CN113862664A - Method and device for pulse current composite energy field assisted laser cladding - Google Patents

Method and device for pulse current composite energy field assisted laser cladding Download PDF

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Publication number
CN113862664A
CN113862664A CN202111130752.6A CN202111130752A CN113862664A CN 113862664 A CN113862664 A CN 113862664A CN 202111130752 A CN202111130752 A CN 202111130752A CN 113862664 A CN113862664 A CN 113862664A
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laser
cladding
pulse current
laser cladding
energy field
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CN202111130752.6A
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王东生
高雪松
李�荣
彭丰
肖猛
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Anhui Zhongke Spring Valley Laser Industry Technology Research Institute Co Ltd
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Anhui Zhongke Spring Valley Laser Industry Technology Research Institute Co Ltd
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Publication of CN113862664A publication Critical patent/CN113862664A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention relates to the technical field of remanufacturing of ultrahigh-strength steel, in particular to a pulse current composite energy field auxiliary laser cladding method and a device. The device simultaneously applies an ultrasonic field and follow-up feeding pulse current in the laser cladding remanufacturing process of the ultrahigh-strength steel, so that a remanufacturing area is subjected to the synergistic effect of ultrasonic vibration and follow-up feeding pulse current, and the organizational structure in a cladding layer is regulated and controlled. The invention realizes the regulation and control of the ultrasonic vibration-follow-up feeding pulse current composite energy field on the structure performance of the laser cladding remanufacturing layer, can obtain the remanufacturing layer with uniform structure, low porosity, fine grain size and no crack, and is particularly suitable for the technical field of remanufacturing of ultrahigh-strength steel.

Description

Method and device for pulse current composite energy field assisted laser cladding
Technical Field
The invention relates to the technical field of remanufacturing of ultrahigh-strength steel, in particular to a method and a device for pulse current composite energy field auxiliary laser cladding.
Background
The ultra-high strength steel is widely used for manufacturing bearing structural members of aerospace, weapons, high-speed trains and other major demand occasions, such as aircraft landing gear, shafts, bolts and the like. Because the ultrahigh-strength structural member needs to bear higher stress in the service process, the ultrahigh-strength structural member has high sensitivity to cracks, pits with different shapes and the like caused by fatigue, impact, abrasion, corrosion and the like, and therefore, the repairing and remanufacturing are of great importance to the running cost and the safety of the ultrahigh-strength steel structural member. As a novel surface modification technology, laser cladding remanufacturing utilizes the characteristics of rapid heating and cooling of laser beams to clad the same or different metal powder on the surface of a repair piece. The technology has the advantages of compact cladding structure, high interface bonding strength, small member deformation, simple process and the like. The ultra-high strength steel structural member is repaired by adopting a laser cladding technology, so that the maintenance period can be greatly shortened, and the service life of the structural member is prolonged.
However, laser remanufacturing of the ultrahigh-strength steel structural member is not mature at the present stage, and the laser cladding martensite forming layer can be used for repairing the ultrahigh-strength steel structural member with fatigue cracking and abrasion damage, such as an undercarriage of an airplane and the like. However, the laser cladding martensite forming layer is equivalent to the surface quenching process, so that the integral tensile property and fatigue property of the forming layer are poor, the toughness is low, and the requirement on the actual repair working condition is strict because the good forming layer needs to be subjected to more complex subsequent treatment.
Patent CN 201910722197.2 discloses an aircraft 300M steel landing gear piston rod lip crack laser cladding modification method, but the method needs to determine a repair process on the basis of carrying out a fatigue test on a piston rod simulation piece, and has the disadvantages of more preliminary preparation work and poor universality. The patent CN 201710785371.9 discloses an electromagnetic stirring laser cladding modification method for cracks of an ultra-high strength steel drop frame, the deformation of a repaired component is controllable, and repaired components are free of defects, but the defect that the tissue thinning effect is not obvious exists.
