CN110181060A - The experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension - Google Patents
The experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension Download PDFInfo
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- 229910001040 Beta-titanium Inorganic materials 0.000 title claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 239000000956 alloy Substances 0.000 title claims abstract description 33
- 238000002474 experimental method Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 43
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 13
- 238000005498 polishing Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000012512 characterization method Methods 0.000 claims description 8
- 244000137852 Petrea volubilis Species 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
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- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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Abstract
The object of the present invention is to provide a kind of experimental methods of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension, the beta-titanium alloy of cube is obtained by laser direct forming, process the titanium alloy sample of the smooth cylindrical body of both ends of the surface, the oxide layer on polishing removal titanium alloy sample surface, titanium alloy sample both ends of the surface are completely attached to two electrode of Electric Pulse Treatment equipment respectively, the electric current and action time for adjusting Electric Pulse Treatment equipment carry out Electric Pulse Treatment to titanium alloy sample, titanium alloy sample is cut and passes through the embedding legal system of hot insert and obtains metallographic specimen, it polishes metallographic specimen surface, polishing, cleaning and corrosion, characterize the grain size of corrosion front and back respectively using electron probe microscope and metallographic microscope, sample crystallite dimension variation before and after analysis comparison Electric Pulse Treatment.This method can be such that laser direct forming beta-titanium alloy changes from columnar grain size to fine grain size and obtain verifying on the basis of high-efficient, at low cost.
Description
Technical field
The invention belongs to titanium alloy fields, and in particular to a kind of electric pulse regulation laser direct forming beta-titanium alloy crystal grain ruler
Very little experimental method.
Background technique
Since titanium alloy has high deformation temperature and resistance of deformation big, using traditional " forging+machining " method
Large titanium alloy structural member is manufactured, not only process is tediously long, complex process, but also removal amount is big, manufacturing cost is high when being machined.
Laser direct structuring technique is a kind of advanced manufacturing technology, can near-net-shape high-performance, compact structure metal parts, have
The outstanding features such as Non-mould shaping, manufacturing cost be low are very suitable to manufacture large titanium alloy structural member.
Studies have shown that β crystal grain is as small as possible in laser direct forming beta-titanium alloy tissue, and when being distributed as uniform as possible, property
It can be only achieved best.However during laser direct forming, laser molten pool heat input and heat loss condition be will affect
The formation of formation of parts interior tissue, while laser direct forming deposited tissue is largely coarse column crystal, the column
Crystalline substance not only reduces the mechanical property of laser direct forming beta-titanium alloy, also constrains laser direct structuring technique in beta-titanium alloy system
The application in field is made, thus, for laser direct forming beta-titanium alloy crystal grain, coarse column crystal group is made by aftertreatment technology
It knits to tiny crystal grain transformation, optimizing its mechanical property is particularly important.
For discussed above, some investigators optimize crystallite dimension using the methods of heat treatment and hot isostatic pressing, but
It is these method complex disposal process, low efficiency, and the high requirements on the equipment, at high cost.Therefore it needs to propose one kind in efficiency
On the basis of high, at low cost, regulate and control laser direct forming beta-titanium alloy crystallite dimension method, especially regulation laser directly at
The experimental method of type beta-titanium alloy crystallite dimension, to verify regulating effect.
Summary of the invention
The object of the present invention is to provide a kind of experiment sides of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension
Method, this method can make laser direct forming beta-titanium alloy from columnar grain size to tiny on the basis of high-efficient, at low cost
Crystallite dimension changes and obtains verifying, improves the comprehensive performance of laser direct forming beta-titanium alloy.
The technical scheme adopted by the invention is that:
A kind of experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension, comprising steps of 1) experiment is quasi-
Standby and process-is brilliant by the beta-titanium alloy that laser direct forming obtains cube, then processes the smooth cylindrical body of both ends of the surface
Titanium alloy sample, then polishing removal titanium alloy sample surface oxide layer, then by titanium alloy sample both ends of the surface respectively with
Two electrode of Electric Pulse Treatment equipment completely attaches to, and the electric current for then adjusting Electric Pulse Treatment equipment and action time are to titanium alloy sample
Product carry out Electric Pulse Treatment；2) titanium alloy sample after Electric Pulse Treatment is cut and is passed through with analysis-by the characterization of crystallite dimension
The embedding legal system of hot insert obtains metallographic specimen, aobvious using electron probe after metallographic specimen surface is polished, polishes, cleans and corroded
Grain size before micro mirror characterization corrosion utilizes sample crystallite dimension after metallographic microscope characterization corrosion, analysis comparison electricity
Sample crystallite dimension changes before and after the processing for pulse.
