CN110016629A - A kind of wet blasting surface modifying method suitable for titanium alloy - Google Patents
A kind of wet blasting surface modifying method suitable for titanium alloy Download PDFInfo
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- CN110016629A CN110016629A CN201910367189.0A CN201910367189A CN110016629A CN 110016629 A CN110016629 A CN 110016629A CN 201910367189 A CN201910367189 A CN 201910367189A CN 110016629 A CN110016629 A CN 110016629A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The present invention relates to a kind of wet blasting surface modifying methods suitable for titanium alloy: carrying out removing surface to titanium alloy components, it is stifled to carry out package plug to the position for being unable to shot-peening；Wet blasting processing carried out to titanium alloy components using ceramic pellet and water, the mass ratio of water and ceramic pellet is 5:1, and treated that titanium alloy components are dried to wet blasting.Compared with prior art, the present invention only realizes the regulation to materials microstructure by the optimization of shot-blast process parameter, improves the versatility of method not by other processing modes；Cooling effect using water in wet blasting to material surface can reduce titanium alloy surface temperature, avoid generating spark, scorch and α phase embrittlement, to give full play to shot-peening modified effect；The defects of wet blasting utilizes the buffer function of water, can reduce the strain rate being plastically deformed during shot-peening, titanium alloy surface is avoided to generate micro-crack, reduces material surface roughness.
Description
Technical field
The present invention relates to bead blasted surfaces modification treatment technology fields, more particularly, to a kind of wet blasting suitable for titanium alloy
Surface modifying method.
Background technique
Titanium alloy has that density is smaller, specific strength is high, operating temperature range wide (- 253 DEG C~600 DEG C), medium temperature performance are steady
The performances such as fixed, nonmagnetic, preferable corrosion resistance and good biocompatibility, referred to as " space metal " and " ocean gold
Belong to ", extensive use has been obtained in the every field such as Aeronautics and Astronautics, military affairs, civilian.
Due to being influenced by alternating load and external environment, in engineer application, (such as aerospace is handed over for fatigue fracture
Logical transporting equipment, giant mechanical and electrical equipment etc.) most of titanium alloy components main failure forms, according to statistics, 80% part
Failure is as caused by fatigue fracture, and this severely limits the application of titanium alloy and development.
For the fatigue behaviour for improving titanium alloy, the process for modifying surface such as shot-peening can be used, it is complete by improving material surface
Property grade improves fatigue strength.But it due to the performance particularity of titanium alloy material, is primarily present after conventional dry bead
Following disadvantage: (1) titanium alloy poor thermal conductivity, surface can generate spark during shot-peening, lead to scorch, cause α phase crisp
Change, reduces its fatigue behaviour；(2) titanium alloy belongs to Patterns for Close-Packed Hexagonal Crystal structure (HCP), and plastic deformation ability is poor, in tradition
Since strain rate is larger during dry bead, it is easy that titanium alloy surface is made to generate micro-crack, reduces its surface integrity；
(3) because dry shot-peening does not have the lubricating action of water, specimen surface roughness is larger after bead, easily causes material surface stress
It concentrates, reduces Parts performance.
