CN109518121A - A method of regulating and controlling thin-wall titanium alloy part deformation using hollow cathode effect - Google Patents
A method of regulating and controlling thin-wall titanium alloy part deformation using hollow cathode effect Download PDFInfo
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- CN109518121A CN109518121A CN201811392551.1A CN201811392551A CN109518121A CN 109518121 A CN109518121 A CN 109518121A CN 201811392551 A CN201811392551 A CN 201811392551A CN 109518121 A CN109518121 A CN 109518121A
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- titanium alloy
- hollow cathode
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- wall
- cathode effect
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The invention belongs to technical field of metal heat treatment, it is related to a kind of method using hollow cathode effect regulation thin-wall titanium alloy part deformation, using conventional ion nitriding furnace, make less than 2 times aura thickness degree of distance between tooling and part outer wall, improves nitriding process temperature using hollow cathode effect.The present invention is overlapped by tubular tooling, part with the effective workspace of ion nitriding furnace " three-core ", tooling and part same material, it is ensured that part is heated evenly.Cathode pan bottom temperature-control heat couple prevents technique overtemperature by leading near titanium alloy component in tubular tooling base apertures.Part nitrogenizes preceding 850~950 DEG C of the high temperature anneals, and with 0.5~2 DEG C/min heating and 300~450 DEG C of rate of temperature fall progress, 500~650 DEG C of steps heatings, heat preservation and cooling, arriving warm soaking time need to be in 2~4h.Class thin-wall titanium alloy part is turned round after 750~880 DEG C of 4~15h of nitridation, surface hardness is not less than HV800, effective case depth 0.05mm or more, and deflection is no more than 0.020mm after nitridation.
Description
Technical field
The invention belongs to technical field of metal heat treatment, are related to a kind of utilization hollow cathode effect regulation thin-wall titanium alloy zero
The method of part deformation.
Background technique
Traditional conventional ion nitriding furnace maximum operation (service) temperature is only 650 DEG C, and titanium alloy component nitrogenizes rear surface microhardness
When such as reaching HV800, nitriding process temperature is usually at 750 DEG C or more.
The part of existing titanium alloy ionic nitriding, usual surface hardness require in HV800 hereinafter, Deformation control amplitude almost
It does not require.To realize that this function mostly uses Active Screen technology, that is, make the titanium that a porous dress shape is connect with cathode high voltage
Alloy cylinder, although deformation extent can be reduced to a certain extent using this method, for answering for some superfinishing Deformation controls
Miscellaneous structural aerospace thin-wall titanium alloy part cannot achieve process distortions requirement by this Active Screen technology merely.
Summary of the invention
The purpose of the present invention is: it is assisted using traditional conventional ion nitriding furnace using hollow cathode effect with special tool
Dress makes titanium alloy thin wall rotary part ionic nitriding rear surface hardness not less than HV800, effective case depth 0.05mm or more
Except, deflection is no more than 0.020mm after nitridation.
A kind of technical solution of the invention are as follows: side using hollow cathode effect regulation thin-wall titanium alloy part deformation
Method, by special tooling, is formed between tooling and part outer wall using conventional ion nitriding furnace and is less than 2 times of degree of aura thickness
Small space be superimposed with part outer wall aura by tooling using hollow cathode effect to realize and improve piece surface temperature
To technological temperature and uniformly heated function.
The titanium alloy ionic nitriding special tooling is tubular construction, is supported by stainless steel pipe, is connected with cathode disc,
And it is in the geometric center of the effective workspace of titanium alloy ionic nitriding special equipment.Tubular tooling, part and ion nitriding furnace have
The schematic diagram of workspace " three-core " coincidence is imitated as shown in attached drawing 1.
The titanium alloy thin-wall part is put into titanium alloy ionic nitriding special tooling, the outer wall of tooling and titanium alloy component
Distance is between 5~20mm, tooling and the same trade mark of part.
The titanium alloy component uses the Auxiliary support column made with trade mark material, keeps part axle center and tooling axle center same
Axis.
The Auxiliary support column, to improve current density of part during ionic nitriding, column diameter cannot be big
In φ 5mm, column needs to be distributed in tubular tooling bottom and in sustained height level.
The ion nitriding furnace be commonly without auxiliary thermal source, without using the conventional ion nitriding furnace of Active Screen technology, need by
Cathode pan bottom temperature-control heat couple in tubular tooling base apertures by leading near titanium alloy component.
Revolving body of the titanium alloy component having a size of 50~100mm, 3~7mm of effective thickness exists in titanium alloy component
Hole, slot part need to be shielded using the mode of mechanical masking, do not allow hole, slot occur hollow cathode effect.
The titanium alloy component deformation superfinishing control needs to carry out 800~950 DEG C of high temperature to part before ionic nitriding to move back
Fire processing.
The titanium alloy component deformation superfinishing control, ion nitriding technology temperature is 750~900 DEG C, temperature retention time of nitrogenization
For 4~15h.
