CN109778184A - A kind of preparation method of metal-doped modified turbine blade laser melting coating surface covering - Google Patents
A kind of preparation method of metal-doped modified turbine blade laser melting coating surface covering Download PDFInfo
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- 238000002844 melting Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 68
- 238000005260 corrosion Methods 0.000 claims abstract description 32
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- 239000002131 composite material Substances 0.000 claims abstract description 19
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- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
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- 238000005422 blasting Methods 0.000 claims description 3
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Abstract
The invention discloses a kind of preparation methods of metal-doped modified turbine blade laser melting coating surface covering, comprising: 17-4PH stainless steel blade basis material cleaning pretreatment；The doped molybdenum powder in 17-4PH powder is sufficiently mixed uniformly in the ball mill, and heating, drying in drying oven is spare as laser melting coating composite powder；It, will be on the 17-4PH stainless steel blade matrix of laser melting coating composite powder cladding after the pre-treatment using laser melting and coating process under the conditions of argon gas；Micro-Structure Analysis and performance detection are carried out to coating.Its hardness height, corrosion resistance excellent, structural stability it is good and with matrix metallurgical bonding, cost is reasonable, can better meet turbo power mechanical engineering service demand.
Description
Technical field
The invention belongs to field of surface engineering technique, in particular to a kind of metal-doped modified 17-4PH blade martensite
The design preparation method of stainless steel laser cladding surface corrosion resistance wear-resistant coating, this method belong to turbo power mechanical engineering and remanufacture
A kind of surfacecti proteon new material application technology in field.
Background technique
With greatly developing for circular economy, blast furnace energy recovery turbine (abbreviation TRT) is obtained in China's field of metallurgy
It is widely applied, effectively reduces the discharge of industrial waste gas, achieve good economic benefits and social benefit.Such turbine it is long-term
Safe operation is the key point for guaranteeing high capacity of furnace and persistently recycling.Wherein, TRT blade is blast furnace energy recovery turbine equipment
Kernel component, security reliability directly affect the long-acting operation of unit.Meanwhile the and replacement cycle expensive in view of blade
It needs, carries out rapid dimensional reparation frequently with thermal spraying and laser melting and coating technique at present.During remanufacturing, TRT blade table
The high-performance of face repair layer, which is promoted, becomes the technical problem being safely operated after such spare parts remanufacture.This runs work derived from blade
Condition is extremely severe, specific manifestation are as follows: (1) working media is mostly the various industrial gasses or blast furnace tail of 60~550 DEG C of temperature ranges
Gas contains CO, SO2, CO2, H2S, Cl-, steam, salt fog, tar, the various corrosive medias such as naphthalene often easily cause blade material
Shots erosion；(2) it is mingled with Al in air-flow2O3、SiO2The different magnitude of tiny hard abrasive such as dust, high speed rotational blade are subject to
Erosion caused by gas shock and abrasion；(3) it is remanufactured under the premise of meeting surface corrosion resistance wearability, also needs to take into account reparation
The matching of layer and matrix, to meet high bending stress and the synergistic effect of centrifugal force when blade rotation uses.
Under the requirement of above-mentioned complex working condition, developing the applicable surface covering that remanufactures is that current such turbine blade engineering is real
The technical problem that interphase faces.
In view of this, common technological means is related to two kinds, one is thermal spraying, another kind is laser melting coating.Using thermal jet
When painting technology, in coating materials such as the coating of the turbine blade surface of stainless steel material Ni-Cr-Al, Co-WC.This method can not
Anti-corrosion and wearability is taken into account, particular for highly corrosive and containing granule medium is washed away, repairing surface layer corrosion-proof wear can not expire
Sufficient actual demand.A large amount of point corrosion pit, coating flaking even corruption are often shown after remanufacturing blade military service a period of time
Borrosion hole deeply to a variety of typical failure features such as blade base, seriously threatens the long-term safety operation of turbine plant.Using laser
When melting and coating technique, repairing sizes and property are directly carried out using the good Co based alloy of corrosion resistance good Ni base or wearability on blade
It can restore.There are problems that the matching of repair layer and matrix, while high production cost, technological applicability using such coating material
Difference.How the turbine blade reparation being on active service as a result, for heavy corrosion and scour medium, design effective surface protection technique simultaneously
It is the focus and difficult point of the research field using the implementation of reasonable technology.
