CN115354126A - Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field - Google Patents
Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field Download PDFInfo
- Publication number
- CN115354126A CN115354126A CN202210974705.8A CN202210974705A CN115354126A CN 115354126 A CN115354126 A CN 115354126A CN 202210974705 A CN202210974705 A CN 202210974705A CN 115354126 A CN115354126 A CN 115354126A
- Authority
- CN
- China
- Prior art keywords
- metal material
- cryogenic
- temperature
- liquid nitrogen
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007769 metal material Substances 0.000 title claims abstract description 114
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 238000003860 storage Methods 0.000 claims abstract description 31
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 36
- 238000009413 insulation Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 22
- 239000013078 crystal Substances 0.000 description 13
- 239000010410 layer Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910002065 alloy metal Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- QZLYKIGBANMMBK-DYKIIFRCSA-N 5β-androstane Chemical compound C([C@H]1CC2)CCC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CCC[C@@]2(C)CC1 QZLYKIGBANMMBK-DYKIIFRCSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
-
- 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
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a method for improving the obdurability of a metal material by utilizing a cryogenic electromagnetic composite field, which comprises the following steps: mounting a metal material in a cryogenic treatment tank, winding an excitation coil, and enabling the excitation coil not to be in contact with the metal material; communicating the cryogenic treatment box with a liquid nitrogen storage tank, and connecting the metal material with a pulse current generator; connecting the excitation coil with a pulse magnetic field generator; conveying liquid nitrogen into the cryogenic treatment box to monitor the temperature in the box in real time, setting the temperature threshold value to be the liquid nitrogen temperature of-196 ℃, and keeping the temperature in the cryogenic treatment box at the temperature threshold value for 1-2 hours; setting parameters of a pulse current generator and a pulse magnetic field generator, and opening the pulse current generator and the pulse magnetic field generator; and (3) closing the pulse current generator and the pulse magnetic field generator, closing a switch of the liquid nitrogen storage tank, taking out the metal material, and performing heating treatment at room temperature until the room temperature. The invention carries out electromagnetic composite field treatment on the metal material in the cryogenic environment, and can improve the toughness of the metal material.
Description
Technical Field
The invention belongs to the technical field of material strengthening and toughening treatment, and particularly relates to a method and a device for improving the strength and toughness of a metal material by using a cryogenic electromagnetic composite field.
Background
In the industrial production process, along with the increase of the cold working deformation degree, the work hardening degree of the metal material is obviously increased, which is expressed by the reduction of plasticity and the improvement of strength and hardness, and the metal material is usually processed continuously by carrying out a plurality of times of intermediate annealing treatment (such as bell-type or box-type isothermal annealing) or the structure and the performance of the material are regulated and controlled by the annealing of a finished product. However, the traditional isothermal annealing mode has the problems of low production efficiency, long treatment period, poor product surface quality, uneven structure performance, high cost and the like.
In recent years, researchers at home and abroad have conducted a great deal of research on the influence of pulse current on the recrystallization behavior of cold-worked metals (Cu and its alloys, aluminum alloys, magnesium alloys, titanium alloys, etc.). The result shows that the pulse current can obviously promote the recrystallization process, postpone the formation of annealing twin crystals, hinder the growth of recrystallized grains, have obvious grain refining effect and are beneficial to improving the processability and the toughness of the material. However, in the conventional electric pulse treatment process, joule heat generated by the current and external conditions affect the temperature, and the temperature has randomness, so that the method has certain limitation on quantitative research on the performance of the material, and is not favorable for accurate application to industrial production and processing.