In step 1), the titanium alloy sample of the smooth cylindrical body of both ends of the surface is gone out by linear cutter.
In step 1), is polished by sand paper and remove the oxide layer on titanium alloy sample surface.
In step 2), the titanium alloy sample after Electric Pulse Treatment is by wire cutting along axial vertical profile.
In step 2), metallographic specimen is successively polished by sand paper from coarse to fine, is thrown by OPS polishing fluid
Light carries out alcohol washes by ultrasonic wave, carries out surface corrosion by corrosive liquid.
The beneficial effects of the present invention are:
This method on the basis of high-efficient, at low cost, can make laser direct forming beta-titanium alloy from columnar grain size to
Fine grain size changes and obtains verifying, improves the comprehensive performance of laser direct forming beta-titanium alloy.
Detailed description of the invention
Fig. 1 is the metallographic microscope (OM) that different electrical pulse times act on lower laser direct forming beta-titanium alloy crystallite dimension
Scheme (after corrosion), wherein a is untreated, b electrical pulse processing time 0.06s, c electrical pulse processing time 0.08s, black dotted lines frame
Represent small grains and subgrain region.
Fig. 2 is that the electron probe for the crystallite dimension that different electrical pulse times act on lower laser direct forming beta-titanium alloy is micro-
Mirror (EPMA) figure (corrode before sample middle position), wherein a is untreated, when b electrical pulse processing time 0.06s, c Electric Pulse Treatment
Between 0.08s, black dotted lines frame represents small grains and subgrain region.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
A kind of experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension, comprising steps of
1) Preparatory work of experiment and process；
Using Ti55531 powder as raw material, the beta-titanium alloy for obtaining cube by laser direct forming is brilliant, then
The titanium alloy sample (diameter 4.5mm, height 10mm) for going out the smooth cylindrical body of both ends of the surface by linear cutter, then passes through
The oxide layer on the sand paper polishing removal titanium alloy sample surface of 240#, then by titanium alloy sample both ends of the surface respectively and at electric pulse
It manages two electrode of equipment to completely attach to, the electric current and action time for then adjusting Electric Pulse Treatment equipment carry out electricity to titanium alloy sample
Pulse processing is marked to show difference the titanium alloy sample of different parameters processing: not carrying out the titanium alloy of Electric Pulse Treatment
Sample is labeled as No. 1, pulse current 70A used in sample 2, action time 0.06s, pulse current 70A used in sample 3, work
With time 0.08s.
2) characterization and analysis of crystallite dimension；
It is made by three titanium alloy samples after Electric Pulse Treatment by wire cutting along axial vertical profile and by the embedding method of hot insert
Metallographic specimen, metallographic specimen are successively polished by the sand paper of 240#, 600#, 1200#, 4000#, by OPS polishing fluid into
Row polishing carries out alcohol washes by ultrasonic wave, passes through HF, HNO3And H2The hybrid corrosion liquid of O carries out surface corrosion (stringent control
Etching time processed, titanium alloy sample is as shown in Figure 1 after corrosion) after, it is characterized using JXA-8530F electron probe microscope (EPMA)
Grain size before corrosion utilizes sample crystallite dimension after the corrosion of Olympus metallographic microscope (OM) characterization, analysis comparison
Sample crystallite dimension variation before and after Electric Pulse Treatment: as shown in Figure 1, it can be found that after Electric Pulse Treatment, the crystal grain of titanium alloy
Size is changed to small grains and subgrain (such as Fig. 1 b institute from the coarse columnar grain (as shown in Figure 1a) for running through cladding layer originally
Show), as shown in figure 1 shown in black dotted lines frame, and electrical pulse processing time is longer, and small grains and subgrain will be more (as schemed
Shown in 1c)；As shown in Figure 2.Analysis finds that after Electric Pulse Treatment, laser direct forming beta-titanium alloy crystallite dimension is by original
Coarse β column crystal (as shown in Figure 2 a) is changed into a certain number of small grains and subgrain (as shown in Figure 2 b), in Fig. 2
Shown in black dotted lines frame, when increasing the time of Electric Pulse Treatment, β column crystal can be further transformed to more small grains and Asia
Crystal grain, from crystal grain gray scale it is also seen that crystal grain, which is orientated, has occurred certain variation (as shown in Figure 2 c), the main reason is that because electricity
The energy that pulse is formed in a very short period of time concentrates the recrystallization for leading to crystal grain.