Summary of the invention
To solve drawbacks described above existing in the prior art, the purpose of the present invention is to provide a kind of blast furnace energy regenerating is saturating
Flat blade remanufactures the preparation method with surface protecting layer.This method is mixed using coaxial powder-feeding formula laser melting coating means by metal
Miscellaneous modified preparation 17-4PH martensitic stain less steel blade steel surface protective layer, hardness height, corrosion resistance excellent, structural stability
It is good and with matrix metallurgical bonding, cost is reasonable, can better meet service demand.
The present invention is realized by following technical proposals.
A kind of preparation method of metal-doped modified turbine blade laser melting coating surface covering, includes the following steps:
1) 17-4PH stainless steel blade basis material is cleaned and is pre-processed；
2) the Mo powder that mass ratio is 1.0~4.0wt% is adulterated in 17-4PH powder, and mixed-powder is poured into ball mill
It is sufficiently mixed uniformly, is put into heating, drying in drying oven later, it is spare as laser melting coating composite powder；
3) use fiber laser device, using argon gas as carrier gas under the conditions of, will be in step 2) using laser melting and coating process
The cladding of laser melting coating composite powder is on the pretreated 17-4PH stainless steel blade matrix of step 1)；
4) it is finished to cladding, Micro-Structure Analysis and performance detection is carried out to coating.
Further, in the step 1), to increase laser absorption rate, make surface roughening, to 17-4PH stainless steel blade
Surface is first polished with silicon carbide paper, then through blasting treatment, then carries out ultrasonic cleaning, drying with alcohol or acetone.
Further, in the step 2), Mo powder purity >=99.9%；17-4PH powder purity >=99.9%, chemical component
It is identical as substrate；It is sufficiently mixed 60~120min, drum's speed of rotation 200r/min in a planetary ball mill, later at 150 DEG C
3~5h of lower drying, removes the middle moisture that powders away.
Further, the composite powder mass percent proportion are as follows: 1.0~4.0%Mo；15.0~16.0%Cr；3.5~
4.5%Ni；2.8~3.5%Cu；0.15~0.35%Nb；C < 0.05%；Si < 1.0%；Mn < 0.5%；S < 0.03%；P<
0.03%；71.0~76.0%Fe.
Further, the composite powder granularity is 45~110 μm, powder sphericity >=95%.
Further, in the step 3), using semiconductor light fibre laser, using coaxial powder-feeding mode, laser power
1200~1500W, 600~800mm/min of scanning speed, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar air pressure 0.05MPa,
By on the 17-4PH stainless steel blade matrix of laser melting coating composite powder cladding after the pre-treatment, overlapping rate 33.3%~
66.7%.
Further, in the step 3), make the control of laser cladding coating overall thickness in 300~2000 μ by multiple tracks cladding
m。
Further, coating metallographic structure is the mixing backed weave structure of dendroid martensite and austenite, and with lath
Based on shape martensite, 290~405HV of hardness0.1, alloy-layer average corrosion rate is 0.55~1.68g/ (m2·h)。
Further, the serious operating condition of corrosion-proof wear is directed in the way of laser melting coating using the doping vario-property alloy powder
Military service 17-4PH turbine blade is repaired.
Beneficial effects of the present invention are as follows:
The present invention uses fiber laser device, by adjusting Mo alloying element doping ratio, and controls laser melting and coating process
Parameter carries out remanufacturing surface covering preparation on 17-4PH stainless steel blade.