The material electromagnetic preparation is to apply an electromagnetic field to links such as material preparation, processing and the like, and to regulate and control the organization and the performance of the material by using the magnetic field, and has become a new research hotspot in the material field. With the continuous and intensive research, a plurality of new magnetic phenomena are continuously discovered, and the magnetic field has remarkable progress and performance control in the aspect of regulating and controlling the mechanical performance of the material. And in a cryogenic environment, the stacking fault energy of the metal material is reduced, a large amount of twin crystals can be generated, and the twin crystals are beneficial to the performance reinforcement of the material. Therefore, it is necessary to develop a method for improving the toughness of metal materials by using a cryogenic electromagnetic composite field.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for improving the obdurability of a metal material by utilizing a cryogenic electromagnetic composite field, aiming at overcoming the defects of low obdurability matching degree of a plurality of metal materials.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for improving the obdurability of a metal material by utilizing a cryogenic electromagnetic composite field comprises the following steps:
s1, mounting a metal material on a sample clamp in a cryogenic treatment box, winding an excitation coil on the periphery of the metal material, and enabling the excitation coil not to be in contact with the metal material; communicating the cryogenic treatment tank with a liquid nitrogen storage tank, and connecting the metal material with a pulse current generator; connecting the excitation coil with a pulse magnetic field generator;
s2, opening a switch of a liquid nitrogen storage tank, and conveying liquid nitrogen into the cryogenic treatment tank; monitoring the temperature in the cryogenic treatment tank in real time by a temperature sensor in the cryogenic treatment tank, setting the temperature threshold to be liquid nitrogen temperature-196 ℃, and continuously introducing liquid nitrogen before reaching the temperature threshold; after the temperature threshold is reached, closing a liquid nitrogen storage tank switch and a pressure increasing valve controller to keep the temperature in the cryogenic treatment tank at the temperature threshold for 1-2 h;
s3, after the temperature in the cryogenic treatment box is stable, setting parameters of a pulse current generator and a pulse magnetic field generator, and turning on the pulse current generator and the pulse magnetic field generator;
and S4, after the electromagnetic composite field treatment is finished, closing the pulse current generator and the pulse magnetic field generator, closing a switch of the liquid nitrogen storage tank, taking out the metal material, and performing temperature rise treatment at room temperature until the room temperature.
In the above solution, the set parameters of the pulse current generator include: the current is 0-500A, the pulse frequency is 50HZ, and the impact time is 0-2 s; the set parameters of the pulsed magnetic field generator include: the magnetic field intensity is 0-1T, and the energizing time is 0-2 s.
In the scheme, the subzero treatment in the step S2 is reduced from room temperature, and the cooling speed is 5-10 ℃ 5555.
In the above embodiment, the temperature increase rate in step S4 is 5 to 10 ℃ 5555.
Correspondingly, the invention also provides a device for improving the toughness of the metal material by using the cryogenic electromagnetic composite field, which is used for realizing the method for improving the toughness of the metal material by using the cryogenic electromagnetic composite field, and the device comprises a cryogenic treatment box, a liquid nitrogen storage tank, a pulse current generator, a pulse magnetic field generator and a computer system which are arranged outside the cryogenic treatment box, and a sample clamp and a temperature sensor which are arranged outside the cryogenic treatment box; the liquid nitrogen storage tank is communicated with the cryogenic treatment tank through a liquid nitrogen guide pipe, and a storage tank switch, a booster valve controller and a flow control valve are arranged on the liquid nitrogen guide pipe; the metal material to be processed is arranged on the sample clamp, an excitation coil is wound on the periphery of the metal material and is not in contact with the metal material, the metal material is connected with a pulse current generator, and the excitation coil is connected with a pulse magnetic field generator; and the temperature sensor, the pressure increasing valve controller and the flow control valve are respectively connected with a computer system.
In the scheme, the sample clamp comprises two U-shaped clamping grooves which are oppositely arranged, and two ends of a metal material are respectively arranged in the U-shaped clamping grooves and are fixed through a first bolt; the two U-shaped clamping grooves are respectively connected with the positive electrode and the negative electrode of the pulse current generator so as to conduct current to the metal material; the distance between the two U-shaped clamping grooves can be adjusted to adapt to metal materials with different sizes.
In the scheme, two metal guide rails are arranged in the deep cooling treatment tank at intervals, a metal sliding block is arranged on each of the two metal guide rails, the two metal sliding blocks are connected with the two U-shaped clamping grooves through metal supports respectively, and the metal sliding blocks can move on the metal guide rails to adjust the distance between the two U-shaped clamping grooves; the bottom parts of the two metal guide rails are respectively provided with a conductive block, and the two metal slide blocks are respectively connected with the positive electrode and the negative electrode of the pulse current generator through leads.
In the scheme, the outer surface of the cryogenic treatment tank is provided with the heat insulation layer.
In the scheme, the heat insulation layer is a heat insulation metal material film coated on the outer surface of the cryogenic treatment box.
In the scheme, the interface of the cryogenic treatment tank connected with other components is sealed by sealant, so that heat transfer is prevented.
