CN104988493A - Method for achieving nanocrystallization of titanium alloy laser deposition layer through nanocrystallization factors - Google Patents
Method for achieving nanocrystallization of titanium alloy laser deposition layer through nanocrystallization factors Download PDFInfo
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- CN104988493A CN104988493A CN201510279059.3A CN201510279059A CN104988493A CN 104988493 A CN104988493 A CN 104988493A CN 201510279059 A CN201510279059 A CN 201510279059A CN 104988493 A CN104988493 A CN 104988493A
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Abstract
The invention discloses a method for preparing a nanocrystallization laser melting deposition composite material by means of a chemical method. The method comprises the following steps that Stellite 21 base powder, TiC and Zn-SiC mixed powder are uniformly mixed to be pasty by means of water glass according to a certain mass ratio, wherein the size of Stellite 21 ranges from 1 micrometer to 220 micrometers, the size of the TiC ranges from 1 micrometer to 180 micrometers, the Zn-SiC is nanocrystallization factors, and the size of the Zn-SiC ranges from 10 micrometers to 220 micrometers; the surface of titanium alloy is uniformly coated with the pasty mixed powder, the layer thickness ranges from 0.1 mm to 2.6 mm, and natural drying is performed; and laser beams are used for conducting laser treatment on the surface of a titanium alloy sample. According to the technological parameters, the laser power ranges from 260 W to 4100 W, the scanning speed ranges from 0.5 mm/s to 25 mm/s, the diameter of light spots ranges from 0.5 mm to 8 mm, and the argon shield air pressure ranges from 0.1 MPa to 1.2 MPa. The nanocrystallization laser melting deposition layer with the obviously-improved wear resistance can be obtained through the method.
Description
Technical field
The present invention relates to a kind of method realizing titanium alloy surface Laser Melting Deposition layer nanometer, belong to material surface strengthening technical field.Under ar gas environment, the method for titanium alloy substrate surface Stellite 21 base Laser Melting Deposition layer nanometer is made in particular to a kind of Zn-SiC of utilization nanometer factor.
Background technology
Titanium alloy has high ratio modulus, height than advantages such as strong and excellent corrosion resistances, is widely used in the essential industry fields such as aerospace.The nano particle produced in Laser Melting Deposition layer because of its special structure and dimensional effect, and have general material be difficult to obtain excellent properties, as high-wearing feature and high-temperature oxidation etc.Stellite 21 powder is a kind of nickel chromium triangle boron-silicon-Fe powdered alloy of high rigidity, the characteristic such as have self-fluxing nature and the excellent and fusing point of wettability is lower, and its Laser Melting Deposition layer has high, the high feature such as anti-corrosion, wear-resisting and heat-resisting of hardness; Appropriate ceramic phase adds the hardness and wear resistance energy that can significantly improve Ni60A base Laser Melting Deposition layer.Ni and the γ-Fe comprised due to Stellite 21 powder is all centroid cubic lattice structure, can infinitely dissolve each other; Preferential and the γ-Fe of Ni forms sosoloid nucleus, nucleus constantly absorbs a large amount of Ni atom and grows up from the molten bath being in molten state, and a large amount of Ni element is assembled, and forms the netted γ of rich Ni-(Fe in fusion area, Ni) austenite phase, is beneficial to the plasticity and toughness promoting settled layer.Stellite alloy, namely usually said CoCrW (Mo) alloy or cobalt base alloy are a kind of Wimet of wear-resistant and resistance to high temperature oxidation.Added by appropriate Stellite in Laser Melting Deposition layer, this layer will have high rigidity, the plurality of advantages such as corrosion-resistant, wear-resisting and heat-resisting.Zn, to the nanometer process of Stellite base laser deposition layer, is utilize Zn to generate such as Co at laser molten pool situ
5zn
21and the nano particle such as CoCr greatly suppresses other Crystallization Phases growth process, is also the process of a large amount of nanocrystalline generation, such is nanocrystalline has high diffusivity in high temperature molten bath, easily causes lattice distortion, makes laser deposition layer generation aSi∶H film; SiC ceramic produces mutually can the netted eutectic structure of remarkable refining laser settled layer grain boundaries.
Because in melt deposition process, each position, molten bath is heated uneven, many tiny ceramic phases fully cannot melt and become the forming core point of crystal structure, are beneficial to refinement layer tissue.In Laser Melting Deposition process, there is the non-metallic element of little atomic radius in a large number, the diluting effect of procatarxis melt deposition powder smelting as first in Si, C etc. or base material and enter molten bath, add the stacking density of atom, be beneficial to the stability strengthening supercooled liquid phase, impel amorphous phase to produce in layer.Because molten bath that laser radiation produces has chilling characteristic, therefore amorphous phase production process is beneficial to nanocrystalline generation; In addition, in Laser Melting Deposition process, because base material is to the diluting effect in molten bath, a large amount of Al, Ti, Mo, V, Zr element enters molten bath by base material, significantly can improve the wear resistance of layer.Mo, Zr, V all belong to carbide, and the carbide generated in melt deposition process is stablized and not easily grown up, and particle is tiny, can effectively stop crystal boundary to move and thinning microstructure structure.