To guarantee that repair layer and basis material have matched well, utilized using laser means congruent with matrix
17-4PH metal powder is repaired.Meanwhile to improve repair layer corrosion-proof wear with certain proportion doped alloys elements Mo.Mo
Alloying element has stronger carbide Forming ability, and mentioning high Mo content will lead to the diminution of single-phase martensite area, moreover it is possible in geneva
Play the role of solution strengthening in body stainless steel, to effectively improve the intensity and hardness of material.Simultaneously as the addition of Mo mentions
The high corrosion resistance of material, so that the γ phase region of 17-4PH stainless steel cladding layer reduces, formation γ phase is enclosed, and promotes anti-local corrosion
Performance.In addition, laser melting coating repair layer is repaired because being reduced using the congruent powder of 17-4PH matrix compared with plasma spray technology
Mismatch between multiple part and matrix coefficient of thermal expansion, has effectively evaded cladding layer cracking risk.With traditional Ni base or Co base
The irreplaceable advantage of Alloy by Laser cladding layer.It may be noted that the excessive doping of Mo alloying element can also induce local hard
It is mutually generated in the process extremely cold, then induces cladding layer underbead crack.Rationally control doping content is particularly important as a result,.It is based on
This, the present invention carries out the preparation of TRT blade high corrosion resistant coating using the composite powder of the metal-doped modification of laser melting coating.It is real
It tests and shows that the combination of this coating and preparation method is remarkably improved the use that blast furnace energy recovery turbine blade remanufactures components
Service life.
Detailed description of the invention
Fig. 1 (a), (b) are respectively to adulterate the sample metallographic structure photo that Mo ratio is 1.0wt% (a) and 4.0wt% (b)；
The sample that Fig. 2 (a)-(c) is respectively 17-4PH matrix (a) and doping Mo ratio is 1.0wt% (b) and 4.0wt% (c)
Photo is compared after product salt air corrosion 720h.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawings and examples, but is not intended as doing invention any limit
The foundation of system.
The present invention prepares metal-doped modification in turbine blade matrix surface using coaxial powder-feeding formula fiber laser device
Laser melting coating corrosion-proof wear coating, includes the following steps:
1) 17-4PH stainless steel blade basis material is cleaned and is pre-processed.To increase laser absorption rate, make surface
Roughening, first polishes to 17-4PH stainless steel blade surface, then through blasting treatment, then use alcohol with 600# silicon carbide paper
Or acetone carries out ultrasonic cleaning, drying.
2) Mo powder (purity >=99.9%) with the ratio of 1.0~4.0wt% and 17-4PH powder, (change by purity >=99.9%
Study point identical as substrate) doping；Wherein, composite powder mass percent matches are as follows: 1.0~4.0%Mo；15.0~16.0%
Cr；3.5~4.5%Ni；2.8~3.5%Cu；0.15~0.35%Nb；C < 0.05%；Si < 1.0%；Mn < 0.5%；S<
0.03%；P < 0.03%；71.0~76.0%Fe.Mixed-powder is poured into planetary ball mill and is sufficiently mixed 60~
120min, drum's speed of rotation 200r/min dry 3~5h at 150 DEG C later, remove the middle moisture that powders away；Composite powder granularity
It is 45~110 μm, sphericity >=95%.
3) use fiber laser device, using hydrogen as carrier gas under the conditions of, to the pretreated matrix of step 1) using sharp
Light melting and coating process is by the powder melting in step 2) on matrix；Using semiconductor light fibre laser, using coaxial powder-feeding mode；
1200~1500W of laser power, 600~800mm/min of scanning speed, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar air pressure
0.05MPa, overlapping rate 33.3%~66.7%.By multiple tracks cladding means, 1~3 layer of laser melting coating, laser cladding coating thickness
Control is at 300 μm~900 μm.
4) it is completed to cladding, Micro-Structure Analysis and performance detection is carried out to coating.
Coating is characterized using Olympus BX51M metallographic microscope and Hirox KH-7700 digital three-dimensional videomicroscopy
Microstructure；Coating microhardness is measured using HXD-1000 microhardness testers；Using SY/Q-750 type salt-mist corrosion tester
Corrosion resistance coating evaluation is carried out with CS150 type electrochemical workstation.
Wherein, salt spray corrosion test condition is see table 1.When electrochemistry experiment, it is 3.5% that corrosive medium, which selects mass fraction,
NaCl solution, NaCl used is analytical reagents, and solution is deionized water with water, 90 ± 2 DEG C of experimental temperature.
1 salt spray corrosion test condition of table
Sample selection in present embodiment is identical as energy recovery turbine blade material, can demonstrate,prove from the above test result
Bright, the energy recovery turbine blade progress that modified coating prepared by the present invention can be on active service to corrosion-proof wear operating condition is effectively made again
It makes, and embodiment illustrates which works well, laser cladding coating metallographic structure is the mixed of dendroid martensite and austenite
Backed weave structure is closed, and based on lath martensite, 290~405HV of hardness0.1, without obvious corrosion after salt spray test 720h
Product, alloy-layer average corrosion rate are 0.55~1.68g/ (m2H), 1 times or more is improved than the corrosion resistance of matrix.
