CN102618866B - Method for reinforcing laser cladding layer on surface of titanium alloy - Google Patents
Method for reinforcing laser cladding layer on surface of titanium alloy Download PDFInfo
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- CN102618866B CN102618866B CN 201210041114 CN201210041114A CN102618866B CN 102618866 B CN102618866 B CN 102618866B CN 201210041114 CN201210041114 CN 201210041114 CN 201210041114 A CN201210041114 A CN 201210041114A CN 102618866 B CN102618866 B CN 102618866B
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 83
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 title abstract 4
- 239000011248 coating agent Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011812 mixed powder Substances 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 34
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910021362 Ti-Al intermetallic compound Inorganic materials 0.000 claims abstract description 3
- 239000010936 titanium Substances 0.000 claims description 61
- 239000000758 substrate Substances 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 22
- 230000008018 melting Effects 0.000 claims description 22
- 235000011837 pasties Nutrition 0.000 claims description 13
- 229910000883 Ti6Al4V Inorganic materials 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- 238000007605 air drying Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 7
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 abstract 2
- 229910033181 TiB2 Inorganic materials 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 2
- 239000004115 Sodium Silicate Substances 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 abstract 1
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 37
- 238000005253 cladding Methods 0.000 description 25
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 238000009826 distribution Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 229910000765 intermetallic Inorganic materials 0.000 description 7
- 229910010165 TiCu Inorganic materials 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 238000012876 topography Methods 0.000 description 6
- 230000004580 weight loss Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910004349 Ti-Al Inorganic materials 0.000 description 4
- 229910004692 Ti—Al Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 229910010038 TiAl Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910015372 FeAl Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006023 eutectic alloy Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention discloses a method for reinforcing a laser cladding layer on a surface of a titanium alloy, which comprises the following steps that base powder is evenly mixed with mixed powder of C, TiB2 and Cu with a certain quantity proportion to form a paste shape by utilizing sodium silicate solution; the base powder is a Ti-Al intermetallic compound or Fe and Al mixed powder, the size of thebase powder is 20-30mum, and the size of the mixed powder of C, TiB2 and Cu is 20-30mum; the paste-shaped mixed powder is evenly coated on the surface of the titanium alloy, the thickness of a coating is 0.3-2mm, and the coating is naturally aired; laser beams are utilized to perform laser cladding on the surface of a titanium alloy sample pre-provided with the coating, and during the vertical scanning process of the laser beams, argon is laterally and coaxially blown to protect a molten pool and a lens barrel; and the process parameters are that laser power is 650-1500W, scanning speed is 2-11mm/s, light spot diameter is 2-9mm, and argon protection air pressure is 0.2-0.9MPa. The method for reinforcing the laser cladding layer on the surface of the titanium alloy can obtain a titanium alloy surface reinforcing coating layer with good abrasion resistance and a surface shape, and is convenient and simple in process, strong in adaptability and convenient to popularize and apply.
Description
Technical field
The present invention relates to a kind of method that strengthens the titanium alloy surface laser cladding layer, belong to the material surface strengthening technical field, particularly a kind ofly improve Ti-Al or Fe-Al intermetallic compound base TiB at titanium alloy surface with Cu
2The method of-C laser cladding layer tissue wear resistance and surface topography.
Background technology
Titanium alloy has high specific strength, and advantages such as high ratio modulus and excellent corrosion resistance have been widely used in fields such as aerospace.But titanium alloy surface wears no resistance, and has limited the performance of its potential.Laser melting and coating technique is significantly improved the physicochemical property that is repaired workpiece surface, has greatly prolonged the work-ing life of workpiece.It is the effective way that improves performances such as the wear-resisting and resistance to high temperature oxidation of titanium alloy surface that the laser melting coating ceramic particle strengthens compound coating, can make cladding layer and titanium alloy substrate produce metallurgical binding, and formation has the cladding layer of good obdurability.Can repair various inefficacy parts by laser melting and coating technique, as aero engine turbine blades etc.
