CN113881854B - Method for eliminating sources of low-density inclusion defects of titanium alloy cast ingot - Google Patents
Method for eliminating sources of low-density inclusion defects of titanium alloy cast ingot Download PDFInfo
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- CN113881854B CN113881854B CN202111260173.3A CN202111260173A CN113881854B CN 113881854 B CN113881854 B CN 113881854B CN 202111260173 A CN202111260173 A CN 202111260173A CN 113881854 B CN113881854 B CN 113881854B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/20—Arc remelting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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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
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- 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
Abstract
The invention discloses a method for eliminating sources of low-density inclusion defects of a titanium alloy cast ingot, which comprises the following steps: 1. in the later smelting stage of the VAR smelting method, the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of an arc receiving process are controlled to obtain a titanium alloy semi-finished product ingot with a flat riser end face and no gap; 2. the turning flat head treatment ensures that the end face of the riser of the titanium alloy semi-finished ingot casting is flat, seamless, free of flash, free of volatile matters, oxide, inclusion and foreign matter residue; 3. and (5) checking and removing residues, and then carrying out subsequent smelting to obtain the titanium alloy cast ingot. According to the invention, by controlling the mass of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc receiving process in the later smelting stage of the semi-finished ingot, and combining the turning flat head treatment, the phenomenon that the gap on the end face of the riser of the titanium alloy semi-finished ingot permeates volatile matters and inclusions are locally enriched and cannot be found and removed is avoided, and the defect source of the low-density inclusions of the titanium alloy ingot is eliminated from the source.
Description
Technical Field
The invention belongs to the technical field of titanium alloy preparation, and particularly relates to a method for eliminating sources of low-density inclusion defects of titanium alloy cast ingots.
Background
The Low Density Inclusion (LDI) is a bright strip and area, and is an area enriched with alpha stabilizer (oxygen, nitrogen and carbon), and is characterized in that the low density inclusion is very hard, loose, holes and cracks appear at defect positions in the deformation process, the fatigue strength and plasticity of materials are seriously damaged, and the LDI is a fatal defect of materials for aircraft engines and the like. Titanium nitrides, oxides and carbides are the main cause of such defects. Since titanium nitride, titanium oxide and titanium carbide have relatively high melting points, it is difficult for these substances to be completely dissolved and sufficiently diffused in the titanium melt during VAR (vacuum consumable arc furnace) process. Such defects are mainly caused by alpha stabilizing elements O, N, C, also known as soft alpha defects, interstitial element segregation.
Sources of low-density impurities in the titanium and titanium alloy processing process are brought in by oxygen-enriched and nitrogen-enriched defect materials in raw materials, O, N pollution during electrode welding and the like, but the risk industry of introducing volatiles and impurities to cause metallurgical defects due to gaps in the head of a semi-finished ingot is not fully known. The production of titanium alloy cast ingot by VAR (vacuum consumable arc furnace) method is generally carried out twice or three times of smelting, and in the process of removing volatiles and inclusions at the riser end of the semi-finished cast ingot after the primary or secondary smelting by turning with a lathe or cleaning volatiles and inclusions on the surface of the semi-finished cast ingot by using an ingot cleaning machine, partial volatiles and inclusions are aggregated into blocks and enter into gaps at the riser end face of the semi-finished cast ingot, so that the volatiles and inclusions cannot be thoroughly removed. Once the aggregated blocks of volatile matters, inclusions and the like enter gaps of the riser ends of the semi-finished ingot, the aggregated blocks are difficult to find, and the conventional method for machining the riser ends to form flat riser burrs by using a lathe cannot be removed. Because the volatile matters and the impurities are enriched with O, C and other impurity elements, the elements react with titanium locally to generate compounds with higher melting point and higher density relative to the titanium matrix in the subsequent smelting process, and the compounds cannot be thoroughly eliminated in the subsequent smelting process, so that metallurgical defects of low-density impurities and the like recognized in the literature are formed, and serious quality risks are caused to processed products.
