CN105803449A - Metal surface acute deformation alloying method - Google Patents
Metal surface acute deformation alloying method Download PDFInfo
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- CN105803449A CN105803449A CN201610359455.1A CN201610359455A CN105803449A CN 105803449 A CN105803449 A CN 105803449A CN 201610359455 A CN201610359455 A CN 201610359455A CN 105803449 A CN105803449 A CN 105803449A
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- Prior art keywords
- metal
- alloying
- mechanical deformation
- metal surface
- test button
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- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
Abstract
The invention discloses a metal surface acute deformation alloying method. The metal surface acute deformation alloying method is characterized by comprising the following steps: (1) the surface of a metal sample is pretreated; (2) alloying metal powder is uniformly applied on the surface of the metal sample; (3) an impact device is adopted to continuously impact the surface of the metal sample; (4) the alloying metal powder is uniformly applied on the impacted surface of the metal sample; and (5) the metal sample is put in a vacuum annealing furnace for return treatment. The metal surface acute deformation alloying method is simple in process, is controllable in impact force in the punching process, can form higher residual compressive stress on the surface, facilitates prevention of cracks, and prolongs the service life.
Description
Technical field
The method that the present invention relates to a kind of metal surface drastic mechanical deformation alloying, belongs to metal material surface working hardening technical field.
Background technology
The inefficacy of metallic material components is originating primarily from surface, therefore it is required that metal material surface has the performance of excellence.Alloying can effectively repair surface, improves performance, such as obdurability, corrosion resistance and wearability.Severe plastic deformation is a kind of emerging Alloying on Metal Planes method, by crystal grain thinning and alloying, and forms compressive stress on surface, hinders generation and the extension of crackle in materials'use process, improve its service life.
Conventional surface severe plastic deformation method includes rolling, mechanical lapping, shot-peening etc., but these methods prepare the alloying layer degree of depth shallower (being generally below 100 μm), alloying level is on the low side, there is other problem simultaneously, as rolling belongs to low-stress state, therefore residual compressive stress numerical value and layer depth are less, and the fatigue strength increase rate of material is less.
Summary of the invention
It is an object of the invention to overcome deficiency of the prior art, it is provided that the method for a kind of metal surface drastic mechanical deformation alloying, solve that Alloying on Metal Planes effect in prior art is low, complex process, inefficient technical problem.
For solving above-mentioned technical problem, the method that the invention provides a kind of metal surface drastic mechanical deformation alloying, it is characterized in that, comprise the following steps:
Step one, carries out pretreatment to the surface of test button；
Step 2, is coated uniformly on the surface of test button by metal of alloying powder；
Step 3, adopts percussion mechanism that the surface of test button is carried out bump process；
Step 4, is coated uniformly on the surface of the test button after impact by metal of alloying powder；
Step 5, puts into test button and carries out reply process in vacuum annealing furnace.
Further, described test button includes carbon steel, steel alloy or non-ferrous metal.
Further, described pretreatment includes being sequentially carried out ethanol purge and surface grinding, grinds point corase grind and a fine grinding, until metal surface cleaning, oxide-free and hardened layer.
Further, described metal of alloying powder includes Cr, Ni, Mo, Ti or metal carbides.
Further, in described step 2, the granular size of metal of alloying powder is 50 ~ 100 μm, and the thickness of coating is 1 ~ 3mm.
Further, the impact energy of shock treatment is 1 ~ 3J, and the frequency of impact is 20 ~ 80 times/second, and the attack time is 5 ~ 30min.
Further, in described step 4, the granular size of metal of alloying powder is 50 ~ 100 μm, and the thickness of coating is 3 ~ 5mm.
Further, the temperature that reply processes is 300 ~ 600 DEG C, and the time is 3 ~ 12 hours.
Compared with prior art, the present invention reaches to provide the benefit that:
1) compared to other wrought alloy method, alloying layer thickness is relatively big, alloying level is higher, simultaneously because impulsive force is controlled, surface can form bigger residual compressive stress, desirably prevents the generation of crackle, increases the service life；
2) present invention can form gradient structure at specimen surface, and most surface layer grain is refined to nanoscale, and comprehensive mechanical property significantly improves；
3) present invention process is simple, improves work efficiency, reduces input cost.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
As it is shown in figure 1, the method for a kind of metal surface drastic mechanical deformation alloying of the present invention, it is characterized in that, comprise the following steps:
Step one, carries out pretreatment to the surface of test button；
Test button includes carbon steel, steel alloy or non-ferrous metal；Pretreatment includes being sequentially carried out ethanol purge and surface grinding process, grinds point corase grind and a fine grinding, until metal surface cleaning, oxide-free and hardened layer；
Step 2, is coated uniformly on the surface of test button by metal of alloying powder；
Metal of alloying powder includes Cr, Ni, Mo, Ti or metal carbides, and the granular size of metal dust is 50 ~ 100 μm, the thickness 1 ~ 3mm of coating metal dust.Metal of alloying powder can adopt immersion plating or snearing method to be coated in the surface of test button；The effect of coating metal dust can make deformation and diffusion of alloy elements carry out when being in that shock treatment simultaneously；
Step 3, adopts percussion mechanism that the surface of test button is carried out bump process；
Utilize percussion mechanism (for the device of metal surface working hardening as disclosed in patent CN2016203990012), material surface is carried out bump severe plastic deformation process, needed for the sample of different metal material, the parameter of shock treatment is different, needed for different working hardening thickness, the parameter of shock treatment is also different, percussion mechanism arranges corresponding impact parameter, the impact energy of shock treatment is 1 ~ 3J, and the frequency of impact is 20 ~ 80 times/second, and the attack time is 5 ~ 30min.Surface can form bigger residual compressive stress simultaneously, desirably prevents the generation of crackle, improves tired cycle, increases the service life；
Step 4, is coated uniformly on the surface of the test button after impact by metal of alloying powder；
The effect of second time coated alloy metal dust is in that to make next step carry out promoting diffusion of alloy elements further in reply heat treatment process, it is prevented from specimen surface oxidation simultaneously, the granular size of metal of alloying powder is 50 ~ 100 μm, and the thickness of coated alloy metal dust is 3 ~ 5mm.
Step 5, puts into test button and carries out reply process in vacuum annealing furnace.
Further, the temperature that reply processes is 300 ~ 600 DEG C, and the time is 3 ~ 12 hours.What reply processed act as: after making deformation on the one hand, metal surface Stress Release and dislocation are mutually moved and formed dislocation born of the same parents' substructure；Can promote that alloying element spreads further on the other hand is conducive to alloying to be formed.
The inventive method technique is simple, improves work efficiency, reduces input cost.
The surface deformation alloying of embodiment 1:20 steel
First, 20 steel boards are cut into the sample of 30mm × 40mm, use acetone that sample is cleaned, remove material surface greasy dirt, clean with clear water, use the sand paper of W20 and W50 to be ground, until material surface is substantially consistent without obvious cut and direction, alcohol washes, dry for standby.Carry out afterwards impacting Alloying Treatment, use impact device to carry out deformation process, clamp sample during use, the Cr powder of 3mm is laid in specimen surface, utilizes percussion mechanism to carry out shock treatment.Cr powder uses and is about the 3.5N(of 75 μm of granularities (200 order) purity representing 99.95%) pure Cr powder.During shock treatment, adopting the drill hammer of radius of curvature 2mm, impact energy is 1J, and the frequency of impact is 80 times/second, and the attack time is about 30min.Finally, spreading the thick Cr powder of one layer of 5mm the 12h that anneals at temperature 300 DEG C at specimen surface, air cooling is to room temperature.
After measured, adopting the inventive method to form the carbide of Fe and Cr solid solution and Cr on 20 steel surfaces, its alloy layer thickness is about 250 μm, and after top layer formation alloy-layer, its tensile strength improves about 20%, and yield strength improves about 24%.
The surface deformation alloying of embodiment 2:Q235 steel
First, Q235 steel board is cut into the sample of 30mm × 40mm, uses acetone that sample is cleaned, remove material surface greasy dirt, clean with clear water, use the sand paper of W20 and W50 to be ground, until material surface is substantially consistent without obvious cut and direction, alcohol washes, dry for standby.Carry out afterwards impacting Alloying Treatment, use impact device to carry out deformation process, clamp sample during use, the Cr powder of 1mm is laid in specimen surface, use impact head that specimen surface is impacted.Cr powder uses and is about the 3.5N(of 75 μm of granularities (200 order) purity representing 99.95%) pure Cr powder.During shock treatment, adopting the drill hammer of 2mm, impact energy is 3J, and the frequency of impact is 20 times/second, impacts about 5min.Finally, spreading the thick Cr powder of one layer of 3mm the 3h that anneals at temperature 600 DEG C at specimen surface, air cooling is to room temperature.
After measured, adopting the inventive method to form the carbide of Fe and Cr solid solution and Cr on Q235 steel surface, its alloy layer thickness is about 230 μm, and after top layer formation alloy-layer, its tensile strength improves about 14%, and yield strength improves about 20%.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.
Claims (8)
1. a method for metal surface drastic mechanical deformation alloying, is characterized in that, comprises the following steps:
Step one, carries out pretreatment to the surface of test button；
Step 2, is coated uniformly on the surface of test button by metal of alloying powder；
Step 3, adopts percussion mechanism that the surface of test button is carried out bump process；
Step 4, is coated uniformly on the surface of the test button after impact by metal of alloying powder；
Step 5, puts into test button and carries out reply process in vacuum annealing furnace.
2. the method for a kind of metal surface according to claim 1 drastic mechanical deformation alloying, is characterized in that, described test button includes carbon steel, steel alloy or non-ferrous metal.
3. the method for a kind of metal surface according to claim 1 drastic mechanical deformation alloying, is characterized in that, described pretreatment includes being sequentially carried out ethanol purge and surface grinding, grinds point corase grind and a fine grinding.
4. the method for a kind of metal surface according to claim 1 drastic mechanical deformation alloying, is characterized in that, described metal of alloying powder includes Cr, Ni, Mo, Ti or metal carbides.
5. the method for a kind of metal surface according to claim 4 drastic mechanical deformation alloying, is characterized in that, further, in described step 2, the granular size of metal of alloying powder is 50 ~ 100 μm, and the thickness of coating is 1 ~ 3mm.
6. the method for a kind of metal surface according to claim 1 drastic mechanical deformation alloying, is characterized in that, the impact energy of shock treatment is 1 ~ 3J, and the frequency of impact is 20 ~ 80 times/second, and the attack time is 5 ~ 30min.
7. the method for a kind of metal surface according to claim 4 drastic mechanical deformation alloying, is characterized in that, in described step 4, the granular size of metal of alloying powder is 50 ~ 100 μm, and the thickness of coating is 3 ~ 5mm.
8. the method for a kind of metal surface according to claim 1 drastic mechanical deformation alloying, is characterized in that, the temperature that reply processes is 300 ~ 600 DEG C, and the time is 3 ~ 12 hours.
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| CN201610359455.1A CN105803449A (en) | 2016-05-27 | 2016-05-27 | Metal surface acute deformation alloying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191395A (en) * | 2016-08-15 | 2016-12-07 | 江苏大学 | A kind of high-current pulsed electron beam irradiation 20 steel method for alloying surface |
| CN109570238A (en) * | 2018-10-30 | 2019-04-05 | 南京工程学院 | A kind of roll surface roughness strengthens and optimal control method |
Citations (4)
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| FR2698885A1 (en) * | 1992-12-04 | 1994-06-10 | Inst Nat Polytech Grenoble | Surface hardening of metal substrates - by coating with dispersion of ceramic particles and exposing to concentrated energy beam |
| CN102912340A (en) * | 2012-10-15 | 2013-02-06 | 秦皇岛格瑞得节能技术服务有限公司 | Preparation method for high temperature impact wear resistant gradient composite material |
| CN105349991A (en) * | 2015-11-25 | 2016-02-24 | 南京工程学院 | Preparing method for surface layer gradient alloy steel material based on bionic structure |
| CN105386034A (en) * | 2015-11-25 | 2016-03-09 | 南京工程学院 | Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material |
-
2016
- 2016-05-27 CN CN201610359455.1A patent/CN105803449A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2698885A1 (en) * | 1992-12-04 | 1994-06-10 | Inst Nat Polytech Grenoble | Surface hardening of metal substrates - by coating with dispersion of ceramic particles and exposing to concentrated energy beam |
| CN102912340A (en) * | 2012-10-15 | 2013-02-06 | 秦皇岛格瑞得节能技术服务有限公司 | Preparation method for high temperature impact wear resistant gradient composite material |
| CN105349991A (en) * | 2015-11-25 | 2016-02-24 | 南京工程学院 | Preparing method for surface layer gradient alloy steel material based on bionic structure |
| CN105386034A (en) * | 2015-11-25 | 2016-03-09 | 南京工程学院 | Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material |
Non-Patent Citations (1)
| Title |
|---|
| XIANGYANG MAO ET AL.: "A study on nanoscale gradient alloying induced by punching deformation process on low carbon steel", 《MATERIALS LETTERS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191395A (en) * | 2016-08-15 | 2016-12-07 | 江苏大学 | A kind of high-current pulsed electron beam irradiation 20 steel method for alloying surface |
| CN109570238A (en) * | 2018-10-30 | 2019-04-05 | 南京工程学院 | A kind of roll surface roughness strengthens and optimal control method |
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Application publication date: 20160727 |