Chinese patent CN109487183A discloses a kind of wet blasting surface modifying method suitable for aluminium lithium alloy, uses
Following steps: (1) removing surface is carried out to aluminium lithium alloy part and protection is unable to the position of shot-peening；(2) to aluminium lithium alloy part
Carry out wet blasting processing；(3) the aluminium lithium alloy part Jing Guo bead is dried.It is vertical that aluminium lithium alloy belongs to the center of area
Square metal, in plastic history, slide surface is more, and deformation is relatively easy, but titanium alloy belongs to Patterns for Close-Packed Hexagonal Crystal structure,
Actuatable slip system is less in deformation process, deforms more difficult progress, therefore need to properly increase during bead
The technological parameters such as shot peening strength, muzzle velocity degree and bullet flow, to realize target shot blasting effect.But since titanium alloy is to shot-peening
Strength Changes are more sensitive and titanium alloy thermal conductivity is poor, and intensity is also slightly below nickel base superalloy, therefore during shot-peening
Excessively high shot peening strength can not be used, otherwise will lead to the problems such as material surface is folded, cracked even since frictional heat is excessively high
And spark is generated, fatigue of materials performance is reduced instead.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be suitable for titanium alloy
The wet shot blasting method of (including: the titanium alloys such as TC4, TC17, TC18,1023), i.e., the grinding fluid mixed using ceramic pellet and water is to titanium
Alloy carries out wet blasting processing, and wherein water can play cooling effect to by spray material surface, avoids titanium alloy in shot-peening process
The problems such as middle generation scorch, the embrittlement of α phase and generation crizzle, while water can also play the work of buffering and lubrication
With playing shot-peening modified effect to the maximum extent to reduce material surface roughness.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of wet blasting surface modifying method suitable for titanium alloy, using following steps:
Step 1: requiring according to element size specifications and characteristics, determines that target shot peening strength and target coverage rate etc. spray
Ball parameter；
Step 2: removing surface is carried out to sample or part, it is ensured that there is no greasy dirt or other pollutants；
Step 3: sample or part are checked, it is ensured that process before shot-peening is all in place；
Step 4: carrying out clamping to part, carries out package plug to components with adhesive tape or rubber skin and blocks up, protection is unable to shot-peening
Position；
Step 5: wet blasting processing is carried out to sample or part according to the requirements of process parameters；
Step 6: sample or part are unloaded from equipment after the completion of shot-peening；
Step 7: to after shot-peening sample or part check, guarantee the broken pellet that is not embedded in of surface, do not knock
It damages, the coverage rate and appearance on surface meet technical requirements；
Step 8: the components after drying bead, shot-peening is after the completion by workpiece as ventilation drying at room temperature.
Control air pressure is 0.8MPa~1.0MPa when wet blasting processing.
The control processing time is 11min~12min when wet blasting processing.
The initial velocity that ceramic pellet is dished out from compressed air shotblasting machine when wet blasting processing is 22m/s~40m/s.
The flow of ceramic pellet is 0.65kg/min~0.8kg/min when wet blasting processing.
The nozzle nickel base superalloy component surface distance of compressed air shotblasting machine is 40mm~49mm when wet blasting processing.
When wet blasting processing, the spray angle of ceramic pellet is 70 °~90 °, and shot-peening coverage rate is 100%.
When wet blasting processing, the intensity of the ceramic pellet used is 0.25mmC~0.3mmC.
When wet blasting processing, the specification of the ceramic pellet of use is selected referring to HBZ 26-2011.
The device that wet blasting uses is JY-120WB liquid shot-blasting machine.
Titanium alloy components are placed in the processing of ventilation drying at room temperature after the completion of shot-peening, temperature control is 15 DEG C~17 DEG C.
The present invention proposes only to pass through shot-blast process not by other any subsequent treatment process by the method for wet blasting
Parameter optimization realizes the regulation to materials microstructure.Cooling effect using water to specimen surface may be implemented to reduce titanium conjunction
The purpose of scorch, α phase embrittlement that gold occurs during conventional dry shot-peening can be with using the buffering and lubricating action of water
The defects of reducing the strain rate during shot-peening, surface is avoided to generate micro-crack, to effectively widen the bead blasted surfaces of titanium alloy
Modified technique parameter field significantly improves fatigue of materials performance.Actually active related process is used during titanium alloy wet blasting
Parameter, such as: air pressure, injecting time, pellet specification, muzzle velocity degree, pellet flow, nozzle to material surface distance,
Spray angle, shot peening strength, shot-peening coverage rate, abrasive material etc..
Bead under above-mentioned technological parameter can introduce bigger, deeper residual compressive stress field on titanium alloy surface layer,
The depth of surface reforming layer is also bigger, and for conventional dry shot-peening, wet blasting technique disclosed in this patent can be more effective
Ground inhibits the forming core of fatigue crack and extension, introduced residual compressive stress field that can reduce fatigue crack growth rate, thus
Improve the anti-fatigue performance of material.But when the technological parameters such as shot peening strength are more than the range of this patent, due to bullet impact energy
It measures excessively high the defects of material surface being made to fold, increases material surface roughness, since the excessively high generation spark of frictional heat is led
The embrittlement of α phase is caused, its surface integrity grade is reduced, is unfavorable for the improvement of its fatigue behaviour.Further, since the material of titanium alloy is hard
The mechanical properties such as degree, yield strength and tensile strength are higher than aluminium lithium alloy, and titanium alloy belongs to close-packed hexagonal (HCP) crystal
Structure, the slip system that can be started in deformation process is less, and under the effect of identical plus load, titanium alloy deformation is more difficult.
