process comprises the steps of:
1. incomplete homogenization
Feeding the mixture into a furnace at 300 ℃, heating the mixture along with the furnace, raising the temperature to 1100-1120 ℃ at a speed of 8 ℃/min, and preserving the temperature for 5 hours; further heating to 1180 ℃ at the speed of 1 ℃/min, preserving heat for 5 hours, cooling to 500 ℃ along with the furnace, discharging and air cooling to room temperature.
2. Extrusion cogging
1) The surface of the electroslag ingot after incomplete homogenization (namely, the electroslag ingot obtained by vacuum induction smelting and electroslag remelting smelting Nb-containing solid solution strengthening type nickel-based superalloy) is scalped;
2) the end face of one side, which is firstly contacted with the extrusion die, is rounded, and the radius of the rounded corner is 3-5 mm;
3) preheating a resistance furnace to 900 ℃, carrying out induction heating to 1130-1150 ℃, coating a glass lubricant on the surface of the electroslag ingot obtained in the step 2), adding a glass pad at the front end of an extrusion die, and then carrying out extrusion treatment, wherein extrusion parameters are selected: the extrusion speed is 30-50 mm/s, the extrusion ratio is 4-4.5, and the extrusion temperature rise is controlled within 150 ℃;
4) after extrusion, the mixture is cooled to room temperature (for example, 10 to 30 ℃ C.).
In the prior art, homogenization annealing and free forging (upsetting and drawing) cogging are adopted, because delta is unfavorable to a recrystallization process of cogging forging, delta phase must be completely redissolved, element segregation of dendritic crystals is eliminated as much as possible, otherwise plasticity is insufficient, the time of homogenization annealing is long (the total time reaches 40-50 hours), and free forging cogging has the following defects that ① has high requirement on plasticity, homogenization time must be prolonged, otherwise cracking is easy, ② deformation is small, recrystallization is not fully developed, mixed crystals are easy to appear in cast ingots, ③ repeated upsetting and drawing time is long, large ingots even need to be blanked by multiple fire times, and efficiency is low.
In another aspect of the invention, the invention provides an alloy device, which comprises the Nb-containing solid solution strengthening type nickel-base superalloy prepared by the short-flow homogenization cogging process.
It is noted that the alloy device may include, but is not limited to, resistance welded honeycomb structures for engine control unit housings in aircraft engines, fuel lines, hydraulic lines, nozzles, bellows, turbine shrouds, and heat exchanger tubes in environmental control systems; the combustion system transition liner, the turbine seal, the compressor blades and the thrust chamber tube in the aircraft combustion system can also be included; the device also comprises pipelines, reaction vessels, heat exchangers, transmission pipelines and valves in the distillation tower; control rod components in the nuclear reactor core and nuclear power plant pressurized water reactor steam generator heat transfer tubes may also be included.
In another aspect of the invention, the invention provides the use of an alloy device as described above in the aeronautical and/or nuclear power sector.
In another aspect of the invention, there is provided an aircraft, distillation tower or nuclear reactor core comprising an alloy device as hereinbefore described.
It should be noted that the aircraft, the distillation tower, or the nuclear reactor core may include, in addition to the alloy device described above, a structure that the conventional distillation tower or the nuclear reactor core should have, and the aircraft is taken as an example for description, and the aircraft may further include components such as wings and seats, which are not described herein in detail.
Some embodiments of the present invention will be described in detail below with reference to specific examples. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Examples
Example 1
The short-flow homogenization cogging process comprises the following steps:
1. incomplete homogenization
Charging into a furnace at 300 ℃, heating with the furnace, raising the temperature to 1100 ℃ at the speed of 8 ℃/min, and preserving the temperature for 5 hours; further heating to 1180 ℃ at the speed of 1 ℃/min, preserving heat for 5 hours, cooling to 500 ℃ along with the furnace, discharging and air cooling to room temperature.
