CN106337111B - A kind of surface reinforcing method based on heat radiation and laser impact intensified combination - Google Patents
A kind of surface reinforcing method based on heat radiation and laser impact intensified combination Download PDFInfo
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- CN106337111B CN106337111B CN201610768782.2A CN201610768782A CN106337111B CN 106337111 B CN106337111 B CN 106337111B CN 201610768782 A CN201610768782 A CN 201610768782A CN 106337111 B CN106337111 B CN 106337111B
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- laser impact
- impact intensified
- heat radiation
- processing
- fatigue
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
Abstract
The present invention relates to surface peening field and laser impact intensified fields, refer in particular to a kind of surface reinforcing method based on heat radiation and laser impact intensified combination.First determine that the region area of fatigue fracture easily occurs for crucial important meals alloy components according to fatigue test, secondly the region that fatigue fracture easily occurs in component surface carries out laser impact intensified processing for the first time, then processed sample is placed into the heat radiation device with certain temperature and stands a period of time, to make the stress release of component surface generation to a certain extent, the sample that will finally carry out above-mentioned laser impact intensified processing and heat radiation processing again carries out second of laser impact intensified processing.This method can effectively slow down residual stress caused by fretting fatigue etc. under high temperature and discharge, while promote the fatigue strength that key member can bear, to effectively extend the fatigue life that key member works at high temperature.
Description
Technical field
The present invention relates to surface peening field and laser impact intensified fields, refer in particular to a kind of based on heat radiation and laser punching
The surface reinforcing method strengthened and combined is hit, stress release speed when this method effectively can delay component to work under high temperature environment
Degree, is particularly suitable for the component to work at high temperature.
Background technology
Laser impact intensified (laser shock peening/processing, LSP) is to be used for promoting metal structure at present
A kind of common surface treatment mode of part fatigue strength.It is arrived using the laser emission with short pulse peak power density
Metal surface, laser beam transparent restraint layer, absorbed layer are absorbed, and are converted to shock motion to material internal, are being utilized punching
The power for hitting wave formation generates plastic deformation in material surface, makes the crystal grain refinement on surface layer, and form deeper residual compressive stress layer,
To be obviously improved fatigue strength and the fatigue life of material.A large amount of research has shown that reiforcing laser impact technology is to extend
The crack initiation time reduces the effective means that crack propagation velocity improves material lifetime.
There are when chucking power and small relative movement among two mechanical components, fretting wear just has occurred.And
Under CYCLIC LOADING, fretting wear can cause fatigue crack to germinate and increase ahead of time, significantly so as to cause Predict Fatigue Life of Components
Shorten, and the shortening of this fatigue life caused by fretting wear is frequently due to the increasing of contact area tensile stress or shear stress
Grow and vibrate surface and secondary superficial lesions that opposite displacement is brought.Fretting wear occurs often in the riveting of gas engine engine
Connect, be bolted and the structures such as dovetail at.These structures usually work at high temperature.Therefore these components are studied in high temperature
Under stress release speed, there is the great function of reality in fatigue strength and service life.This method is outstanding for crucial important component
It is the repair of crucial expensive part and using putting forward, and heat radiation process, energy are added compared with other laser shock peening methods
The enough release for effectively slowing down surface compress residual stresses, to promote the fatigue strength of material, the fatigue life of member for prolonging.
It is most of to be carried out at room temperature or at elevated temperature completely in relation to laser impact intensified surface reinforcing method, or
Person first carry out after associated hot processing carry out it is laser impact intensified, such as the laser shock peening methods of Wang Cheng in a heated condition
And under thermostat patent and a kind of ultra-low temperature surroundings laser impact intensified weldment method and apparatus etc..There is presently no will
The surface strengthening technology that reiforcing laser impact technology and heat radiation are combined, this method make laser reinforcing technology and heat radiation
Its effect is played for two independent steps, there is very strong novelty and creativeness.
Invention content
To solve the above-mentioned problems, the present invention proposes the remnants that slow down to work at high temperature for crucial important component and answers
The surface reinforcing method that power rate of release puts forward, this method mainly use the laser impact intensified side being combined with heat radiation
Formula slows down the rate of release of residual compressive stress when component works at high temperature, to improve fatigue life and the intensity of material.
