CN113174501A - Method for improving visibility and stability of titanium alloy in argon-filling smelting process - Google Patents
Method for improving visibility and stability of titanium alloy in argon-filling smelting process Download PDFInfo
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- CN113174501A CN113174501A CN202010701304.6A CN202010701304A CN113174501A CN 113174501 A CN113174501 A CN 113174501A CN 202010701304 A CN202010701304 A CN 202010701304A CN 113174501 A CN113174501 A CN 113174501A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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Abstract
The invention discloses a control method for improving visibility and stability of a titanium alloy in an argon-filled smelting process, which comprises the following steps: turning an ingot crown of an electrode to be melted, and putting the ingot crown and an auxiliary electrode with a proper diameter into an electric arc furnace in an assembling way; evacuating, welding, removing surface floating ash, charging again and evacuating; the method comprises the steps of preparing argon with higher purity, connecting the argon in parallel with an argon filling valve, opening the argon filling valve to flush a pipeline after the vacuum degree reaches a certain requirement, setting reasonable argon filling parameters and voltage control parameters, starting arc and smelting, improving voltage stability and achieving the effect that a molten pool is visible in the whole smelting process.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing, and particularly relates to a method for improving visibility and stability of a titanium alloy in an argon-filled smelting process.
Background
The titanium alloy has excellent specific strength, specific stiffness, corrosion resistance and other properties, and is widely applied to the field of aerospace, wherein part of titanium alloys such as TA21, TC1, TC2 and the like need to be filled with argon gas during smelting to improve the pressure in a furnace to inhibit the volatilization of Mn elements due to the addition of the alloy element Mn with extremely high volatility. Meanwhile, in order to avoid glow discharge during smelting, the argon filling pressure is generally greater than 10000Pa, so that the voltage fluctuation is inevitably large, and meanwhile, the darkening visibility of a molten pool is reduced until the darkening visibility is invisible.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for improving the visibility and stability of a titanium alloy argon-filling smelting process.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for improving visibility and stability of a titanium alloy in an argon-filling smelting process comprises the following steps:
1): removing the ingot crown from the consumable electrode;
2): selecting a titanium alloy auxiliary electrode and the consumable electrode processed in the step 1) to assemble into a furnace chamber, vacuumizing the furnace chamber, welding, and recovering the furnace chamber to an atmospheric state after welding is finished;
3): vacuumizing the furnace chamber again, and flushing the pipeline through argon;
4): setting argon filling parameters: the argon filling pressure is 8000Pa to 50000Pa, the opening degree of the evacuation valve is 5 percent to 20 percent, the integration time is 5s to 30s, the argon filling proportional coefficient is 0.05 to 0.30(l/min)/Pa, and the argon filling basic flow is 10 to 100 (l/min)/Pa; setting voltage parameters: the voltage calculation integral time is 50-600 s, and the voltage control proportional coefficient is 100-300%;
5): and turning on a power supply to start arc starting smelting.
Further, the diameter ratio of the auxiliary electrode to the consumable electrode in the step 2) is 0.5-0.7.
Further, the furnace chambers in the step 2) and the step 3) are crucibles, and the diameter of each crucible is 400-750 mm.
Further, the parameters of welding in step 2) are as follows: the welding current is 2 kA-10 kA, the welding voltage is 22V-31V, the welding arc is stabilized by 0A-20A, and the welding time is 3 min-15 min.
Further, the cooling time after welding in the step 2) is more than or equal to 20 min.
Further, in the step 3), the vacuum degree is pumped to be less than or equal to 2.0Pa, and the leakage rate is less than or equal to 0.8 Pa/min.
Further, the amount of argon supplied in step 3) was 2 bottles/h.
Further, the argon filling flow of the argon flushing pipeline in the step 3) is more than or equal to 10 (L/min)/Pa.
Further, the time for flushing the pipeline with argon in the step 3) is more than or equal to 1 min.
Further, the purity of argon is > 99.90%.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the titanium alloy smelting according to the invention obviously improves the voltage stability and simultaneously achieves the effect that the whole smelting process can see a molten pool.
