CN115216599A - Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal - Google Patents
Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal Download PDFInfo
- Publication number
- CN115216599A CN115216599A CN202210788759.5A CN202210788759A CN115216599A CN 115216599 A CN115216599 A CN 115216599A CN 202210788759 A CN202210788759 A CN 202210788759A CN 115216599 A CN115216599 A CN 115216599A
- Authority
- CN
- China
- Prior art keywords
- surface layer
- induction heating
- nano
- thickness
- workpiece
- 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
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to an induction heating device and method for controlling the thickness of a coarse grain structure on a nano metal surface layer. Aiming at the defect that the plasticity, the chemical stability and the thermodynamic stability of the metal material with the nano structure are relatively poor, the method utilizes the controlled ultrahigh frequency electromagnetic induction heating and synchronous cooling technology to realize the recrystallization annealing heat treatment of the metal surface layer tissue with the rod-shaped nano structure, thereby forming the gradient nano structure with the coarse crystal surface layer gradually transited to the nano crystal core part. The gradient nanostructure keeps the high-strength chemical property of the nanocrystal and realizes the matching of the high strength of the nanocrystal and the high plasticity, high chemical and thermodynamic stability of the crude crystal.
Description
Technical Field
The invention relates to the technical field of surface treatment of nano metal materials, in particular to an induction heating device and method for controlling the thickness of a coarse grain structure on the surface layer of nano metal.
Background
Increasing the strength of metallic materials is one of the directions in which materials scientists continue to strive. Along with the continuous improvement of the strength of the metal material, the plastic deformation capacity of the material is gradually reduced, and the engineering application value of the high-strength metal is obviously reduced. For example, according to Hall-Petch theory, reducing the grain size of the metal to nanometer scale can improve the yield strength by 5 to 10 times, but the tensile elongation is generally less than 2%, and the engineering brittleness characteristic is shown. Although there are various methods to prepare nanostructured metals, large-sized bulk nanostructured metals are mainly obtained by severe plastic deformation methods. In the severe plastic deformation preparation process, regions such as the inside of crystal grains, crystal boundaries and the like show lower thermodynamic and chemical stability due to higher distortion energy and disorder degree, so that the practical application of the nano-structure metal in high-temperature environments, chemical environments and biological tissue environments is limited.
In the prior patents, a gradient nanostructure having excellent comprehensive high-cycle and low-cycle fatigue properties, a method for preparing a gradient nanostructure metal material using an ultra-precision processing technique, and the like, a nanostructure surface layer is formed on a surface of a coarse-grained metal by severe plastic deformation, instead of a coarse-grained surface layer formed on a surface of a nanostructure metal. In a method for preparing a metal material with a reverse gradient nanostructure, an asymmetric rolling technology is utilized to lead the tissue refinement degree of the surface layer and the core part of a sheet sample to be different, thereby showing the structure of large crystal grains on the surface layer and small crystal grains on the core part, but the large crystal grains on the surface layer are not coarse crystals in a thermodynamically stable state in the traditional sense. At present, no mature technical scheme exists for the formation of the surface layer coarse crystal structure of the nano-structure metal. The coarse crystal structure is formed on the surface of the metal with the nano structure, and the surface of the material is essentially subjected to heat treatment, so that the surface structure is recovered to the coarse crystal structure to a certain extent through recovery and recrystallization. However, like ordinary metals, nanometals have material characteristics with good thermal conductivity. To meet the technical requirement that the surface structure is recovered and the core structure is not changed, the surface of the material needs to be rapidly heated in a short time, so that the surface temperature is rapidly increased to be higher than the recrystallization temperature, and the recrystallization process of the surface nano structure is completed before the temperature of the core is not increased due to heat transfer. This processIt is required to form a temperature gradient of several hundred degrees centigrade per millimeter in the surface layer of the sample, and the higher the temperature gradient, the more favorable the tissue recovery of the surface layer without damaging the nano-tissue of the core. However, the higher the temperature gradient, the recrystallization nucleation and growth of the surface nano-structure are completed within millisecond time scale, and the degree of recovery of the surface structure is extremely difficult to control, thereby causing the situation that some surface parts are insufficiently recovered or transited. In addition, the high resistivity of nanometals leads to higher joule heating effects, i.e. Q = I 2 R, the higher the resistance and the higher the heat, and the ultrahigh frequency induction heating just utilizes the characteristic of the nano metal material.