Therefore, compared with disclosed before " a kind of wet blasting surface modifying method suitable for aluminium lithium alloy of CN109487183A ", this
The parameters such as shot peening strength, muzzle velocity degree and the bullet flow that patent uses are improved to some extent, but and nickel-base high-temperature
Alloy is compared, and the intensity of titanium alloy is slightly lower, thus the more excellent shot peening strength range of titanium alloy is relatively low compared with nickel base superalloy with suitable
The material deformation characteristics of titanium alloy are answered, realize more preferably shot-peening modified effect.
Compared with prior art, the invention has the following advantages that
1, pellet medium is placed in liquid by wet blasting, during shot-peening, piece surface is made to form one layer of liquid film, bullet
Dust pollution can be avoided with liquids recovery, moreover it is possible to improve the durability of bullet and nozzle.
2, the present invention uses ceramic pellet, and the major advantage of ceramic pellet has: (1) hardness it is high (hardness up to 640HV~
780HV), it deforms small.The high rigidity of ceramic pellet, which both ensure that, to carry out shot peening strengthening to high-intensitive or superhigh intensity components,
Production efficiency is improved again；The lesser deflection of ceramic pellet ensure that the sphericity of ceramic pellets during bead, mention
The high quality stability of components shot-peenings；(2) strengthening effect is better than glass ball, and hardening strength and cast steel ball are suitable, but raw
At surface roughness to be significantly lower than cast steel ball, while will not also remain iron-containing impurity in component surface, be not likely to produce
Iron pollution makes it react generation corrosion with by spray material；And under identical shot peening strength, glass ball is higher than the speed of ceramic pellet
Very much, this just makes the percentage of damage of ceramic pellet far below glass ball, therefore strengthening effect is more stable, and production cost is lower；(3) surface
Finish is high, cleaning, environmental protection, this is the maximum bright spot that ceramic pellet is better than other blasting medias, ceramic pellet as ceramic material both
It is not easy to react with metal parts, also not vulnerable to the influence of external environment, not only ensure that the finish of itself, but also will not be right
Metal parts generate corrosion, while again since its percentage of damage is low, the dust of generation is few, and environment is cleaner, and visibility is higher,
Reduce the harm to operator's body, is a kind of clean and environment-friendly blasting media.
3, compared with conventional dry shot-peening, the fatigue life of titanium alloy can be improved 10~20 times by wet blasting.
4, compared with traditional dry shot-peening, washing away for water can be to avoid bullet and material with lubricating action in wet blasting technique
Between dry friction, and reversed drag effects of the bullet after it will receive water and water before hitting plate and hit plate, velocity of shot meeting
Therefore it reduces, thus specimen surface finish is higher after wet blasting processing, caused by can reducing because of surface roughness increase
Problem of stress concentration.
5, compared with traditional dry shot-peening, the water in wet blasting medium has cooling effect to by spray material surface, avoids titanium
Scorch occurs during shot-peening for alloy, generation spark leads to the generation of α phase embrittlement, improves the mechanics of materials
Can, the shot-blast process parameter field for effectively improving its fatigue behaviour, widening titanium alloy.
6, titanium alloy belongs to close-packed hexagonal (HCP) crystal structure, and plastic deformation ability is poor, compared with conventional dry shot-peening,
Wet blasting reduces the strain rate of titanium alloy during shot-peening using the buffer function of water, makes its surface that generation micro-crack etc. be avoided to lack
It falls into.
7, compared with conventional dry shot-peening is by air pressurized bullet, wet blasting relies on water flow ACCELERATING PROJECTILE, it is easier to obtain
Required velocity of shot, the blending agent of wet blasting make material surface load be evenly distributed, and material surface tissue obtains ideal
Residual stress field and institutional framework.