The ultrasonic vibration is introduced in the laser cladding process, so that the fluidity of the cladding layer can be improved, bubbles can quickly escape, the tissue distribution is more uniform, the ultrasonic vibration is applied in the solidification process, the growing crystal grains can be broken, and the crystal grains are dispersed to each part of the cladding layer, so that small crystal nuclei which are uniformly distributed are formed. The ultrasonic vibration can also make liquid more easily supplement to the pores among crystals, thus being beneficial to reducing shrinkage cavity and partially eliminating the root cause generated by tensile stress, thereby reducing the cracks of the cladding layer. In addition, the cavitation and acoustic flow effects of the ultrasonic waves in the cladding layer are utilized, so that the temperature of each part of the cladding layer is homogenized, the solidification state of the cladding layer is improved, and the residual thermal stress and cracking sensitivity of the cladding layer are reduced. Patent CN 201611042347.8 discloses a method and an apparatus for preparing a crack-free cladding layer by ultrasonic vibration assisted laser cladding.
During the solidification process of the cladding layer, the material structure and the performance can be improved by applying the current. Considering that the position of a laser beam and a workpiece move relatively in the laser cladding process, if the position of an electrode for applying current and the workpiece are fixed, a cladding layer only accounts for a small part of a conductor, and most of the current does not pass through the cladding layer, so that the actual effect of the current is greatly reduced; if the electrode is fixed on the laser head to follow up, the electrode can be always positioned at a position close to the cladding layer and keeps the relative position with the cladding layer unchanged, on one hand, most of current can be introduced into the cladding layer, the current utilization efficiency is improved, on the other hand, the current density can be greatly improved due to the closer electrode distance, and the improvement effect is enhanced. Patent CN 201910821310.2 discloses a laser cladding device for cladding layer crack self-healing and a processing method thereof, which can realize the self-healing of cladding layer crack by adopting follow-up feeding pulse current to assist laser cladding.
However, whether ultrasonic vibration assisted laser cladding with a single auxiliary energy field or pulse current assisted laser cladding is adopted, when the ultrahigh-strength steel structural member is repaired, a martensite structure with uniform distribution is difficult to obtain, so that the fatigue performance and the toughness of the ultrahigh-strength steel structural member are influenced. Patent CN 201610114914.X discloses a method and a device for ultrasonic vibration-electromagnetic stirring composite energy field assisted laser cladding, which has a better cladding effect. Therefore, ultrasonic vibration and pulse current are combined, and the ultrasonic vibration-follow-up feeding pulse current composite energy field is expected to remarkably improve the laser cladding remanufacturing performance of the ultrahigh-strength steel.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a device for pulse current composite energy field assisted laser cladding.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pulse current composite energy field auxiliary laser cladding method is characterized in that: the method comprises the following steps:
s1, pre-treatment of cladding: before remanufacturing, firstly removing cracks and pits on the surface of the ultrahigh-strength steel by a mechanical processing method, opening and repairing a gap, secondly grinding and polishing the gap, and finally scrubbing by acetone or alcohol;
s2, cladding treatment: carrying out ultrasonic vibration-follow-up feeding pulse current composite energy field assisted coaxial powder feeding laser cladding remanufacturing and repairing by adopting the same material powder as the ultrahigh-strength steel substrate;
s3, cladding post-treatment: and (4) removing the machining allowance of the remanufacturing area by machining, recovering the size, and carrying out local stress relief annealing on the repairing area to eliminate residual stress.
The laser cladding process parameters in the step S2 are as follows: the powder granularity is 53-106 mu m, the laser power is 300-5000W, the laser scanning speed is 1-20 mm.s < -1 >, the laser spot diameter is 1-6mm, the used protective gas is argon, and the flow is 5-20 L.min < -1 >; the ultrasonic vibration technological parameters are as follows: the vibration frequency of the ultrasonic generator is 20-80kHZ, and the amplitude is 10-40 mu m; the pulse current technological parameters are as follows: the pulse current is rectangular square wave, the mean value of the pulse current is 10-250A, the pulse width is 50-5000 mus, and the pulse frequency is 40-4000 Hz.