The titanium alloy component deformation superfinishing control, needs to carry out ladder-elevating temperature, heat preservation and cooling in ionic nitriding, rise
Temperature is 0.5~2 DEG C/min with rate of temperature fall.
The titanium alloy component deformation superfinishing control, ladder-elevating temperature and cooling temperature range are respectively 300~450 DEG C, 500
~650 DEG C.
The solution have the advantages that: the present invention regulates and controls the side of thin-wall titanium alloy part deformation using hollow cathode effect
Method forms the small space less than 2 times of degree of aura thickness, by work using hollow cathode effect between tooling and part outer wall
Dress, part are overlapped with the effective workspace of ion nitriding furnace " three-core ", are realized and are evenly heated to part, titanium alloy ionic nitriding
Rear surface hardness is not less than except HV800, effective case depth 0.05mm or more, and deflection is no more than 0.020mm after nitridation.
Detailed description of the invention
Fig. 1 is that part, tubular tooling with the effective workspace of ion nitriding furnace " three-core " are overlapped schematic diagram；
Fig. 2 is Figure 1A-A cross-sectional view；
Fig. 3 is asymmetric rotary thin-wall titanium alloy component structural schematic diagram；
Fig. 4 is asymmetric rotary thin-wall titanium alloy component top view；
Wherein, 1- tubular tooling lower plate, 2- tubular tooling shield, 3- Auxiliary support pin column, 4- ion nitriding furnace
Middle part temperature-control heat couple, the effective workspace of 5- ion nitriding furnace.
Specific embodiment
Below with reference to embodiment, the present invention will be further described:
The present invention is chosen without auxiliary thermal source, no using the method for hollow cathode effect regulation thin-wall titanium alloy part deformation
Using the conventional ion nitriding furnace of Active Screen, by special tooling, is formed between tooling and part outer wall and be less than aura thickness
The small space of 2 times of degree is superimposed using hollow cathode effect by tooling with part outer wall aura to realize raising piece surface
Temperature is to technological temperature and uniformly heated function.
The titanium alloy ionic nitriding special tooling is tubular construction, is supported by using 1Cr18Ni stainless steel pipe, with
Cathode disc is connected, using TA7 material tubular tooling lower plate and TA7 material Auxiliary support column, the structure in ion nitriding furnace
Build up equipotential negative glow geometric space, ion nitriding technology stage, tooling and part same material, it is ensured that tooling and part
Linear expansion coefficient is identical at high temperature, and is in the geometric center of the effective workspace of titanium alloy ionic nitriding special equipment, so that
Tubular tooling, part are overlapped with the effective workspace of ion nitriding furnace " three-core ", as depicted in figs. 1 and 2.
By taking certain specification TA7 trade mark titanium alloy thin-wall part parts with complex structures as an example, as shown in Figure 3, Figure 4, effective wall
Thickness is only 3mm.Part ionic nitriding rear surface hardness is not less than except HV800, effective case depth 0.05mm or more, nitridation
Deflection is no more than 0.020mm afterwards.The distance between tooling and part are 15mm, it is ensured that are formed between tooling and part empty
Heart cathode zone makes part heating effect Chong Die with the aura layer of tooling using the narrow regions, aura overlay region is substantially improved
The temperature of interior part realizes the ionic nitriding of titanium alloy component.
In the geometric space of tubular tooling, electrification cation is influenced by equipotential, to the part in tubular tooling
Bombardment uniformity is substantially improved, and macro manifestations are that the being heated evenly property of part is improved.
The use of Auxiliary support column diameter is φ 5mm, is used to support part, can effectively improve ion nitriding furnace inner cathode
Disk reduces aura thickness degree by current strength of the auxiliary strut to parts transport.
Cathode pan bottom temperature-control heat couple is inserted near titanium alloy component by tubular tooling bottom, improves part
Technological temperature monitoring capacity in nitridation process.The equal hole of bottom surface in tubular tooling, convenient for charged particle from tooling
Part is bombarded in lower two sides simultaneously, and both direction is heated evenly part up and down.
By making part, tubular tooling and the effective workspace three geometric center overlapping of ion nitriding furnace, greatly improve
The part consistency that all directions are bombarded by charged particle heat in ionic nitriding, that is, being heated evenly property are effectively ensured.
After carrying out 900 DEG C of high annealing 6h before part nitridation, then High temperature ion nitridation is carried out, improves part at high temperature
Thermal structure stability, reduce because organize it is unstable caused by part size deform.