8, compared with heat treatment method, using wet blasting technique not only operation is simple can also improve material surface
Improve mantle micro structure while intensity.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
A kind of wet blasting surface modifying method suitable for titanium alloy, using following steps:
Step 1: requiring according to element size specifications and characteristics, determines that target shot peening strength and target coverage rate etc. spray
Ball parameter；
Step 2: removing surface is carried out to sample or part, it is ensured that there is no greasy dirt or other pollutants；
Step 3: sample or part are checked, it is ensured that process before shot-peening is all in place；
Step 4: carrying out clamping to part, carries out package plug to components with adhesive tape or rubber skin and blocks up, protection is unable to shot-peening
Position；
Step 5: carrying out wet blasting processing using JY-120WB liquid shot-blasting machine, the intensity of the ceramic pellet used for
0.25mmC~0.3mmC, specification are selected referring to HBZ 26-2011, and the mass ratio of wet blasting Shi Shuiyu ceramic pellet is 5:1,
The initial velocity that ceramic pellet is dished out from compressed air shotblasting machine is 22m/s~40m/s, and flow is 0.65kg/min~0.8kg/min, and is controlled
The nozzle nickel base superalloy component surface distance of compressed air shotblasting machine processed is 40mm~49mm, air pressure be 0.8MPa~
Under conditions of 1.0MPa, wet blasting handles 11min~12min, and the spray angle of ceramic pellet is 70 °~90 °, and shot-peening coverage rate is
100%.Bead under above-mentioned technological parameter can introduce bigger, deeper residual compressive stress field, table on titanium alloy surface layer
The depth of face modified layer is also bigger, and for conventional dry shot-peening, wet blasting technique can be more effectively disclosed in this patent
Inhibit forming core and the extension of fatigue crack, introduced residual compressive stress field can reduce fatigue crack growth rate, to mention
The anti-fatigue performance of high material.But when the technological parameters such as shot peening strength are more than the range of this patent, due to bullet impact energy
Excessively high the defects of material surface being made to fold, increases material surface roughness, since the excessively high generation spark of frictional heat leads to α
Mutually embrittlement, reduces its surface integrity grade, is unfavorable for the improvement of its fatigue behaviour.Further, since the material hardness of titanium alloy,
The mechanical properties such as yield strength and tensile strength are higher than aluminium lithium alloy, and titanium alloy belongs to close-packed hexagonal (HCP) crystal knot
Structure, the slip system that can be started in deformation process is less, and under the effect of identical plus load, titanium alloy deformation is more difficult.Cause
This, compared to processing aluminium lithium alloy, the parameters such as shot peening strength, muzzle velocity degree and the bullet flow of use have a degree of mention
Height, but compared with nickel base superalloy, the intensity of titanium alloy is slightly lower, thus the more excellent more Ni-based height of shot peening strength range of titanium alloy
The relatively low material deformation characteristics to adapt to titanium alloy of temperature alloy realize more preferably shot-peening modified effect；
Step 6: sample or part are unloaded from equipment after the completion of shot-peening；
Step 7: to after shot-peening sample or part check, guarantee the broken pellet that is not embedded in of surface, do not knock
It damages, the coverage rate and appearance on surface meet technical requirements；
Step 8: 15 DEG C~17 DEG C at a temperature of drying bead after components, after the completion of shot-peening extremely by workpiece
In ventilation drying at room temperature.
It is more specifical embodiment below.
Embodiment 1:
A kind of wet blasting surface modifying method suitable for titanium alloy, using following steps:
Step 1: requiring according to element size specifications and characteristics, determines that target shot peening strength and target coverage rate etc. spray
Ball parameter；
Step 2: removing surface is carried out to sample or part, it is ensured that there is no greasy dirt or other pollutants；
Step 3: sample or part are checked, it is ensured that process before shot-peening is all in place；
Step 4: carrying out clamping to part, carries out package plug to components with adhesive tape or rubber skin and blocks up, protection is unable to shot-peening
Position；
Step 5: carrying out wet blasting processing using JY-120WB liquid shot-blasting machine, the intensity of the ceramic pellet used for
0.25mmC, specification are selected referring to HBZ 26-2011, and the mass ratio of wet blasting Shi Shuiyu ceramic pellet is 5:1, ceramic pellet from
The initial velocity dished out in compressed air shotblasting machine is 22m/s, flow 0.65kg/min, and controls the nozzle nickel base superalloy of compressed air shotblasting machine
Component surface distance is 40mm, and under conditions of air pressure is 0.8MPa, wet blasting handles 11min, the injection of ceramic pellet
Angle is 70 °, and shot-peening coverage rate is 100%；
Step 6: sample or part are unloaded from equipment after the completion of shot-peening；
Step 7: to after shot-peening sample or part check, guarantee the broken pellet that is not embedded in of surface, do not knock
It damages, the coverage rate and appearance on surface meet technical requirements；
Step 8: 15 DEG C at a temperature of drying bead after components, by workpiece as ventilation after the completion of shot-peening
Locate drying at room temperature.
