CN115029523A - Device and method for rapidly eliminating residual stress of high-temperature alloy bar - Google Patents
Device and method for rapidly eliminating residual stress of high-temperature alloy bar Download PDFInfo
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- CN115029523A CN115029523A CN202210970007.0A CN202210970007A CN115029523A CN 115029523 A CN115029523 A CN 115029523A CN 202210970007 A CN202210970007 A CN 202210970007A CN 115029523 A CN115029523 A CN 115029523A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a device and a method for rapidly eliminating residual stress of a high-temperature alloy bar, wherein the device comprises a heat treatment chamber, an isolation plate and a cooling chamber, wherein the isolation plate is arranged between the heat treatment chamber and the cooling chamber, and separates or communicates the heat treatment chamber and the cooling chamber; a bar clamping and automatic tensioning mechanism, a turnover mechanism for turning the bar from the heat treatment chamber to the cooling chamber and a temperature measurement sensor are arranged in the heat treatment chamber, and the turnover mechanism is positioned below the bar; a plurality of bar material placing grooves with inner concave arc-shaped upper surfaces are arranged in the cooling chamber; one side of the heat treatment chamber and one side of the cooling chamber are connected with an inert gas storage tank through gas pipelines, and the other sides of the heat treatment chamber and the cooling chamber are connected with a pumping and exhausting gas pipe.
Description
Technical Field
The invention belongs to the field of new equipment and new material manufacturing, and relates to a device and a method for quickly eliminating residual stress of a high-temperature alloy bar.
Background
The high-temperature alloy cold-drawn rod is a raw material for manufacturing fasteners in the fields of aerospace, nuclear power energy and the like. In order to obtain the requirements of precise size, higher strength, fine grains and the like of a specific specification, one or more times of cold drawing are needed, and in the process, larger residual internal stress is generated inside the bar. The residual stress can cause material fracture, deformation or dimensional change, and the residual stress also improves the chemical activity of the metal, and particularly easily causes intergranular corrosion cracking under the action of the residual tensile stress. In addition, for the material needing drawing for many times, the hardness of the bar material after each drawing can be obviously improved, so that the next drawing is difficult. Therefore, the special alloy bar subjected to cold drawing needs to be subjected to stress relief softening annealing treatment, but the annealing furnace stress relief annealing of the high-temperature alloy cold-drawn bar at present has the following problems:
1. the heating and the heat preservation need longer time, the stress relief annealing cost is high, and the production efficiency is low. And for the special alloy without second phase particle pinning, the grain size of the edge part of the bar with serious cold deformation is abnormally increased, so that the structure performance is unqualified.
2. In the annealing, surface oxidation occurs in a gas heating or resistance belt heating furnace, and reoxidation occurs in water cooling, so that pickling or scalping is required to remove surface scale before drawing.
3. For high-temperature alloy containing Al and Ti strengthening elements, a large amount of gamma' strengthening phase can be separated out in the range of 750-900 ℃ in the heating annealing treatment process of a furnace, and structural stress is generated by superposition, so that transverse cracks and longitudinal cracks on the surface of an annealed bar are caused.
4. When the bar is placed in a furnace for heating, the bar is extremely easy to be over-bent due to the adoption of multi-point supporting force bearing, and the subsequent straightening difficulty is high.
In the prior art, for example, patent numbers CN112453298A and CN113042565A require acid washing treatment, and CN104480415A requires polishing treatment.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a device and a method for quickly eliminating residual stress of a high-temperature alloy bar, and the specific technical scheme is as follows:
a device for rapidly eliminating residual stress of a high-temperature alloy bar comprises a transformer 3, a heat treatment chamber 5, an isolation plate 7 and a cooling chamber 6, wherein the isolation plate 7 is arranged between the heat treatment chamber 5 and the cooling chamber 6, and the heat treatment chamber 5 and the cooling chamber 6 are separated or communicated by the isolation plate 7; a bar clamping and automatic tensioning mechanism 1, a turnover mechanism 2 for turning the bar from the heat treatment chamber to a cooling chamber and a temperature measurement sensor 12 are arranged in the heat treatment chamber 5, and the turnover mechanism 2 is positioned below the bar; the bar clamping and automatic tensioning mechanism 1 is connected with a transformer 3 through a cable 4; one side of the heat treatment chamber 5 and one side of the cooling chamber 6 are both connected with an inert gas storage tank 11 through a gas pipeline 9, and the other sides are both connected with a pumping and exhausting gas pipe 8.