The invention has the beneficial effects that:
1. according to the invention, the electromagnetic composite field is adopted to carry out strengthening treatment on the metal material in the cryogenic environment, the electric field and the magnetic field are coupled in the cryogenic environment, the metal material can generate a twin crystal structure in the cryogenic environment, the twin crystal is beneficial to improving the plasticity of the metal material, and the material can keep good toughness in the electromagnetic composite field treatment. The metal material generates vibration in a dynamic magnetic field to form plastic deformation, and when pulse current is applied in the deformation process, the rheological stress is greatly reduced due to the electro-plastic effect, so that the diffusion of atoms and the slippage of crystal boundaries are facilitated, and the redistribution of dislocation and the structural change are caused. On the basis of independent electric field treatment and magnetic field treatment, the two are fused together, so that the mechanical and mechanical properties of the composite material can be improved to a greater extent, and the strength of the composite material is improved while the better elongation is ensured.
2. The invention can ensure the accuracy of the treatment process and improve the reliability of the application to the metal processing process by accurately monitoring the temperature in the deep cooling treatment box in real time.
3. The invention strengthens the metal material from the surface to the inside, but not strengthens the surface layer of the material.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of an apparatus for improving toughness of a metal material by using a cryogenic electromagnetic composite field, which is adopted in the method of the present invention;
FIG. 2 is a graph of yield strength after treatment with a cryogenic electromagnetic composite field in an ambient temperature environment in accordance with an embodiment of the present invention;
FIG. 3 is a graph of elongation after treatment with a cryogenic electromagnetic composite field in an ambient temperature environment in accordance with an embodiment of the present invention.
In fig. 1: 1. a liquid nitrogen storage tank; 2. a storage tank switch; 3. a liquid nitrogen conduit; 4. a pressure increasing valve controller; 5. a flow control valve; 6. a cryogenic treatment tank; 7. a thermal insulation layer; 8. a temperature sensor; 9. a first bolt; 10. a sample clamp; 11. a metal slider; 12. a metal guide rail; 13. a conductive block; 14. a wire; 15. a second bolt; 16. a pulse current generator; 17. a computer system; 18. a metallic material sample; 19. a field coil; 20. a pulsed magnetic field generator.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The invention provides a method for improving the toughness of a metal material by utilizing a cryogenic electromagnetic composite field, which comprises the following steps of:
s1, mounting a metal material on a sample clamp 10 in a cryogenic treatment box 6, winding an excitation coil 19 on the periphery of the metal material, and enabling the excitation coil 19 not to be in contact with the metal material; communicating a cryogenic treatment tank 6 with a liquid nitrogen storage tank 1, and connecting a metal material with a pulse current generator 16; connecting the excitation coil 19 with a pulsed magnetic field generator 20; then the subzero treatment box 6 is closed;
s2, opening a storage tank switch, and conveying liquid nitrogen into the cryogenic treatment tank 6; monitoring the temperature in the cryogenic treatment tank 6 in real time by a temperature sensor 8 in the cryogenic treatment tank, setting the temperature threshold to be liquid nitrogen temperature-196 ℃, and continuously introducing liquid nitrogen before reaching the temperature threshold; after the temperature threshold is reached, closing the storage tank switch 2 and the pressure increasing valve controller 4, and keeping the temperature in the cryogenic treatment tank at the temperature threshold for 1-2 h;
s3, after the temperature in the deep cooling treatment box 6 is stable, setting parameters of a pulse current generator 16 and a pulse magnetic field generator 20, and turning on the pulse current generator 16 and the pulse magnetic field generator 20;
and S4, after the electromagnetic composite field treatment is finished, closing the pulse current generator 16 and the pulse magnetic field generator 20, closing a storage tank switch, taking out the metal material, and performing temperature rise treatment at room temperature until the room temperature.
Further optimization, the parameters of the pulse current generator 16 set according to different metal materials are as follows: the current is 0-500A, the pulse frequency is 50HZ, and the impact time is 0-2 s; the set parameters of the pulsed magnetic field generator include: the magnetic field intensity is 0-1T, and the electrifying time is 0-2 s.
Further optimization, the subzero treatment in the step S2 is started to be reduced from room temperature, the cooling speed is 5-10 ℃ 5555, and the phenomenon of hydrogen embrittlement and fracture of the 18 samples of the metal material sample caused by too fast temperature reduction is avoided.