The TiC ceramic hard has high hardness and wear resistance energy mutually.And that Ti-Al and Fe-Al intermetallic compound have simultaneously is high than strong, high ratio modulus, good abrasion resistance, creep resistance and good fatigue performance.TiC produces at the titanium alloy surface laser cladding layer can significantly improve the matrix surface wear resisting property.In preset coating, add The addition of C, the TiC strengthening phase is produced in laser cladding layer.In TiC reinforcement laser cladding layer, add a certain amount of boride and can suppress the generation of the dendritic crystalline substance of flourishing TiC in cladding layer, improve the toughness of laser cladding layer.In the laser cladding process, the molten bath produces in titanium alloy-based surface, the C in the preset coating can with the molten bath in Ti chemical reaction takes place, very easily generate excessive TiC hard phase, influence surface topography and the wear resisting property of laser cladding layer; And the C add-on is very few, produces mutually although can prevent excessive TiC hard, has reduced cladding layer hardness and wear resistance energy.Therefore, titanium alloy surface Ti-Al or Fe-Al intermetallic compound base TiB
2-C laser cladding layer has the unsettled defective of wear resisting property, and the present invention can significantly improve wear resistance and the surface topography of laser cladding layer.
The substrate powder that existing titanium alloy surface laser melting coating uses is Al
3Ti directly evenly stirs into the surface that pasty state is coated in titanium alloy with water glass solution, then carries out laser melting coating.Because of Al
3Had certain content Ti among the Ti, with Al
3Ti is easy to generate rich Ti molten bath as the molten bath of cladding substrate powder.Therefore, in laser cladding process, Al
3Ti is easy to the Ti that enters the molten bath by diluting effect chemical reaction to take place and generates Ti
3Al forms Ti
3The Al cladding layer can promote the wear resisting property of titanium alloy surface.Ti
3Al is a kind of α with the D019 superstructure
2The α of Xiang Weiji
2+ B two-phase intermetallic compound has density is low, specific tenacity is high, Young's modulus is high and excellent oxidation-resistance and corrosion resistance nature, is with a wide range of applications in the aerospace engine structure of a new generation.With respect to pure titanium, Ti
3The Al intermetallic compound has high elastic coefficient, good abrasion resistance, low density, high antioxidant and characteristic such as mechanical property preferably.In addition, Fe
3Al has good high temperature resistant, performance such as anti-oxidant and wear-resistant.At titanium alloy substrate surface laser cladding Al
3Ti can form Ti at matrix surface
3The Al intermetallic compounds layer, this cladding layer can significantly promote microhardness and the wear resisting property of titanium alloy surface.Metallograph shows, Ti
3Al cladding layer weave construction is even, and flawless and pore produce, and Fig. 1 has shown Ti
3The weave construction of Al laser cladding layer.
Adopt the hardness of HV-1000 type microhardness tester testing laser cladding layer, load is 200g, and the loading time is 5 seconds, inwardly measures a hardness value every 0.16mm from the sample top layer.Adopt the abrasion resistance of MM200 determination of wear testing machine alloying layer.Preferred dimension is the YG6 Wimet emery wheel of φ 40 * 12, rotating speed 400r/min, and load is 2～8kg.
Wear volume: measured polishing scratch width or wear weight loss in the wearing test every 10 minutes; The polishing scratch width adopts the volume measurement microscope, averages as measuring result through behind the multi-site determination.Utilize following formula proximate calculation to calculate wear volume.
In the formula: V is wear volume, and unit is mm
3
LThe 1st, polishing scratch length (being specimen width), the mm of unit;
B is the polishing scratch width, the mm of unit;
R is the emery wheel radius, the mm of unit.
Fig. 2 has shown Ti
3The Hardness Distribution of Al laser cladding layer, behind the laser melting coating, Ti
3Al laser cladding layer hardness can reach 600～700HV
0.2
Ti
3The Al laser cladding layer has higher hardness and mechanical property and weave construction preferably, and the wear volume of this cladding layer is 1/2nd of Ti-6Al-4V alloy substrate.Fig. 3 is Ti
3The wear volume curve of Al laser cladding layer and matrix, table 1 are Ti
3Al laser cladding layer wearing test result.
