CN106755860B - A kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding - Google Patents
A kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding Download PDFInfo
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- CN106755860B CN106755860B CN201611141451.2A CN201611141451A CN106755860B CN 106755860 B CN106755860 B CN 106755860B CN 201611141451 A CN201611141451 A CN 201611141451A CN 106755860 B CN106755860 B CN 106755860B
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- Prior art keywords
- peening
- water jet
- nitriding
- sample
- plasma
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Classifications
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
Abstract
The invention discloses the combined processing surface modifying methods of a kind of water jet shot-peening and plasma nitriding, then the method carries out plasma nitrided composite treatment technology again for needing the part for carrying out plasma nitrided surface peening first to carry out the accurate high-pressure water jet shot peening strengthening in surface before plasma nitrided.The present invention significantly improves the quality and thickness of sample nitriding layer using high-pressure water jet shot-peening and plasma nitriding compounding method, and it efficiently solves single uneven using partial nitridation layer existing for plasma nitriding technology, the problems such as even nitration case missing, nitridation depth is inadequate.Therefore, the present invention not only increases nitriding layer quality, and nitrided case depth is made to increase above 100 μm, while the hardness of specimen surface being made to increase substantially, and acquisition acquisition hardness gradient is reasonably distributed and the uniform nitriding layer of diffusion layer organization.
Description
Technical field
The present invention relates to the combined processing surface modifying methods of a kind of water jet shot-peening and plasma nitriding, belong to metal watch
Face technical field of modification.
Background technology
Plasma nitriding technology is common pinion steel surface modifying method, is remarkably improved the case hardness of material, resistance to
Mill property and fatigue behaviour have been widely used in as a kind of widely used Surface heat-treatent technology in industrial production.
Plasma nitriding technology mainly generates activated nitrogen atom by way of cathodic sputtering, is enriched in specimen surface, constantly to base
Internal portion's diffusion, ultimately forms the nitriding layer being made of surface layer nitride layer, white layer, secondary surface layer diffusion layer.However, the portion of plasma nitriding
The problems such as dividing infiltration layer, there are uneven or even nitriding layers to lack, and nitridation depth is inadequate.
For high-pressure water jet shot-peening as the surface technology for modifying grown rapidly in recent years, principle is will be high
Pressure pure water is ejected into material surface, can hardly destroy material surface integrality, also not limited by workpiece shapes factor, material
Surface generates plastic deformation below recrystallization temperature, to material surface modifying by way of processing hardening, dislocation strengthening.But
Have no the technology and the composite treatment process that plasma nitriding combines.
Invention content
Part infiltration layer in order to solve above-mentioned plasma nitriding nitrogenizes depth not there are uneven or even nitriding layer missing
The problems such as enough, the present invention provides a kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding, existing to overcome
There is the deficiency of technology.
Technical scheme of the present invention：A kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding, packet
Include following steps：
(1) it will be cleaned by ultrasonic and dried in absolute ethyl alcohol after sample progress modifier treatment；
(2) sample is fixed on objective table, will be vertically sprayed after pure water boost in pressure to 100~350MPa in high-voltage tube
To specimen surface, water jet shot-peening pretreatment is carried out to sample；
(3) pretreated sample is placed in ionic nitriding equipment, ammonia, air pressure is passed through after being evacuated to 15Pa or less
200Pa is kept, furnace temperature is increased to 500~560 DEG C, then carry out plasma nitrided surface processing, soaking time is 6~8h, place
Room temperature is cooled to the furnace after the completion of reason.
In the above method, the sample by containing weight percent calculating be containing Cr0.5~1.5%, Mo0.1~
0.5%, Al0.05~0.2, the elements of V0.05~0.15% high-quality alloy steel.
In the above method, the modifier treatment described in step (1) is：First it is warming up to 840 DEG C of heat preservation 15min, oil cooling to room
Temperature, then 580 DEG C of heat preservation 1h are warming up to, it is air-cooled to room temperature.
Further, the cleaning described in step (1) and drying are that sample is carried out ultrasonic cleaning in absolute ethyl alcohol
Then 15min is dried.
In the above method, nozzle diameter 0.2 used by the pretreatment of water jet shot-peening described in step (2)~it is 0.4mm,
Away from 5~15mm of specimen surface, 200~500mm/min of nozzle movement speed.
Due to the adoption of the above technical scheme, the advantage of the invention is that：The present invention using high-pressure water jet shot-peening and it is equal from
The core of sub- nitriding compounding method is that accurate high-pressure water jet bead is first carried out before plasma nitrided, makes examination
Sample, workpiece surface generate prodigious cold deformation, are significantly refined so as to cause mantle micro structure and form a large amount of dislocation tangles
And dislocation cell structure, interface dramatically increase.Since this deformation layer is completed under determining deformation parameter, surface layer deformation thickness
Uniformly, thus cause the quickening of nitridation process nitrogen-atoms diffusion rate, uniformity to dramatically increase, and efficiently solve single use etc.
The problems such as partial nitridation layer existing for glow discharge nitriding technology is uneven or even nitration case lacks, and nitridation depth is inadequate.Therefore, originally
Invention not only increases nitriding layer quality, so that nitrided case depth is increased above 100 μm, while making the hardness of specimen surface significantly
It improves, acquisition acquisition hardness gradient is reasonably distributed and the uniform nitriding layer of diffusion layer organization.
Description of the drawings
Fig. 1 is middle carbon chromium, molybdenum steel using plasma nitriding treated infiltration layer micro-organization chart；
Fig. 2 is middle carbon chromium, molybdenum steel using the method for the present invention treated infiltration layer micro-organization chart；
Fig. 3 is that middle carbon chromium, molybdenum steel handle and use the hardness gradient of the method for the present invention processing to change using plasma nitriding
Comparison diagram.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and examples to this hair
It is bright to be described in further detail.
Embodiment
1) middle carbon chromium, the molybdenum steel of original state are processed into the sample of size 10mm × 10mm × 10mm；
2) sample is modulated processing, is first warming up to 840 DEG C of heat preservation 15min, oil cooling is to room temperature, then is warming up to 580 DEG C
1h is kept the temperature, room temperature is air-cooled to；
3) it is mechanically polished to minute surface after sample being polished with 0#~7# abrasive paper for metallograph respectively；
4) sample is immersed in absolute ethyl alcohol for use after carrying out ultrasonic cleaning 15min, drying；
5) sample is fixed on objective table, carries out high-pressure water jet shot-peening pretreatment, hydraulic pressure 100MPa, nozzle diameter
Vertical to spray for 0.33mm, nozzle distance specimen surface 10mm, nozzle movement speed 500mm/min, water sprays twice；
6) plasma nitriding processing is carried out at the same time to original sample and water shot-peening pretreating specimen.Two kinds of samples are placed in
It in glow discharge nitriding equipment, is evacuated to and is passed through ammonia less than 15Pa, ammonia flow is automatically controlled by flow controller to ensure stove
Pressure is stablized in 200Pa, and 530 DEG C of furnace temperature is controlled, and room temperature is cooled to the furnace after keeping the temperature 8h.
Referring to Fig. 1 and Fig. 2, middle carbon chromium, molybdenum steel use merely plasma nitriding to handle and use water jet spray test result
Ball is compared with plasma nitriding combined processing, and the latter's nitride layer, white layer thickness obviously increases, and infiltration layer uniformity improves, and vein structure subtracts
Few, quality layer is substantially better than the former.From the figure 3, it may be seen that the nitriding layer hardness gradient distribution of combined processing is more reasonable, infiltration layer is thick
Degree increases above 100 μm.
Claims (5)
1. the combined processing surface modifying method of a kind of water jet shot-peening and plasma nitriding, it is characterised in that including following step
Suddenly：
(1) it will be cleaned by ultrasonic and dried in absolute ethyl alcohol after sample progress modifier treatment；
(2) sample is fixed on objective table, will be vertically ejected into examination after pure water boost in pressure to 100~350MPa in high-voltage tube
Sample surface carries out water jet shot-peening pretreatment to sample；
(3) pretreated sample is placed in ionic nitriding equipment, is passed through ammonia after being evacuated to 15Pa or less, air pressure is kept
Furnace temperature is increased to 500~560 DEG C, then carries out plasma nitrided surface processing by 200Pa, and soaking time is 6~8h, has been handled
Cool to room temperature with the furnace after.
2. the combined processing surface modifying method of water jet shot-peening according to claim 1 and plasma nitriding, feature
It is：The sample by containing weight percent calculating be containing Cr0.5~1.5%, Mo0.1~0.5%, Al0.05~0.2,
The high-quality alloy steel of the elements of V0.05~0.15%.
3. the combined processing surface modifying method of water jet shot-peening according to claim 1 and plasma nitriding, feature
It is：Modifier treatment described in step (1) is：840 DEG C of heat preservation 15min are first warming up to, oil cooling is to room temperature, then is warming up to 580
DEG C heat preservation 1h, be air-cooled to room temperature.
4. the combined processing surface modifying method of water jet shot-peening according to claim 1 and plasma nitriding, feature
It is：Cleaning and drying described in step (1) are that sample is carried out to ultrasonic cleaning 15min in absolute ethyl alcohol, are then dried
It is dry.
5. the combined processing surface modifying method of water jet shot-peening according to claim 1 and plasma nitriding, feature
It is：Nozzle diameter 0.2 used by the pretreatment of water jet shot-peening described in step (2)~it is 0.4mm, away from specimen surface 5~
15mm, 200~500mm/min of nozzle movement speed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611141451.2A CN106755860B (en) | 2016-12-12 | 2016-12-12 | A kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611141451.2A CN106755860B (en) | 2016-12-12 | 2016-12-12 | A kind of combined processing surface modifying method of water jet shot-peening and plasma nitriding |
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| CN106755860A CN106755860A (en) | 2017-05-31 |
| CN106755860B true CN106755860B (en) | 2018-09-25 |
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| CN111945101A (en) * | 2020-07-24 | 2020-11-17 | 中国航发北京航空材料研究院 | Composite surface layer modification method for improving thermal stability of part surface deformation strengthening layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889105A (en) * | 2007-12-20 | 2010-11-17 | 沓名宗春 | Surface modification method and cover |
| CN102877070A (en) * | 2012-06-14 | 2013-01-16 | 浙江吉利汽车研究院有限公司杭州分公司 | Surface compound treatment method for steel mould |
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- 2016-12-12 CN CN201611141451.2A patent/CN106755860B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889105A (en) * | 2007-12-20 | 2010-11-17 | 沓名宗春 | Surface modification method and cover |
| CN102877070A (en) * | 2012-06-14 | 2013-01-16 | 浙江吉利汽车研究院有限公司杭州分公司 | Surface compound treatment method for steel mould |
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