CN110508815A - A method of niti-shaped memorial alloy phase transition temperature is regulated and controled based on increasing material manufacturing - Google Patents
A method of niti-shaped memorial alloy phase transition temperature is regulated and controled based on increasing material manufacturing Download PDFInfo
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- 230000007704 transition Effects 0.000 title claims abstract description 75
- 239000000463 material Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 229910000905 alloy phase Inorganic materials 0.000 title claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 title abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 47
- 239000000956 alloy Substances 0.000 claims abstract description 47
- 238000010309 melting process Methods 0.000 claims abstract description 28
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 51
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 26
- 239000004615 ingredient Substances 0.000 claims description 17
- 230000009466 transformation Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 7
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000000844 transformation Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 description 40
- 239000010936 titanium Substances 0.000 description 14
- 238000007499 fusion processing Methods 0.000 description 7
- 238000000113 differential scanning calorimetry Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003446 memory effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B22F1/0007—
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/007—Alloys based on nickel or cobalt with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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Abstract
The present invention relates to a kind of methods based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature.In the method, increasing material manufacturing molding is carried out to niti-shaped memorial alloy using selective laser smelting technology, by selective laser melting process parameter during change increasing material manufacturing, to regulate and control the phase transition temperature of niti-shaped memorial alloy.Wherein, the range of selective laser melting process parameter are as follows: laser power 20W to 1000W, scanning speed 50mm/s to 6000mm/s, 5 μm to 300 μm of laser scanning pitch.By changing the one or more of above-mentioned technological parameter, the phase transition temperature of niti-shaped memorial alloy can be regulated and controled in certain temperature range.
Description
Technical field
The invention belongs to metal material field, material increasing field and marmem fields, more particularly to one kind
Method based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
NiTi (NiTi) marmem of near atomic ratio is presented with excellent shape memory effect and super-elasticity, is
Integrate the intellectual material of sensing with driving.Compared with traditional " sensor-driver " system, marmem
Using can greatly reduce cost, simplify structure, improve reliability, and can effectively reduce construction weight promoted using energy source
Efficiency.It is with a wide range of applications in fields such as aerospace, biologic medical, communications and transportation.
The functional characteristic that niti-shaped memorial alloy is shown is based on a kind of reversible thermoelasticityPhase transformation.For phase transition temperature to niti-shaped memorial alloy using most important, it decides that shape is remembered
Recall the temperature range that effect or super-elasticity occur.However, due to Nitinol phase transition temperature to ingredient and tissue change very
Sensitivity, so that regulation Nitinol phase transition temperature is extremely difficult.Theoretically, due to the phase transition temperature of Nitinol and its chemistry at
Point closely related (Frenzelet al., Acta Materialia, 2010,58:3444-3458), can pass through fine tuning NiTi
Alloying component, i.e. Ni:Ti atomic ratio in adjustment Nitinol, to regulate and control the phase transition temperature of Nitinol.However, since NiTi closes
The phase transition temperature of gold is very sensitive to composition transfer, for example, 0.1% (atomic fraction) of the every variation of the ingredient of Ni in Nitinol,
Phase transition temperature variation is difficult to the ingredient and phase transition temperature of accuracy controlling Nitinol using traditional Metallurgical Means up to 20 DEG C.
Ageing treatment is carried out for the Nitinol of rich Ni, Ni can be introduced in Nitinol4Ti3Secondary phase particle.Due to Ni4Ti3Two
Ni content is higher in phase particle, therefore with the precipitation of Secondary phase particle, and Ni content can gradually reduce in Nitinol matrix.It is theoretical
On, the ingredient of Nitinol matrix can be regulated and controled by adjusting aging treatment process (aging time and aging temp), in turn
Regulate and control the phase transition temperature of Nitinol.However, Ni4Ti3It, can be with Nitinol matrix when Secondary phase particle is precipitated in Nitinol
Keep symbiosis and epibiosis.Other than causing in Nitinol matrix Ni content to reduce, stress field and strain can be also introduced in the base
, cause the transformation behavior of Nitinol to become extremely complex, for example, there is three stages and multistage phase transformation (Wang et
al.,Functional Materials Letters,2017,10:1740004)。
Although due to the above problems, currently, industrially production Nitinol technology it is more mature, product
Two classes are broadly divided into, i.e., show as super-elasticity (rich Ni) in room temperature or show as shape memory effect (rich Ti) in room temperature.Mesh
Before, it there is no effective means that can regulate and control Nitinol phase transition temperature, make it that recovery of shape occur in specific temperature, seriously limit
The application prospect of niti-shaped memorial alloy.
