CN116732289A - Method for preventing oxidation during vacuum annealing aging heat treatment of parts - Google Patents
Method for preventing oxidation during vacuum annealing aging heat treatment of parts Download PDFInfo
- Publication number
- CN116732289A CN116732289A CN202310781745.5A CN202310781745A CN116732289A CN 116732289 A CN116732289 A CN 116732289A CN 202310781745 A CN202310781745 A CN 202310781745A CN 116732289 A CN116732289 A CN 116732289A
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- China
- Prior art keywords
- heat treatment
- parts
- preventing oxidation
- aging
- vacuum annealing
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- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000032683 aging Effects 0.000 title claims abstract description 33
- 238000000137 annealing Methods 0.000 title claims abstract description 31
- 230000003647 oxidation Effects 0.000 title claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 239000010936 titanium Substances 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000002845 discoloration Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 9
- 239000012535 impurity Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Classifications
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physical Vapour Deposition (AREA)
Abstract
The invention relates to a method for preventing oxidation during vacuum annealing aging heat treatment of a part, and belongs to the technical field of heat treatment of metal materials. A method for preventing oxidation during vacuum annealing aging heat treatment of parts comprises the following steps: step 1: cleaning parts, tools and metal scraps with acetone and airing; step 2: wrapping the parts with metal scraps and then putting the parts into a tool; step 3: and placing the part coated by the metal scraps in an effective working area of heating equipment, and carrying out annealing aging heat treatment according to the technological parameters of the material. The invention has the following advantages: 1. under the condition of reducing the heat treatment requirements of equipment, gas purity and the like, parts meeting the requirements can be produced; 2. solves the problem that the existing part is easy to generate oxidative discoloration in the vacuum annealing aging heat treatment process; 3. the method is simple and reliable to operate, has low requirements on operators, fully utilizes metal scraps generated in the machining process of the parts, and can effectively save cost.
Description
Technical Field
The invention relates to a method for preventing oxidation during vacuum annealing and ageing heat treatment of a part, which realizes that a titanium alloy part does not generate a surface pollution alpha layer during annealing and ageing under low vacuum (vacuum degree of 0.133Pa-13.3 Pa), and belongs to the technical field of heat treatment of metal materials.
Background
In the heat treatment process of the parts, when the parts are contacted with oxygen, the oxidation phenomenon occurs on the surfaces of the parts, the product quality is affected, and the parts cannot be normally delivered. At present, the method for preventing the oxidation of the parts in the heat treatment process comprises the steps of coating a layer of anti-oxidation protective coating on the parts before the heat treatment, and removing the protective coating of the parts by adopting a sand blowing or machining method after the heat treatment. Or the oxide layer is removed by turning or blowing sand after the thermal treatment and oxidation of the part, which leads to the increase of the production process of the part, and the turning and blowing sand process is complex, so that the delivery cycle of the part is increased. Vacuum heat treatment is an ideal oxidation-free, decarbonization-free heat treatment technique, which is widely used in industry. However, when the vacuum annealing aging heat treatment process is actually performed on the part, part of metals (such as titanium alloy) which are more sensitive to oxidation are subjected to heat treatment under the atmosphere of low vacuum, and as trace impurity gases still exist in the furnace and the cooling gas, certain alloy elements react with the impurity gases in the part heat treatment process, so that oxide layers with different degrees are formed on the surface of the part. This is the annealing ageing of titanium alloys generally requires high vacuum (vacuum. Ltoreq.6.7X10) -2 Pa, and the pressure rise rate should be small < 0.67 Pa/h), stringent requirements are imposed on the vacuum performance of the vacuum heat treatment apparatus.
