CN105154871B - The laser manufacture method of TiAl-base alloy gradient fire proofing is prepared on titanium alloy - Google Patents
The laser manufacture method of TiAl-base alloy gradient fire proofing is prepared on titanium alloy Download PDFInfo
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Abstract
The invention belongs to technical field of laser processing, is related to a kind of laser manufacture method that TiAl base intermetallic compound gradient fire proofings are prepared on titanium alloy material, is mainly used in the preparation of titanium alloy surface flame-retardant layer, improves the flame-retarding characteristic of titanium alloy.From TiAl base intermetallic compound of the flame-retarding characteristic better than TC4 titanium alloys as flame-retardant layer, using laser melting and coating process, gradient fire proofing is prepared on TC4 titanium alloys.The flame-retardant layer of preparation is combined very well with TC4 matrixes, and surface flawless defect, after tested, fire resistance are substantially better than TC4 titanium alloys.
Description
Technical field
The invention belongs to technical field of laser processing, is related to one kind and chemical combination between TiAl Base Metals is prepared on titanium alloy material
The laser manufacture method of thing gradient fire proofing, it is mainly used in the preparation of titanium alloy surface flame-retardant layer, improves the fire-retardant of titanium alloy
Characteristic.
Background technology
Titanium alloy product occurs titanium fire and inclined in requirement that advanced aero engine of new generation improves to thrust-weight ratio and compressor
To the contradiction between increase, an urgent demand is proposed to the new type high temperature titanium alloy material of resistance to higher temperature and resistance burning.Hair
Motivation titanium fire is that a kind of typical engine forces firing accident, and high energy friction or load impacting between blade and casing etc. are
Main ignition source.
Based on case above, German MTU aero-engines company tests TiAl, Ti3The burning speed of Al and TC4 titanium alloys
Rate, draw TiAl-base alloy be used for turbogenerator can prevent titanium fire occur, and the operating temperature of the alloy up to 600 DEG C very
To 800 DEG C, there is good application prospect in the high-pressure compressor in future.According to the characteristic of TiAl alloy, the alloy is in aviation
The application component being adapted in engine is the critical components such as high-pressure compressor blade, engine turbine blade, swirler and casing.
Due to the presence for the shortcomings of TiAl-base alloy plasticity and toughness are poor, shaping difficulty is big, inevitably cause TiAl bases
There is the defects of cracked when the casting flaws such as stomata, shrinkage porosite, crackle and itself connection in preparation process in alloy-steel casting, because
Preparing for this material parts is extremely difficult.
Laser melting and coating technique is that selected cladding material is synchronously given on base alloy surface, then through laser treatment
It is allowed to and substrate top layer while melts, and is rapidly solidificated into the superficial layer that dilution factor is low, with base material is in metallurgical binding, so as to
The process of the characteristic such as wear-resisting, anti-corrosion, heat-resisting of base material is significantly changed, cladding layer thickness is controllable, can carry out constituency and melt
Cover, therefore this method is widely used in the surface modification of titanium alloy.
Analyzed based on more than, this patent uses laser melting and coating technique, using TC4 titanium alloys as base material, prepares TiAl Base Metals
Between compound gradient fire proofing.
The content of the invention
The fire-retardant material of TiAl base intermetallic compound gradients is prepared on titanium alloy material the purpose of the present invention is to propose to one kind
The laser manufacture method of material, it is mainly used in the preparation of titanium alloy surface flame-retardant layer, improves the flame-retarding characteristic of titanium alloy.
The particular content of technical solution of the present invention is：
The step of this method is：
(1) fire-retardant layer material is prepared, fire-retardant layer material is TiAl, Ti2AlNb or Ti3Al, using centrifugation powder mode system
Powder, granularity are the mesh of 150 mesh~325；
(2) TiAl, Ti2AlNb or Ti are prepared on titanium alloy base material using the method for laser melting coating3Al fire proofings；When
During using Ti2AlNb as flame-retardant layer, laser melting coating preparation is carried out directly on titanium alloy base material；When from Ti3Al is as resistance
When firing layer, in the Ti2AlNb conducts for preparing one layer of 0.2~0.5mm using the method for laser melting coating first on titanium alloy base material
Between transition zone, then laser melting coating Ti3Al flame-retardant layers, thickness are 0.2~0.5mm；When from TiAl as flame-retardant layer, first
One layer of 0.2~0.5mm Ti2AlNb is prepared as intermediate layer using the method for laser melting coating on titanium alloy base material, so
Titanium alloy base material is preheated afterwards, when preheating temperature reaches 750 DEG C, using laser cladding method in Ti2AlNb transition zones
Upper preparation TiAl flame-retardant layers, thickness are 0.2~0.5mm；
(3) after the completion of prepared by flame-retardant layer, under Ar gas shieldeds or vacuum environment, overall stress relief annealing process is carried out, is moved back
Fiery temperature range：650 DEG C~850 DEG C.