The utility model provides a supplementary laser cladding device in pulse current complex energy field, includes laser instrument, pulse power supply, bottom plate, base member, supersonic generator and electrode assembly, pulse power supply connects electrode assembly's both ends, just be equipped with the laser head on the electrode assembly, just the laser instrument is connected to the one end of laser head, electrode assembly sets up in fixing the bottom plate top on the workstation, the laser head is used for launching the laser beam, carries out laser cladding to base member and cladding layer, the input of laser head still is provided with powder feeder, powder feeder is used for carrying the powder body to the base member surface to carry out the transport and cladding of cladding layer powder simultaneously at the laser cladding in-process.
Specifically, pulse power supply including set up respectively in the adjustable electrode subassembly at electrode assembly both ends, adjustable electrode subassembly with connect through adjustable connecting piece between the fixing base, adjustable connecting piece including set up in the spout of fixing base both ends bottom, be provided with the sliding block rather than matcing each other in the spout, the sliding block can be in the spout vertical migration, the sliding block with spout internally mounted has coupling spring, just the bottom of sliding block is rotated and is connected the roll electrode, just the roll electrode with contradict between the base member.
Specifically, a nozzle is mounted at the head of the laser and connected with a cooler, clamping plates are arranged at two ends of the bottom plate, and an insulating plate is arranged between the bottom plate and the base body; the splint comprise a rack, an adjusting rod, a fixing nut, a spring and a gear, the two ends of the splint are of a layered structure, and the gear is driven to rotate by the adjusting rod between the upper layer and the lower layer, so that the rack meshed with the gear is driven to move up and down, the rack is fixed on the upper layer, the fixing nut is connected with the external thread of the adjusting rod, a sliding groove is formed in the insulating plate, and the splint and the sliding groove are connected through the spring.
Specifically, the ultrasonic generator is connected with the transducer, and the transducer is connected with the bottom plate through a variable amplitude rod.
The invention has the beneficial effects that:
(1) the method and the device for assisting laser cladding by the pulse current composite energy field have the advantages of assisting laser cladding by ultrasonic vibration, can improve the fluidity of a cladding layer by introducing the ultrasonic vibration in the laser cladding process, enable bubbles to escape quickly, enable the tissue distribution to be more uniform, and enable the growing crystal grains to be broken up and dispersed to each part of the cladding layer by applying the ultrasonic vibration in the solidification process, thereby forming small crystal nuclei which are uniformly distributed. The ultrasonic vibration can also make liquid more easily supplement to the pores among crystals, thus being beneficial to reducing shrinkage cavity and partially eliminating the root cause generated by tensile stress, thereby reducing the cracks of the cladding layer.
(2) The method and the device for the pulse current composite energy field assisted laser cladding have the advantages of follow-up feeding of pulse current assisted laser cladding, the rolling electrode is adopted to introduce most of current into the cladding layer in the repair area, the current utilization efficiency is improved, the current density can be greatly improved due to the closer electrode distance, the laser remanufacturing efficiency can be improved, the grains of the cladding layer can be refined, the porosity of the cladding layer is reduced, the structure of the cladding layer is uniform, the residual thermal stress and the cracking sensitivity of the cladding layer can be reduced, particularly the online self-healing of the cracks of the cladding layer can be realized due to the streaming effect and the Joule thermal effect of the pulse high current density formed at the tips of the cracks of the cladding layer, and the problem that the laser remanufacturing cladding layer is easy to crack is solved. In addition, by means of the strengthening effect of the follow-up feeding pulse current on the remanufactured cladding layer, on one hand, the position of a fatigue crack source of a repair part can be changed, the crack initiation time is greatly delayed, the crack propagation rate is effectively reduced, the fatigue life of a component is prolonged, and on the other hand, the wear resistance and the corrosion resistance of the repair area can be improved by the strengthening effect.