Further optimization is carried out, the temperature rise speed in the step S4 is 5-10 ℃ 5555, and the phenomenon that the performance of the metal material sample 18 is influenced by recrystallization and the like is avoided.
Accordingly, the present invention provides an apparatus for applying the above method, as shown in fig. 1, the apparatus comprises a cryogenic treatment tank 6, a liquid nitrogen storage tank 1 disposed outside the cryogenic treatment tank 6, a pulsed current generator 16, a pulsed magnetic field generator 20, a computer system 17, and a sample holder 10 and a temperature sensor 8 disposed outside the cryogenic treatment tank 6. The liquid nitrogen storage tank 1 is communicated with the cryogenic treatment tank 6 through a liquid nitrogen conduit 3, and a storage tank switch 2, a booster valve controller 4 and a flow control valve 5 are arranged on the liquid nitrogen conduit 3. A metal material sample 18 to be processed is installed on the sample clamp 10, an excitation coil 19 is wound on the periphery of the metal material sample 18, the excitation coil 19 is not in direct contact with the metal material sample 18, the metal material sample 18 is connected with a pulse current generator 16, and the excitation coil 19 is connected with a pulse magnetic field generator 20. The temperature sensor 8, the booster valve controller 4 and the flow control valve 5 are respectively connected with a computer system 17 to realize data transmission and automatic control of the device.
Further preferably, the sample clamp 10 comprises two U-shaped clamping grooves which are oppositely arranged, and two ends of the metal material are respectively arranged in the U-shaped clamping grooves and are fixed through the first bolt 9; the two U-shaped clamping grooves are respectively connected with the positive electrode and the negative electrode of the pulse current generator 16 so as to conduct current to the metal material; the distance between the two U-shaped clamping grooves can be adjusted to adapt to metal materials with different sizes.
Further optimizing, two metal guide rails 12 are arranged in the cryogenic treatment tank 6 at intervals, a metal sliding block 11 is arranged on each of the two metal guide rails 12, the two metal sliding blocks 11 are connected with the two U-shaped clamping grooves through metal supports respectively, the metal sliding blocks 11 can move on the metal guide rails 12 to adjust the distance between the two U-shaped clamping grooves, and the metal sliding blocks 11 are fixed on the metal guide rails 12 through second bolts 15 after the distance is adjusted; the bottom parts of the two metal guide rails 12 are respectively provided with a conductive block 13, and the two metal slide blocks 11 are respectively connected with the positive electrode and the negative electrode of a pulse current generator 16 through leads 14.
Further preferably, the metal guide rail 12 and the conductive block 13 are separated from the junction of the cryogenic treatment tank 6 by insulating materials.
Further optimize, cryrogenic treatment box 6 is made by the metal, and the surface sets up insulating layer 7 and makes the thermal-insulated effect of heat preservation better. Specifically, the heat insulation layer 7 is a layer of heat insulation metal material film coated on the surface of the metal box body.
Further optimization, the interface of the cryogenic treatment tank 6 connected with other components is sealed by sealant to prevent heat transfer.
According to the invention, the metal material is subjected to strengthening treatment by adopting the electromagnetic composite field in the cryogenic environment, the electric field and the magnetic field are coupled in the cryogenic environment, the stacking fault energy of the metal material is reduced in the cryogenic environment, high-density twin crystals are generated in the metal material, and the ductility of the metal material is improved. The metal material generates vibration in a dynamic magnetic field to form plastic deformation, and when pulse current is applied in the deformation process, the rheological stress is greatly reduced due to the electro-plastic effect, so that the diffusion of atoms and the slippage of crystal boundaries are facilitated, and the redistribution and the structural change of dislocation are caused. The coupling of the electric field and the magnetic field can effectively improve the strength of the metal material, and twin crystals generated by the cryogenic treatment are beneficial to improving the ductility of the metal material, so that the electromagnetic composite field is carried out in the cryogenic environment to treat the metal material, and the aim of improving the toughness of the metal material can be achieved.
In order to verify the effectiveness of the method of the invention in improving the toughness of metal materials, the following tests were carried out:
test 1: the high-entropy alloy is treated by the normal-temperature electromagnetic compound field for 0.5s.
