CN104313600B - Impaired titanium alloy forging continuous point type forging and stamping Laser forming repair method - Google Patents
Impaired titanium alloy forging continuous point type forging and stamping Laser forming repair method Download PDFInfo
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- CN104313600B CN104313600B CN201410512322.4A CN201410512322A CN104313600B CN 104313600 B CN104313600 B CN 104313600B CN 201410512322 A CN201410512322 A CN 201410512322A CN 104313600 B CN104313600 B CN 104313600B
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Abstract
A kind of impaired titanium alloy forging continuous point type forging and stamping Laser forming repair method, it is mainly inserts inert atmosphere protecting housing by impaired titanium alloy forging, controls oxysome fraction content less than 5 × 10 5；High accuracy two-way coaxial powder feeding system is used to carry out titanium alloy laser deposition reparation, laser power: 1800 5000W；Scanning speed: 3 10mm/s；Spot diameter: 3 6mm；Overlapping rate: 30 50%；Powder feeding rate: 5 15g/min；Forging and pressing the above-mentioned titanium alloy forging through laser repairing, drafts is 4 12 tons；Under the control of the computer, repairing titanium alloy material upper surface along laser deposition, the forging and stamping of little area are implemented in pointwise continuously, repeat above-mentioned steps, until it reaches repair the standard size that forging is qualified；The above-mentioned titanium alloy forging through repairing is carried out dynamic recrystallization treatment, and temperature is 850 960 DEG C, and temperature retention time is 1h 3h, and air cooling is to room temperature.The present invention can realize shaping the active control repairing the internal recrystallized structure structure of titanium alloy partial structurtes and crystallite dimension.
Description
Technical field
The present invention relates to the restorative procedure of a kind of metal forging.
Background technology:
Laser forming repair is metal parts reparation and the re-manufacturing technology of a kind of advanced person, and this technology utilizes quickly
The ultimate principle of raw basin (Rapid Prototype Manufacturing, RPM) technology, computer
Digital control system under distressed metal parts locally structure CAD mathematical model hierarchy slicing data-driven, by by
Layer adds laser fusion/solidified metal material, the geometry of fast quick-recovery metal parts local damage structure
The military service performance of characteristic and part, the reparation traditional with some and re-manufacturing technology (thermal spraying, Brush Plating,
Soldering, TIG weldering, MIG weldering) compare, there is advantage highlighted below in this technology: (1) laser beam energy collection
In, heat affected area is minimum, Laser forming repair process to metal parts base material almost without hot injury；(2)
Flexible high, under without any mould and machine condition, quickly realize metal parts arbitrary shape local damage knot
The near-net forming of structure；(3) material scope of application width, it is possible to achieve to including the difficulties such as W, Mo, Nb, Ta
Between molten metal and alloy, refractory metal including the various alloy with high activity such as compound alloy and Ti base etc.
All kinds of high-performance metal materials parts reparation with remanufacture.Just because of its above-mentioned unique features, it is allowed to
In the defence equipments such as Aeronautics and Astronautics the parts reparation of high added value emphasis with remanufacture have the most wide
Application prospect.
1995-1997, John Ha Pujinsi university of the U.S., Pennsylvania State University, MTS company
And Boeing does in U.S. Department of Defense's defense advanced project administration (DARPA) and the research of naval of Ministry of National Defence
Under public room (ONR) joint funding, develop entitled LasformTMTitanium Alloy Aircraft structural member laser quick
Shaping and recovery technique, within 1998, MTS company individual proprietorship establishes AeroMet subsidiary, specializes in
LasformTMThe through engineering approaches application of technology.LasformTMKnow-why be: with titanium alloy hot-rolling stock or forging
Part is substrate, and computer controls laser fusion titanium alloy powder/rapid solidification and successively piles up, titanium alloy-based
On plate, in the way of interpolation, " growth and shaping " goes out the structure such as reinforcement, jointing, therefore, LasformTM
Manufacture in technical spirit is a kind of inside titanium alloy structure part with line and staff control.At Laser Melting Deposition
In forming process, laser moves molten bath extraordinary metallurgy kinetics behavior and non-under ultra high temperature gradient effect
Balance rapid solidification forming core and growth process, determine Laser Melting Deposition shape " interpolation " reinforcement and
Jointing, its internal grain form, size, crystal orientation, grain boundary structure etc. and titanium alloy substrate tissue
Between there is extremely significantly difference, and it is inconsistent to directly result in mechanical property between the two, though quiet through heat etc. again
Pressure (HIP), open die forging (Open Die Forging) processing, the Ti6Al4V that AeroMet company manufactures
Titanium alloy structure part, its fatigue mechanics performance is still significantly lower than titanium alloy forging, it is difficult to realize it at aircraft
Application on structural member, the most finally in Decembers, 2005 of AeroMet company are forced the closedown that stops doing business.