2. Extrusion cogging
1) The surface of the electroslag ingot after incomplete homogenization (namely, the electroslag ingot obtained by vacuum induction smelting and electroslag remelting smelting Nb-containing solid solution strengthening type nickel-based superalloy) is scalped;
2) the end face of one side, which is firstly contacted with the extrusion die, is rounded, and the radius of the rounded corner is 4 mm;
3) preheating a resistance furnace to 900 ℃, carrying out induction heating to 1130 ℃, 2) coating a glass lubricant on the surface of the electroslag ingot obtained in the step (1), adding a glass pad at the front end of an extrusion die, and then carrying out extrusion treatment, wherein the extrusion parameters are selected as follows: the extrusion speed is 30mm/s, the extrusion ratio is 4, and the extrusion temperature rise is controlled within 150 ℃;
4) and after extrusion, air cooling to room temperature.
Example 2
The short-run homogenization cogging process was the same as example 1 except that the extrusion temperature in step 3) was 1150 ℃.
Example 3
The short-run homogenization cogging process was the same as example 1 except that the extrusion temperature in step 3) was 1140 ℃.
Example 4
The short-run homogenization cogging process was the same as example 1 except that the extrusion speed in step 3) was 50mm/s and the extrusion ratio was 4.5.
Example 5
The short-flow homogenization cogging process is the same as that of example 1, except that the extrusion speed in step 3) is 40mm/s and the extrusion ratio is 4.3.
Example 6
The short-run homogenization cogging process was the same as example 1 except that the extrusion speed in step 3) was 20 mm/s.
Example 7
The short-run homogenization cogging process was the same as example 1 except that the extrusion speed in step 3) was 60 mm/s.
Example 8
The short-run homogenization cogging process was the same as example 1 except that the extrusion ratio in step 3) was 2.
Example 9
The short-run homogenization cogging process was the same as example 1 except that the extrusion ratio in step 3) was 6.
Example 10
The homogenization cogging process is the same as that in example 1, except that the step 1 is complete homogenization, and the specific steps are as follows:
charging into a furnace at 300 ℃, heating with the furnace, raising the temperature to 1100 ℃ at a speed of 8 ℃/min, and preserving the temperature for 20 hours; further heating to 1180 ℃ at the speed of 1 ℃/min, preserving heat for 20 hours, cooling to 500 ℃ along with the furnace, discharging and air cooling to room temperature.
Comparative example 1
The homogeneous cogging process was the same as in example 1, except that the extrusion temperature in step 3) was 1000 ℃.
Comparative example 2
The homogeneous cogging process was the same as in example 1, except that the extrusion temperature in step 3) was 1300 ℃.
The volume ratio of the recrystallized region in the alloy obtained by the uniform cogging process in examples 1 to 10 and comparative examples 1 to 2 (the volume ratio of the recrystallized region is measured by a quantitative metallographic method in which the unrecrystallized region is in an irregular polygon shape and has a large crystal grain size, and the recrystallized grains are fine and have a hexagonal shape; the volume ratio is obtained by measuring the area ratio of the recrystallized grains by the quantitative metallographic method) is shown in table 2 below:
TABLE 2
| Recrystallized region volume ratio (%) | |
| Example 1 | 100 |
| Example 2 | 100 |
| Example 3 | 100 |
| Example 4 | 100 |
| Example 5 | 100 |
| Example 6 | 77 |
| Example 7 | 91 |
| Example 8 | 64 |
| Practice ofExample 9 | Stuffy vehicle |
| Example 10 | 100 |
| Comparative example 1 | Stuffy vehicle |
| Comparative example 2 | Fragmentation of the blank |
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A short-flow homogenization cogging process of Nb-containing solid solution strengthened nickel-based superalloy is characterized by comprising the following steps of:
carrying out incomplete homogenization treatment and extrusion cogging on the Nb-containing solid solution strengthened nickel-based superalloy in sequence;
and the extrusion cogging comprises the step of carrying out extrusion treatment on the Nb-containing solid solution strengthened nickel-based high-temperature alloy subjected to the incomplete homogenization treatment, wherein the temperature of the extrusion treatment is 1130-1150 ℃.
2. The short-process homogenization cogging process of claim 1, wherein the temperature of the extrusion treatment is 1135-1145 ℃;
preferably, the extrusion process further satisfies the following condition: the extrusion speed is 30-50 mm/s, and the extrusion ratio is 4-4.5;
preferably, the extrusion speed is 35-45 mm/s.