Summary of the invention
In order to overcome the above problem, the present invention provides the sides that one kind can regulate and control niti-shaped memorial alloy phase transition temperature
Method.The present invention uses selective laser smelting technology, carries out laser gain material to niti-shaped memorial alloy powder material and is manufactured.Pass through
Change selective laser melting process parameter, to adjust the energy input during laser formation, and then influences laser formation process
The loss amount of middle Ni and Ti element regulates and controls the Nitinol ingredient of final molding, realizes to the effective of Nitinol phase transition temperature
Regulation.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A method of niti-shaped memorial alloy phase transition temperature is regulated and controled based on laser gain material manufacturing process, comprising:
Regulate and control the phase alternating temperature of the niti-shaped memorial alloy of final molding by changing laser gain material fabrication process parameters
Degree；
Wherein, the niti-shaped memorial alloy is the niti-shaped memorial alloy of laser gain material manufacture preparation.
In existing selective laser melting process, the adjustment to technological parameter is primarily to the forming of optimization material is imitated
Fruit improves consistency, to prepare the Nitinol with excellent mechanical performances.But it is chanced in the application research: for
Niti-shaped memorial alloy, can be by changing selective laser melting process parameter, to finely tune Nitinol ingredient, i.e., on a large scale
Ni:Ti atomic ratio, and then realize the Effective Regulation to Nitinol phase transition temperature.
In the application, refer on a large scale: laser energy density variation, maximum value is 3 times of minimum value.Wherein, energy is close
Degree=laser power ÷ (scanning speed × sweep span × powder thickness).
In some embodiments, the laser gain material manufacturing process is the powder bed smelting process based on laser, i.e. laser
Selective melting technique.The application is based on " can be by changing selective laser melting process parameter, to finely tune Nitinol on a large scale
The discovery of this rule of ingredient ", proposes a kind of new method of regulation Nitinol phase transition temperature, and regulation efficiency significantly improves.
In some embodiments, the laser gain material fabrication process parameters are laser power, in sweep span, scanning speed
One or more kinds of combinations.In current selective laser fusion process, each technological parameter adjusts simultaneously, cooperate difference；
In the application, a wide range of adjustment of laser power, sweep span or scanning speed can be kept not in another two parameter
It is carried out in the case where change, and then realizes the Effective Regulation to Nitinol phase transition temperature.
In some embodiments, the variation range of the selective laser melting process parameter are as follows: laser power 20W is extremely
1000W, scanning speed 50mm/s to 6000mm/s, 5 μm to 300 μm of laser scanning pitch.By changing selective laser smelter
Skill parameter, to finely tune the ingredient of laser gain material manufacture niti-shaped memorial alloy, i.e. Ni:Ti atomic ratio.
In some embodiments, selective laser melting process parameter variation range are as follows: selective laser melting process parameter becomes
Change range are as follows: laser power 60W to 200W, scanning speed 400mm/s to 1200mm/s, 40 μm to 110 μm of laser scanning pitch.
Nitinol ingredient, Effective Regulation Nitinol phase transition temperature are adjusted in micro- a small range.
In some embodiments, the raw material that the niti-shaped memorial alloy uses is 15 μm to 53 μm for particle size range
Niti-shaped memorial alloy spherical powder improves the melting efficiency of powder and the mechanical property of material；
Preferably, the niti-shaped memorial alloy spherical powder is NiTi binary shape memorial alloy, wherein nickel content
For 52.5% to 50% (atomic fraction), change the Ni content in material by way of laser scaling loss, and then regulates and controls its phase
Temperature.
In some embodiments, the phase transition temperature refers to that niti-shaped memorial alloy is changed into martensite from austenite
(cooling procedure), and phase transition temperature (heating process) corresponding to austenite is returned from martensite transfor mation.