For the nano-structure metal obtained by a severe plastic deformation method, the electron scattering is intensified and the resistivity is high due to the existence of higher-density dislocation, sub-grain boundary, disordered atomic region and the like. Therefore, the invention utilizes the characteristic that nano metal has high resistivity so as to bring higher Joule heat effect, designs a heating-cooling-temperature measurement integrated heat treatment device based on an ultrahigh frequency high-power electromagnetic induction heating technology, provides a correlation method between grain size control and processing parameters such as rotating speed, translation speed, heating power and the like, and realizes accurate control of millisecond-level heating and cooling by means of a computer closed-loop control technology, thereby realizing the recovery of surface tissues as required. In addition, the invention can process different parts of the revolving body sample and the component according to actual requirements, and meets the special requirements of different parts of surface layer tissues to be restored to different degrees.
Disclosure of Invention
The purpose of the invention is as follows:
through proper organization treatment, the surface layer of the nano-structure metal is recovered to the coarse-grained structure of the traditional metal to a certain extent, so that the plasticity, the thermodynamics and the chemical stability of the surface layer are improved. In short, the outer layer has a coarse crystal structure with a certain thickness, and the inner fine crystal structure ensures the strength. In addition, a grain size gradient structure is formed between the surface layer of the coarse crystal and the core structure of the nano structure, more geometrically necessary dislocations can be stored through the deformation coordination between the coarse crystal structure and the nano crystal structure, and the plastic deformation capacity is further improved.
The outer layer of the nano metal has a coarse-grain structure with a certain thickness, and meanwhile, the thickness can be controlled, and the strength of the fine-grain structure inside is ensured. More preferably, a grain size gradient structure is formed between the surface layer of the coarse crystals and the core structure of the nanostructures.
The technical scheme is as follows:
providing an induction heating device for controlling the thickness of the coarse grain structure on the metal surface layer of the nano structure, wherein the induction heating device comprises a coil 1, a U-shaped magnetizer 2, an upper temperature measuring optical fiber 4, a middle temperature measuring optical fiber 5 and a cooling medium spray pipe 6;
the coil 1 is wound at the U-shaped bottom of the magnetizer;
the upper temperature measuring optical fiber 4 is positioned on one side of the U-shaped magnetizer, and the middle temperature measuring optical fiber 5 is positioned between the two arms of the U-shaped magnetizer; the cooling medium spray pipe 6 is positioned on the other side of the U-shaped magnetizer; the upper temperature measuring optical fiber 4 is the front end, and the cooling medium spray pipe 6 is the rear end;
the induction heating device forms an alternating magnetic field and conducts the alternating magnetic field to the surface of the workpiece through a composite material soft magnet (magnetizer); the magnetizer forms induced current on the surface of the workpiece, and the induced current tends to be distributed on the surface layer of the workpiece due to skin effect; the induced current generates heat on the surface layer through joule effect, and the surface layer of the workpiece is rapidly heated.
The technical scheme of the invention utilizes the convergence effect of the magnetizer to focus the magnetic field induced by the induction coil in the gap between the surface layer of the workpiece and the magnetizer, thereby obviously improving the induction efficiency. The rotation does not affect the efficiency of induction heating, but only the time for local heating. Metals have a high thermal conductivity and must be fast enough to prevent heat transfer to the interior.
Two temperature measuring optical fibers are arranged at the upper end and the middle opening of the magnetizer, and a cooling medium nozzle is designed at the lower end. In the working process, the temperature of the surface layer of the workpiece is detected by the upper temperature measuring optical fiber before entering the heat treatment device, the heating temperature of the surface layer is monitored by the middle temperature measuring optical fiber, and the surface layer leaving the heating area is rapidly cooled by the lower cooling medium nozzle. The device is matched with the PID control of a computer, middle-path temperature measurement optical fiber data is used as a feedback signal, and the gap size between the magnetizer and the surface of the workpiece is adjusted in a closed loop mode, so that the constant-temperature instantaneous heating of the surface layer of the workpiece is realized.