Drawings
FIG. 1 is a voltage detection diagram for different argon filling modes of the present invention;
FIG. 2 is a diagram showing the condition of the molten pool during the arc striking period in the current argon filling mode;
FIG. 3 is a diagram showing the condition of a molten bath during the melting period in the current argon filling mode;
FIG. 4 is a diagram showing the molten bath during the feeding period in the current argon filling mode according to the present invention;
FIG. 5 is a diagram showing the state of the molten pool during the arc striking period in example 1 of the present invention;
FIG. 6 is a diagram showing the molten bath during the melting period in example 1 of the present invention;
FIG. 7 is a view showing the condition of a molten pool during feeding in example 1 of the present invention;
FIG. 8 is a diagram showing the state of the molten pool during the arc striking period in example 2 of the present invention;
FIG. 9 is a diagram showing the molten bath during the melting period in example 2 of the present invention;
FIG. 10 is a view showing the condition of a molten pool during feeding in example 2 of the present invention;
FIG. 11 is a diagram showing the state of the molten pool during the arc striking period in example 3 of the present invention;
FIG. 12 is a diagram showing the molten bath during the melting period in example 3 of the present invention;
FIG. 13 is a view showing the condition of a molten pool during feeding in example 3 of the present invention;
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1
turning a consumable electrode cast ingot with the diameter of phi 360mm to remove an ingot crown;
step 2, electrode welding:
selecting a titanium alloy auxiliary electrode with the diameter of phi 240mm, assembling the titanium alloy auxiliary electrode and the cast ingot with the diameter of phi 360mm in the step 1 in a crucible with the diameter of phi 440mm, opening a vacuum pump set until the vacuum reaches 4.5Pa, and starting an arc to weld the auxiliary electrode and the consumable electrode. The welding current is 4kA, the welding voltage is 26V, the welding arc is stabilized at 6A, and the welding time is 8 min. Cooling for 30min after welding, closing the vacuum pump set until the vacuum state reaches the atmospheric state, opening the furnace chamber for welding inspection, and closing the furnace chamber again after welding beading and floating ash are cleaned;
and step 3: connecting 8 bottles of argon with the purity of 99.99 percent in parallel and connecting the argon with an argon filling valve; opening a vacuum pump set until the vacuum degree is 1.8Pa and the leakage rate is 0.7Pa/min, setting the argon filling flow rate to be 10(l/min)/Pa, opening an argon filling valve, and flushing a pipeline for 1 min;
and 4, step 4: setting argon filling parameters, setting the argon filling pressure to be 10000Pa, setting the opening degree of a vacuum-pumping valve to be 7%, setting the integration time to be 10s, setting the argon filling proportional coefficient to be 0.08(l/min)/Pa, and setting the argon filling basic flow to be 10 (l/min)/Pa; setting voltage control parameters: the voltage calculation integral time is 200s, and the voltage control proportional coefficient is 100 percent;
and 5: and (5) turning on a power supply to start arc melting. As shown in fig. 5, 6 and 7, the smelting is performed in different periods of visibility.
Example 2
turning a consumable electrode cast ingot with the diameter of phi 460mm to remove an ingot crown;
step 2, electrode welding:
selecting a titanium alloy auxiliary electrode with the diameter of phi 280mm, assembling the titanium alloy auxiliary electrode and the cast ingot with the diameter of phi 460mm in the step 1 in a crucible with the diameter of phi 560mm, opening a vacuum pump set until the vacuum reaches 4.0Pa, and starting an arc to weld the auxiliary electrode and the consumable electrode. The welding current is 6kA, the welding voltage is 28V, the welding arc is stabilized by 10A, and the welding time is 10 min. Cooling for 40min after welding, closing the vacuum pump set until the vacuum state reaches the atmospheric state, opening the furnace chamber for welding inspection, and closing the furnace chamber again after welding beading and floating ash are cleaned;
and step 3: connecting 10 bottles of argon with the purity of 99.97 percent in parallel and connecting the argon with an argon filling valve; opening a vacuum pump set until the vacuum degree is 1.6Pa and the leakage rate is 0.6Pa/min, setting the argon filling flow to be 15(l/min)/Pa, opening an argon filling valve, and flushing a pipeline for 3 min;
and 4, step 4: setting argon filling parameters, setting the argon filling pressure to be 15000Pa, setting the opening degree of a vacuumizing valve to be 10 percent, setting the integration time to be 20s, setting the argon filling proportional coefficient to be 0.20(l/min)/Pa and setting the argon filling basic flow to be 30 (l/min)/Pa; setting a voltage control PI parameter: the voltage calculation integral time is 300s, and the voltage control proportional coefficient is 200%;
and 5: and (5) turning on a power supply to start arc melting. As shown in fig. 8, 9 and 10, the situation of visibility in different periods is smelted.