Northwestern Polytechnical University uses laser solid forming Technique on T i6Al4V and two kinds of titanium alloy forgings of Ti17
Carry out Laser forming repair, owing to the non-equilibrium rapid solidification structure of laser repairing titanium alloy material is forged with titanium alloy
Difference between part matrix forging annealed structure, and mechanical property is inconsistent between the two, Laser forming repair
Ti6Al4V, Ti17 forging, its fatigue behaviour is far below titanium alloy forging；Beijing Non-Ferrous Metal Research General Academy
Have studied laser repairing TC11 titanium alloy forging interior tissue and mechanical property thereof, result shows, laser repairing
TC11 titanium alloy material tissue is dramatically different with forging matrix, and plasticity is forged significantly lower than titanium alloy
Part, the overall mechanical property of the TC11 titanium alloy forging of reparation does not reaches aviation military service mechanical property standard.
Summary of the invention:
In order to solve Laser forming repair titanium alloy forging, its mechanical property is asked far below titanium alloy forging etc.
Topic, the present invention provides a kind of continuous point type of impaired titanium alloy forging to forge and press Laser forming repair method.
Technical scheme is as follows:
(1) impaired large complicated aero titanium alloy forging is inserted inert atmosphere protecting housing, after being installed, envelope
Case, for preventing titanium alloy from aoxidizing in During Laser Rapid Forming, uses argon shield, controls oxysome integration
Number content is less than 5 × 10-5；Then high accuracy two-way coaxial powder feeding system is used to carry out titanium alloy laser deposition
Repair, according to deposit track until ground floor cladding completes；Laser technical parameters is laser power: 1800-
5000W；Scanning speed: 3-10mm/s；Spot diameter: 3-6mm；Overlapping rate: 30-50%；Powder feeding speed
Rate: 5-15g/min；
(2) the above-mentioned titanium alloy forging through laser repairing is forged and pressed, selects cambered surface point type pressure head,
The drafts arranging press ram is 4-12 ton；, under the control of the computer, repair titanium along laser deposition and close
Gold copper-base alloy upper surface, pointwise implement continuously little area forging and stamping, ground floor cladding material has all been forged and pressed,
Force laser deposition to repair titanium alloy material and from outward appearance to inner essence acutely plasticity cold deformation occurs, make laser deposition reparation
The non-equilibrium rapid solidification structure of titanium alloy material is changed into forging tissue；Owing to point type forging and stamping have deformed area
It is little, without the feature that stress state is three-dimensional compressive stress in deformation dead band, deformed area, therefore, on the one hand,
Point type forging and stamping are easily achieved the pointwise uniform plastic deformation of laser repairing titanium alloy layer continuously, and laser is effectively ensured
Deposition repairs the uniformity of titanium alloy forging tissue；On the other hand, after continuous point type forges and presses, previous sharp
The residual tension that light deposition is repaired in titanium alloy material translates into residual compressive stress.
Repeat above-mentioned (1), (2) step, until it reaches repair the standard size that forging is qualified.
(3) the above-mentioned titanium alloy forging through repairing is put into and is carried out dynamic recrystallization treatment in heat-treatment furnace,
Temperature is 850-960 DEG C, and Optimal Temperature is 920-940 DEG C；Temperature retention time is 1-3h, and optimum temperature retention time is
1h；Air cooling is to room temperature.