The bar clamping and automatic tensioning structure 1 has an automatic tensioning function, and can clamp two ends of a bar and apply axial tension to tension the bar. By adopting the structure, the problems that in the prior art, the bar is extremely easy to be excessively bent due to multi-point support, and the subsequent straightening difficulty is high can be solved.
Further, the bar clamping and automatic tensioning mechanism 1 consists of 2 upper clamping plates, 2 lower clamping plates, a tensioning cylinder, 2 clamping cylinders and a support; the right end of the support can be stretched and fixed, the fixed end of the support is fixedly provided with a first upper clamping plate 19 and a first lower clamping plate 18, and the first upper clamping plate 19 and the first lower clamping plate 18 are connected with a first clamping cylinder 20 and can be opened and closed up and down to clamp the bar; the right end of the support 17 is provided with a second upper clamping plate 13, a second lower clamping plate 14, a second clamping cylinder 15 and a tensioning cylinder 16, the support 17 is connected with the tensioning cylinder 16 through a pin shaft 24 and stretches under the action of the tensioning cylinder 16, the second lower clamping plate 14 is fixed on the support 17, the second upper clamping plate 13 is connected with the second clamping cylinder 15 and matched with the second lower clamping plate 14 to clamp the bar, and when the bar is clamped, the tensioning cylinder 16 applies force outwards to tension the bar.
The distance between the temperature sensor 12 and the first or second lower clamping plate is 300-500mm, and the distance between the head of the temperature sensor and the bar is 90-110 mm;
preferably, one structure of the turnover mechanism 2 is composed of a bearing shaft 21 and more than two slide blocks 22 with slopes, which penetrate and are fixed on the bearing shaft, and bearing shaft supports 23 are arranged at two ends of the bearing shaft, wherein one high end of each slide block is positioned right below the bar material, and one low end of each slide block is fixed on the bottom surface in the heat treatment chamber.
Another structure of turnover mechanism 2 can be by a bearing axle 21 with run through and fix the epaxial more than two sliders 22 of bearing and constitute, the both ends of bearing axle are equipped with bearing axle support 23, the preferred bar-shaped structure of slider this moment, the slider is equipped with the one end of baffle and surpasss the rod body in the rod vertical direction, when the rod heating was accomplished, the slider can rely on the bearing axle rotation to overturn the rod to cooling chamber 6.
A method for rapidly eliminating residual stress of a high-temperature alloy bar comprises the following steps:
step 1: placing the bar to be processed on a bar clamping and automatic tensioning mechanism, clamping and tensioning the bar, setting the tensioning force to be 1000-plus 2000N, closing the heat treatment chamber, and filling inert gas into the heat treatment chamber until the pressure in the chamber reaches 11 multiplied by 10 4 -12×10 4 Pa；
Step 2: setting the voltage of a transformer to be 30-50V or setting the current to be 2000-4000A, switching on and electrifying to heat the bar to be treated, and stopping heating when the bar is heated to the specified solid solution temperature;
and step 3: the division plate is lifted up, so that the heat treatment chamber is communicated with the cooling chamber, the bar after being heated is turned to the cooling chamber by the turnover mechanism, the rear division plate falls down, the heat treatment chamber is separated from the cooling chamber, 15-25 ℃ of inert gas is introduced into the cooling chamber, meanwhile, the exhaust pipe on one side of the cooling chamber is opened, and stress removal on the bar is completed after cooling is completed.
The inert gas in step 1 is argon.
Further, in the step 2, the specific resistance and temperature relation rho = rho 0(1+ aT) of the special alloy is utilized, wherein rho and rho 0 are the specific resistance aT T ℃ and 0 ℃ respectively, and alpha is the temperature coefficient of the specific resistance, and the special alloy cold-drawn rod to be subjected to stress relief annealing is loaded through low voltage or high current to reach the specified solid solution temperature within 25 s. The specified fixed temperature is reached in a very short time, and the problems of structural stress superposition, surface oxidation, serious bending, low efficiency, high cost and the like caused by abnormal growth of crystal grains and precipitation of strengthening phases are avoided.
In the step 3, the inert gas is argon.