The present invention is described in further details below by specific embodiment.
Embodiment 1
Metal-doped modified laser cladding is carried out using coaxial powder-feeding formula fiber laser device on 17-4PH stainless steel to apply
Layer preparation.
Mo alloy powder and 17-4PH the powder weight proportion adulterated in laser cladding powder in the present embodiment are 1:99, multiple
The conjunction specific ratio of powder be 1.0%Mo, 15.0%Cr, 4.0%Ni, 3.1%Cu, 0.24%Nb, 0.04%C, 1.0%Si,
0.4%Mn, 0.025%S, 0.03%P, 75.17%Fe.Composite powder is through ball mill mixing 60min, 150 DEG C of drying 3h later
For use.When laser melting coating, laser power 1200W, scanning speed 600mm/min, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar
Air pressure 0.05MPa, overlapping rate 33.3%；1 layer of laser melting coating, 320 μm of coating final thickness.
The coating structure of preparation is uniform, compactness is good, and metallographic structure is the mixing two of dendroid martensite and austenite
Re-organized structure, and based on lath martensite, 315 ± 17.32HV of hardness0.1, electrochemical test corrosion potential EcorrAnd corruption
Lose electric current IcorrRespectively -0.237V and 2.68 × 10-7A/cm3, salt air corrosion environment lower substrate becomes rusty with cladding alloy-layer
The time of spot is respectively 60h and 135h, and average corrosion rate is respectively 2.55g/ (m2And 1.55g/ (m h)2·h).Cladding applies
Layer significantly improves the salt fog resistance corrosive power of matrix, extends the service life of material.
Embodiment 2
Metal-doped modified laser cladding is carried out using coaxial powder-feeding formula fiber laser device on 17-4PH stainless steel to apply
Layer preparation.
Mo alloy powder and 17-4PH the powder weight proportion adulterated in laser cladding powder in the present embodiment are 2:98, multiple
The conjunction specific ratio of powder be 2.0%Mo, 15.9%Cr, 3.5%Ni, 2.8%Cu, 0.15%Nb, 0.04%C, 0.8%Si,
0.5%Mn, 0.028%S, 0.025%P, 74.26%Fe.Composite powder is through ball mill mixing 60min, 150 DEG C of drying 5h later
For use；When laser melting coating, laser power 1350W, scanning speed 700mm/min, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar
Air pressure 0.05MPa, overlapping rate 66.7%；1 layer of laser melting coating, 390 μm of coating final thickness.
The coating structure of preparation is uniform, compactness is good, and metallographic structure is the mixing two of dendroid martensite and austenite
Re-organized structure, and based on lath martensite, 338 ± 16.54HV of hardness0.1, electrochemical test corrosion potential EcorrAnd corruption
Lose electric current IcorrRespectively -0.135V and 1.93 × 10-7A/cm3, salt air corrosion environment lower substrate becomes rusty with cladding alloy-layer
The time of spot is respectively 60h and 150h, and average corrosion rate is respectively 2.55g/ (m2And 1.08g/ (m h)2·h).Cladding applies
Layer significantly improves the salt fog resistance corrosive power of matrix, extends the service life of material.
Embodiment 3
Metal-doped modified laser cladding is carried out using coaxial powder-feeding formula fiber laser device on 17-4PH stainless steel to apply
Layer preparation.
Mo alloy powder and 17-4PH the powder weight proportion adulterated in laser cladding powder in the present embodiment are 4:96, multiple
The conjunction specific ratio of powder be 4.0%Mo, 15.3%Cr, 4.5%Ni, 3.5%Cu, 0.32%Nb, 0.03%C, 0.6%Si,
0.5%Mn, 0.029%S, 0.027%P, 71.20%Fe.Composite powder is through ball mill mixing 120min, later 150 DEG C of drying
3h is stand-by；When laser melting coating, laser power 1500W, scanning speed 800mm/min, powder feeding pressure 0.3MPa, powder feeding voltage 20V,
Ar air pressure 0.05MPa, overlapping rate 50.0%；3 layers of laser melting coating, 830 μm of coating final thickness.