A5055X 555X 155 high-entropy alloy metal material sample 18 is placed on a sample clamp 10, and the metal material sample is placed on a metal material testAn excitation coil 19 is wound on the periphery of the sample 18, parameters of a pulse current generator 16 are set, the pulse current is 500A, the frequency is 50Hz, the electrifying time is 0.5s, and the current density is 100A555 according to the cross section area of the metal material sample 18 and the current size 2 Setting parameters of a pulse magnetic field generator 20, enabling the magnetic field intensity B =0.5T and the electrifying time to be 0.5s, turning on the pulse current generator 16 and the pulse magnetic field generator 20, and carrying out normal-temperature electromagnetic composite field treatment on the metal material sample 18. And after the electromagnetic composite field treatment is finished, the pulse current generator 16 and the pulse magnetic field generator 20 are closed, and the metal material sample 18 is taken out.
A corresponding detection instrument can see that a small amount of twin crystals exist in the material, the yield strength of the material is 600MPa, and the elongation is 20%.
Test 2: and processing the high-entropy alloy for 1s by using a normal-temperature electromagnetic compound field.
Placing a 5055 multiplied by 555 multiplied by 155 high-entropy alloy metal material sample 18 on a sample clamp 10, winding an excitation coil 19 on the periphery of the metal material sample 18, setting parameters of a pulse current generator 16, calculating according to the metal material sample 18 and the current, wherein the pulse current is 500A, the frequency is 50Hz, the electrifying time is 1s, and the current density is 100A555 2 Setting parameters of a pulse magnetic field generator 20, enabling the magnetic field intensity B =0.5T and the electrifying time to be 1s, turning on a pulse current generator 16 and the pulse magnetic field generator 20, and carrying out normal-temperature electromagnetic composite field treatment on the metal material sample 18. And after the electromagnetic composite field treatment is finished, the pulse current generator 16 and the pulse magnetic field generator 20 are closed, and the metal material sample 18 is taken out.
A corresponding detection instrument can see that a small amount of twin crystals exist in the material, the yield strength of the material is 680MPa, and the elongation is 23%.
Test 3: the high-entropy alloy is processed for 0.5s by the cryogenic electromagnetic composite field.
Placing a 5055X 555X 155 high-entropy alloy metal material sample 18 on a sample clamp 10, winding an excitation coil 19 on the periphery of the metal material sample 18, opening a storage tank switch 2, opening a pressure increasing valve controller 4, opening a computer system 17, and detecting the temperature of the metal material sample according to the temperature of a temperature sensor 8Real-time feedback, real-time recording the temperature in the subzero treatment box 6, setting a temperature threshold value of-196 ℃, automatically controlling the booster valve controller 4 to convey liquid nitrogen before the temperature reaches the temperature threshold value of-196 ℃, adjusting the liquid nitrogen flow control valve 5 to reduce the temperature in the subzero treatment box at a rate of 5-10 ℃ 5555, closing the storage tank switch 2 and the booster valve controller 4 after the temperature reaches the temperature threshold value, and keeping the temperature of the subzero treatment box 6 at-196 ℃ for 1h. While the cryogenic treatment box 6 is kept warm, the parameters of a pulse current generator 16 are set, the pulse current is 500A, the frequency is 50Hz, the electrifying time is 0.5s, and the current density is 100A555 according to the metal material sample 18 and the current magnitude 2 The parameters of the pulse magnetic field generator 20 are set, the magnetic field intensity B =0.5T, the electrifying time is 0.5s, the pulse current generator 16 and the pulse magnetic field generator 20 are turned on, and the cryogenic electromagnetic composite field treatment is carried out on the metal material sample 18. After the electromagnetic composite field treatment is finished, the pulse current generator 16 and the pulse magnetic field generator 20 are closed, the storage tank switch 2 is closed, the booster valve controller 4 is closed, the computer system 17 is closed, the metal material sample 18 is taken out, and the temperature is raised in the room temperature environment until the room temperature is reached.
A corresponding detection instrument can see that a large number of twin crystals exist in the material, the yield strength of the material is 710MPa, and the elongation is 28%.
Test 4: and treating the high-entropy alloy for 1s by using a cryogenic electromagnetic composite field.