The invention develops an innovative device and a using method thereof, and the principle is that a cold-drawn special alloy bar which is subjected to cold-working hardening is rapidly heated and rapidly relieved of stress by using a resistance thermal effect in a protective atmosphere environment, then is rapidly cooled by using inert gas reinforcement, and simultaneously is pre-set with tensile stress to reduce bending of the bar in a stress relieving process, so that the problems of abnormal growth of grains, serious surface oxidation, serious bar bending, low production efficiency and the like which are easily caused in the stress relieving annealing process of the special alloy bar in the cold drawing process are solved. The stress removing method of the invention skillfully utilizes the relationship rho between the resistivity and the temperature of the special alloy t =ρ 0 (1+ aT) in which ρ t And rho 0 The electrical resistivity is T ℃ and 0 ℃, alpha is the temperature coefficient of the electrical resistivity, and the electrical resistivity is loaded on a special alloy bar to be subjected to stress relief annealing through low voltage or high current so as to enable the special alloy bar to reach the specified annealing temperature within 25 s. Because the special alloy bar reaches the specified annealing temperature in a very short time, the abnormal growth of crystal grains can be effectively avoided, because the heating time is very short and the crystal grains are not long enough to grow; meanwhile, the surface oxidation is effectively avoided, the time is extremely short, and the inert gas is used for protection; the bending severity can be avoided, and the bar is always under the condition of the preset tensile stress; in addition, the problems of low efficiency, high cost and the like are solved, and the bar can be directly cooled without soaking treatment in the prior art, because the temperature of different sections of the bar is uniform. The invention has short overall process time and ensures the subsequent processing quality of the bar. The stress removing treatment can be carried out on large-size rods with the diameter of 5-40mm and the length of 2-6 m.
Drawings
FIG. 1 is a first schematic view of an apparatus of the present invention;
FIG. 2 is a second schematic diagram of the apparatus of the present invention;
FIG. 3 is a schematic view of the bar clamping and automatic tensioning mechanism of the present invention;
FIG. 4 is a schematic view of a canting mechanism of the present invention;
fig. 5 is a comparison of bars before and after treatment according to example 2 of the invention, the left figure being before treatment and the right figure being after treatment.
Wherein 1-bar clamping and automatic tensioning mechanism; 2-turning over mechanism; 3-a transformer; 4-a cable; 5-a heat treatment chamber; 6-a cooling chamber; 7-a separation plate; 8-pumping and exhausting the air pipe; 9-gas line; 10-a gas cooler; 11- -inert gas storage tank; 12-a temperature sensor; 13-a second upper clamping plate; 14-a second lower clamping plate; 15-a second clamping cylinder; 16-a tensioning cylinder; 17-a scaffold; 18-a first lower clamping plate; 19-a first upper clamping plate; 20-a first clamping cylinder; 21-a load bearing shaft; 22-a slide block; 23-a load bearing shaft support; and 24-pin shaft.
Detailed Description
Example 1
A device for rapidly eliminating residual stress of a high-temperature alloy bar comprises a transformer 3, a heat treatment chamber 5, an isolation plate 7 and a cooling chamber 6, wherein the isolation plate 7 is arranged between the heat treatment chamber 5 and the cooling chamber 6, and the isolation plate 7 separates or communicates the heat treatment chamber 5 and the cooling chamber 6; a bar clamping and automatic tensioning mechanism 1, a turnover mechanism 2 for turning the bar from the heat treatment chamber to a cooling chamber and a temperature measurement sensor 12 are arranged in the heat treatment chamber 5, and the turnover mechanism 2 is positioned below the bar; the bar clamping and automatic tensioning mechanism 1 is connected with a transformer 3 through a cable 4; one side of the heat treatment chamber 5 and one side of the cooling chamber 6 are both connected with an inert gas storage tank 11 through a gas pipeline 9, and the other sides are both connected with a pumping and exhausting gas pipe 8.