In summary, when Electric Pulse Treatment laser direct forming beta-titanium alloy, laser direct forming β can be made at room temperature
The crystallite dimension of titanium alloy is changed by coarse β column crystal orientation small grains and subgrain, and when electrical pulse processing time increases
When long, the orientation of crystal grain can also change, therefore, this method on the basis of high-efficient, at low cost, can make laser directly at
Type beta-titanium alloy changes from columnar grain size to fine grain size and obtains verifying, improves laser direct forming beta-titanium alloy
Comprehensive performance.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension, it is characterised in that: including step
Suddenly, the beta-titanium alloy that 1) Preparatory work of experiment and process-obtain cube by laser direct forming is brilliant, and it is flat then to process both ends of the surface
The titanium alloy sample of whole cylindrical body, then polishing removes the oxide layer on titanium alloy sample surface, then by titanium alloy sample two
End face is completely attached to two electrode of Electric Pulse Treatment equipment respectively, then adjusts electric current and the action time of Electric Pulse Treatment equipment
Electric Pulse Treatment is carried out to titanium alloy sample；2) characterization of crystallite dimension and analysis-are by the titanium alloy sample after Electric Pulse Treatment
It cuts and passes through the embedding legal system of hot insert and obtain metallographic specimen, after metallographic specimen surface is polished, polishes, cleans and corroded, utilize
Grain size before electron probe microscopic characterization corrosion, sample crystallite dimension after being corroded using metallographic microscope characterization,
Sample crystallite dimension variation before and after analysis comparison Electric Pulse Treatment.
2. the experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension as described in claim 1, feature
It is: in step 1), the titanium alloy sample of the smooth cylindrical body of both ends of the surface is gone out by linear cutter.
3. the experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension as described in claim 1, feature
It is: in step 1), is polished by sand paper and remove the oxide layer on titanium alloy sample surface.
4. the experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension as described in claim 1, feature
Be: in step 2), the titanium alloy sample after Electric Pulse Treatment is by wire cutting along axial vertical profile.
5. the experimental method of electric pulse regulation laser direct forming beta-titanium alloy crystallite dimension as described in claim 1, feature
Be: in step 2), metallographic specimen is successively polished by sand paper from coarse to fine, is polished by OPS polishing fluid,
Alcohol washes are carried out by ultrasonic wave, surface corrosion is carried out by corrosive liquid.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426325A (en) * | 2019-07-31 | 2019-11-08 | 武汉理工大学 | The method for carrying inert particle using micro-nano motor cluster |
| CN110954571A (en) * | 2019-12-13 | 2020-04-03 | 武汉理工大学 | Experimental method for rapidly improving hardness of titanium alloy at normal temperature |
| CN111060544A (en) * | 2019-12-10 | 2020-04-24 | 中国科学院金属研究所 | Preparation method of electron probe sample of Ti-Al alloy powder and microsegregation detection method |
| CN111366599A (en) * | 2020-04-20 | 2020-07-03 | 武汉理工大学 | Rapid nanocrystallization experimental method for titanium-based composite material reinforcement |
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| CN110954571A (en) * | 2019-12-13 | 2020-04-03 | 武汉理工大学 | Experimental method for rapidly improving hardness of titanium alloy at normal temperature |
| CN111366599A (en) * | 2020-04-20 | 2020-07-03 | 武汉理工大学 | Rapid nanocrystallization experimental method for titanium-based composite material reinforcement |
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