The present invention compared with prior art has the advantage that
Can realize repairing the internal recrystallized structure structure of titanium alloy forging partial structurtes, recrystallization crystalline substance to shaping
The active of particle size controls, it is to avoid in new laser deposition repair process, owing to transient thermal stress is with front
One laser deposition is repaired the residual tension reciprocal action in titanium alloy material and is caused stress intensity to increase, with
Time avoid cause owing to stress intensity exceedes titanium alloy material yield strength titanium alloy forging produce plasticity become
Shape；And effectively prevent the titanium alloy forging deformation accumulation effect caused by thermal stress intensity circulative accumulation
Should.
Accompanying drawing explanation
Fig. 1 is that the continuous point type of the present invention forges and presses Laser forming repair process schematic.
Detailed description of the invention:
Embodiment 1
As it is shown in figure 1, impaired large complicated aero titanium alloy forging 1 is inserted inert atmosphere protecting housing 6,
After being installed, upper cover 5 joint sealing is installed, after the oxygen content in atmosphere in case is down to 50PPm, passes through laser head
2, use high accuracy two-way coaxial powder feeding system to carry out titanium alloy laser deposition reparation, straight according to deposit track
Complete to ground floor cladding.Laser technical parameters is laser power: 1800W；Scanning speed: 3mm/s；Light
Spot diameter: 3mm；Overlapping rate: 30%；Powder feeding rate: 5g/min, forms titanium and closes on titanium alloy forging surface
Gold laser deposition repair layer 7；The above-mentioned titanium alloy forging through laser repairing is forged and pressed, with depression bar 3
The press ram 4 connected is cambered surface point type pressure head, and the drafts arranging pressure head is 4 tons, in computer control
Under system, repairing titanium alloy forging upper surface along laser deposition, the forging and stamping of little area are implemented in pointwise continuously, by first
Layer cladding material has all forged and pressed.Repeat above-mentioned cladding and forging step until reaching former forging's block dimension, will
The above-mentioned titanium alloy forging through repairing is put into and is carried out dynamic recrystallization treatment in heat-treatment furnace, and temperature is 850
DEG C, temperature retention time is 2h, and air cooling is to room temperature.
Embodiment 2
Impaired large complicated aero titanium alloy forging is inserted inert atmosphere protecting housing, after being installed, improves upper cover
Joint sealing, after the oxygen content in atmosphere in case is down to 50PPm, by laser head, uses high accuracy two-way same
Axle powder feed system carries out titanium alloy laser deposition reparation, according to deposit track until ground floor cladding completes.Adjust
Whole laser technical parameters is laser power: 5500W；Scanning speed: 7mm/s；Spot diameter: 4mm；
Overlapping rate: 40%；Powder feeding rate: 10g/min；Form titanium alloy laser deposition to repair on titanium alloy forging surface
Cladding；The above-mentioned titanium alloy forging through laser repairing is forged and pressed, the press ram being connected with depression bar
For cambered surface point type pressure head, the drafts arranging pressure head is 8 tons, under the control of the computer, repaiies along laser deposition
Multiple titanium alloy forging upper surface, pointwise is implemented the forging and stamping of little area continuously, is all forged and pressed by ground floor cladding material
Complete.Repeat above-mentioned cladding and forging step until reaching former forging's block dimension, the above-mentioned titanium through repairing is closed
Bodkin part is put into and is carried out dynamic recrystallization treatment in heat-treatment furnace, and temperature is 920 DEG C, and temperature retention time is 1h, empty
It is cooled to room temperature.