As shown in fig. 3, the bar clamping and automatic tensioning mechanism 1 consists of 2 upper clamping plates, 2 lower clamping plates, a tensioning cylinder, 2 clamping cylinders and a support; the right end of the support can be stretched and fixed, the fixed end of the support is fixedly provided with a first upper clamping plate 19 and a first lower clamping plate 18, and the first upper clamping plate 19 and the first lower clamping plate 18 are connected with a first clamping cylinder 20 and can be opened and closed up and down to clamp the bar; the right end of the support 17 is provided with a second upper clamping plate 13, a second lower clamping plate 14, a second clamping cylinder 15 and a tensioning cylinder 16, the support 17 is connected with the tensioning cylinder 16 through a pin shaft 24 and stretches under the action of the tensioning cylinder 16, the second lower clamping plate 14 is fixed on the support 17, the second upper clamping plate 13 is connected with the second clamping cylinder 15 and matched with the second lower clamping plate 14 to clamp the bar, and when the bar is clamped, the tensioning cylinder 16 applies force outwards to tension the bar.
As shown in fig. 4, the turnover mechanism 2 is composed of a bearing shaft 21 and two or more sliding blocks 22 penetrating and fixed on the bearing shaft, bearing shaft supports 23 are arranged at two ends of the bearing shaft, the sliding blocks are preferably rod-shaped structures, one ends of the sliding blocks, provided with baffles, exceed the rod body in the vertical direction of the rod, and when the rod is heated, the sliding blocks can turn the rod to the cooling chamber 6 by means of the rotation of the bearing shaft.
The other structure of the turnover mechanism 2 is composed of a bearing shaft 21 and more than two slide blocks 22 with slopes, wherein the slide blocks are penetrated and fixed on the bearing shaft, bearing shaft supports 23 are arranged at two ends of the bearing shaft, one high end of each slide block is positioned right below the bar, and the other low end of each slide block is fixed on the inner bottom surface of the heat treatment chamber.
Example 2
The residual stress removing treatment is carried out on the high-temperature alloy bar by utilizing the device for rapidly eliminating the residual stress of the high-temperature alloy bar as shown in figures 1 and 2. Firstly, opening a heat treatment chamber 5, placing GH4169 with the diameter phi =18mm and the length =3m of a bar to be treated at two ends of a bar clamping and automatic tensioning mechanism 1 for clamping and re-tensioning, setting the tensioning force to be 1200N, and closing the heat treatment chamber 5;
then, opening an inflation valve of the heat treatment chamber 5 on the gas pipeline 9, setting inflation flow to be 10L/min, starting to inflate inert gas into the heat treatment chamber 5, and preparing to start heating when the oxygen content is displayed by the oxygen alarm instrument to be 20 ppm;
and setting the voltage of the transformer 3 to be 30V, switching on and electrifying, starting to heat the bar, feeding back the temperature of the bar in real time by the temperature measuring sensor 12, and stopping heating for 18s when the temperature of the bar is heated to about 970 ℃ after the temperature of the transformer 3 is heated to the specified solid solution temperature. The isolation plate 7 is lifted, the turnover mechanism 2 turns the heated bar material into the cooling chamber 6, and the isolation plate 7 falls down; opening an inflation valve of a cooling chamber 6 on a gas pipeline 9, setting inflation flow rate to be 50L/min, cooling inert gas to 15-25 ℃ through a gas cooler 10, filling the inert gas into the cooling chamber 6, and opening a pumping exhaust pipe 8 to form flowing cold air flow to rapidly cool the bar; and after cooling, opening the cooling chamber 6, taking away the bar, closing the cooling chamber 6 and finishing primary heat treatment.
The GH4169 cold-drawn rod processed by the technology keeps a straight state, the straightness is 4mm/m, the edge part of the surface is free from abnormal long grains in the tissue inspection, the grains of the cross section are uniform, the range is less than 2, the hardness is reduced from 52HRC before annealing to 42HRC, the softening effect is good, the surface keeps a silvery state, and the cold-drawn rod can be directly lubricated for next drawing. The grain size of the bars before and after treatment was found to be almost unchanged by comparison, as shown in fig. 5.