Embodiment 2:
A kind of wet blasting surface modifying method suitable for titanium alloy, using following steps:
Step 1: requiring according to element size specifications and characteristics, determines that target shot peening strength and target coverage rate etc. spray
Ball parameter；
Step 2: removing surface is carried out to sample or part, it is ensured that there is no greasy dirt or other pollutants；
Step 3: sample or part are checked, it is ensured that process before shot-peening is all in place；
Step 4: carrying out clamping to part, carries out package plug to components with adhesive tape or rubber skin and blocks up, protection is unable to shot-peening
Position；
Step 5: carrying out wet blasting processing using JY-120WB liquid shot-blasting machine, the intensity of the ceramic pellet used for
0.28mmC, specification are selected referring to HBZ 26-2011, and the mass ratio of wet blasting Shi Shuiyu ceramic pellet is 5:1, ceramic pellet from
The initial velocity dished out in compressed air shotblasting machine is 30m/s, flow 0.7kg/min, and controls the nozzle nickel base superalloy of compressed air shotblasting machine
Component surface distance is 45mm, and under conditions of air pressure is 0.9MPa, wet blasting handles 11min, the injection of ceramic pellet
Angle is 80 °, and shot-peening coverage rate is 100%；
Step 6: sample or part are unloaded from equipment after the completion of shot-peening；
Step 7: to after shot-peening sample or part check, guarantee the broken pellet that is not embedded in of surface, do not knock
It damages, the coverage rate and appearance on surface meet technical requirements；
Step 8: 16 DEG C at a temperature of drying bead after components, by workpiece as ventilation after the completion of shot-peening
Locate drying at room temperature.
Embodiment 3:
A kind of wet blasting surface modifying method suitable for titanium alloy, using following steps:
Step 1: requiring according to element size specifications and characteristics, determines that target shot peening strength and target coverage rate etc. spray
Ball parameter；
Step 2: removing surface is carried out to sample or part, it is ensured that there is no greasy dirt or other pollutants；
Step 3: sample or part are checked, it is ensured that process before shot-peening is all in place；
Step 4: carrying out clamping to part, carries out package plug to components with adhesive tape or rubber skin and blocks up, protection is unable to shot-peening
Position；
Step 5: carrying out wet blasting processing using JY-120WB liquid shot-blasting machine, the intensity of the ceramic pellet used for
0.3mmC, specification are selected referring to HBZ 26-2011, and the mass ratio of wet blasting Shi Shuiyu ceramic pellet is 5:1, and ceramic pellet is from spray
The initial velocity dished out in ball machine is 40m/s, flow 0.8kg/min, and controls the nozzle nickel base superalloy zero of compressed air shotblasting machine
Parts surface distance is 49mm, and under conditions of air pressure is 1.0MPa, wet blasting handles 12min, the jet angle of ceramic pellet
Degree is 90 °, and shot-peening coverage rate is 100%；
Step 6: sample or part are unloaded from equipment after the completion of shot-peening；
Step 7: to after shot-peening sample or part check, guarantee the broken pellet that is not embedded in of surface, do not knock
It damages, the coverage rate and appearance on surface meet technical requirements；
Step 8: 17 DEG C at a temperature of drying bead after components, by workpiece as ventilation after the completion of shot-peening
Locate drying at room temperature.