Disclosure of Invention
The invention aims to provide a method for preventing oxidation during vacuum annealing and ageing heat treatment of a part, which can be used for realizing that a titanium alloy part does not generate a surface pollution alpha layer during annealing and ageing under low vacuum (vacuum degree of 0.133Pa-13.3 Pa), solving the problems that the conventional titanium alloy part is easy to generate oxidation and discoloration, the part delivery period is increased or cannot be delivered during the low vacuum annealing and ageing heat treatment process, and reducing the requirement on the vacuum performance of vacuum equipment.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for preventing oxidation during vacuum annealing aging heat treatment of parts comprises the following steps:
step 1: cleaning parts, tools and metal scraps with acetone and airing;
step 2: wrapping the parts with metal scraps and then putting the parts into a tool;
step 3: and placing the part coated by the metal scraps in an effective working area of heating equipment, and carrying out annealing aging heat treatment according to the technological parameters of the material.
Preferably, in step 1, the metal chip material is titanium chip or stainless steel chip.
Preferably, in the step 1, the smaller the metal chip particle size is less than 10mm, the better the smaller the metal chip particle size is.
Preferably, in the step 2, the unilateral thickness of the metal scraps coated outside the part is larger than 50mm so as to achieve a better protection effect.
Preferably, in step 1, the tooling is a titanium alloy tooling; the part is a TA15 titanium alloy part; the metal scraps are titanium scraps.
Further, in the step 3, the annealing aging heat treatment includes the following steps:
step one, pumping the pressure of a heating chamber of a vacuum furnace to 0.133Pa-13.3Pa, and then performing ageing heat treatment;
step two, heating to 500-700 ℃, and preserving heat for 200-500 min;
thirdly, after the heat preservation is finished, introducing argon gas for air cooling, and starting a circulating fan in the cooling process;
and step four, discharging the furnace for air cooling after the furnace temperature is cooled to be lower than 90 ℃, and taking out the parts.
Further, in the second step, the temperature is raised to 600 ℃, and the temperature is kept for 220 minutes.
In the third step, the purity of the argon is more than or equal to 99.999 percent, and the cooling pressure is 1Bar.
Furthermore, the method for coating the part by the metal scraps is not limited, so that the production is convenient, and the aim of preventing the part from being oxidized is achieved.
Working principle: in the heat treatment process, the metal scraps with high chemical activity are used for wrapping the parts, and the metal scraps react with impurity gas in the heat treatment process, so that the contact between the parts and the impurity gas can be reduced to a certain extent, and the surface quality of the parts after heat treatment is improved.
Compared with the prior art, the invention has the following advantages:
1. in the vacuum annealing aging process, under the condition of reducing the heat treatment requirements of equipment, gas purity and the like, parts meeting the requirements can be produced;
2. solves the problem that the existing part is easy to generate oxidative discoloration in the vacuum annealing aging heat treatment process, and the method is suitable for the heat treatment process of most metal materials;
3. the method is simple and reliable to operate, has low requirements on operators, fully utilizes metal scraps generated in the machining process of the parts, and can effectively save cost.
Drawings
FIG. 1 is a metallographic photograph of a TA15 titanium alloy part without an alpha layer after heat treatment in a low vacuum (vacuum level 0.133Pa-13.3 Pa) environment in an embodiment of the present invention.
Description of the embodiments
In this embodiment, the tool is a titanium alloy tool, the part is a TA15 titanium alloy part, the metal chip is a titanium chip, the invention is described by this, other materials can be selected according to the need, and the parameters of the annealing aging heat treatment process can be changed, so that the invention is not limited.
The invention is further described below with reference to fig. 1:
a method for preventing oxidation during vacuum annealing aging heat treatment of parts comprises the following steps:
(1) Taking a titanium alloy tool, a TA15 titanium alloy part and titanium scraps, cleaning with acetone, and airing;
(2) The part is wrapped by titanium scraps and then is put into a titanium alloy tool, and the unilateral thickness of the metal scraps wrapped outside the part is more than 50mm;
(3) Then put it in the vacuum annealing ageing furnace effectivelyIn the working area, the furnace door is closed, the pressure of the heating chamber of the vacuum furnace is pumped to 0.133Pa-13.3Pa (according to the heat treatment requirement of HB 7750 titanium alloy part vacuum heat treatment, the vacuum pressure in the vacuum furnace during the heat treatment of the titanium alloy part is less than or equal to 6.7X10) -2 Pa. ) Then carrying out aging heat treatment; heating to 600 ℃, and preserving heat for 220min; in the whole heating and heat preservation process, the pressure in the furnace is controlled to be 0.133-Pa-13.3 Pa, argon with the purity more than or equal to 99.999% is introduced for air cooling after heat preservation is finished, the cooling pressure is 1Bar, and a circulating fan is started in the cooling process; and (5) taking out the part from the furnace for air cooling after the furnace temperature is cooled to be lower than 90 ℃, and taking out the part by wearing clean white gloves when the part is taken out of the furnace.