In some embodiments, by changing selective laser melting process parameter, to finely tune laser gain material manufacture NiTi shape
The ingredient of shape memory alloys, i.e. Ni:Ti atomic ratio.With using the phase transition temperature of niti-shaped memorial alloy, to ingredient, (Ni:Ti is former
Sub- ratio) the very sensitive characteristic of variation, realize the Effective Regulation to Nitinol phase transition temperature.
The present invention also provides above-mentioned niti-shaped memorial alloy components in aerospace, medical instrument, mechanical electric apparatus
The application in field.
The beneficial effects of the present invention are:
(1) phase transition temperature of niti-shaped memorial alloy changes ingredient (Ni:Ti atomic ratio) very sensitive.For example, nickel
0.1% (atomic fraction) of the every variation of the ingredient of Ni in titanium alloy, phase transition temperature variation is up to 20 DEG C.It is difficult using conventional metallurgical means
To adjust Nitinol ingredient in micro- a small range, it is unable to Effective Regulation Nitinol phase transition temperature.Tune provided by the present invention
The method for controlling niti-shaped memorial alloy phase transition temperature can be come micro- by changing selective laser melting process parameter on a large scale
Nitinol ingredient, i.e. Ni:Ti atomic ratio are adjusted, and then realizes the Effective Regulation to Nitinol phase transition temperature.
(2) method of regulation niti-shaped memorial alloy phase transition temperature provided by the present invention, can be by increasing in laser
In material manufacturing process, change precinct laser fusion technological parameter, there are the different parts of niti-shaped memorial alloy component not
Same phase transition temperature.
(3) operating method of the application is simple, regulation is accurate, practical, is easy to large-scale production.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is embodiment 1 by the laser power in change selective laser melting process parameter, and preparation has different phases
The niti-shaped memorial alloy of temperature.Wherein (a) is to test obtained each sample using differential scanning calorimetric analysis instrument (DSC)
Transformation curve；Wherein, with phase transformation Tm peak value be followed successively by from low to high 60W, 80W, 100W, 120W, 140W, 160W, 180W,
200W.It (b) is selective laser fusing forming niti-shaped memorial alloy phase transition temperature with the relationship of laser power variation.
Fig. 2 is that embodiment 2 has not by changing the laser scanning speed in selective laser melting process parameter, preparation
With the niti-shaped memorial alloy of phase transition temperature.Wherein (a) is each to be obtained using differential scanning calorimetric analysis instrument (DSC) test
The transformation curve of sample, wherein as laser scanning speed is followed successively by 1200mm/s, 1000mm/ to phase transformation Tm peak value from low to high
s,900mm/s,800mm/s,700mm/s,600mm/s,500mm/s,400mm/s；It (b) is selective laser fusing forming NiTi shape
The relationship that shape memory alloys phase transition temperature changes with laser scanning speed.
Fig. 3 is that embodiment 3 has not by changing the laser scanning pitch in selective laser melting process parameter, preparation
With the niti-shaped memorial alloy of phase transition temperature.Wherein (a) is each to be obtained using differential scanning calorimetric analysis instrument (DSC) test
The transformation curve of sample, wherein with phase transformation Tm peak value from low to high laser scanning pitch be followed successively by 110 μm, 100 μm, 90 μm,
80μm,70μm,60μm,50μm,40μm；It (b) is selective laser fusing forming niti-shaped memorial alloy phase transition temperature with laser
The relationship of sweep span variation.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used in this application have logical with the application person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, Effective Regulation NiTi is difficult to using traditional Metallurgical Means or heat treatment method
The phase transition temperature of marmem.The invention proposes one kind to regulate and control Nitinol phase alternating temperature based on laser gain material manufacturing process
The method of degree.By changing selective laser melting process parameter, to adjust the Ni:Ti atomic ratio in niti-shaped memorial alloy,
And then realization is to the Effective Regulation of Nitinol phase transition temperature.
The object of the present invention is to provide one kind to regulate and control niti-shaped memorial alloy phase alternating temperature based on laser gain material manufacturing process
The method of degree.