Embodiment 4:
It is wet that ceramic pellet (B60,125~250 μm of bullet diameter) progress is respectively adopted to TC4 titanium alloy La-drawing fatigue testing specimen
Bead blasted surfaces modification and cast steel ball (S230,0.5~1.0mm of bullet diameter) carry out dry bead blasted surfaces modification.Wet shot
The shot-peening coverage rate of ball is 200%, shot peening strength 0.3mmN, and wet blasting processing carries out on JY-120WB liquid shot-blasting machine,
Treatment process parameter is same as Example 1；The shot-peening coverage rate of dry shot-peening is 200%, shot peening strength 0.1mmA, at dry shot-peening
Reason carries out (1mmA=3mmN) on MP15000 numerical control compressed air shotblasting machine.
Surface roughness test, residual stress test and microhardness are carried out to the sample after dry shot-peening and wet blasting respectively
Test, and gain effect of the sample fatigue behaviour compared to original state after more dry shot-peening and wet blasting processing.
Specimen surface roughness under different shot-blast processes, dry shot-peening examination are measured using New View5022 type surface profiler
The surface roughness of sample is Ra=1.17 μm, and the surface roughness of wet blasting sample is Ra=0.67 μm.Shot-peening will increase sample
Surface roughness, but under identical shot peening strength, the surface roughness of wet blasting sample is smaller, can effectively reduce stress collection intermediate range
Degree.
Using the residual stress field distribution situation on PROTO-LXRD residual stress instrument measurement sample surface layer, test uses Cu/K
α target measures (213) diffraction crystal face of sample, in conjunction with sample surface layer after the dry shot-peening of electrobrightening delamination measurement and wet blasting processing
Residual stress field distribution situation, breakaway corrosion reagent be 2%HF+4%HNO3+ 94%H2O (volume ratio).Residual stress test
The results are shown in Table 1.
Using HVS-1000 type microhardness testers test sample surface microhardness value, experiment load is 500g, when protecting load
Between be 15s.The surface microhardness value of dry shot-peening sample is 350HV, and wet blasting specimen surface microhardness value is 425HV.
Wet blasting processing can obtain the surface microhardness value bigger than dry shot-peening, and drawing hardening effect becomes apparent from, and can effectively improve material
Expect surface strength, is conducive to the fatigue behaviour for improving sample.
The fatigue limit that sample under different shot-blast processes is measured on SDS-100 electo hydraulic servocontrolled fatigue testing machine, was tested
Cheng Zhong, stress ratio R=0.1, Loaded contact analysis are sine wave, and loading frequency is f=20~30Hz.The fatigue limit of dry shot-peening sample
For 610MPa, (fatigue limit of original sample is 580MPa, and 5.17%) fatigue limit increases compared to original sample, wet blasting
The fatigue limit of sample is 650MPa (fatigue limit increases by 12% compared to original sample).It can be seen that wet blasting can obtain
Surface modification effect more better than dry shot-peening is obtained, the fatigue behaviour of material is effectively improved.
1 TC4 titanium alloy of table is dry, residual stress field distribution under wet blasting technique
Embodiment 5:
To TC17 titanium alloy La-drawing fatigue testing specimen be respectively adopted ceramic pellet (B40) carry out wet blasting surface modification treatment and
Cast steel ball (S230) carries out dry bead blasted surfaces modification.The shot-peening coverage rate of wet blasting is 200%, and shot peening strength is
0.42mmN, wet blasting processing carry out on JY-120WB liquid shot-blasting machine, and treatment process parameter is same as Example 2；Dry shot-peening
Shot-peening coverage rate be 200%, shot peening strength 0.14mmA, dry bead carries out on MP15000 numerical control compressed air shotblasting machine
(1mmA=3mmN).
Surface roughness test, residual stress test and microhardness are carried out to the sample after dry shot-peening and wet blasting respectively
Test, and gain effect of the sample fatigue behaviour compared to original state after more dry shot-peening and wet blasting processing.
Specimen surface roughness under different shot-blast processes, original sample are measured using New View5022 type surface profiler
Surface roughness be Ra=0.36 μm, the surface roughness of dry shot-peening sample is Ra=1.10 μm, the surface of wet blasting sample
Roughness is Ra=0.90 μm.Shot-peening will increase specimen surface roughness, but under identical shot peening strength, the table of wet blasting sample
Surface roughness is smaller, can effectively reduce surface stress intensity.