(3) According to the method and the device for assisting laser cladding by the pulse current composite energy field, two physical fields of ultrasonic vibration and follow-up feeding pulse current are combined together, the effect of cooperatively regulating and controlling the tissue of the ultra-high strength steel repairing layer is achieved by adjusting parameters, the advantages of respective energy fields of ultrasonic vibration and pulse current are exerted, the performance of a cladding remanufacturing layer is obviously improved compared with the effect of single ultrasonic vibration or pulse current, and the method and the device are particularly suitable for remanufacturing the ultra-high strength steel with high performance requirements.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the splint of the present invention;
FIG. 3 is an enlarged view of the position A in FIG. 1 according to the present invention.
In the figure: 1. the device comprises a pulse power supply, 2, a laser head, 3, a nozzle, 4, a cladding layer, 5, a repairing layer, 6, an electrode device, 61, a connecting spring, 62, a fixed seat, 63, a sliding groove, 64, a sliding block, 65, a rolling electrode, 7, a clamping plate, 71, a rack, 72, an adjusting rod, 73, a fixing nut, 74, a spring, 75, a gear, 8, an insulating plate, 81, a sliding groove, 9, a variable amplitude rod, 10, a transducer, 11, an ultrasonic generator, 12, a bottom plate, 13, a base body, 14, a powder feeder, 15, a cooler, 16 and a laser.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 3, a pulsed current composite energy field assisted laser cladding method includes the following steps:
s1, pre-treatment of cladding: before remanufacturing, firstly removing cracks and pits on the surface of the ultrahigh-strength steel by a mechanical processing method, opening and repairing a gap, secondly grinding and polishing the gap, and finally scrubbing by acetone or alcohol;
s2, cladding treatment: carrying out ultrasonic vibration-follow-up feeding pulse current composite energy field assisted coaxial powder feeding laser cladding remanufacturing and repairing by adopting the same material powder as the ultrahigh-strength steel substrate;
s3, cladding post-treatment: and (4) removing the machining allowance of the remanufacturing area by machining, recovering the size, and carrying out local stress relief annealing on the repairing area to eliminate residual stress.
The laser cladding process parameters in the step S2 are as follows: the powder particle size is 53-106 μm, the laser power is 300--1The diameter of laser spot is 1-6mm, the used protective gas is argon, and the flow rate is 5-20 L.min-1(ii) a The ultrasonic vibration technological parameters are as follows: the vibration frequency of the ultrasonic generator is 20-80kHZ, and the amplitude is 10-40 mu m; the pulse current technological parameters are as follows: the pulse current is rectangular square wave, the mean value of the pulse current is 10-250A, the pulse width is 50-5000 mus, and the pulse frequency is 40-4000 Hz.
The utility model provides a supplementary laser cladding device in pulse current complex energy field, includes laser instrument 16, pulse power supply 1, bottom plate 12, base member 13, supersonic generator 11 and electrode device 6, pulse power supply 1 is connected electrode device 6's both ends, just be equipped with laser head 2 on electrode device 6, just laser instrument 16 is connected to laser head 2's one end, electrode device 6 sets up in fixing the bottom plate 12 top on the workstation, laser head 2 is used for launching the laser beam, carries out laser cladding to base member 13 and cladding layer 4, laser head 2's input still is provided with powder feeder 14, powder feeder 14 is used for carrying the powder body to base member 13 surface to carry out the transport and the cladding of cladding layer powder simultaneously at the laser cladding in-process.