Part takes step-wise manner heating and cooling, and being raised to 400 DEG C of heating rates from room temperature is 2 DEG C/min, and 400 DEG C are arrived Wen Houbao
Then warm 4h is warming up to 550 DEG C with 1 DEG C/min, to temperature after keep the temperature 2h, continue to be warming up to 880 DEG C with 1 DEG C/min, keep the temperature 6h.So
Be cooled to 550 DEG C afterwards with 1 DEG C/min, to temperature after keep the temperature 2h, then be cooled to 400 DEG C with 1 DEG C/min, to temperature after keep the temperature 2h, stop
Heated by Glow Discharge system, after furnace cooling is down to 200 DEG C, blow-on simultaneously takes out titanium alloy component.Titanium alloy is thermally conductive poor, and part is taken
Ladder-elevating temperature, heat preservation and cooling can effectively reduce large-scale titanium alloy part because the thermal stress generation caused by internal-external temperature difference is macro
See deformation.By the use of the above method, after the part ionic nitriding, surface hardness HV1207, case depth 0.09mm, most
Oval and taper while meeting metallurgical quality requirement, realizes the asymmetric revolution class of large scale in 0.017mm or so eventually
The superfinishing control of titanium alloy component High temperature ion nitridation deformation.
Claims (8)
1. a kind of method using hollow cathode effect regulation thin-wall titanium alloy part deformation, which is characterized in that by tubular work
Dress, is overlapped tubular tooling, titanium alloy component with the effective workspace of ion nitriding furnace " three-core ", in tubular tooling and titanium alloy zero
The small space for being less than 2 times of aura thickness degree is formed between part outer wall, using hollow cathode effect, is closed by tubular tooling and titanium
The superposition of metal parts outer wall aura is heat-treated piece surface.
2. the method according to claim 1 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, the tubular tooling is supported by stainless steel pipe, it is connected with cathode disc, and in the effective workspace of ion nitriding furnace
Geometric center.
3. the method according to claim 1 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, cathode pan bottom temperature-control heat couple in tubular tooling base apertures by leading near titanium alloy component.
4. the method according to claim 1 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, the Auxiliary support column diameter cannot be greater than φ 5mm, and column needs to be distributed in tubular tooling bottom and in same height
Degree is horizontal.
5. the method according to claim 1 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, there are the parts of hole, slot to be shielded using the mode of mechanical masking in the titanium alloy component, avoids the occurrence of hole, slot
Hollow cathode effect occurs.
6. the method according to claim 1 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, the titanium alloy component carries out 800~950 DEG C of the high temperature anneals to part before ionic nitriding.
7. the method according to claim 6 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, is 750~880 DEG C by the ion nitriding technology temperature that hollow cathode effect reaches, temperature retention time of nitrogenization is 4~15h.
8. the method according to claim 7 using hollow cathode effect regulation thin-wall titanium alloy part deformation, feature
It is, ladder-elevating temperature, heat preservation and cooling are carried out when ionic nitriding, and heating is 0.5~2 DEG C/min, ladder-elevating temperature with rate of temperature fall
It is respectively 300~450 DEG C, 500~650 DEG C with cooling temperature range, to 2~4h of temperature heat preservation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811392551.1A CN109518121B (en) | 2018-11-21 | 2018-11-21 | Method for regulating and controlling deformation of thin-wall titanium alloy part by using hollow cathode effect |
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| CN201811392551.1A CN109518121B (en) | 2018-11-21 | 2018-11-21 | Method for regulating and controlling deformation of thin-wall titanium alloy part by using hollow cathode effect |
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| CN109518121A true CN109518121A (en) | 2019-03-26 |
| CN109518121B CN109518121B (en) | 2021-09-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518122A (en) * | 2018-12-05 | 2019-03-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component ionic nitriding control method of thin-walled large scale |
| CN109680243A (en) * | 2018-12-05 | 2019-04-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component of thin-walled small-medium size nitrogenizes deformation control method |
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| CN1263953A (en) * | 1999-12-29 | 2000-08-23 | 西安交通大学 | Industrial pulse or DC plasma and chemical gas-phase deposition equipment for strenthening surface of tool or mould |
| FR2911347A1 (en) * | 2007-01-17 | 2008-07-18 | Jatco Ltd | METHOD FOR TREATING ALUMINUM SURFACE AND ALUMINUM COMPOSITE MATERIAL |
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| CN1263953A (en) * | 1999-12-29 | 2000-08-23 | 西安交通大学 | Industrial pulse or DC plasma and chemical gas-phase deposition equipment for strenthening surface of tool or mould |
| FR2911347A1 (en) * | 2007-01-17 | 2008-07-18 | Jatco Ltd | METHOD FOR TREATING ALUMINUM SURFACE AND ALUMINUM COMPOSITE MATERIAL |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518122A (en) * | 2018-12-05 | 2019-03-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component ionic nitriding control method of thin-walled large scale |
| CN109680243A (en) * | 2018-12-05 | 2019-04-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component of thin-walled small-medium size nitrogenizes deformation control method |
| CN109680243B (en) * | 2018-12-05 | 2021-11-09 | 中国航发哈尔滨东安发动机有限公司 | Thin-wall medium-small-size asymmetric rotation type titanium alloy part nitriding deformation control method |
| CN109518122B (en) * | 2018-12-05 | 2022-01-14 | 中国航发哈尔滨东安发动机有限公司 | Ion nitriding control method for thin-wall large-size asymmetric rotary titanium alloy part |
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| CN109518121B (en) | 2021-09-10 |
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