Placing a 5055 multiplied by 555 multiplied by 155 high-entropy alloy metal material sample 18 on a sample clamp 10, winding an excitation coil 19 on the periphery of the metal material sample 18, opening a storage tank switch 2, opening a booster valve controller 4, opening a computer system 17, recording the temperature in a cryogenic treatment tank 6 in real time according to real-time feedback of a temperature sensor 8, setting a temperature threshold value of-196 ℃, automatically controlling the booster valve controller 4 to convey liquid nitrogen before the temperature threshold value reaches-196 ℃, adjusting a liquid nitrogen flow control valve 5 to reduce the temperature in the cryogenic treatment tank 6 at a rate of 5-10 ℃ 5555, closing the storage tank switch 2 and the booster valve controller 4 after the temperature threshold value is reached, and keeping the temperature of the cryogenic treatment tank 6 at-196 ℃ for 1h. While the cryogenic treatment box 6 is kept warm, the parameters of the pulse current generator 16 are setThe pulse current is 500A, the frequency is 50Hz, the electrifying time is 1s, and the current density is 100A555 according to the metal material sample 18 and the current magnitude 2 Setting parameters of a pulse magnetic field generator 20, enabling the magnetic field intensity B =0.5T and the electrifying time to be 1s, turning on a pulse current generator 16 and the pulse magnetic field generator 20, and carrying out cryogenic electromagnetic composite field treatment on the metal material sample 18. After the electromagnetic composite field treatment is finished, the pulse current generator 16 and the pulse magnetic field generator 20 are closed, the storage tank switch 2 is closed, the booster valve controller 4 is closed, the computer system 17 is closed, the metal material sample 18 is taken out, and the temperature is raised in the room temperature environment until the room temperature is reached.
A corresponding detection instrument can see that a large number of twin crystals exist in the material, the yield strength of the material is 742MPa, and the elongation is 31%.
In the tests 1 to 4, the yield strength and the elongation of the material after being treated in the room temperature environment and the cryogenic electromagnetic composite field are respectively shown in fig. 2 and fig. 3, and it can be seen that compared with an untreated sample, the yield strength of the sample after being treated in the room temperature environment is improved from 500MPa to 680MPa, and the elongation is improved from 15% to 23%; the yield strength of the sample treated by the electromagnetic composite field in the cryogenic environment is improved from 500MPa to 742MPa, and the elongation is improved from 15% to 31%. The electromagnetic composite field treatment in the room temperature environment improves the toughness of the sample to a certain extent, but under the same electromagnetic composite field parameters, compared with the room temperature environment, the yield strength and the elongation of the cryogenic electromagnetic composite field treatment material are greatly improved, which shows that the electromagnetic composite field treatment in the cryogenic environment can effectively improve the toughness of the metal material and strengthen the performance of the metal material.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for improving the obdurability of a metal material by utilizing a cryogenic electromagnetic composite field is characterized by comprising the following steps of:
s1, mounting a metal material on a sample clamp in a cryogenic treatment box, winding an excitation coil on the periphery of the metal material, and enabling the excitation coil not to be in contact with the metal material; communicating the cryogenic treatment tank with a liquid nitrogen storage tank, and connecting the metal material with a pulse current generator; connecting the excitation coil with a pulse magnetic field generator;
s2, opening a switch of a liquid nitrogen storage tank, and conveying liquid nitrogen into the cryogenic treatment tank; monitoring the temperature in the cryogenic treatment tank in real time by a temperature sensor in the cryogenic treatment tank, setting the temperature threshold to be liquid nitrogen temperature-196 ℃, and continuously introducing liquid nitrogen before reaching the temperature threshold; after the temperature threshold is reached, closing a switch of the liquid nitrogen storage tank and a pressure increasing valve controller, and keeping the temperature in the cryogenic treatment tank at the temperature threshold for 1-2 hours;
s3, after the temperature in the cryogenic treatment box is stable, setting parameters of a pulse current generator and a pulse magnetic field generator, and turning on the pulse current generator and the pulse magnetic field generator;
and S4, after the electromagnetic composite field treatment is finished, closing the pulse current generator and the pulse magnetic field generator, closing a switch of the liquid nitrogen storage tank, taking out the metal material, and performing temperature rise treatment at room temperature until the room temperature.