It is specific, and steps are as follows in fact：
(1) it chooses N number of crucial important meals component and carries out fatigue test, the position of N number of different fractures is recorded, using statistics
Method determine that the region area A of fatigue fracture easily occurs for the component；Specimen Number N >=20 of selection.
(2) laser impact intensified processing for the first time is carried out to the region A established in step (1)；Wherein, laser impact intensified
Parameter is as follows：Light spot shape is circle, a diameter of 3mm, pulsewidth 8-30ns, pulse energy 3-15J, horizontal and vertical overlapping rate
It is 50%.
(3) by the sample handled well in step (2) be placed into the heat radiation device with certain temperature B stand one section when
Between C, carry out heat radiation processing, wherein 150 DEG C≤B≤400 DEG C, 1h≤C≤2h.
(4) second of laser impact intensified processing is carried out to the region A of the sample after being handled by step (3), wherein
Laser impact intensified parameter and step (2) are identical, as follows：Light spot shape is circle, a diameter of 3mm, pulsewidth 8-30ns, pulse
Energy 3-15J, horizontal and vertical overlapping rate are 50%, and so far the processing step of this method is fully finished.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to example or existing
Attached drawing is briefly described needed in technology description.
Fig. 1 is the operating procedure flow chart of surface reinforcing method described herein.
Fig. 2 is that case specimen size schematic diagram is embodied herein.
Fig. 3 is the region area A that case sample fatigue fracture is embodied herein.
Fig. 4 is that only progress is same laser impact intensified twice, and laser impact intensified processing twice is carried out under heating environment
Sample, first carry out annealing heat-treats after carry out twice the sample of laser impact intensified processing and by this method handle examination
The surface residual stress and time graph of sample.
Fig. 5 is that only progress is same laser impact intensified twice, and laser impact intensified processing twice is carried out under heating environment
Sample, first carry out annealing heat-treats after carry out twice the sample of laser impact intensified processing and by this method handle examination
The S-N curves of sample.
Specific implementation mode
The specific implementation mode of the present invention is described in detail with reference to the accompanying drawings and examples, but the present invention should not be only
It is limited to embodiment.
The present embodiment uses the national standard sample of tension test, and specific size is as shown in figure 3, gauge length is 50 × 15mm2,
Matrix of samples material is biphase titanium alloy TC4.
A kind of example of the sample handled using above-mentioned enhanced processing method, step are：
(1) standard sample for choosing 30 two-way titanium alloy TC 4s carries out fatigue test, counts the fracture position of this 30 samples
It sets, it is found that two fractures of lie farthest away are distributed in the both ends of sample respectively, one of them is away from left end 85mm, such as Fig. 3 (b),
Another is away from left end 135mm such as Fig. 3 (c), and the distance between two fractures are 50mm, and the width of component is 15mm, therefore, root
According to rectangular area calculation formula：It is long × wide, obtain region area A=50 × 15=that fatigue fracture easily occurs for the component
750mm2, as shown in Fig. 3 (a).
(2) laser impact intensified processing for the first time is carried out to the region A established in step (1), wherein laser impact intensified
Parameter is as follows：Light spot shape is circle, a diameter of 3mm, pulsewidth 8-30ns, pulse energy 3-15J, horizontal and vertical overlapping rate
It is 50%.
(3) by the sample handled well in step (2) be placed into the heat radiation device with certain temperature B stand one section when
Between C, carry out heat radiation processing, wherein B=360 DEG C of the temperature of heat radiation, duration C=2h.
(4) second of laser impact intensified processing is carried out to the region A of the sample after being handled by step (3), wherein
Laser impact intensified parameter and step (2) are identical, as follows：Light spot shape is circle, a diameter of 3mm, pulsewidth 8-30ns, pulse
Energy 3-15J, horizontal and vertical overlapping rate are 50%, and so far the processing step of this method is fully finished.
(5) laser impact intensified twice to the region A progress established in step (1), 1 is organized as a comparison；
(6) laser impact intensified twice to the region A progress established in step (1), and all laser impact intensified places
Reason process is carried out in the case where being 360 DEG C in temperature, organizes 2 as a comparison.