The present invention has the advantage that and beneficial effect
The present invention is fire-retardant in titanium alloy material surface preparation TiAl base intermetallic compound gradients using laser melting and coating technique
Material, laser melting coating have the advantage that when preparing functionally gradient material (FGM)：The energy density of laser beam is high, and firing rate is fast, to titanium
The heat affecting of alloy base material is smaller, and the depth for fusing into titanium alloy base material can be controlled in below 0.1mm, residual stress caused by postwelding
It is small, cause the deformation of base material small, the generation of control surface crackle；The thickness range of cladding layer is larger, and individual layer cladding thickness 0.1~
2.0mm；Accurately control the forming thickness of functionally gradient material (FGM).
Titanium alloy prepared by the present invention/TiAl base intermetallic compound gradient fire proofings, because middle transition layer material
With preferred, the material surface flawless defect of preparation technology, fusion rate is up to 100% between each layer of functionally gradient material (FGM), with reference to fine.
Titanium alloy/Ti3Al functionally gradient material (FGM)s surface can 600~650 DEG C of heatproof, titanium alloy/Ti2AlNb functionally gradient material (FGM)s surface can heatproof 650
~700 DEG C, titanium alloy/TiAl functionally gradient material (FGM)s surface can 700~750 DEG C of heatproof, the functionally gradient material (FGM) remaining titanium alloy lightweight
While characteristic, the flame-retarding characteristic of titanium alloy surface is drastically increased, high-speed aircraft is may extend to and high thrust-weight ratio is started
The material development of machine Burn-Resistant Titanium Alloy.
Embodiment：
Technical solution of the present invention is described in further detail below with reference to example：
According to the installation position of Burn-Resistant Titanium Alloy component aboard, the fire retardancy situation needed for it is analyzed, is clearly needed
The fire proofing to be selected, analyze and confirm more than, implement step in detail below：
(1) fire-retardant layer material is prepared, fire-retardant layer material is TiAl (Ti-25Al-2Nb), Ti2AlNb (Ti-22Al-25Nb)
Or Ti3Al (Ti-24Al-11Nb), using centrifugation powder mode by 3 kinds of material powder, granularity is the mesh of 150 mesh~325；
(2) removing surface before preparing, is polished using wire wheel and removes oxidation film on titanium alloy surface, and metal is exposed in visual inspection
Background color, then scrubbed with acetone；
(3) TiAl, Ti2AlNb or Ti are prepared on titanium alloy base material using the method for laser melting coating3Tri- kinds of fire-retardant materials of Al
Material, when using Ti2AlNb as flame-retardant layer, laser melting coating preparation is carried out directly on titanium alloy base material；When from Ti3Al makees
For flame-retardant layer when, the Ti2AlNb for being prepared one layer of 0.2~0.5mm using the method for laser melting coating first on titanium alloy base material is made
For intermediate layer, then laser melting coating Ti3Al flame-retardant layers, thickness are 0.2~0.5mm；When from TiAl as flame-retardant layer,
One layer of 0.2~0.5mm Ti2AlNb is prepared as middle transition using the method for laser melting coating first on titanium alloy base material
Layer, is then preheated to titanium alloy base material, when preheating temperature reaches 750 DEG C, using laser cladding method in Ti2AlNb mistakes
Preparation TiAl flame-retardant layers on layer are crossed, thickness is 0.2~0.5mm；
(4) after the completion of prepared by flame-retardant layer, under Ar gas shieldeds or vacuum environment, overall stress relief annealing process is carried out, is moved back
Fiery temperature range：650 DEG C~850 DEG C, furnace cooling.
Instantiation one
Ti2AlNb flame-retardant layers are prepared in TC4 titanium alloy rings inwall using laser melting coating
The preparation of 1.TC4 titanium alloys ring and Ti2AlNb powder
TC4 titanium alloy rings are processed, size is Ф 300mm × 150mm × 5mm, is prepared using centrifugation powder mode
Ti2AlNb powder, powdered ingredients Ti-22Al-25Nb, granularity are the mesh of 150 mesh~325.
2. flame-retardant layer prepares and stress relief annealing
(1) removing surface before preparing, is polished TC4 titanium alloy ring inwalls using wire wheel, removes surface oxidation
Film, visual inspection expose metal background color, are then scrubbed whole ring with acetone；
(2) titanium alloy ring is arranged on 6KW optical-fiber laser Three-dimension process system rotary tables, swashed from rational
Light cladding parameter, in the direct cladding Ti2AlNb fire proofings of TC4 titanium alloy ring inwalls, flame-retardant layer thickness 0.5mm is prepared, it is single
Thickness degree 0.25mm；
(3) after the completion of prepared by flame-retardant layer, in a vacuum furnace, overall stress relief annealing process, annealing schedule are carried out：700℃
× 1h, furnace cooling.
Instantiation two
Ti is prepared on TC4 titanium alloy substrates using laser melting coating3Al flame-retardant layers
1.TC4 titanium alloy substrates and Ti2AlNb powder and Ti3The preparation of Al powder
TC4 titanium alloy substrates are processed, size is 500mm × 500mm × 5mm, and Ti2AlNb is prepared using centrifugation powder mode
Powder and Ti3Al powder, powdered ingredients are respectively Ti-22Al-25Nb and Ti-24Al-11Nb, and granularity is the mesh of 150 mesh~325.