Embodiment 3
Impaired large complicated aero titanium alloy forging is inserted inert atmosphere protecting housing, after being installed, improves upper cover
Joint sealing, after the oxygen content in atmosphere in case is down to 50PPm, by laser head, uses high accuracy two-way same
Axle powder feed system carries out titanium alloy laser deposition reparation, according to deposit track until ground floor cladding completes.Adjust
Whole laser technical parameters is laser power: 10000W；Scanning speed: 10mm/s；Spot diameter:
6mm；Overlapping rate: 50%；Powder feeding rate: 15g/min；Titanium alloy laser is formed on titanium alloy forging surface
Deposition repair layer；The above-mentioned titanium alloy forging through laser repairing is forged and pressed, the pressure being connected with depression bar
Compressing head is cambered surface point type pressure head, and the drafts arranging pressure head is 12 tons, under the control of the computer, along laser
Deposition repairs titanium alloy forging upper surface, and the forging and stamping of little area are implemented in pointwise continuously, by complete for ground floor cladding material
Portion has forged and pressed.Repeat above-mentioned cladding and forging step until reaching former forging's block dimension, by above-mentioned through repairing
Titanium alloy forging put into heat-treatment furnace carry out dynamic recrystallization treatment, temperature is 960 DEG C, and temperature retention time is
3h, air cooling is to room temperature.
Claims (2)
1. an impaired titanium alloy forging continuous point type forging and stamping Laser forming repair method, it is characterised in that:
(1) impaired large complicated aero titanium alloy forging is inserted inert atmosphere protecting housing, after being installed, joint sealing, use argon shield, control oxysome fraction content less than 5 × 10-5；Then using high accuracy two-way coaxial powder feeding system to carry out titanium alloy laser deposition reparation, according to deposit track until ground floor cladding completes, laser technical parameters is laser power: 1800-5000W；Scanning speed: 3-10mm/s；Spot diameter: 3-6mm；Overlapping rate: 30-50%；Powder feeding rate: 5-15g/min；
(2) the above-mentioned titanium alloy forging through laser repairing is forged and pressed, select cambered surface point type pressure head, the drafts arranging press ram is 4-12 ton, under the control of the computer, titanium alloy material upper surface is repaired along laser deposition, the forging and stamping of little area are implemented in pointwise continuously, have all been forged and pressed by ground floor cladding material；
Repeat above-mentioned (1), (2) step, until it reaches repair the standard size that forging is qualified；
(3) the above-mentioned titanium alloy forging through repairing being carried out in heat-treatment furnace dynamic recrystallization treatment, temperature is 850-960 DEG C, and temperature retention time is 1-3h, and air cooling is to room temperature.
The continuous point type of impaired titanium alloy forging the most according to claim 1 forging and stamping Laser forming repair method, it is characterised in that: the optimum temperature that the above-mentioned titanium alloy forging through repairing is carried out dynamic recrystallization treatment is 920-940 DEG C；Optimal temperature retention time is 1h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3505269A1 (en) * | 2018-01-02 | 2019-07-03 | General Electric Company | Forging head, forging device and additive manufacturing system |
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| CN107486522A (en) * | 2017-09-08 | 2017-12-19 | 国网湖北省电力公司检修公司 | Super extra high voltage line instrument laser formation method |
| CN107876763B (en) * | 2017-11-14 | 2020-10-20 | 中国航发北京航空材料研究院 | Preparation method of Nb-Si alloy with directional solidification structure characteristic |
| CN108588709B (en) * | 2018-05-10 | 2020-09-08 | 福建工程学院 | Ultrasonic and annealing-assisted laser cladding device and method for composite coating |
| CN109569799A (en) * | 2018-07-25 | 2019-04-05 | 沈阳精合数控科技开发有限公司 | A kind of wear-resisting Vertical Mill liner plate and increasing material manufacturing method |
| CN109267063A (en) * | 2018-11-06 | 2019-01-25 | 成都飞机工业（集团）有限责任公司 | A method of titanium alloy is repaired based on laser melting coating and forges beam surface defect |
| CN110449737A (en) * | 2019-08-19 | 2019-11-15 | 芜湖天弋能源科技有限公司 | A method of repairing housing of power cell and the fried point of top cover Laser Welding |
| CN110434340A (en) * | 2019-09-18 | 2019-11-12 | 燕山大学 | A kind of novel large titanium alloy forging mixed production method |
| CN110523983B (en) * | 2019-09-18 | 2021-06-29 | 燕山大学 | Novel manufacturing method of high-performance ultrafine-grained GH4169 metal turbine disk |
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