For achieving the above object, specifically, the invention discloses following technical proposals:
The invention discloses a kind of sides based on laser gain material manufacturing technology regulation niti-shaped memorial alloy phase transition temperature
Method.Firstly, carrying out rapid melting/coagulation forming to niti-shaped memorial alloy dusty material using laser gain material manufacturing process；
Then, regulate and control the phase transition temperature of niti-shaped memorial alloy by changing laser gain material fabrication process parameters.
Further, the side based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, wherein laser gain material manufacture use the powder bed smelting process based on laser, i.e. selective laser melting process.
Further, the side based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, wherein the variable parameter of precinct laser fusion technique is chosen: laser power, scanning speed, sweep span therein one
Kind is a variety of.
Further, the side based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, the wherein range of selective laser melting process Parameters variation are as follows: laser power 20W to 1000W, scanning speed 50mm/s is extremely
6000mm/s, 5 μm to 300 μm of laser scanning pitch.
Preferably, selective laser melting process parameter variation range are as follows: laser power 60W to 200W, scanning speed
400mm/s to 1200mm/s, 40 μm to 110 μm of laser scanning pitch.
In the fusion process of selective laser, the range of powder thickness is 30 μm to 60 μm, chooses wherein certain value, and
It is remained unchanged in the fusion process of selective laser.
Preferably, other conditions include: laser spot diameter less than 100 μm in the fusion process of selective laser, forming process
Middle molding warehouse oxygen content is less than 500ppm, and the protective gas in forming process is argon gas or helium.
Further, the side based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, the material of selection are the NiTi binary shape memorial alloy dusty material of near atomic ratio.Wherein nickel content scope is 50%
To 52.5% (atomic fraction).The raw material of niti-shaped memorial alloy be spherical powder material, wherein particle size range be 10 μm extremely
150μm。
Preferably, the particle size range of Nitinol spherical powder be 15 μm to 53 μm, nickel content scope be 50.5% to
51% (atomic fraction).
Further, the side based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, basic principle are as follows: laser gain material is carried out to niti-shaped memorial alloy powder material and is manufactured.It is molten by changing selective laser
Change technological parameter, to adjust the energy input during laser formation, and then Ni and Ti element during influence laser formation
Loss amount regulates and controls the Nitinol ingredient of final molding, realizes the Effective Regulation to Nitinol phase transition temperature.
With reference to the accompanying drawing and specific embodiment the present invention is described further.
Embodiment 1:
A kind of example that regulation niti-shaped memorial alloy phase transition temperature is manufactured based on laser gain material.Use Ni content for
The niti-shaped memorial alloy spherical powder of 51% (atomic fraction), powder diameter range are 15 μm to 53 μm.It is selected using laser
Area's melting process carries out laser processing molding to above-mentioned spherical powder.
Selective laser melting process parameter are as follows: laser power is stepped up to 200W from 60W, and laser scanning speed is
600mm/s is remained unchanged, and laser scanning pitch is 80 μm and remains unchanged, and powder powdering thickness is 30 μm and remains unchanged, laser light
Spot diameter is 60 μm.Guarantee that the oxygen content in molding cavity is not higher than 500ppm in the fusion process of selective laser.
As shown in Figure 1, with laser power from 60W increase 200W, the phase transition temperature of niti-shaped memorial alloy gradually from-
8 DEG C are increased to 12 DEG C.Here phase transition temperature refers to austenite → martensite transfor mation peak temperature in cooling procedure.
The above results show the increase with laser power, and the phase transition temperature dullness of niti-shaped memorial alloy increases, then
The phase transition temperature of Nitinol can be regulated and controled by control laser power.
Embodiment 2:
A kind of example that regulation niti-shaped memorial alloy phase transition temperature is manufactured based on laser gain material.Use Ni content for
The niti-shaped memorial alloy spherical powder of 51% (atomic fraction), powder diameter range are 15 μm to 53 μm.It is selected using laser
Area's melting process carries out laser processing molding to above-mentioned spherical powder.
Selective laser melting process parameter are as follows: laser power keep 120W it is constant, laser scanning speed from 400mm/s gradually
It is increased to 1200mm/s, laser scanning pitch is 80 μm and remains unchanged that powder powdering thickness is 30 μm and remains unchanged, laser facula
Diameter is 60 μm.Guarantee that the oxygen content in molding cavity is not higher than 500ppm in the fusion process of selective laser.