3. The short-run homogenization cogging process of claim 1, wherein said incomplete homogenization treatment comprises:
and (3) preserving the heat of the Nb-containing solid solution reinforced nickel-based high-temperature alloy for 4-6 hours at 1100-1120 ℃, and then preserving the heat for 4-6 hours at 1170-1190 ℃.
4. The short-run homogenization cogging process of claim 3, wherein said incomplete homogenization treatment comprises:
heating the Nb-containing solid solution strengthened nickel-based high-temperature alloy to 1100-1120 ℃ at the speed of 7-9 ℃/min, and preserving the heat for 5 hours; then raising the temperature to 1170-1190 ℃ at the speed of 0.5-2 ℃/min, and preserving the temperature for 4-6 hours;
preferably, the incomplete homogenization treatment further comprises: and preserving the heat for 4-6 hours at 1170-1190 ℃, then cooling the Nb-containing solid solution strengthening type nickel-based high-temperature alloy to 500 ℃ along with the furnace, discharging the alloy from the furnace, and cooling the alloy to room temperature.
5. The short-run homogenization cogging process of any one of claims 1 to 4, wherein the Nb-containing solid solution strengthened Ni-based superalloy after incomplete homogenization treatment is subjected to a pretreatment and then an extrusion treatment, and the pretreatment comprises: sequentially carrying out surface scalping and chamfering on the Nb-containing solid solution strengthened nickel-based superalloy;
preferably, the chamfer includes: rounding the end face of one side, which is contacted with an extrusion die firstly, of the Nb-containing solid solution strengthening type nickel-based high-temperature alloy with the surface peeled off;
preferably, the fillet radius is 3-5 mm.
6. The short run homogenization cogging process of any one of claims 1 to 4, wherein said extrusion process is performed in an extruder;
preferably, the Nb-containing solid solution strengthening type nickel-based high-temperature alloy after the incomplete homogenization treatment is heated to 1130-1150 ℃ in a resistance furnace and then placed in an extruder for the extrusion treatment;
preferably, the resistance furnace is preheated to 900 ℃ and then is inductively heated to 1130-1150 ℃;
preferably, the surface of the Nb-containing solid solution strengthened nickel-base superalloy after chamfering treatment is coated with a lubricant and then extruded;
preferably, the lubricant comprises a glass lubricant;
preferably, a glass mat is arranged between the extrusion die and the Nb-containing solid solution strengthened nickel-based superalloy coated with the lubricant;
preferably, the temperature rise is controlled to be 80-150 ℃ during extrusion.
7. The short run homogenization cogging process of claim 1, 2, 3, or 4, wherein the Nb-containing solid solution strengthened Ni-based superalloy comprises a GH625 alloy.
8. An alloy device, characterized in that the alloy device comprises the Nb-containing solid solution strengthening type nickel-base superalloy prepared by the short-flow homogenization cogging process of any one of claims 1 to 7.
9. Use of an alloy device according to claim 8 in the aeronautical and/or nuclear power field.
10. An aircraft, distillation column or nuclear reactor core comprising the alloy device of claim 8.
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| CN112191845A (en) * | 2020-09-18 | 2021-01-08 | 中国航发北京航空材料研究院 | Hot processing method for improving structural uniformity of additive manufacturing nickel-based superalloy |
| CN113969380A (en) * | 2020-07-23 | 2022-01-25 | 宝武特种冶金有限公司 | Manufacturing method of nuclear-grade nickel-based alloy high-performance bar, bar and application |
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| JP2002363673A (en) * | 2001-06-11 | 2002-12-18 | National Institute For Materials Science | Nonmagnetic high strength material |
| CN105331913A (en) * | 2015-12-09 | 2016-02-17 | 兰州理工大学 | Method for thermally extruding and deforming high-temperature alloy Inconel 625 pipe through short process |
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| JP2002363673A (en) * | 2001-06-11 | 2002-12-18 | National Institute For Materials Science | Nonmagnetic high strength material |
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