Using the residual stress field distribution on PROTO-LXRD residual stress instrument measurement sample surface layer, test uses Cu/K α target,
(213) diffraction crystal face of sample is measured, tube voltage 40kV, tube current 30mA, 4 °/min of scanning speed, most 0.04 ° of small step angle are swept
5 °~100 ° of range are retouched, the residual stress field point on sample surface layer after dry shot-peening and wet blasting processing is measured in conjunction with electrobrightening delamination
Cloth situation, breakaway corrosion reagent are 2%HF+4%HNO3+ 94%H2O (volume ratio).The results are shown in Table 2 for residual stress test.
Using HVS-1000 type microhardness testers test sample surface microhardness value, experiment load is 500g, when protecting load
Between be 15s.Original sample surface microhardness is 340HV, and the surface microhardness value of dry shot-peening sample is 390HV, and wet shot
Ball specimen surface microhardness value is 455HV.Wet blasting processing can obtain the surface microhardness value bigger than dry shot-peening, process
Hardening effect becomes apparent from, and can effectively improve material surface intensity, is conducive to the fatigue behaviour for improving sample.
The fatigue limit that sample under different shot-blast processes is measured on SDS-100 electo hydraulic servocontrolled fatigue testing machine, was tested
Cheng Zhong, stress ratio R=0.1, Loaded contact analysis are sine wave, and loading frequency f=20Hz, condition number of stress cycles is 2 × 106。
The fatigue strength of original sample is 610MPa, and the fatigue limit of dry shot-peening sample is that (fatigue limit is compared to original examination by 630MPa
3.29%) sample increases, the fatigue limit of wet blasting sample is that (fatigue limit increases 690MPa compared to original sample
13.11%).It can be seen that wet blasting can obtain surface modification effect more better than dry shot-peening.
2 TC4 titanium alloy of table is dry, residual stress field distribution under wet blasting technique
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (10)
1. a kind of wet blasting surface modifying method suitable for titanium alloy, which is characterized in that this method uses following steps:
(1) removing surface is carried out to titanium alloy components, it is stifled to carry out package plug to the position for being unable to shot-peening；
(2) wet blasting processing carried out to titanium alloy components using ceramic pellet and water, the mass ratio of water and ceramic pellet is 5:1；
(3) to wet blasting, treated that titanium alloy components are dried.
2. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
Control air pressure is 0.8MPa~1.0MPa when ball processing.
3. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
The control processing time is 11min~12min when ball processing.
4. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
The initial velocity that ceramic pellet is dished out from compressed air shotblasting machine when ball processing is 22m/s~40m/s.
5. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
The flow of ceramic pellet is 0.65kg/min~0.8kg/min when ball processing.
6. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
The nozzle nickel base superalloy component surface distance of compressed air shotblasting machine is 40mm~49mm when ball processing.
7. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
When ball processing, the spray angle of ceramic pellet is 70 °~90 °, and shot-peening coverage rate is 100%.
8. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
When ball processing, the intensity of the ceramic pellet used is 0.25mmC~0.3mmC.
9. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that wet shot
When ball processing, the specification of the ceramic pellet of use is selected referring to HBZ26-2011.
10. a kind of wet blasting surface modifying method suitable for titanium alloy according to claim 1, which is characterized in that spray
Titanium alloy components are placed in the processing of ventilation drying at room temperature after the completion of ball, temperature control is 15 DEG C~17 DEG C.
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| CN111621629A (en) * | 2020-06-29 | 2020-09-04 | 安徽天航机电有限公司 | Shot blasting process for nut surface strengthening |
| CN113334256A (en) * | 2021-06-11 | 2021-09-03 | 贵州永红航空机械有限责任公司 | Method for cleaning nickel-based high-temperature alloy before welding |
| CN114161322A (en) * | 2021-12-13 | 2022-03-11 | 中船重工龙江广瀚燃气轮机有限公司 | Blade composite surface strengthening method |
| CN115595522A (en) * | 2022-09-27 | 2023-01-13 | 东北电力大学（Cn） | Device and method for pre-coupling pulse current and pulse magnetic field assisted shot blasting |
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Application publication date: 20190716 |