Example 3
turning a consumable electrode cast ingot with the diameter of phi 560mm to remove an ingot crown;
step 2, electrode welding:
selecting a titanium alloy auxiliary electrode with the diameter of phi 320mm, assembling the titanium alloy auxiliary electrode and the cast ingot with the diameter of phi 560mm in the step 1 in a crucible with the diameter of phi 640mm, opening a vacuum pump set until the vacuum reaches 5Pa, and starting an arc to weld the auxiliary electrode and the consumable electrode. The welding current is 8kA, the welding voltage is 29V, the welding arc is stabilized by 15A, and the welding time is 12 min. Cooling for 60min after welding, closing the vacuum pump set until the vacuum state reaches the atmospheric state, opening the furnace chamber for welding inspection, and closing the furnace chamber again after welding beading and floating ash are cleaned;
and step 3: connecting 12 bottles of argon with the purity of 99.98 percent in parallel and connecting the argon with an argon filling valve; opening a vacuum pump set until the vacuum degree is 1.3Pa and the leakage rate is 0.5Pa/min, setting the argon filling flow rate to be 40(l/min)/Pa, opening an argon filling valve, and flushing the pipeline for 2 min;
and 4, step 4: setting argon filling parameters, setting the argon filling pressure to be 30000Pa, setting the opening degree of a vacuumizing valve to be 15%, setting the integration time to be 15s, setting the argon filling proportional coefficient to be 0.25(l/min)/Pa, and setting the argon filling basic flow to be 80 (l/min)/Pa; setting a voltage control PI parameter: the voltage calculation integral time is 600s, and the voltage control proportional coefficient is 150%;
and 5: and (5) turning on a power supply to start arc melting. As shown in fig. 11, 12 and 13, the melting is performed in different periods of visibility.
As shown in table 1, the voltage values measured in different argon filling modes at different time periods are plotted according to the data in the following table to obtain the voltage detection graph shown in fig. 1.
TABLE 1 actual measurement of voltage values at different time periods for different argon filling modes
The standard deviation of the voltage of each embodiment can be calculated by the following formula, and the lower the standard deviation of the voltage, the better the stability is represented:
wherein n: the number of samples; x: a sample mean value; x is the number ofi: random samples.
The calculation of the above formula shows that the standard deviation of the voltage of the current argon filling mode is 1.126, and the improvement of the present invention shows that the smaller the standard deviation of the voltage of example 1 is 0.401, the standard deviation of the voltage of example 2 is 0.451, and the standard deviation of the voltage of example 3 is 0.305, the more stable the voltage is, and it can be seen from fig. 1 that the fluctuation of the voltage value of the current argon filling mode is larger, while the fluctuation of the voltage value of examples 1, 2 and 3 is more stable.
While FIGS. 2-13 are graphs of the bath during different periods of time for the prior art argon charging mode and examples 1, 2 and 3 utilizing the process of the present invention, it can also be seen that the visibility in the bath is significantly higher for the examples utilizing the process of the present invention than for the prior art argon charging mode.