2. The method for improving the toughness of the metal material by using the cryogenic electromagnetic composite field according to claim 1, wherein the set parameters of the pulse current generator comprise: the current is 0-500A, the pulse frequency is 50HZ, and the impact time is 0-2 s; the set parameters of the pulsed magnetic field generator include: the magnetic field intensity is 0-1T, and the energizing time is 0-2 s.
3. The method for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 1, wherein the cryogenic treatment in the step S2 is started to be reduced from room temperature, and the cooling speed is 5-10 ℃ 5555.
4. The method for improving the toughness of a metal material by using the cryogenic electromagnetic composite field according to claim 1, wherein the temperature rise rate in the step S4 is 5 to 10 ℃ 5555.
5. A device for improving the toughness of a metal material by using a cryogenic electromagnetic composite field is characterized by being used for realizing the method for improving the toughness of the metal material by using the cryogenic electromagnetic composite field according to any one of claims 1 to 4, wherein the device comprises a cryogenic treatment box, a liquid nitrogen storage tank, a pulse current generator, a pulse magnetic field generator and a computer system which are arranged outside the cryogenic treatment box, and a sample clamp and a temperature sensor which are arranged outside the cryogenic treatment box; the liquid nitrogen storage tank is communicated with the cryogenic treatment tank through a liquid nitrogen guide pipe, and a storage tank switch, a booster valve controller and a flow control valve are arranged on the liquid nitrogen guide pipe; the metal material to be processed is arranged on the sample clamp, an excitation coil is wound on the periphery of the metal material and is not in contact with the metal material, the metal material is connected with a pulse current generator, and the excitation coil is connected with a pulse magnetic field generator; and the temperature sensor, the pressure increasing valve controller and the flow control valve are respectively connected with a computer system.
6. The device for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 5, wherein the sample clamp comprises two U-shaped clamping grooves which are oppositely arranged, and two ends of the metal material are respectively arranged inside the U-shaped clamping grooves and are fixed by a first bolt; the two U-shaped clamping grooves are respectively connected with the positive electrode and the negative electrode of the pulse current generator so as to conduct current to the metal material; the distance between the two U-shaped clamping grooves can be adjusted to adapt to metal materials with different sizes.
7. The device for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 6, wherein two metal guide rails are arranged in the cryogenic treatment tank at intervals, a metal slide block is arranged on each of the two metal guide rails, the two metal slide blocks are respectively connected with the two U-shaped clamping grooves through metal supports, and the metal slide blocks can move on the metal guide rails so as to adjust the distance between the two U-shaped clamping grooves; the bottoms of the two metal guide rails are respectively provided with a conductive block, and the two metal sliding blocks are respectively connected with the positive electrode and the negative electrode of the pulse current generator through leads.
8. The device for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 5, wherein a heat insulation layer is arranged on the outer surface of the cryogenic treatment tank.
9. The device for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 8, wherein the heat insulation layer is a heat insulation metal material film coated on the outer surface of the cryogenic treatment tank.
10. The device for improving the toughness of the metal material by utilizing the cryogenic electromagnetic composite field according to claim 5, wherein the interface of the cryogenic treatment tank and other components is sealed by a sealant to prevent heat transfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210974705.8A CN115354126A (en) | 2022-08-15 | 2022-08-15 | Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210974705.8A CN115354126A (en) | 2022-08-15 | 2022-08-15 | Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115354126A true CN115354126A (en) | 2022-11-18 |
Family
ID=84000952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210974705.8A Pending CN115354126A (en) | 2022-08-15 | 2022-08-15 | Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115354126A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963533A (en) * | 1974-12-23 | 1976-06-15 | General Motors Corporation | Low temperature magnetic treatment of ferromagnetic materials |