Table 1
Summary of the invention
The method of enhancing titanium alloy surface laser cladding layer of the present invention is at titanium alloy surface Ti-Al or Fe-Al intermetallic compound base TiB
2The unsettled defective of-C laser cladding layer surface topography and wear resisting property is eliminated crackle and appropriateness reduction fragility phase content in the cladding layer by the adding of Cu, thereby is improved cladding layer surface topography and wear resisting property.This technology can be applicable to airplane parts make in and all many-sides such as aviation field parts reparation.
Concrete steps of the present invention are as follows:
(1) with substrate powder and C, the TiB of certain mass ratio
2, the Cu mixed powder is with the even furnishing pasty state of water glass solution; Described substrate powder is Ti-Al intermetallic compound or Fe, Al mixed powder, size 20～300 μ m of substrate powder, C, TiB
2, Cu powder size 20～300 μ m.
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying.
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 650～1500W, sweep velocity 2～11mm/s, and spot diameter 2～9mm, argon shield air pressure are 0.2～0.9MPa.
As a further improvement on the present invention, before mixed powder applies, can clear up titanium alloy surface, and wipe away clean, dry up.
The modulus of the water glass solution in the described step (1) can be 2.2～3.7.
The described titanium alloy of step (2) can be the Ti-6Al-4V titanium alloy.
In the described mixed powder of step (1), each composition and massfraction thereof can be C5%-25%, TiB
210%-40%, Cu2%-15%, surplus is Al
3Ti.
In the described mixed powder of step (1), each composition and massfraction thereof can also be C5%-25%, TiB
210%-40%, Cu2%-15%, surplus is Fe, Al mixed powder, wherein the mass ratio of Al and Fe is between 1: 1 to 1: 2.
The present invention is as protecting under the gas condition specimen surface generation laser melting coating at argon gas.In laser cladding process, sample keeps original movement velocity constant.After the complete laser melting coating of specimen surface takes place, with laser shutdown, after two seconds shielding gas is closed.After close the protection gas reason be for make the protection gas specimen surface is protected fully.
The invention has the beneficial effects as follows, can obtain wear resistance and surface topography titanium alloy surface strengthened coat preferably.Advantages such as the present invention has technology simple and convenient, and suitability is strong, easy to utilize.
Description of drawings
Fig. 1 is Ti
3The weave construction of Al laser cladding layer;
Clad zone: cladding layer; Interface: interface; Crystal grain: crystal boundary.
Fig. 2 is Ti
3The Hardness Distribution of Al laser cladding layer;
Macro-hardness: microhardness; Distance from the surface: apart from the distance on surface.
Fig. 3 is Ti
3The wear volume curve of Al laser cladding layer and matrix;
Wear volume losses: wear weight loss; Time: time.
Fig. 4 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer X-ray diffractogram;
Relative intensity: relative intensity; Counts: counting; Degree: degree.
Fig. 5 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer the SEM pattern; SDU: Shandong University; SE (M) scanning electronic microscope.
Fig. 6 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer Hardness Distribution; Macro-hardness: microhardness; Distance from the surface: apart from the distance on surface.
Fig. 7 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, 5%Cu laser cladding layer and titanium alloy substrate the wear volume curve;
Wear volume losses: wear weight loss; Time: time.
Fig. 8 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, the 10%Cu laser cladding layer X-ray diffractogram;
Relative intensity: relative intensity; Counts: counting; Degree: degree.
Fig. 9 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, the 10%Cu laser cladding layer the SEM pattern;
SDU: Shandong University; SE (M) scanning electronic microscope.
Figure 10 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, 10%Cu laser cladding layer Hardness Distribution;
Macro-hardness: microhardness; Distance from the surface: apart from the distance on surface.
Figure 11 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, 10%Cu laser cladding layer and titanium alloy substrate the wear volume curve;
Wear volume losses: wear weight loss; Distance from the surface: apart from the distance on surface.
Figure 12 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer SEM pattern;
SDU: Shandong University; SE (M) scanning electronic microscope.
Figure 13 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer Hardness Distribution;
Macro-hardness: microhardness; Distance from the surface: apart from the distance on surface.