Claims (10)
1. A method for improving visibility and stability of a titanium alloy in an argon-filling smelting process is characterized by comprising the following steps:
1): removing the ingot crown from the consumable electrode;
2): selecting a titanium alloy auxiliary electrode and the consumable electrode processed in the step 1) to assemble into a furnace chamber, vacuumizing the furnace chamber, welding, and recovering the furnace chamber to an atmospheric state after welding is finished;
3): vacuumizing the furnace chamber again, and flushing the pipeline through argon;
4): setting argon filling parameters: the argon filling pressure is 8000Pa to 50000Pa, the opening degree of the evacuation valve is 5 percent to 20 percent, the integration time is 5s to 30s, the argon filling proportional coefficient is 0.05 to 0.30(l/min)/Pa, and the argon filling basic flow is 10 to 100 (l/min)/Pa; setting voltage parameters: the voltage calculation integral time is 50-600 s, and the voltage control proportional coefficient is 100-300%;
5): and turning on a power supply to start arc starting smelting.
2. The method for improving visibility and stability of the titanium alloy during argon-filled smelting process of claim 1, wherein the diameter ratio of the auxiliary electrode to the consumable electrode in the step 2) is 0.5-0.7.
3. The method for improving the visibility and the stability of the titanium alloy argon-filled smelting process according to claim 1, wherein the furnace chamber in the step 2) and the step 3) is a crucible, and the diameter of the crucible is 400-750 mm.
4. The method for improving visibility and stability of the titanium alloy argon-filled smelting process according to claim 1, wherein the welding parameters in the step 2) are as follows: the welding current is 2 kA-10 kA, the welding voltage is 22V-31V, the welding arc is stabilized by 0A-20A, and the welding time is 3 min-15 min.
5. The method for improving the visibility and the stability of the titanium alloy in the argon-filled smelting process according to claim 4, wherein the cooling time after welding in the step 2) is more than or equal to 20 min.
6. The method for improving the visibility and the stability of the titanium alloy in the argon-filling smelting process according to claim 1, wherein the step 3) is carried out in a vacuum mode until the vacuum degree is less than or equal to 2.0Pa and the leakage rate is less than or equal to 0.8 Pa/min.
7. The method for improving the visibility and the stability of the titanium alloy argon-filled smelting process according to claim 1, wherein the supply amount of argon in the step 3) is 2 bottles/h.
8. The method for improving the visibility and the stability of the titanium alloy in the argon-filled smelting process according to claim 7, wherein the argon-filling flow rate of the argon flushing pipeline in the step 3) is more than or equal to 10 (L/min)/Pa.
9. The method for improving visibility and stability of the titanium alloy argon-filled smelting process according to claim 8, wherein the time for flushing the pipeline with argon in the step 3) is more than or equal to 1 min.
10. The method for improving the visibility and stability of a titanium alloy during argon-filled smelting as recited in any one of claims 7-9 wherein said argon gas is greater than 99.90% pure.
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| CN202010701304.6A CN113174501B (en) | 2020-07-20 | 2020-07-20 | Method for improving visibility and stability of titanium alloy in argon-filling smelting process |
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| CN202010701304.6A CN113174501B (en) | 2020-07-20 | 2020-07-20 | Method for improving visibility and stability of titanium alloy in argon-filling smelting process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214458A (en) * | 1992-01-31 | 1993-08-24 | Nkk Corp | Method for melting titanium alloy ingot by var process |
| CN108359808A (en) * | 2018-04-30 | 2018-08-03 | 西部钛业有限责任公司 | The method that big specification TC4 titan alloy casting ingots are prepared using high proportion titanium defective material |
| CN110964932A (en) * | 2019-11-18 | 2020-04-07 | 西部超导材料科技股份有限公司 | Arc-extinguishing process of VAR titanium alloy primary ingot |
-
2020
- 2020-07-20 CN CN202010701304.6A patent/CN113174501B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214458A (en) * | 1992-01-31 | 1993-08-24 | Nkk Corp | Method for melting titanium alloy ingot by var process |
| CN108359808A (en) * | 2018-04-30 | 2018-08-03 | 西部钛业有限责任公司 | The method that big specification TC4 titan alloy casting ingots are prepared using high proportion titanium defective material |
| CN110964932A (en) * | 2019-11-18 | 2020-04-07 | 西部超导材料科技股份有限公司 | Arc-extinguishing process of VAR titanium alloy primary ingot |
Non-Patent Citations (1)
| Title |
|---|
| 《稀有金属材料加工手册》编写组编: "《稀有金属材料加工手册》", 31 March 1984, 冶金工业出版社 * |
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