The workpiece rotation in the invention does not affect the induction heating efficiency, and only affects the local heating time. In the technical scheme, only the surface is subjected to induction heating, the heat is not conducted to the depth direction, the tissue change caused by the internal heating of the material is prevented, only the coarse crystal tissue is formed on the surface of the nano material, the internal part is still the fine crystal tissue, and the coarse crystal tissue and the fine crystal tissue are not in transition change and are in gradient change.
The method for controlling the thickness of the coarse grain structure on the surface layer of the nano-structure metal based on the induction heating device utilizes the induction heating device to control the thickness of the coarse grain structure on the surface layer of the nano-structure metal; the thickness generation is controlled by controlling the induction heating parameters, and the relation between the thickness p of the surface layer coarse-grained structure formed by the nano-structure metal and the induction heating parameters is as follows:
the recrystallization temperature of the nanostructured metal is T RX Electromagnetic induction frequency f, width H of the open end of the U-shaped magnetizer, relative dielectric permeability μ of the workpiece, electrical conductivity σ of the workpiece, diameter D of the revolving structure of the workpiece, angular velocity ω of the revolving structure of the workpiece, temperature at the skin depth T, and thermal conductivity k of the nano-structure metal material t Density of nano-structured metal material ρ and heat capacity of nano-structured metal material c p 。
Further, the electromagnetic induction heating frequency of the induction heating device is between 200 and 500 kHz.
Further, the diameter of the workpiece to be rotated is usually 10mm to 100 mm.
Further, the nanostructured metal is obtained by severe plastic deformation process. Preferably by repeated hammering or equal channel angular pressing.
The technical effects are as follows:
the surface layer of the metal with the nano structure is recovered to the coarse-grained structure of the traditional metal to a certain extent through proper organization treatment, so that the plasticity, the thermodynamics and the chemical stability of the surface layer are improved. Not only the outer layer is ensured to have a coarse-grained structure with a certain thickness, but also the inner fine-grained structure is ensured to have strength. In addition, a grain size gradient structure is formed between the surface layer of the coarse crystal and the core structure of the nano structure, more geometrically necessary dislocations can be stored through the deformation coordination between the coarse crystal structure and the nano crystal structure, and the plastic deformation capacity is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 is a schematic structural view of an induction heating apparatus according to the present invention;
fig. 2 is a schematic diagram of the present invention for sensing direction.
In the figure: 1. the device comprises a coil, 2 parts of a soft magnet, 3 parts of a workpiece, 4 parts of an upper temperature measuring optical fiber, 5 parts of a middle temperature measuring optical fiber, 6 parts of a cooling medium spray pipe.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.
Providing an induction heating device for controlling the thickness of the coarse grain structure on the metal surface layer of the nano structure, wherein the induction heating device comprises a coil 1, a U-shaped magnetizer 2, an upper temperature measuring optical fiber 4, a middle temperature measuring optical fiber 5 and a cooling medium spray pipe 6;
the coil 1 is wound at the U-shaped bottom of the magnetizer;
the upper temperature measuring optical fiber 4 is positioned on one side of the U-shaped magnetizer, and the middle temperature measuring optical fiber 5 is positioned between the two arms of the U-shaped magnetizer; the cooling medium spray pipe 6 is positioned on the other side of the U-shaped magnetizer; the upper temperature measuring optical fiber 4 is the front end, and the cooling medium spray pipe 6 is the rear end;
the induction heating device forms an alternating magnetic field and conducts the alternating magnetic field to the surface of the workpiece through the composite material soft magnet (magnetizer); the magnetizer forms induced current on the surface of the workpiece, and the induced current tends to be distributed on the surface layer of the workpiece due to skin effect; the induced current generates heat on the surface layer through joule effect, and the surface layer of the workpiece is rapidly heated.