The protection method is adopted to protect the TA15 titanium alloy part, even if the vacuum stress relief annealing heat treatment is carried out under the vacuum degree which does not reach the standard document requirement, the surface of the part is still bright and clean, no obvious oxidation color exists, the alpha layer detection is carried out on the TA15 titanium alloy part according to GB/T-23603 titanium and titanium alloy surface pollution layer detection method, the detection result is shown in figure 1, no obvious alpha layer exists on the surface layer of the part, the part meets the part acceptance requirement, and the subsequent oxide film removal process is not needed.
Claims (8)
1. A method for preventing oxidation during vacuum annealing aging heat treatment of a part, comprising the steps of:
step 1: cleaning parts, tools and metal scraps with acetone and airing;
step 2: wrapping the parts with metal scraps and then putting the parts into a tool;
step 3: and placing the part coated by the metal scraps in an effective working area of heating equipment, and carrying out annealing aging heat treatment according to the technological parameters of the material.
2. The method for preventing oxidation during vacuum annealing, aging and heat treatment of parts according to claim 1, wherein in step 1, the metal scraps are titanium scraps or stainless steel scraps.
3. The method for preventing oxidation at the time of vacuum annealing, aging and heat treatment of parts according to claim 1 or 2, wherein in step 1, the particle size of the metal filings is less than 10mm.
4. The method for preventing oxidation during vacuum annealing, aging and heat treatment of a part according to claim 1, wherein in step 2, the thickness of a single side of the metal scraps coated outside the part is larger than 50mm.
5. The method for preventing oxidation during vacuum annealing, aging and heat treatment of a part according to claim 1, wherein in step 1, the tooling is a titanium alloy tooling; the part is a TA15 titanium alloy part; the metal scraps are titanium scraps.
6. The method for preventing oxidation during vacuum annealing, aging and heat treating a part according to claim 5, wherein in step 3, the annealing, aging and heat treating comprises the steps of:
step one, pumping the pressure of a heating chamber of a vacuum furnace to 0.133Pa-13.3Pa, and then performing ageing heat treatment;
step two, heating to 500-700 ℃, and preserving heat for 200-500 min;
thirdly, after the heat preservation is finished, introducing argon gas for air cooling, and starting a circulating fan in the cooling process;
and step four, discharging the furnace for air cooling after the furnace temperature is cooled to be lower than 90 ℃, and taking out the parts.
7. The method for preventing oxidation according to claim 6, wherein in the second step, the temperature is raised to 600 ℃ and the temperature is kept for 220 min.
8. The method for preventing oxidation in vacuum annealing, aging and heat treatment of parts according to claim 6, wherein in step three, the purity of argon is not less than 99.999%, and the cooling pressure is 1Bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310781745.5A CN116732289A (en) | 2023-06-29 | 2023-06-29 | Method for preventing oxidation during vacuum annealing aging heat treatment of parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310781745.5A CN116732289A (en) | 2023-06-29 | 2023-06-29 | Method for preventing oxidation during vacuum annealing aging heat treatment of parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116732289A true CN116732289A (en) | 2023-09-12 |
Family
ID=87913230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310781745.5A Pending CN116732289A (en) | 2023-06-29 | 2023-06-29 | Method for preventing oxidation during vacuum annealing aging heat treatment of parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116732289A (en) |
-
2023
- 2023-06-29 CN CN202310781745.5A patent/CN116732289A/en active Pending
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