Figure 14 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer and titanium alloy substrate the wear volume curve;
Wear volume losses: wear weight loss; Time: time.
Figure 15 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, the 10%Cu laser cladding layer the SEM pattern;
SDU: Shandong University; SE (M) scanning electronic microscope.
Figure 16 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, the 10%Cu laser cladding layer Hardness Distribution;
Macro-hardness: microhardness; Distance from the surface: apart from the distance on surface.
Figure 17 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, 10%Cu laser cladding layer and matrix the wear volume curve;
Wear volume losses: wear weight loss; Time: time.
Embodiment
Embodiment 1:
The Ti-6Al-4V alloy is cut into the rectangular parallelepiped of length 30mm, width 10mm, thickness 10mm.Before mixed powder applies, the cleaning titanium alloy surface, and wipe away clean, dry up.Then, with massfraction be 70% Al
3Ti, massfraction are that 10% C, massfraction are 15% TiB
2, massfraction is that the mixed powder laser melting coating of 5%Cu is on its 30mm * 10mm face.
Concrete processing step is as follows:
(1) takes by weighing Al respectively
3Ti powdered alloy 0.70g, C powder 0.10g, TiB
2Powder 0.15g, Cu powder 0.05g pour load weighted powder in the small beaker into, are that 2.2～3.7 water glass solution evenly stirs into pasty state with this mixed powder with modulus.Size 20～300 μ m of substrate powder, C, TiB
2, Cu powder size 20～300 μ m.
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying.
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 900W, sweep velocity 5mm/s, and spot diameter 4mm, argon shield air pressure are 0.4MPa.
Fig. 4 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer X-ray diffractogram, according to the result of diffractogram as can be known, this laser cladding layer mainly comprises Ti
3Al, TiAl, TiB
2, TiB, TiC, Ti
3Cu, TiCu
2Al and Al
3Phases such as V.This result shows that in the laser cladding process, the matrix titanium alloy produces diluting effect to cladding layer, Al
3Ti with from the Ti that matrix enters the molten bath chemical reaction takes place by diluting effect, generate Ti
3Al or TiAl.The moiety of water glass is mainly Na
2OnSiO
2In laser cladding process, Si discharges from water glass, with the Ti in the cladding layer
3The Al reaction forms Ti
3The Al-Si eutectic structure.Fig. 5 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer the SEM pattern, show laser cladding layer tissue's even structure among the figure, flawless and pore produce.
Fig. 6 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, the 5%Cu laser cladding layer Hardness Distribution, behind the laser melting coating, this laser cladding layer is under hard and refined crystalline strengthening effect, specimen surface hardness can reach 1500～1600HV
0.2, promote 3～4 times than titanium alloy substrate.The adding of Cu makes CuTi
3With TiCu
2Al produces, and is conducive to the lifting of cladding layer hardness.
Because this laser cladding layer has higher hardness and mechanical property and weave construction preferably, the wear volume of this cladding layer is 1/3rd of Ti-6Al-4V alloy substrate.Fig. 7 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, 5%Cu laser cladding layer and titanium alloy substrate the wear volume curve, table 2 is that massfraction is 70%Al
3Ti, 10%C, 15%TiB
2, 5%Cu laser cladding layer and titanium alloy substrate wearing test result.
Table 2
Embodiment 2:
The Ti-6Al-4V alloy is cut into the rectangular parallelepiped of length 30mm, width 10mm, thickness 10mm.Before mixed powder applies, the cleaning titanium alloy surface, and wipe away clean, dry up.Then, be 65%Al with massfraction
3Ti, massfraction are that 10%C, massfraction are 15%TiB
2, massfraction is that 10%Cu mixed powder laser melting coating is on its 30mm * 10mm face.
Concrete processing step is as follows:
(1) takes by weighing Al respectively
3Ti powdered alloy 0.65g, C powder 0.10g, TiB
2Powder 0.15g, Cu powder 0.10g pour load weighted powder in the small beaker into, are that 2.2～3.7 water glass solution evenly stirs into pasty state with this mixed powder with modulus.Size 20～300 μ m of substrate powder, C, TiB
2, Cu powder size 20～300 μ m.