According to the technical scheme, the convergence effect of the magnetizer is utilized, so that the magnetic field induced by the induction coil is focused in the gap between the surface layer of the workpiece and the magnetizer, and the induction efficiency is obviously improved. The rotation does not affect the efficiency of induction heating, but only the time for local heating. Metals have high thermal conductivity and must be fast enough to prevent heat transfer to the interior.
Two temperature measuring optical fibers are arranged at the upper end and the middle opening of the magnetizer, and a cooling medium nozzle is designed at the lower end. In the working process, the temperature of the surface layer of the workpiece is detected by the upper temperature measuring optical fiber before entering the heat treatment device, the heating temperature of the surface layer is monitored by the middle temperature measuring optical fiber, and the surface layer leaving the heating area is rapidly cooled by the lower cooling medium nozzle. The device is matched with the PID control of a computer, middle-path temperature measurement optical fiber data is used as a feedback signal, and the gap size between the magnetizer and the surface of the workpiece is adjusted in a closed loop mode, so that the constant-temperature instantaneous heating of the surface layer of the workpiece is realized.
The workpiece rotation in the invention does not affect the induction heating efficiency, and only affects the local heating time. In the technical scheme, only the surface is subjected to induction heating, the heat is not conducted to the depth direction, the tissue change caused by the internal heating of the material is prevented, only the coarse crystal tissue is formed on the surface of the nano material, the internal part is still the fine crystal tissue, and the coarse crystal tissue and the fine crystal tissue are not in transition change and are in gradient change.
The method for controlling the thickness of the coarse grain structure on the surface layer of the nano-structure metal based on the induction heating device utilizes the induction heating device to control the thickness of the coarse grain structure on the surface layer of the nano-structure metal; the thickness generation is controlled by controlling the induction heating parameters, and the relation between the thickness p of the surface layer coarse-grained structure formed by the nano-structure metal and the induction heating parameters is as follows:
the recrystallization temperature of the nanostructured metal is T RX Electromagnetic induction frequency f, width H of the open end of the U-shaped magnetizer, relative dielectric permeability μ of the workpiece, electrical conductivity σ of the workpiece, diameter D of the revolving structure of the workpiece, angular velocity ω of the revolving structure of the workpiece, temperature at the skin depth T, and thermal conductivity k of the nano-structure metal material t Density of nano-structured metal material ρ and heat capacity of nano-structured metal material c p 。
The electromagnetic induction heating frequency of the induction heating device is between 200 and 500 kHz.
The diameter of the workpiece in the revolving body is usually between 10mm and 100 mm.
The nanostructured metal is obtained by a severe plastic deformation process. Preferably by repeated hammering or equal channel angular pressing.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (8)
1. The induction heating device for controlling the thickness of the coarse grain structure on the surface layer of the metal with the nano structure is characterized in that: the induction heating device comprises a coil (1), a U-shaped magnetizer (2), an upper temperature measuring optical fiber (4), a middle temperature measuring optical fiber (5) and a cooling medium spray pipe (6);
the coil (1) is wound at the U-shaped bottom of the magnetizer;
the upper temperature measuring optical fiber (4) is positioned on one side of the U-shaped magnetizer, and the middle temperature measuring optical fiber (5) is positioned between the two arms of the U-shaped magnetizer; the cooling medium spray pipe (6) is positioned on the other side of the U-shaped magnetizer; the upper temperature measuring optical fiber (4) is the front end, and the cooling medium spray pipe (6) is the rear end;
the induction heating device forms an alternating magnetic field and conducts the current to the surface of the workpiece through the U-shaped magnetizer; the magnetizer forms induced current on the surface of the workpiece, and the induced current tends to be distributed on the surface layer of the workpiece due to skin effect; the induced current generates heat on the surface layer through joule effect, and the surface layer of the workpiece is rapidly heated.
2. The induction heating device for controlling the thickness of the coarse grain structure on the surface layer of the nano-structured metal according to claim 1, wherein: the U-shaped magnetizer is a composite material soft magnet.