Specifically, pulse power supply 1 including set up respectively in the adjustable electrode subassembly at 6 both ends of electrode assembly, adjustable electrode subassembly with connect through adjustable connecting piece between the fixing base 62, adjustable connecting piece including set up in the spout 63 of fixing base 62 both ends bottom, be provided with in the spout 63 with its sliding block 64 that matches each other, sliding block 64 can be in spout 63 vertical migration, sliding block 64 with spout 63 internally mounted has connecting spring 61, just sliding block 64's bottom is rotated and is connected rolling electrode 65, just rolling electrode 65 with contradict between the base member 13.
Specifically, a nozzle 3 is mounted at the head of the laser 2, the nozzle 3 is connected with a cooler 15, clamping plates 7 are arranged at two ends of a bottom plate 12, and an insulating plate 8 is arranged between the bottom plate 12 and the base 13; splint 7 includes rack 71, adjusts pole 72, fixation nut 73, spring 74 and gear 75, splint 7 both ends are layered structure, and drive gear 75 through adjusting pole 72 between the upper and lower layer and rotate to the rack 71 that drives and gear 75 meshing reciprocates, just rack 71 is fixed on the upper strata, adjust the outside threaded connection fixation nut 73 of pole 72, be equipped with spout 81 on the insulation board 8, be connected through spring 74 between splint 7 and the spout 81.
Specifically, the ultrasonic generator 11 is connected with a transducer 10, and the transducer 10 is connected with a bottom plate 12 through an amplitude transformer 9.
The cladding material is 30 CrMnSiA. During the laser cladding operation of the prefabricated coating, the powder feeder 14 does not need to be configured, or during the laser cladding of the prefabricated coating, the powder feeder 14 does not work; since the cracks of the cladding layer 4 are perpendicular to the laser scanning direction during laser cladding, the effect of repairing and healing the cracks of the cladding layer 4 is best when the rolling electrode 65 is arranged in parallel to the laser scanning direction. The clamping plates 7 are arranged at the front end and the rear end of the repairing base body 13, the base body 13 is fixed, the clamping plates 7 with the same width and thickness as the workpiece are arranged at the front end and the rear end of the workpiece along the laser scanning direction, the side faces of the workpiece are clamped by the clamping plates 7, therefore, even if the repairing area is arranged at the edge of the workpiece, even if one rolling electrode 65 exceeds the range of the workpiece, the rolling electrode can be pressed on the clamping plates, and the two electrodes form a current loop through the workpiece and the clamping plates. Meanwhile, the layered design of the clamping plate 7 can enable the clamping plate 7 to be suitable for the base bodies 13 with different widths and can also adapt to the base bodies 13 with different thicknesses, the gear 75 is driven to rotate through the adjustment of the adjusting rod 72, the adjusting rod 72 is fixedly connected with the gear 75, the gear 75 drives the rack 71 to move up and down, when the height of the surface of the base body 13 is adjusted, the height is fixed through the fixing nut 73, the clamping plate 7 is slidably connected with the insulating plate 8, the base bodies 13 are fixed through the spring 74, the base bodies 13 with different thicknesses and different widths can be conveniently repaired, and the repaired cladding layer 5 can meet the use requirement.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. A pulse current composite energy field auxiliary laser cladding method is characterized in that: the method comprises the following steps:
s1, pre-treatment of cladding: before remanufacturing, firstly removing cracks and pits on the surface of the ultrahigh-strength steel by a mechanical processing method, opening and repairing a gap, secondly grinding and polishing the gap, and finally scrubbing by acetone or alcohol;
s2, cladding treatment: carrying out ultrasonic vibration-follow-up feeding pulse current composite energy field assisted coaxial powder feeding laser cladding remanufacturing and repairing by adopting the same material powder as the ultrahigh-strength steel substrate;
s3, cladding post-treatment: and (4) removing the machining allowance of the remanufacturing area by machining, recovering the size, and carrying out local stress relief annealing on the repairing area to eliminate residual stress.