Example 3
The heat treatment chamber 5 is opened, and the bar to be treated: c276 with the diameter phi =30mm and the length =5m is placed on the clamping plates at the two ends of the bar clamping and automatic tensioning mechanism 1, clamped and tensioned again, the tensioning force is set to be 1500N, and the heat treatment chamber 5 is closed;
then opening an inflation valve of the heat treatment chamber 5 on the gas pipeline 9, setting inflation flow to be 10L/min, starting to inflate inert gas into the heat treatment chamber 5, and preparing to start heating when the oxygen content is displayed by the oxygen alarm instrument to be 20 ppm;
setting the voltage of the transformer 3 to be 25V, switching on and electrifying, starting to heat the bar, feeding back the temperature of the bar in real time by the temperature measuring sensor 12, and stopping heating for 22s when the temperature of the bar is about 980 ℃ after the bar is heated to the specified solid solution temperature and the transformer 3 is disconnected. The isolation plate 7 is lifted, the turnover mechanism 2 turns the heated bar material into the cooling chamber 6, and the isolation plate 7 falls down; opening an inflation valve of a cooling chamber 6 on a gas pipeline 9, setting inflation flow to be 50L/min, cooling inert gas to 15-25 ℃ through a gas cooler 10, filling the inert gas into the cooling chamber 6, and opening a pumping exhaust pipe 8 to form flowing cold air flow to rapidly cool the bars; and after cooling, opening the cooling chamber 6, taking away the bar, closing the cooling chamber 6 and finishing primary heat treatment.
The C276 cold-drawn rod processed by the technology keeps a straight state, the straightness is 3mm/m, the edge part of the surface is free from abnormal growing grains in the tissue inspection, the hardness is reduced from 55HRC to 44HRC before annealing, the softening effect is good, the surface keeps a silvery state, and the cold-drawn rod can be directly lubricated for next drawing.
Example 4
Opening the heat treatment chamber 5, and enabling the bar material GH2132 to be treated to have the diameter phi of 8 mm; the length of the rod material is 6m, the rod material is placed on clamping plates at two ends of the rod material clamping and automatic tensioning mechanism 1, clamping and tensioning are carried out again, the tensioning force is set to be 1000N, and the heat treatment chamber 5 is closed;
then opening an inflation valve of the heat treatment chamber 5, setting the inflation flow to be 10L/min, starting to inflate the inert gas into the heat treatment chamber 5, and preparing to start heating when the oxygen content is displayed by the oxygen alarm instrument to be 20 ppm;
setting the voltage of the transformer 3 to be 45V, switching on and electrifying, starting to heat the bar, feeding back the temperature of the bar in real time by the temperature measuring sensor 12, and stopping heating when the temperature is heated to the specified solid solution temperature which is about 980 ℃ and the transformer 3 is disconnected, wherein the total time is 15 s. The isolation plate 7 is lifted, the bar material turning mechanism 2 turns the heated bar material into the cooling chamber 6, and the isolation plate 7 falls down; opening an inflation valve of the cooling chamber 6, setting inflation flow to be 50L/min, cooling inert gas to 15-25 ℃ through a gas cooler 9, filling the inert gas into the cooling chamber 6, and opening a pumping exhaust pipe 8 to form flowing cold air flow to rapidly cool the bar; and after cooling, opening the cooling chamber 6, taking away the bar, closing the cooling chamber 6, and finishing primary heat treatment.
The GH2132 cold-drawn rod treated by the technology keeps a straight state, the straightness is 4mm/m, the edge part of the surface is free from abnormal growing large grains in tissue inspection, the hardness is reduced from 50HRC to 40HRC before annealing, the softening effect is good, and the surface keeps a silvery state. And (4) directly carrying out fine grinding on the material by using a centerless grinding machine, and warehousing after reaching the dimensional tolerance.
Claims (9)
1. The device for rapidly eliminating the residual stress of the high-temperature alloy bar is characterized by comprising a transformer (3), a heat treatment chamber (5), an isolation plate (7) and a cooling chamber (6), wherein the isolation plate (7) is arranged between the heat treatment chamber (5) and the cooling chamber (6), and the heat treatment chamber (5) and the cooling chamber (6) are separated or communicated by the isolation plate (7); a bar clamping and automatic tensioning mechanism (1), a turnover mechanism (2) for turning the bar from the heat treatment chamber to the cooling chamber and a temperature measurement sensor (12) are arranged in the heat treatment chamber (5); the bar clamping and automatic tensioning mechanism (1) is connected with the transformer (3) through a cable (4); one side of the heat treatment chamber (5) and one side of the cooling chamber (6) are both connected with an inert gas storage tank (11) through a gas pipeline (9), and the other sides are both connected with a pumping and exhausting gas pipe (8).
2. The apparatus for rapidly relieving residual stress of a superalloy bar according to claim 1, wherein: the bar clamping and automatic tensioning mechanism (1) has an automatic tensioning function, and can clamp two ends of a bar and apply axial tension to tension the bar.