3. The method for controlling the thickness of the coarse grain structure of the surface layer of the nano-structured metal by the induction heating device of claim 1 or 2, wherein the thickness of the coarse grain structure of the surface layer of the nano-structured metal is controlled by the induction heating device; the thickness generation is controlled by controlling the induction heating parameters, and the relation between the thickness p of the surface layer coarse-grained structure formed by the nano-structure metal and the induction heating parameters is as follows:
the recrystallization temperature of the nanostructured metal is T RX Electromagnetic induction frequency f, width H of the open end of the U-shaped magnetizer, relative dielectric permeability μ of the workpiece, electrical conductivity σ of the workpiece, diameter D of the revolving structure of the workpiece, angular velocity ω of the revolving structure of the workpiece, skin depthIs T, the thermal conductivity k of the nanostructured metal material t Density of nano-structured metal material ρ and heat capacity of nano-structured metal material c p 。
4. The method for controlling the thickness of the coarse grain structure on the surface of the nanostructured metal according to claim 3, wherein: the electromagnetic induction heating frequency of the induction heating device is between 200 and 500 kHz.
5. The method for controlling the thickness of the coarse grain structure on the surface of the nano-structured metal according to claim 3, wherein: the diameter of the workpiece in the form of a solid of revolution is usually between 10mm and 100 mm.
6. The method for controlling the thickness of the coarse grain structure on the surface of the nanostructured metal according to claim 3, wherein: the nanostructured metal is obtained by a severe plastic deformation process.
7. The method for controlling the thickness of the coarse grain structure on the surface of the nanostructured metal according to claim 6, wherein: the nanostructured metal is obtained by equal channel angular extrusion.
8. The method for controlling the thickness of the coarse grain structure on the surface of the nanostructured metal according to claim 6, wherein: the nanostructured metal is obtained by repeated forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210788759.5A CN115216599A (en) | 2022-07-06 | 2022-07-06 | Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210788759.5A CN115216599A (en) | 2022-07-06 | 2022-07-06 | Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115216599A true CN115216599A (en) | 2022-10-21 |
Family
ID=83610031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210788759.5A Pending CN115216599A (en) | 2022-07-06 | 2022-07-06 | Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115216599A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000215971A (en) * | 1999-01-22 | 2000-08-04 | Canon Inc | Induction heating device and image forming device |
| JP2002270356A (en) * | 2001-03-09 | 2002-09-20 | Ricoh Co Ltd | Heating equipment, fixing equipment, and image forming equipment |
| CN1753580A (en) * | 2005-08-12 | 2006-03-29 | 天津大学 | Electromagnetic induction heating plate |
| CN202090027U (en) * | 2011-05-29 | 2011-12-28 | 内蒙古科技大学 | Horizontal induction heating device for medium plate |
| CN202502885U (en) * | 2012-03-05 | 2012-10-24 | 南京深宁磁电有限公司 | Nanocrystalline annular high-frequency transformer |
| CN109714847A (en) * | 2018-12-27 | 2019-05-03 | 江南大学 | Intermittent induction thermal reactor |
| CN110172655A (en) * | 2019-04-19 | 2019-08-27 | 武汉理工大学 | Nanocrystalline or Ultra-fine Grained graded metal material and preparation method inside the coarse-grain of surface layer |
| CN110193528A (en) * | 2019-06-10 | 2019-09-03 | 北京交通大学 | Gradient-heated and uniformly heated multifunctional DC induction heater structure can be achieved |
| CN112201429A (en) * | 2020-10-14 | 2021-01-08 | 燕山大学 | Permanent magnet with nanoscale gradient structure and preparation method thereof |
| CN213815704U (en) * | 2020-12-29 | 2021-07-27 | 南京邮电大学 | double-C-type variable air gap high-temperature superconducting direct-current induction heating device |
-
2022
- 2022-07-06 CN CN202210788759.5A patent/CN115216599A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000215971A (en) * | 1999-01-22 | 2000-08-04 | Canon Inc | Induction heating device and image forming device |