The coating structure of preparation is uniform, compactness is good, and metallographic structure is the mixing two of dendroid martensite and austenite
Re-organized structure, and based on lath martensite, 387 ± 18.15HV of hardness0.1, electrochemical test corrosion potential EcorrAnd corruption
Lose electric current IcorrRespectively -0.108V and 1.16 × 10-7A/cm3, salt air corrosion environment lower substrate becomes rusty with cladding alloy-layer
The time of spot is respectively 70h and 170h, and average corrosion rate is respectively 2.55g/ (m2And 0.66g/ (m h)2·h).Cladding applies
Layer significantly improves the salt fog resistance corrosive power of matrix, extends the service life of material.
Embodiment 4
Coaxial powder-feeding formula fiber laser device is used on certain user's energy recovery turbine unit 17-4PH stainless steel blade
Carry out metal-doped modified laser cladding coating preparation.
Mo alloy powder and 17-4PH the powder weight proportion adulterated in laser cladding powder in the present embodiment are 3:97, multiple
The conjunction specific ratio of powder be 3.0%Mo, 16.0%Cr, 4.2%Ni, 3.3%Cu, 0.35%Nb, 0.05%C, 0.9%Si,
0.4%Mn, 0.03%S, 0.029%P, 71.74%Fe.Composite powder is through ball mill mixing 100min, 150 DEG C of drying 4h later
For use；When laser melting coating, laser power 1400W, scanning speed 650mm/min, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar
Air pressure 0.05MPa, overlapping rate 66.7%；1 layer of laser melting coating, 380 μm of coating final thickness.
Fig. 1 (a), (b) are respectively to adulterate the sample metallographic structure photo that Mo ratio is 1.0wt% (a) and 4.0wt% (b).
The sample salt fog that Fig. 2 (a)-(c) is respectively 17-4PH matrix (a) and doping Mo ratio is 1.0wt% (b) and 4.0wt% (c) is rotten
Photo is compared after erosion 720h.Coating structure prepared by the present invention is uniform, compactness is good, metallographic structure be dendroid martensite and
The mixing backed weave structure of austenite, and based on lath martensite；Coating repair position smoothly transit, dye penetrant inspection without
Defect, 362 ± 13.76HV of hardness0.1；Presentation quality is good after implementation, meets technical requirements, and operational effect is steady after putting into operation.
The present invention is prepared for being suitable for turbine blade reparation using laser cladding method by the method for metal-doped modification
High-performance coating.Compared with traditional thermal spraying and routine Ni base or Co based alloy, prepared coating and the smelting of same material matrix
Gold combines, and thickness is controllable, and corrosion resistance coating wearability is good, needed for having taken into account TRT corrosion resistance characteristic and resistance to dust abrasiveness, protects
Effective extension of blast furnace energy recovery turbine blade service life is demonstrate,proved.
The present invention is not limited to the above embodiments, on the basis of technical solution disclosed by the invention, the skill of this field
For art personnel according to disclosed technology contents, one can be made to some of which technical characteristic by not needing creative labor
A little replacements and deformation, these replacements and deformation are within the scope of the invention.
Claims (9)
1. a kind of preparation method of metal-doped modified turbine blade laser melting coating surface covering, which is characterized in that including following
Step:
1) 17-4PH stainless steel blade basis material is cleaned and is pre-processed；
2) the Mo powder that mass ratio is 1.0~4.0wt% is adulterated in 17-4PH powder, and mixed-powder is poured into ball mill sufficiently
It is uniformly mixed, is put into heating, drying in drying oven later, it is spare as laser melting coating composite powder；
3) use fiber laser device, using argon gas as carrier gas under the conditions of, using laser melting and coating process, by the laser in step 2)
The cladding of cladding composite powder is on the pretreated 17-4PH stainless steel blade matrix of step 1)；
4) it is finished to cladding, Micro-Structure Analysis and performance detection is carried out to coating.
2. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is, in the step 1), is first polished with silicon carbide paper 17-4PH stainless steel blade surface, then through blasting treatment,
Then ultrasonic cleaning, drying are carried out with alcohol or acetone.
3. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is, in the step 2), Mo powder and 17-4PH powder purity >=99.9%.
4. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is, in the step 2), is sufficiently mixed 60~120min, drum's speed of rotation 200r/min in a planetary ball mill, it
3~5h is dried at 150 DEG C afterwards.
5. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is that the composite powder mass percent matches are as follows: 1.0~4.0%Mo；15.0~16.0%Cr；3.5~4.5%Ni；
2.8~3.5%Cu；0.15~0.35%Nb；C < 0.05%；Si < 1.0%；Mn < 0.5%；S < 0.03%；P < 0.03%；71.0
~76.0%Fe.
6. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is that the composite powder granularity is 45~110 μm, powder sphericity >=95%.
7. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is, in the step 3), using semiconductor light fibre laser, and using coaxial powder-feeding mode, laser power 1200~
1500W, 600~800mm/min of scanning speed, powder feeding pressure 0.3MPa, powder feeding voltage 20V, Ar air pressure 0.05MPa, by laser
On the 17-4PH stainless steel blade matrix of cladding composite powder cladding after the pre-treatment, overlapping rate 33.3%~66.7%.
8. the preparation method of metal-doped modified turbine blade laser melting coating surface covering according to claim 1, special
Sign is, in the step 3), makes the control of laser cladding coating overall thickness at 300~2000 μm by multiple tracks cladding.
9. a kind of metal-doped modified turbine blade laser melting coating surface of any one of claim 1-8 the method preparation applies
Layer, which is characterized in that coating metallographic structure is the mixing backed weave structure of dendroid martensite and austenite, and with lath-shaped
Based on martensite, 290~405HV of hardness0.1, alloy-layer average corrosion rate is 0.55~1.68g/ (m2·h)。
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| CN110181049A (en) * | 2019-05-31 | 2019-08-30 | 西安文理学院 | The preparation method of austenite composite gradient material based on laser solid forming technology |
| CN112692292A (en) * | 2020-12-10 | 2021-04-23 | 浙江翰德圣智能再制造技术有限公司 | Process method for repairing and strengthening 17-4PH part by laser |
| CN113634766A (en) * | 2021-08-10 | 2021-11-12 | 上海毅速激光科技有限公司 | Preparation method of mold insert based on 3D printing technology |
| CN115178732A (en) * | 2022-06-13 | 2022-10-14 | 东莞市华研新材料科技有限公司 | Corrosion-resistant alloy powder based on martensitic stainless steel and injection molding method thereof |
| CN115717223A (en) * | 2021-08-24 | 2023-02-28 | 中国石油天然气集团有限公司 | Iron-based alloy powder resistant to microbial corrosion and using method thereof |
| EP4104953A4 (en) * | 2020-03-12 | 2023-08-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for manufacturing additively manufactured article, and additively manufactured article |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181049A (en) * | 2019-05-31 | 2019-08-30 | 西安文理学院 | The preparation method of austenite composite gradient material based on laser solid forming technology |
| EP4104953A4 (en) * | 2020-03-12 | 2023-08-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for manufacturing additively manufactured article, and additively manufactured article |
| CN112692292A (en) * | 2020-12-10 | 2021-04-23 | 浙江翰德圣智能再制造技术有限公司 | Process method for repairing and strengthening 17-4PH part by laser |
| CN113634766A (en) * | 2021-08-10 | 2021-11-12 | 上海毅速激光科技有限公司 | Preparation method of mold insert based on 3D printing technology |
| CN113634766B (en) * | 2021-08-10 | 2023-02-24 | 上海毅速激光科技有限公司 | Preparation method of mold insert based on 3D printing technology |
| CN115717223A (en) * | 2021-08-24 | 2023-02-28 | 中国石油天然气集团有限公司 | Iron-based alloy powder resistant to microbial corrosion and using method thereof |
| CN115717223B (en) * | 2021-08-24 | 2023-12-15 | 中国石油天然气集团有限公司 | Antimicrobial corrosion-resistant iron-based alloy powder and use method thereof |
| CN115178732A (en) * | 2022-06-13 | 2022-10-14 | 东莞市华研新材料科技有限公司 | Corrosion-resistant alloy powder based on martensitic stainless steel and injection molding method thereof |
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