2. flame-retardant layer prepares and stress relief annealing
(1) removing surface before preparing, is polished TC4 titanium alloy substrates using wire wheel, removes surface film oxide, mesh
Inspection, which is looked into, exposes metal background color, is then scrubbed with acetone；
(2) titanium alloy substrate is fixed in 6KW optical-fiber laser Three-dimension process system workbench, melted from rational laser
Parameter is covered, the thick Ti2AlNb of one layer of 0.5mm are prepared as middle transition using the method for laser melting coating first on TC4 base materials
Layer, then the laser melting coating Ti on Ti2AlNb layers3Al flame-retardant layers, prepare flame-retardant layer thickness 0.5mm；
(3) after the completion of prepared by flame-retardant layer, in a vacuum furnace, overall stress relief annealing process, annealing region are carried out：
700 DEG C × 1h, furnace cooling.
Embodiment three
TiAl flame-retardant layers are prepared on TC4 titanium alloy substrates using laser melting coating
The preparation of 1.TC4 titanium alloy substrates and Ti2AlNb powder and TiAl powder
TC4 titanium alloy substrates are processed, size is 100mm × 100mm × 15mm, is prepared using centrifugation powder mode
Ti2AlNb powder and TiAl powder, powdered ingredients are respectively Ti-22Al-25Nb and Ti-25Al-2Nb, and granularity is the mesh of 150 mesh~325.
Flame-retardant layer prepares and stress relief annealing
(1) removing surface before preparing, is polished TC4 titanium alloy substrates using wire wheel, removes surface film oxide, mesh
Inspection, which is looked into, exposes metal background color, is then scrubbed with acetone；
(2) titanium alloy substrate is fixed in 6KW optical-fiber laser Three-dimension process system workbench, melted from rational laser
Parameter is covered, the thick Ti2AlNb of one layer of 0.5mm are prepared as middle transition using the method for laser melting coating first on TC4 base materials
Layer, is then preheated to titanium alloy base material, when preheating temperature reaches 750 DEG C, using laser cladding method in Ti2AlNb mistakes
Cross preparation TiAl flame-retardant layers, thickness 0.5mm on layer；
(3) after the completion of prepared by flame-retardant layer, in a vacuum furnace, overall stress relief annealing process, annealing region are carried out：
815 DEG C × 1h, furnace cooling.
Compared with prior art, chemical combination between the TiAl Base Metals prepared on TC4 titanium alloys using technical solution of the present invention
Thing flame-retardant layer flawless defect, the flame-retarding characteristic of TC4 materials is remarkably improved, and process operation is convenient, process stabilizing, repeatability
It is good, technology maturation.It can be widely popularized.
Claims (1)
- A kind of 1. laser manufacture method that TiAl-base alloy gradient fire proofing is prepared on titanium alloy, it is characterised in that：The party The step of method is：(1) fire-retardant layer material is prepared, fire-retardant layer material is TiAl, Ti2AlNb or Ti3Al, using centrifugation powder mode powder, grain Spend for the mesh of 150 mesh~325；(2) TiAl, Ti2AlNb or Ti are prepared on titanium alloy base material using the method for laser melting coating3Al fire proofings；Work as use When Ti2AlNb is as flame-retardant layer, laser melting coating preparation is carried out directly on titanium alloy base material；When from Ti3Al is as flame-retardant layer When, the Ti2AlNb for preparing one layer of 0.2~0.5mm using the method for laser melting coating first on titanium alloy base material is used as middle mistake Layer is crossed, then laser melting coating Ti3Al flame-retardant layers, thickness are 0.2~0.5mm；When from TiAl as flame-retardant layer, first in titanium One layer of 0.2~0.5mm of the method preparation Ti2AlNb of laser melting coating is used on alloy base material as intermediate layer, it is then right Titanium alloy base material is preheated, and when preheating temperature reaches 750 DEG C, is made using laser cladding method on Ti2AlNb transition zones Standby TiAl flame-retardant layers, thickness is 0.2~0.5mm；(3) after the completion of prepared by flame-retardant layer, under Ar gas shieldeds or vacuum environment, overall stress relief annealing process, annealing temperature are carried out Spend scope：650 DEG C~850 DEG C.
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| CN109518139B (en) * | 2018-12-13 | 2021-02-26 | 北京金轮坤天特种机械有限公司 | Titanium fire flame-retardant coating and preparation method thereof |
| CN111230113A (en) * | 2020-02-28 | 2020-06-05 | 沈阳工业大学 | Method for preparing TC4/TiAl gradient material by synchronously feeding powder through laser |
| CN114635132B (en) * | 2022-05-17 | 2022-08-02 | 北京煜鼎增材制造研究院有限公司 | Titanium fire-resistant coating of titanium alloy and preparation method thereof |
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