| CN106199348A (en) * | 2016-06-21 | 2016-12-07 | 天津大学 | Electromagnetic field jointly act under low temperature polymer electric branch initiating method and device |
| CN106498322A (en) * | 2016-09-21 | 2017-03-15 | 江苏大学 | A kind of magnetostatic field cryogenic treating process for improving copper or copper alloy obdurability |
| CN109825677A (en) * | 2019-04-04 | 2019-05-31 | 四川大学 | Electromagnetic coupling material handling device |
| CN111235458A (en) * | 2020-02-28 | 2020-06-05 | 江苏大学 | Boron-containing rare earth-containing high-entropy alloy and magnetic field treatment method thereof |
| CN111575613A (en) * | 2020-05-08 | 2020-08-25 | 中南大学 | Cryogenic electric pulse treatment method for removing residual stress of ultra-fine grain aluminum-lithium alloy thin strip |
| CN111705186A (en) * | 2020-06-11 | 2020-09-25 | 清华大学 | Method for reducing retained austenite of high alloy steel |
| CN112029962A (en) * | 2020-09-03 | 2020-12-04 | 四川大学 | Bipolar electrode-twin coil pulse electromagnetic coupling strengthens metallic material device |
-
2022
- 2022-08-15 CN CN202210974705.8A patent/CN115354126A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963533A (en) * | 1974-12-23 | 1976-06-15 | General Motors Corporation | Low temperature magnetic treatment of ferromagnetic materials |
| CN106199348A (en) * | 2016-06-21 | 2016-12-07 | 天津大学 | Electromagnetic field jointly act under low temperature polymer electric branch initiating method and device |
| CN106498322A (en) * | 2016-09-21 | 2017-03-15 | 江苏大学 | A kind of magnetostatic field cryogenic treating process for improving copper or copper alloy obdurability |
| CN109825677A (en) * | 2019-04-04 | 2019-05-31 | 四川大学 | Electromagnetic coupling material handling device |
| CN111235458A (en) * | 2020-02-28 | 2020-06-05 | 江苏大学 | Boron-containing rare earth-containing high-entropy alloy and magnetic field treatment method thereof |
| CN111575613A (en) * | 2020-05-08 | 2020-08-25 | 中南大学 | Cryogenic electric pulse treatment method for removing residual stress of ultra-fine grain aluminum-lithium alloy thin strip |
| CN111705186A (en) * | 2020-06-11 | 2020-09-25 | 清华大学 | Method for reducing retained austenite of high alloy steel |
| CN112029962A (en) * | 2020-09-03 | 2020-12-04 | 四川大学 | Bipolar electrode-twin coil pulse electromagnetic coupling strengthens metallic material device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110449541B (en) | GH4169 high-temperature alloy free forged bar blank and preparation method thereof | |
| CN109825689B (en) | Method for preparing high-solid-solubility ultra-fine grain high-speed steel by using electric pulse | |
| CN101181718B (en) | Method for producing wide strip steel by bar strip continuous casting and rolling as well as system therefor | |
| CN101413049B (en) | Preparation of normalizing weldable fine grain steel plate with a yield strength of 420MPa | |
| CN110788134B (en) | Warm rolling-ultralow temperature cold rolling production process for magnesium alloy ultrathin plate | |
| US4065329A (en) | Continuous heat treatment of cold rolled steel strip | |
| CN111485095A (en) | Control method for promoting homogenization treatment of continuous casting slab | |
| CN101319270B (en) | Thermal treatment method for improving mechanical performances of normalized steel plate | |
| CN105177259A (en) | Method for rapidly promoting deformation to induce martensite transformation | |
| CN106676392A (en) | Hot-dip galvanized plate and production method thereof | |
| CN105986092A (en) | Subzero treatment process | |
| CN115354126A (en) | Method and device for improving toughness of metal material by using cryogenic electromagnetic composite field | |
| CN1172018C (en) | In-line destresing process and apparatus for Cu-alloy pipe or wire | |
| CN103320686B (en) | Cold rolled sheet No. 45 steel and production method thereof | |
| CN103233113A (en) | Heat treatment process of welded type weighted drill rod joint | |
| CN111089119B (en) | Device and process for reinforcing inner raceway of bearing outer ring by pulse current assistance | |
| CN110229947B (en) | Axle tube well type furnace quenching method | |
| CN104630614B (en) | Method for improving forming performance of super-low-carbon aluminum killed steel galvanized product | |
| CN109825688B (en) | Hot working process for P20 and 718 plastic die steel | |
| CN100344406C (en) | Manufacturing method for high strength bailing band | |
| CN108425002B (en) | A kind of preparation method of 12Cr2Mo1 hot rolling tank plate | |
| CN110923428A (en) | Heat treatment method for metal sample | |
| CN111041178B (en) | Preparation method of high-strength high-toughness double-phase steel by circulating rolling | |
| JP2984869B2 (en) | Manufacturing method of high quality cold rolled steel sheet by material control | |
| CN113265602A (en) | Heat treatment method for rapidly improving strength of aluminum alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |