CN105821370A - Ion nitriding process for simplifying production process of hydraulic plunger - Google Patents
Ion nitriding process for simplifying production process of hydraulic plunger Download PDFInfo
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- CN105821370A CN105821370A CN201610188185.2A CN201610188185A CN105821370A CN 105821370 A CN105821370 A CN 105821370A CN 201610188185 A CN201610188185 A CN 201610188185A CN 105821370 A CN105821370 A CN 105821370A
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- China
- Prior art keywords
- hydraulic plunger
- sample
- furnace
- ion nitriding
- glow discharge
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Classifications
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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
- 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
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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
- 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
- C23C8/02—Pretreatment of the material to be coated
Abstract
The invention relates to an ion nitriding process for simplifying the production process of a hydraulic plunger. The ion nitriding process comprises the following steps that original steel is subjected to quenching and tempering; steel subjected to quenching and tempering is machined into a hydraulic plunger sample; the sample is polished, subjected to ultrasonic cleaning in absolute ethyl alcohol and dried; the sample is put into an ion nitriding furnace, the ionic nitriding furnace is vaccumized till the pressure is 18 Pa or below, hydrogen is introduced for sputtering for 30 min, and the pressure in the furnace is kept at 400 Pa; the temperature of the furnace is raised to 400 DEG C to 490 DEG C, nitrogen is introduced for ion nitriding surface treatment, and the heat preservation time ranges from 4 h to 8 h; and the sample is cooled to room temperature along with the furnace. The ion nitriding process has the beneficial effects that after low-temperature ion nitriding treatment is adopted, basically no brittle white bright layer is formed on the surface of the 38CrMoAl hydraulic plunger; and by means of low-temperature ion nitriding treatment, a grinding procedure of the 38CrMoAl hydraulic plunger can be omitted, and therefore the production process is simplified, the production efficiency is improved, and the manufacturing cost is reduced.
Description
Technical field
The present invention relates to a kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure.
Background technology
38CrMoAl steel is hydraulic plunger common used material, owing to hydraulic plunger need to work under conditions of top load, high impact forces, then requires that it has higher hardness, good wear-resisting, impact resistance and fatigue resistance.After coupled columns fills in row glow discharge nitriding process, one layer of nitration case can be formed on its top layer so that it is comprehensive mechanical property improves, thus improves the military service performance of plunger, increases the service life.
But, find in engineer applied and production, use the conventional ion Nitrizing Treatment back-plunger nitride layer, white layer that top layer is formed to have bigger fragility.During post-production and use, easily there is crackle or comes off in nitride layer, white layer, thus the properly functioning of whole hydraulic system is brought adverse effect.The counter-measure taked at present is mainly: supplements grinding after glow discharge nitriding, removes nitride layer, white layer.Owing to nitride layer, white layer hardness is high and fragility is relatively big, Grinding Process is easily generated grinding crack, causes product failure.Meanwhile, the grinding process of increase makes the plunger technological process of production complicated, reduces production efficiency, increases production cost.
Summary of the invention
The technical problem to be solved in the present invention is: based on the problems referred to above, and the present invention provides a kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure.
The present invention solves the technical scheme that its technical problem used: a kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure, comprises the following steps:
(1) original state steel is carried out modifier treatment；
(2) quenched and tempered state steel is cut into hydraulic plunger sample；
(3) sample is carried out grinding process, dehydrated alcohol carries out ultrasonic cleaning, drying；
(4) sample being put into ion nitriding furnace, be evacuated to below 18Pa, be passed through hydrogen sputtering 30min, furnace pressure keeps 400Pa；Furnace temperature being increased to 400～490 DEG C, is passed through nitrogen, carry out the process of glow discharge nitriding surface, temperature retention time is 4～8h；
(5), after nitriding terminates, sample cools to room temperature with the furnace.
Further, step (1) Central Plains primary state steel matter is 38CrMoAl, and modifier treatment is for being first warming up to 850 DEG C of insulation 8min water-cooleds to room temperature, then is warming up to 560 DEG C of insulation 30min water-cooleds to room temperature.
Further, in step (3), grinding process is to be polished by the SiC sand paper of sample 240#～2000#, then uses Cr2O polishing powder is polished to minute surface.
Further, step (4) intermediate ion nitrided surface processes and uses hydrogen and nitrogen mixed gas, nitrogen is 1:3 with the flow-rate ratio of hydrogen, furnace pressure 400Pa.
The invention has the beneficial effects as follows: after (1) uses low temperature plasma nitriding to process, 38CrMoAl hydraulic plunger surface is not substantially formed fragility nitride layer, white layer；(2) low temperature plasma nitriding processes and makes 38CrMoAl hydraulic plunger can save grinding operation, so that the technological process of production simplifies, production efficiency improves, and manufacturing cost reduces.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the infiltration layer micro-organization chart that embodiment 1 obtains；
Fig. 2 is the infiltration layer micro-organization chart that embodiment 2 obtains；
Fig. 3 is the infiltration layer micro-organization chart that embodiment 3 obtains.
Detailed description of the invention
Presently in connection with specific embodiment, the invention will be further described, and following example are intended to illustrate rather than limitation of the invention further.
Embodiment 1
(1) the 38CrMoAl steel to original state carries out modifier treatment, be first warming up to 850 DEG C insulation 8min water-cooleds to room temperature, then be warming up to 560 DEG C insulation 30min water-cooleds to room temperature, then processing cut into hydraulic plunger sample.
(2) the 38CrMoAl hydraulic plunger specimen surface after modifier treatment is polished with the SiC sand paper of 240#～2000# successively, then use Cr2O polishing powder is polished to minute surface.
(3) with dehydrated alcohol, 38CrMoAl hydraulic plunger sample is carried out ultrasonic waves for cleaning, remove specimen surface greasy dirt and impurity, the most stand-by.
(4) 38CrMoAl hydraulic plunger sample being put into LD-8CL type direct-current plasma nitriding furnace, evacuation makes air pressure reach below 18Pa, is passed through hydrogen, and hydrogen sputtering 30min, furnace pressure keeps 400Pa；Being warming up to 490 DEG C, be passed through nitrogen, regulation nitrogen and hydrogen ratio are 1:3, and furnace pressure 400Pa is incubated 4 hours.
(5) sample cools to room temperature with the furnace.
Embodiment 2
(1) the 38CrMoAl steel to original state carries out modifier treatment, be first warming up to 850 DEG C insulation 8min water-cooleds to room temperature, then be warming up to 560 DEG C insulation 30min water-cooleds to room temperature, then processing cut into hydraulic plunger sample.
(2) the 38CrMoAl hydraulic plunger specimen surface after modifier treatment is polished with the SiC sand paper of 240#～2000# successively, then use Cr2O polishing powder is polished to minute surface.
(3) with dehydrated alcohol, 38CrMoAl hydraulic plunger sample is carried out ultrasonic waves for cleaning, remove specimen surface greasy dirt and impurity, the most stand-by.
(4) 38CrMoAl hydraulic plunger sample being put into LD-8CL type direct-current plasma nitriding furnace, evacuation makes air pressure reach below 18Pa, is passed through hydrogen, and hydrogen sputtering 30min, furnace pressure keeps 400Pa；Being warming up to 450 DEG C, be passed through nitrogen, regulation nitrogen and hydrogen ratio are 1:3, and furnace pressure 400Pa is incubated 4 hours.
(5) sample cools to room temperature with the furnace.
Embodiment 3
(1) the 38CrMoAl steel to original state carries out modifier treatment, be first warming up to 850 DEG C insulation 8min water-cooleds to room temperature, then be warming up to 560 DEG C insulation 30min water-cooleds to room temperature, then processing cut into hydraulic plunger sample.
(2) the 38CrMoAl hydraulic plunger specimen surface after modifier treatment is polished with the SiC sand paper of 240#～2000# successively, then use Cr2O polishing powder is polished to minute surface.
(3) with dehydrated alcohol, 38CrMoAl hydraulic plunger sample is carried out ultrasonic waves for cleaning, remove specimen surface greasy dirt and impurity, the most stand-by.
(4) 38CrMoAl hydraulic plunger sample being put into LD-8CL type direct-current plasma nitriding furnace, evacuation makes air pressure reach below 18Pa, is passed through hydrogen, and hydrogen sputtering 30min, furnace pressure keeps 400Pa；Being warming up to 400 DEG C, be passed through nitrogen, regulation nitrogen and hydrogen ratio are 1:3, and furnace pressure 400Pa is incubated 4 hours.
(5) sample cools to room temperature with the furnace.
Fig. 1 is the cross section microscopic structure of embodiment 1, and the continuous nitride layer, white layer of glow discharge nitriding acquisition is about 1um thickness under this condition；Fig. 2 is the cross section microscopic structure of embodiment 2, and glow discharge nitriding is without nitride layer, white layer under this condition；Fig. 3 is the cross section microscopic structure of embodiment 3, and glow discharge nitriding is without nitride layer, white layer under this condition.Contrast finds, under identical temperature retention time, substantially reduces and even disappear at the bottom of the nitride layer, white layer thickness that lower temperature glow discharge nitriding obtains.Therefore, employing carries out glow discharge nitriding less than 500 DEG C, it is possible to obtain few modified infiltration layer without nitride layer, white layer.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, relevant staff can carry out various change and amendment completely in the range of without departing from this invention technological thought.The content that the technical scope of this invention is not limited in description, it is necessary to determine its technical scope according to right.
Claims (4)
1. simplify a glow discharge nitriding technique for hydraulic plunger production procedure, it is characterized in that: comprise the following steps:
(1) original state steel is carried out modifier treatment；
(2) quenched and tempered state steel is cut into hydraulic plunger sample；
(3) sample is carried out grinding process, dehydrated alcohol carries out ultrasonic cleaning, drying；
(4) sample being put into ion nitriding furnace, be evacuated to below 18Pa, be passed through hydrogen sputtering 30min, furnace pressure keeps 400Pa；Furnace temperature being increased to 400～490 DEG C, is passed through nitrogen, carry out the process of glow discharge nitriding surface, temperature retention time is 4～8h；
(5), after nitriding terminates, sample cools to room temperature with the furnace.
A kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure the most according to claim 1, it is characterized in that: described step (1) Central Plains primary state steel matter is 38CrMoAl, modifier treatment is for being first warming up to 850 DEG C of insulation 8min water-cooleds to room temperature, then is warming up to 560 DEG C of insulation 30min water-cooleds to room temperature.
A kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure the most according to claim 1, is characterized in that: in described step (3), grinding process is to be polished by the SiC sand paper of sample 240#～2000#, then uses Cr2O polishing powder is polished to minute surface.
A kind of glow discharge nitriding technique simplifying hydraulic plunger production procedure the most according to claim 1, it is characterized in that: described step (4) intermediate ion nitrided surface processes and uses hydrogen and nitrogen mixed gas, nitrogen is 1:3 with the flow-rate ratio of hydrogen, furnace pressure 400Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610188185.2A CN105821370A (en) | 2016-03-29 | 2016-03-29 | Ion nitriding process for simplifying production process of hydraulic plunger |
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| CN201610188185.2A CN105821370A (en) | 2016-03-29 | 2016-03-29 | Ion nitriding process for simplifying production process of hydraulic plunger |
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| CN105821370A true CN105821370A (en) | 2016-08-03 |
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| CN201610188185.2A Pending CN105821370A (en) | 2016-03-29 | 2016-03-29 | Ion nitriding process for simplifying production process of hydraulic plunger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591771A (en) * | 2016-12-28 | 2017-04-26 | 常州大学 | Ion nitriding method for efficiently controlling formation of vein-like nitride on surface layer of 38CrMoAl mold |
| CN106637063A (en) * | 2016-12-28 | 2017-05-10 | 常州大学 | Ion nitriding surface modification method for improving heat fatigue of H13 hot-working die |
| CN113999953A (en) * | 2021-10-08 | 2022-02-01 | 清华大学 | Chemical heat treatment method of high-hardness 38CrMoAl nitrided steel |
Citations (4)
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| CN102560506A (en) * | 2012-01-09 | 2012-07-11 | 中国石油大学(华东) | Ion pulse quick nitriding strengthening and toughening process for oil pipe |
| CN103014599A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Treatment process of composite surface of austenitic stainless steel |
| CN103014601A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Austenitic stainless steel ion nitriding permeation catalyzing process |
| CN103233197A (en) * | 2013-05-13 | 2013-08-07 | 常州大学 | Low-temperature rapid ion nitriding method of austenitic stainless steel |
-
2016
- 2016-03-29 CN CN201610188185.2A patent/CN105821370A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560506A (en) * | 2012-01-09 | 2012-07-11 | 中国石油大学(华东) | Ion pulse quick nitriding strengthening and toughening process for oil pipe |
| CN103014599A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Treatment process of composite surface of austenitic stainless steel |
| CN103014601A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Austenitic stainless steel ion nitriding permeation catalyzing process |
| CN103233197A (en) * | 2013-05-13 | 2013-08-07 | 常州大学 | Low-temperature rapid ion nitriding method of austenitic stainless steel |
Non-Patent Citations (2)
| Title |
|---|
| RU-JUAN ZHAN ET AL.: "Plasma nitriding in low pressure in an ECR microwave plasma", 《SURFACE AND COATINGS TECHNOLOGY》 * |
| 左时燕等: "模具氮化及软氮化白亮层的控制", 《模具制造》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591771A (en) * | 2016-12-28 | 2017-04-26 | 常州大学 | Ion nitriding method for efficiently controlling formation of vein-like nitride on surface layer of 38CrMoAl mold |
| CN106637063A (en) * | 2016-12-28 | 2017-05-10 | 常州大学 | Ion nitriding surface modification method for improving heat fatigue of H13 hot-working die |
| CN106637063B (en) * | 2016-12-28 | 2019-03-22 | 常州大学 | A kind of raising H13 hot-work die thermal fatigue glow discharge nitriding surface modifying method |
| CN113999953A (en) * | 2021-10-08 | 2022-02-01 | 清华大学 | Chemical heat treatment method of high-hardness 38CrMoAl nitrided steel |
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Application publication date: 20160803 |