Based on above-mentioned the principles of science, the present invention proposes one can reduce production cost, makes the treatment process of titanium alloy Laser Melting Deposition layer nanometer.The fore-put powder that existing titanium alloy surface laser treatment uses is Stellite 21-TiC-Zn-SiC, directly becomes pasty state to be coated on titanium alloy surface with water glass solution uniform stirring, then carries out Laser Melting Deposition; Stellite 21 has extremely strong glass forming ability, and Co and Ni element enters molten bath and is beneficial to amorphous phase generation.
Stereoscan photograph shows, the uniform texture of the Stellite 21-TiC-Zn-SiC Laser Melting Deposition layer produced under ar gas environment, and flawless and pore produce (see Fig. 1 a); Fig. 1 b is depicted as a large amount of nanometer granule-morphologies expedited the emergence of out in settled layer under the effect of the nanometer factor.The object that Zn-SiC adds Laser Melting Deposition layer to is for being made settled layer be nanometer structure by chemical reaction, thus reaches the object promoting titanium alloy surface wearability.
Adopt the abrasion resistance of MM200 determination of wear testing machine gradient composites.Preferred dimension is
Φthe YG6 Wimet emery wheel of 40 × 12, rotating speed 400 r/min, load is 5 kg.Fig. 2 shows the abrasion loss of the Stellite 21-TiC-Zn-SiC Laser Melting Deposition layer produced in ar gas environment, and the abrasion loss of this settled layer is about 1/15 of titanium alloy base material, for not adding 1/2 of Zn-SiC nanometer factor Laser Melting Deposition layer.
Summary of the invention
The present invention by the introducing induction titanium alloy Laser Melting Deposition layer nanometer of the Zn-SiC nanometer factor, thus improves its surface topography and promotes titanium alloy surface wear resistance.This technology can be applicable to all many-sides such as metallic element manufacture.
Concrete steps:
(1) by certain mass ratio Stellite 21(1 ~ 220 μm), TiC(1 ~ 180 μm), the even furnishing pasty state of Zn-SiC(10 ~ 220 μm mixed powder water glass solution;
(2) by pasty state mixed powder even application in titanium alloy surface, layer thickness 0.1 ~ 2.6 mm, natural air drying;
(3) carry out Laser Melting Deposition with laser beam to the specimen surface of above-mentioned initialization layer, in laser beam vertical sweep process, side direction coaxially blows argon shield molten bath and lens barrel.Processing parameter: laser power 260 ~ 4100 W, sweep velocity 0.5 ~ 25 mm/s, spot diameter 0.5 ~ 8 mm, argon shield air pressure 0.1 ~ 1.2 MPa.The present invention can obtain the titanium alloy surface Laser Melting Deposition nanometer layer that microhardness significantly improves.
Can titanium alloy surface be cleared up before mixed powder coating, and wipe clean, dry up.
The modulus of the water glass solution in described step (1) is 1.2 ~ 5.4.
Step (2) described titanium alloy can be TA15 TC17 TC4 the TA2 trade mark.
In step (2) described mixed powder, each composition and massfraction thereof: TiC3%-38%, Zn1%-12%, SiC8%-16%, surplus Stellite 21.The wherein nominal chemical composition of Stellite 21: C0.25, Cr27.00, Si1.00, W0.15, Fe2.00, Mo5.50, Ni3.00, Mn1.00, remaining is Co.
The present invention is under argon shield gas condition in Laser Melting Deposition process, and sample keeps original movement velocity constant.After the complete Laser Melting Deposition of specimen surface, by laser shutdown, after two seconds, shielding gas is closed.Rear object of closing protection gas is for adequately protecting to specimen surface.
The present invention can obtain wear resistance and surface topography good titanium alloy laser nano layer.There are the advantages such as technique is simple and convenient, suitability is strong, easy to utilize.
Accompanying drawing explanation
fig. 1it is macroscopical SEM picture (a) of Stellite 21-TiC-Zn-SiC Laser Melting Deposition layer; Microcosmic nano particle picture (b).
fig. 2the wear volume figure of Stellite 21-TiC-Zn-SiC in ar gas environment, Stellite 21-TiC Laser Melting Deposition layer and TC17 titanium alloy.
Embodiment
embodiment 1:
TC17 alloy is cut into the square of length 10 mm, width 35 mm, thickness 10 mm.Before mixed powder coating, cleaning titanium alloy surface, and wipe clean, dry up.Then by the mixed powder Laser Melting Deposition of massfraction 77%Stellite 21,10%TiC, 3%Zn, 10%SiC on its mm face, 10 mm × 35.