| JP2002270356A (en) * | 2001-03-09 | 2002-09-20 | Ricoh Co Ltd | Heating equipment, fixing equipment, and image forming equipment |
| CN1753580A (en) * | 2005-08-12 | 2006-03-29 | 天津大学 | Electromagnetic induction heating plate |
| CN202090027U (en) * | 2011-05-29 | 2011-12-28 | 内蒙古科技大学 | Horizontal induction heating device for medium plate |
| CN202502885U (en) * | 2012-03-05 | 2012-10-24 | 南京深宁磁电有限公司 | Nanocrystalline annular high-frequency transformer |
| CN109714847A (en) * | 2018-12-27 | 2019-05-03 | 江南大学 | Intermittent induction thermal reactor |
| CN110172655A (en) * | 2019-04-19 | 2019-08-27 | 武汉理工大学 | Nanocrystalline or Ultra-fine Grained graded metal material and preparation method inside the coarse-grain of surface layer |
| CN110193528A (en) * | 2019-06-10 | 2019-09-03 | 北京交通大学 | Gradient-heated and uniformly heated multifunctional DC induction heater structure can be achieved |
| CN112201429A (en) * | 2020-10-14 | 2021-01-08 | 燕山大学 | Permanent magnet with nanoscale gradient structure and preparation method thereof |
| CN213815704U (en) * | 2020-12-29 | 2021-07-27 | 南京邮电大学 | double-C-type variable air gap high-temperature superconducting direct-current induction heating device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xu et al. | Microstructure and mechanical properties of Ti–6Al–4V alloy fabricated using electron beam freeform fabrication | |
| CN105420484B (en) | A kind of nano-crystal soft magnetic alloy band pretreatment system and method | |
| CN110172655B (en) | Gradient metal material with nanocrystalline or ultrafine grain inside coarse grain of surface layer and preparation method thereof | |
| Xia et al. | A study of manufacturing tubes with nano/ultrafine grain structure by stagger spinning | |
| WO2018176870A1 (en) | Method for controlling integration of hot power spinning forming/performance of cylindrical part based on hot processing map | |
| Muñoz et al. | Ductility and plasticity of ferritic-pearlitic steel after severe plastic deformation | |
| Li et al. | Ordered phases and microhardness of Fe–6.5% Si steel sheet after hot rolling and annealing | |
| Wang et al. | Effect of heating rate on microstructure evolution and magnetic properties of cold rolled non-oriented electrical steel | |
| CN106756488B (en) | A kind of iron-based sub-nanometer magnetically soft alloy and preparation method thereof | |
| Furushima et al. | Effects of oxidation and surface roughening on drawing limit in dieless drawing process of SUS304 stainless steel microtubes | |
| Khan et al. | Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity | |
| CN106282508A (en) | A kind of heat treatment method preparing nanometer crystal alloy | |
| Li et al. | Effects of current-assisted heat treatment time on microstructure evolution and superplastic properties of Ti-22Al-24Nb-0.5 Mo alloy | |
| Yan et al. | Variant selection induced by electropulsing: Optimization in the microstructure of selective laser melted Ti-6Al-4 V alloy | |
| CN102643969A (en) | Ultra-high strength plastic low alloy steel with nano structure and preparation method thereof | |
| Wang et al. | A novel ultrasonic consolidation method for rapid preparation of diamond/Cu composites | |
| CN115216599A (en) | Induction heating device and method for controlling thickness of coarse grain structure on surface layer of nano metal | |
| Qi et al. | Effect of hydrogen on the microstructure and mechanical properties of high temperature deformation of Ti6Al4V additive manufactured | |
| Huang et al. | The effect of heat treatment on the anisotropy of Ti-6Al-4V by selective laser melting | |
| Rodionov et al. | Effect of recrystallization annealing on the formation of a perfect cube texture in FCC nickel alloys | |
| Kong et al. | Effects of constrained groove pressing and temperature-assisted ultrasonic shot peening on microstructure and mechanical properties of a two-phase Mg–Li alloy | |
| Zenker | Structure and properties as a result of electron beam surface treatment | |
| CN113943907B (en) | Preparation method of magnesium alloy plate strip with gradient heterogeneous structure | |
| Wang et al. | Microstructures, Thermal and Mechanical Properties of Pure Tungsten—A Comparison Between Selective Laser Melting and Hot Rolling | |
| Song et al. | Effects of Electric and Magnetic Treatments on Microstructures of Solid Metals: A Review |
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 |