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying.
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 900W, sweep velocity 5mm/s, and spot diameter 4mm, argon shield air pressure are 0.4MPa.
Fig. 8 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, the 10%Cu laser cladding layer X-ray diffractogram, according to the XRD result of laser cladding layer as can be known, this laser cladding layer mainly comprises Ti
3Al, TiAl, TiB
2, TiB, TiC, Ti
3Cu, TiCu
2Al and Al
3Phases such as V.
Fig. 9 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, the 10%Cu laser cladding layer the SEM pattern, the SEM picture shows, this laser cladding layer tissue's even structure, flawless and pore produce.It is block and bar-shaped that the carbon boride precipitated phase is.TiCu
2The Al polycrystal is particulate state, and mainly along (200), (220), (311), (400) and (422) planar growth.
Behind the laser melting coating, under this laser cladding layer phase composite and refined crystalline strengthening effect, the hardness of cladding layer has raising.After Cu adds, TiB
2Fully fusing is conducive to the weave construction of refinement cladding layer, thereby promotes its hardness and wear resistance energy in the molten bath.Figure 10 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, 10%Cu laser cladding layer Hardness Distribution, cladding layer hardness can reach 1650～1800HV
0.2, promote 4～5 times than titanium alloy substrate.
This laser cladding layer has higher hardness and mechanical property and weave construction preferably, and the wear volume of cladding layer is 1/4th of Ti-6Al-4V alloy substrate.Figure 11 is that massfraction is 65%Al
3Ti, 10%C, 15%TiB
2, 10%Cu laser cladding layer and titanium alloy substrate the wear volume curve, table 3 is 65%Al for massfraction
3Ti, 10%C, 15%TiB
2, 10%Cu coating abrasion test-results.
Table 3
Embodiment 3:
The Ti-6Al-4V titanium alloy is cut into the rectangular parallelepiped of length 30mm, width 10mm, thickness 10mm.Before mixed powder applies, the cleaning titanium alloy surface, and wipe away clean, dry up.Then, be that 65% Fe, Al mixed powder, massfraction are that 15% C, massfraction are 15% TiB with massfraction
2, massfraction be the mixed powder laser melting coating of 5% Cu on its 30mm * 10mm face, wherein the mass ratio of Al and Fe is between 1: 1 to 1: 2.
Concrete processing step is as follows:
(1) takes by weighing Fe, Al mixed powder 0.65g, C powder 0.15g, TiB respectively
2Powder 0.15g, Cu powder 0.05g, wherein the mass ratio of Al and Fe is between 1: 1 to 1: 2.Load weighted powder is poured in the small beaker, is that 2.2～3.7 water glass solution evenly stirs into pasty state with this mixed powder with modulus.Size 20～300 μ m of substrate powder, C, TiB
2, Cu mixed powder size 20～300 μ m.
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying.
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 900W, sweep velocity 5mm/s, and spot diameter 4mm, argon shield air pressure are 0.4MPa.
This laser cladding layer mainly comprises Ti
3Al, FeAl, TiB
2, TiB, TiC, Ti
3Cu, TiCu
2Al, Al
3Phases such as V.Figure 12 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer SEM pattern, the SEM picture shows, this laser cladding layer tissue's even structure, flawless and pore produce.Block precipitated phase disperse is distributed in the laser cladding layer.And bar-shaped titanium boride is not too obvious, does not grow up.
Behind the laser melting coating, under hard and the refined crystalline strengthening effect, cladding layer hardness can reach 1450～1550HV in this laser cladding layer
0.2, being about 4～5 times of Ti-6Al-4V alloy substrate, Figure 13 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer Hardness Distribution.
This laser cladding layer has higher hardness and mechanical property and weave construction preferably, and the laser cladding layer wear volume is about 3～4 times of Ti-6Al-4V alloy.Figure 14 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu laser cladding layer and titanium alloy substrate the wear volume curve, table 4 is that massfraction is 65%Fe and Al, 15%C, 15%TiB
2, 5%Cu coating abrasion test-results.