Concrete technology step:
(1) before laser deposition, treat laser processing surface with No. 120 sand papering TC17 titanium alloys, make its surfaceness reach Ra 2.5 μm; Then treat laser processing surface with volume percent 25% aqueous sulfuric acid to clean, pickling time 5 ~ 10 min; After pickling, with clear water rinse, with alcohol by workpiece surface wiped clean fusion, dry up;
(2) configure the water glass solution of 20 ml with glass test tube, the pure water glass in this water glass solution and the volume allocation ratio of water are 1:3, namely measure the pure water glass of 5 ml and the water of 15 ml, stir in glass test tube;
(3) on balance, take Stellite 21 alloy powder 0.77 g, TiC powder 0.10g, Zn powder 0.03g respectively, SiC powder 0.10g, load weighted powder is poured in small beaker, with the water glass solution of modulus 1.1 ~ 3.6, this mixed powder uniform stirring is become pasty state.Stellite 21 base powder size 50 ~ 100 μm, TiC, Zn, SiC powder size 40 μm ~ 110 μm;
(4) pasty state mixed powder is coated on titanium alloy surface equably, thickness 0.7 mm, natural air drying;
(5) with laser beam, laser deposition process is carried out to the specimen surface in above-mentioned Glass Containers; Processing parameter: laser power 800W, sweep velocity 6 mm/s, spot diameter 4 mm, argon shield air pressure 0.4 MPa;
(6) sample is positioned over the position facing Laser emission mouth.After position is adjusted, with the spanner of adjusting sample position parallel on laser apparatus, sample and laser apparatus emission port are pulled open certain distance, then allow sample to laser spout with 6 mm/s speed uniform motion.When sample will move to Laser emission mouth, open laser transmitter in advance, specimen surface generation Laser Melting Deposition.After the complete Laser Melting Deposition of specimen surface, by laser shutdown, after two seconds, shielding gas is closed.After laser treatment completes, the wear volume of Stellite 21-TiC-Zn-SiC Laser Melting Deposition layer is about 1/16 of TC17 base material.
Claims (2)
1. the method for titanium alloy Laser Melting Deposition layer nanometer under nanometer factor effect:
(1) by certain mass ratio Stellite 21-TiC-Zn-SiC mixed powder water glass solution (Na
2onSiO
2) even furnishing pasty state; Described Stellite 21 powder size 1 ~ 220 μm, TiC powder size 1 ~ 180 μm, Zn-SiC powder size 10 ~ 220 μm; After pasty state mixed powder is coated in equably TA15 TC17 TC4 TA2 trade mark titanium alloy surface, natural air drying;
(2) pasty state mixed powder is coated in equably TA15 TC17 TC4 TA2 titanium alloy surface, thickness 0.1 ~ 2.6 mm;
(3) carry out Laser Melting Deposition with laser beam to above-mentioned titanium alloy specimen surface, in laser beam vertical sweep process, side direction coaxially blows argon shield molten bath and lens barrel; Processing parameter: laser power 260 ~ 4100 W, sweep velocity 0.5 ~ 25 mm/s, spot diameter 0.5 ~ 8 mm, argon shield air pressure 0.1 ~ 1.2 MPa.
2. according to claim 1 make TA15 TC17 TC4 the method for TA2 titanium alloy Laser Melting Deposition layer nanometer, it is characterized in that, in the mixed powder described in step (1), each composition quality mark: TiC3%-38%, Zn1%-12%, SiC8%-16%, surplus Stellite 21.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110202147A (en) * | 2019-07-02 | 2019-09-06 | 山东建筑大学 | A method of amorphous buffer gradient composites are prepared by Laser Melting Deposition |
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| CN102618740A (en) * | 2011-12-27 | 2012-08-01 | 中国科学院苏州纳米技术与纳米仿生研究所 | Silicon carbide reinforced aluminum-based composite material and its preparation method |
| WO2013042635A1 (en) * | 2011-09-20 | 2013-03-28 | 日本発條株式会社 | Laminate and laminate manufacturing method |
| CN104087866A (en) * | 2014-07-31 | 2014-10-08 | 宁国市宁武耐磨材料有限公司 | High-heat-resistant and wear-resistant ball for ball mill |
| CN104561996A (en) * | 2015-01-17 | 2015-04-29 | 山东建筑大学 | Method for superfine nanocrystallization of laser cladding coating on surface of titanium alloy in ice environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013042635A1 (en) * | 2011-09-20 | 2013-03-28 | 日本発條株式会社 | Laminate and laminate manufacturing method |
| CN102618740A (en) * | 2011-12-27 | 2012-08-01 | 中国科学院苏州纳米技术与纳米仿生研究所 | Silicon carbide reinforced aluminum-based composite material and its preparation method |
| CN104087866A (en) * | 2014-07-31 | 2014-10-08 | 宁国市宁武耐磨材料有限公司 | High-heat-resistant and wear-resistant ball for ball mill |
| CN104561996A (en) * | 2015-01-17 | 2015-04-29 | 山东建筑大学 | Method for superfine nanocrystallization of laser cladding coating on surface of titanium alloy in ice environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110202147A (en) * | 2019-07-02 | 2019-09-06 | 山东建筑大学 | A method of amorphous buffer gradient composites are prepared by Laser Melting Deposition |
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Application publication date: 20151021 |