2. The method for pulsed current combined energy field assisted laser cladding as claimed in claim 1, wherein: the laser cladding process parameters in the step S2 are as follows: the powder particle size is 53-106 μm, the laser power is 300--1The diameter of laser spot is 1-6mm, the used protective gas is argon, and the flow rate is 5-20 L.min-1(ii) a The ultrasonic vibration technological parameters are as follows: the vibration frequency of the ultrasonic generator is 20-80kHZ, and the amplitude is 10-40 mu m; the pulse current technological parameters are as follows: the pulse current is rectangular square wave, the mean value of the pulse current is 10-250A, the pulse width is 50-5000 mus, and the pulse frequency is 40-4000 Hz.
3. The device applied to the pulse current composite energy field assisted laser cladding method of claims 1-2 is characterized in that: including laser instrument (16), pulse power supply (1), bottom plate (12), base member (13), supersonic generator (11) and electrode assembly (6), pulse power supply (1) is connected the both ends of electrode assembly (6), just be equipped with laser head (2) on electrode assembly (6), just laser instrument (16) are connected to the one end of laser head (2), electrode assembly (6) set up in fixing bottom plate (12) top on the workstation, laser head (2) are used for launching the laser beam, carry out laser cladding to base member (13) and cladding layer (4), the input of laser head (2) still is provided with powder feeder (14), powder feeder (14) are used for carrying the powder body to base member (13) surface to carry out the transport and the cladding of cladding layer powder simultaneously at the laser cladding in-process.
4. The pulsed current combined energy field assisted laser cladding device of claim 3, wherein: pulse power supply (1) including set up respectively in the adjustable electrode subassembly at electrode assembly (6) both ends, adjustable electrode subassembly with connect through adjustable connecting piece between fixing base (62), adjustable connecting piece including set up in spout (63) of fixing base (62) both ends bottom, be provided with in spout (63) with its sliding block (64) that matches each other, sliding block (64) can be in spout (63) vertical migration, sliding block (64) with spout (63) internally mounted has connecting spring (61), just the bottom of sliding block (64) is rotated and is connected rolling electrode (65), just rolling electrode (65) with contradict between base member (13).
5. The pulsed current combined energy field assisted laser cladding device of claim 4, wherein: the head of the laser (2) is provided with a nozzle (3), the nozzle (3) is connected with a cooler (15), two ends of the bottom plate (12) are provided with clamping plates (7), and an insulating plate (8) is arranged between the bottom plate (12) and the base body (13); splint (7) are including rack (71), regulation pole (72), fixation nut (73), spring (74) and gear (75), splint (7) both ends are layered structure, and drive gear (75) through adjusting pole (72) and rotate between the upper and lower floor to drive rack (71) with gear (75) meshing and reciprocate, just rack (71) are fixed on the upper strata, adjust outside threaded connection fixation nut (73) of pole (72), be equipped with spout (81) on insulation board (8), be connected through spring (74) between splint (7) and spout (81).
6. The pulsed current combined energy field assisted laser cladding device of claim 5, wherein: the ultrasonic generator (11) is connected with the transducer (10), and the transducer (10) is connected with the bottom plate (12) through the amplitude transformer (9).
CN202111130752.6A 2021-09-26 2021-09-26 Method and device for pulse current composite energy field assisted laser cladding Withdrawn CN113862664A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115141928A (en) * 2022-07-14 2022-10-04 电子科技大学 Electromagnetic toughening method and system for shaft type solid part
CN115386845A (en) * 2022-08-30 2022-11-25 江苏大学 Device and method for pulse current assisted laser directional energy deposition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115141928A (en) * 2022-07-14 2022-10-04 电子科技大学 Electromagnetic toughening method and system for shaft type solid part
CN115141928B (en) * 2022-07-14 2023-07-04 电子科技大学 Electromagnetic toughening method and system for shaft solid part
CN115386845A (en) * 2022-08-30 2022-11-25 江苏大学 Device and method for pulse current assisted laser directional energy deposition

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Application publication date: 20211231