(7) laser impact intensified twice to the region A progress established in step (1), before laser impact intensified processing
It is first made annealing treatment accordingly, annealing temperature is 800 DEG C, and annealing time 1.5h organizes 3 as a comparison.
As shown in figure 4, for the residual stress figure of specimen surface, abscissa is the time for carrying out fatigue test, and ordinate is
Residual-stress value, what solid line indicated is by the sample of laser-impact twice, and double dot dash line indicates to carry out twice under heating environment
The sample of laser impact intensified processing, chain-dotted line indicate first to carry out to carry out laser impact intensified processing twice after annealing heat-treats
Sample, dotted line then indicates the sample of this method processing, figure 4, it is seen that in the condition for carrying out identical fatigue test
Under, it is returned to for 0 time for the residual stress of specimen surface, contrast groups 1,2 and 3 are obviously smaller than the examination of this method processing
Sample, therefore, it can be deduced that this method can delay the rate of release of surface compress residual stresses, because have passed through heat in processing procedure
Radiation treatment, so being released by the portion of residual tensile stress on laser impact intensified surface for the first time, by same parameter fatigue
After test process, the rate of release of surface compress residual stresses is less than contrast groups 1 and 3, and is constantly in heating for contrast groups 2
Laser-impact processing under state, temperature then can generate release to the residual compressive stress of second of laser impact intensified formation, from
And affect the releasing effect of final residual compressive stress.
As shown in figure 5, respectively the sample of contrast groups 1,2 and 3 and this method processing sample respectively 650MPa,
Fatigue test is carried out under the pressure of 600MPa, 550MPa, 500MPa and 450MPa, obtains its fatigue life N respectivelyf, and draw
At curve.It can be seen from the figure that the fatigue life of contrast groups 1,2 and 3 is obviously than the fatigue life of the sample of this method processing
Want low, this is primarily due to the release speed that heat radiation processing significantly reduces sample surface compress residual stresses in testing fatigue
Degree, so that fatigue life has obtained further extension, fatigue strength has obtained further raising.
Claims (4)
1. a kind of surface reinforcing method based on heat radiation and laser impact intensified combination, it is characterised in that：Using laser-impact
Strengthen the mode being combined with hyperthermia radiation, improve the fatigue strength of material, crucial important meals are first determined according to fatigue test
The region area of fatigue fracture easily occurs for alloy components, and the region that fatigue fracture secondly easily occurs in component surface carries out for the first time
Laser impact intensified processing, then by processed sample be placed into the heat radiation device with certain temperature stand one section when
Between, to make component surface generate a degree of stress release, will finally carry out again above-mentioned laser impact intensified processing with
And the sample of heat radiation processing carries out second of laser impact intensified processing, is as follows：
(1) it chooses N number of crucial important meals component and carries out fatigue test, the position of N number of different fractures is recorded, using the side of statistics
Method determines that the region area A of fatigue fracture easily occurs for the component；
(2) laser impact intensified processing for the first time is carried out to the region A established in step (1)；
(3) sample handled well in step (2) is placed into standing a period of time C in the heat radiation device with certain temperature B,
Carry out heat radiation processing；
(4) second of laser impact intensified processing is carried out to the region A of the sample after being handled by step (3), it is so far our
The processing step of method is fully finished.
2. a kind of surface reinforcing method based on heat radiation and laser impact intensified combination as described in claim 1, feature
It is, in step (1), Specimen Number N >=20 of selection.
3. a kind of surface reinforcing method based on heat radiation and laser impact intensified combination as described in claim 1, feature
It is, in step (2) and (4), laser impact intensified parameter is as follows：Light spot shape is circle, a diameter of 3mm, pulsewidth 8-
30ns, pulse energy 3-15J, horizontal and vertical overlapping rate is 50%.
4. a kind of surface reinforcing method based on heat radiation and laser impact intensified combination as described in claim 1, feature
It is, in step (3), 150 DEG C≤B≤400 DEG C, 1h≤C≤2h.
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| CN107253148B (en) * | 2017-04-25 | 2020-05-01 | 江苏大学 | Combination method for forming gradient nano structure on surface layer of metal workpiece |
| CN109454155B (en) * | 2018-10-10 | 2020-05-22 | 温州大学激光与光电智能制造研究院 | Laser shot peening shape righting method for thin-wall through hole piece |
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