Table 4
Embodiment 4:
The Ti-6Al-4V titanium alloy is cut into the rectangular parallelepiped of length 30mm, width 10mm, thickness 10mm.Before mixed powder applies, can clear up titanium alloy surface, and wipe away step clean, that dry up.Then, be 60% Fe, Al mixed powder with massfraction, massfraction is 15% C, massfraction is 15% TiB
2, massfraction be the mixed powder laser melting coating of 10% Cu on its 30mm * 10mm face, wherein the mass ratio of Al and Fe is between 1: 1 to 1: 2.
Concrete processing step is as follows:
(1) takes by weighing Fe, Al mixed powder 0.6g, C powder 0.15g, TiB respectively
2Powder 0.15g, Cu powder 0.05g, wherein the mass ratio of Al and Fe is between 1: 1 to 1: 2.Load weighted powder is poured in the small beaker, is that 2.2～3.7 water glass solution evenly stirs into pasty state with this mixed powder with modulus.Size 20～300 μ m of substrate powder, C, TiB
2, Cu mixed powder size 20～300 μ m.
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying.
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 900W, sweep velocity 2.5mm/s, and spot diameter 4mm, argon shield air pressure are 0.4MPa.
Figure 15 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, the 10%Cu laser cladding layer the SEM pattern; The SEM picture shows, this laser cladding layer tissue's even structure, and flawless and pore produce.Along with the increase of Cu content, boride be centered around the block precipitate of TiC around.
Figure 16 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, the 10%Cu laser cladding layer Hardness Distribution, behind the laser melting coating, under this laser cladding layer phase composite and refined crystalline strengthening effect, cladding layer hardness can reach 1450～1550HV
0.2FeAl, CuTi
3With TiCu
2Generation and the eutectic alloy of Al tie up to Al
3Ti-C-TiB
2The growth of-5Cu cladding layer also has the lifting that all is conducive to cladding layer hardness.
This laser cladding layer has higher hardness and mechanical property and weave construction preferably, and the wear volume of this cladding layer is the sixth of Ti-6Al-4V alloy substrate.Figure 17 is that massfraction is 60%Fe and Al, 15%C, 15%TiB
2, 10%Cu laser cladding layer and matrix the wear volume curve, table 5 is 60%Fe and Al, 15%C, 15%TiB
2, 10%Cu coating abrasion test-results.
Table 5
Claims (4)
1. method that strengthens the titanium alloy surface laser cladding layer may further comprise the steps:
(1) with substrate powder and C, the TiB of certain mass ratio
2, the Cu mixed powder is with the even furnishing pasty state of water glass solution; Described substrate powder is Ti-Al intermetallic compound or Fe, Al mixed powder, size 20～300 μ m of substrate powder, C, TiB
2, Cu mixed powder size 20～300 μ m;
(2) the pasty state mixed powder is coated in titanium alloy surface equably, the thickness of coating is 0.3～2mm, natural air drying;
(3) with laser beam the titanium alloy specimen surface of above-mentioned preset coating is carried out laser melting coating, coaxial argon shield molten bath and the lens barrel of blowing of side direction in the laser beam vertical sweep process; Processing parameter is laser power 650～1500W, sweep velocity 2～11mm/s, and spot diameter 2～9mm, argon shield air pressure are 0.2～0.9MPa;
In the described mixed powder of step (1), each composition and massfraction thereof are: C5%-25%, TiB
210%-40%, Cu2%-15%, surplus is Al
3Ti; Perhaps C5%-25%, TiB
210%-40%, Cu2%-15%, surplus is Fe, Al mixed powder, wherein the mass ratio of Al and Fe is that 1:1 is between the 1:2.
2. the method for enhancing titanium alloy surface laser cladding layer according to claim 1 is characterized in that, clears up titanium alloy surface before mixed powder applies, and wipe away clean, dry up.
3. the method for enhancing titanium alloy surface laser cladding layer according to claim 1 is characterized in that, the modulus of water glass solution is 2.2～3.7 in the described step (1).
4. the method for enhancing titanium alloy surface laser cladding layer according to claim 1 is characterized in that, the described titanium alloy of step (1) is the Ti-6Al-4V titanium alloy.
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