3. The apparatus for rapidly eliminating the residual stress of the superalloy bar according to claim 2, wherein the bar clamping and automatic tensioning mechanism (1) is composed of 2 upper clamping plates, 2 lower clamping plates, a tensioning cylinder, 2 clamping cylinders and a bracket; one end of the support can stretch out and draw back, the other end of the support is fixed, a first upper clamping plate (19) and a first lower clamping plate (18) are fixedly arranged at the fixed end of the support, and the first upper clamping plate (19) and the first lower clamping plate (18) are connected with a first clamping cylinder (20) and can be opened and closed up and down to clamp the bar; support (17) one end that can stretch out and draw back is equipped with clamp plate (13) on the second, clamp plate (14) under the second, second die clamping cylinder (15) and tensioning cylinder (16), support (17) are connected with tensioning cylinder (16) through round pin axle (24), stretch out and draw back under tensioning cylinder (16) effect, clamp plate (14) are fixed on support (17) under the second, clamp plate (13) are connected with second die clamping cylinder (15) and make the rod press from both sides tightly with clamp plate (14) cooperation under the second on the second, when the rod presss from both sides tightly, outside application of force of tensioning cylinder (16), there is the effect of tensioning to the rod.
4. The apparatus for rapidly relieving residual stress of a superalloy bar according to claim 3, wherein the head of the temperature sensor (12) is 90-110mm from the bar.
5. The apparatus for rapidly relieving residual stress of a superalloy bar according to claim 1, wherein the turnover mechanism (2) is located below the bar; the turnover mechanism (2) consists of a bearing shaft (21) and more than two sliding blocks (22) which penetrate through and are fixed on the bearing shaft (21).
6. A method for rapidly eliminating the residual stress of a high-temperature alloy bar by using the device for rapidly eliminating the residual stress of the high-temperature alloy bar according to any one of claims 1 to 5, which is characterized by comprising the following steps:
step 1: placing the bar to be processed on a bar clamping and automatic tensioning mechanism (1), clamping and tensioning the bar, setting the tensioning force to be 1000-2000N, closing the heat treatment chamber (5), and filling inert gas into the heat treatment chamber (5) until the pressure in the chamber reaches 11 x 10 4 -12×10 4 Pa；
Step 2: setting the voltage of the transformer (3) to be 30-50V or setting the current to be 2000-4000A, switching on and electrifying to heat the bar material to be treated, and stopping heating when the bar material is heated to the specified solid solution temperature;
and step 3: the isolation plate (7) is lifted up, so that the heat treatment chamber (5) is communicated with the cooling chamber (6), the bar is clamped and the automatic tensioning mechanism (1) loosens the bar, the bar is overturned to the cooling chamber (6) by the overturning mechanism (2), the isolation plate (7) falls down, so that the heat treatment chamber (5) is separated from the cooling chamber (6), 15-25 ℃ of inert gas is introduced into the cooling chamber (6), the exhaust pipe (8) on one side of the cooling chamber (6) is opened at the same time, and stress removal of the bar is completed after cooling is completed.
7. The method of claim 6, wherein the inert gas in step 1 is argon.
8. The method for rapidly eliminating the residual stress of the superalloy bar as in claim 6, wherein the specific alloy resistivity and temperature relationship ρ T = ρ 0(1+ aT) is utilized in step 2, where ρ T and ρ 0 are the resistivity aT T ℃ and 0 ℃ respectively, and α is the temperature coefficient of the resistivity, and the bar is loaded to the treated bar by setting the voltage to 30-50V or setting the current to 2000-4000A, so that the bar reaches the specified solid solution temperature within 25 s.
9. The method of claim 6, wherein the inert gas in step 3 is argon.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115976438A (en) * | 2022-12-28 | 2023-04-18 | 西安圣泰金属材料有限公司 | Annealing and straightening equipment and annealing and straightening method for titanium alloy bar for ultrasonic scalpel |
| CN116426735A (en) * | 2023-04-27 | 2023-07-14 | 吉林大学 | Rapid heat treatment equipment and method for metal bar |
| CN116426735B (en) * | 2023-04-27 | 2024-04-30 | 吉林大学 | Rapid heat treatment equipment and method for metal bar |
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