As shown in Fig. 2, as laser scanning speed from 400mm/s increases to 1200mm/s, niti-shaped memorial alloy
Phase transition temperature is gradually reduced to -11 DEG C from 21 DEG C.Here phase transition temperature refers to austenite → martensite in cooling procedure
The peak temperature of transformation.
The above results show the increase with laser scanning speed, the phase transition temperature dullness drop of niti-shaped memorial alloy
It is low, then it can regulate and control the phase transition temperature of Nitinol by control laser scanning speed.
Embodiment 3:
A kind of example that regulation niti-shaped memorial alloy phase transition temperature is manufactured based on laser gain material.Use Ni content for
The niti-shaped memorial alloy spherical powder of 51% (atomic fraction), powder diameter range are 15 μm to 53 μm.It is selected using laser
Area's melting process carries out laser processing molding to above-mentioned spherical powder.
Selective laser melting process parameter are as follows: laser power keeps 120W constant, and laser scanning speed keeps 800mm/s not
Become, laser scanning pitch is stepped up to 80 μm from 40 μm, and powder powdering thickness is 30 μm and remains unchanged that laser spot diameter is
60μm.Guarantee that the oxygen content in molding cavity is not higher than 500ppm in the fusion process of selective laser.
As shown in figure 3, as laser scanning pitch increases to 120 μm from 40 μm, the phase alternating temperature of niti-shaped memorial alloy
Degree is gradually reduced to -5 DEG C from 17 DEG C.Here phase transition temperature refers to austenite → martensite transfor mation peak in cooling procedure
It is worth temperature.
The above results show the increase with laser scanning pitch, the phase transition temperature dullness drop of niti-shaped memorial alloy
It is low, then it can regulate and control the phase transition temperature of Nitinol by control laser scanning pitch.
Finally it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not limited to this hair
It is bright, although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still
It can modify to technical solution documented by previous embodiment, or part is equivalently replaced.It is all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to the scope of the present invention
Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not required to
Make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (9)
1. a kind of method based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature, which is characterized in that
Include:
Regulate and control the phase transition temperature of the niti-shaped memorial alloy of final molding by changing laser gain material fabrication process parameters；
Wherein, the niti-shaped memorial alloy is the niti-shaped memorial alloy of laser gain material manufacture preparation.
2. the side as described in claim 1 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the laser gain material manufacturing process is the powder bed smelting process based on laser, i.e. selective laser smelter
Skill.
3. the side as described in claim 1 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the laser gain material fabrication process parameters be one of laser power, sweep span, scanning speed or
Person's multiple combinations.
4. the side as claimed in claim 2 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the variation range of the selective laser melting process parameter are as follows: laser power 20W to 1000W, scanning
Speed 50mm/s to 6000mm/s, 5 μm to 300 μm of laser scanning pitch.
5. the side as claimed in claim 4 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the selective laser melting process parameter variation range of optimization are as follows: selective laser melting process Parameters variation model
It encloses are as follows: laser power 60W to 200W, scanning speed 400mm/s to 1200mm/s, 40 μm to 110 μm of laser scanning pitch.
6. the side as claimed in claim 4 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the NiTi shape that the raw material that the niti-shaped memorial alloy uses is 15 μm to 53 μm for particle size range
Memorial alloy spherical powder；
Preferably, the niti-shaped memorial alloy spherical powder is NiTi binary shape memorial alloy, and wherein nickel content is original
Subfraction 52.5% to 50%.
7. the side as claimed in claim 4 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that the phase transition temperature refers to that niti-shaped memorial alloy is changed into martensite from austenite --- it is cooled
Journey, and phase transition temperature --- heating process corresponding to austenite is returned from martensite transfor mation.
8. the side as claimed in claim 4 based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature
Method, which is characterized in that by changing selective laser melting process parameter, to finely tune laser gain material manufacture niti-shaped memorial alloy
Ingredient, i.e. Ni:Ti atomic ratio.
9. the method based on laser gain material manufacturing process regulation niti-shaped memorial alloy phase transition temperature described in claim 1-8
In aerospace, the application of medical instrument, mechanical electric apparatus field.
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