At present, the arc-collecting mode at the end of smelting a semi-finished ingot in the process of processing the titanium and titanium alloy ingot in China is not clearly defined, and when the semi-finished ingot is subjected to flat head treatment, the flash after flat head is generally only not more than 5mm, but the treatment method for the condition that gaps and the like appear on the dead head end surface of the semi-finished ingot and the standard after flat head are not clearly defined. If not well controlled, this becomes a risk source for metallurgical defects.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for eliminating sources of low-density inclusion defects of titanium alloy ingots aiming at the defects in the prior art. According to the method, the reserved consumable electrode quality, smelting current, voltage and arc stabilizing parameters of an arc collecting process in the later smelting stage of the semi-finished ingot are controlled, and the end face of the riser of the semi-finished ingot is smooth and seamless by combining turning flat head treatment, so that the defects that the end face of the riser of the semi-finished ingot of the titanium alloy is prevented from being infiltrated with volatile matters, impurities are prevented from being locally enriched and cannot be found and removed, metallurgical defects such as low-density impurities are generated in the subsequent smelting, and the sources of the defects of the low-density impurities of the ingot of the titanium alloy are eliminated from the source.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for eliminating sources of low-density inclusion defects in a titanium alloy ingot, the method comprising the steps of:
in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later smelting period of preparing a titanium alloy semi-finished ingot, the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of an arc receiving process are controlled to obtain the titanium alloy semi-finished ingot with a flat riser end face and no gap;
turning the end face of the titanium alloy semi-finished ingot casting riser obtained in the step one by adopting a lathe to carry out flat head turning treatment, so that the end face of the titanium alloy semi-finished ingot casting riser is flat, seamless, free of flash, free of volatile matters, oxides, inclusions and residues of foreign matters;
and thirdly, checking the titanium alloy semi-finished product cast ingot subjected to the turning flat head treatment in the second step, removing residues, and then carrying out subsequent smelting to obtain the titanium alloy cast ingot.
Aiming at the hidden trouble that gaps are generated on the dead head end surface of a semi-finished ingot to generate low-density inclusion defects, the invention obtains the semi-finished ingot with flat dead head end surface, no gaps and thin and low flash through controlling the reserved consumable electrode quality, smelting current, voltage and arc stabilizing parameters of the arc collecting process in the later smelting stage of the semi-finished ingot, and then adopts a turning flat head treatment process to effectively remove the flash, so that the dead head end surface of the semi-finished ingot is flat, seamless, free of flash, free of volatile, oxide, inclusion and foreign object residues, thereby avoiding the occurrence of the gap infiltration volatile, the local enrichment, the incapability of finding and removing the inclusion on the dead head end surface of the semi-finished ingot of the titanium alloy, and the metallurgical defects such as low-density inclusion and the like in the subsequent smelting, and eliminating the sources of the low-density inclusion defects of the titanium alloy ingot from the source.
At present, no effective means is available for detecting low-density impurities through the inspection of titanium alloy cast ingot finished products, and only preventive measures can be taken to greatly reduce the risk of generating the defects. Sources of low-density inclusions in titanium alloy are various, such as oxygen-enriched and nitrogen-enriched particles in titanium sponge, local oxygen enrichment caused by uneven mixing when titanium dioxide is manually added. At present, various documents, smelting technological regulations, operation regulations and the like in the industry do not provide clear requirements for an arc-collecting method in the later stage of the VAR method smelting and the surface quality of the end face of an ingot riser, and do not clearly set arc-collecting technological parameters in the later stage of the VAR method smelting, so that the risk of low-density inclusion of the end face of the semi-finished ingot riser is not fully known and considered in the industry, and the invention is provided for the first time. According to the method, different arc-collecting technological parameters are formulated for the titanium alloy semi-finished product cast ingots with different specifications for the first time, the arc-collecting technological parameters are controlled to prevent volatile matters and impurities on the end face of the cast ingot riser from entering gaps on the end face of the cast ingot riser to generate risks of low-density impurities, and the low-density impurities generated by the volatile matters and the oxides on the head of the titanium alloy semi-finished product cast ingot are effectively prevented and eliminated in the process, so that the method is suitable for smelting titanium alloys with different brands in vacuum consumable arc furnaces with different tonnages.
The method for eliminating the sources of the low-density inclusion defects of the titanium alloy cast ingot is characterized in that the specific process for controlling the reserved consumable electrode quality, smelting current, voltage and arc stabilizing parameters of the arc receiving process in the first step comprises the following steps:
101, controlling the water outlet temperature of a crystallizer for smelting to be 40-41 ℃ when 200-300 kg of consumable electrode mass remains in a crucible of smelting equipment; the diameter of the crucible is 500-640 mm;
102, increasing arc voltage by 0.5V-1V to promote the full contact between a liquid molten pool formed by a consumable electrode in the crystallizer and the inner wall of the crystallizer;
step 103, continuing smelting, and starting arc-collecting operation when the mass of the consumable electrode in the crucible of the smelting equipment is 40 kg-60 kg: gradually reducing smelting current, sequentially maintaining for 1min at 13 kA-18 kA, maintaining for 1min at 12 kA-16 kA, maintaining for 11 kA-13 kA until smelting is completed, simultaneously gradually reducing arc stabilizing current, sequentially maintaining for 1min at 10A-20A, maintaining for 1min at 6A-10A, maintaining for 4A-6A until smelting is completed, simultaneously gradually reducing arc voltage, sequentially maintaining for 1min at 32V-34V, maintaining for 1min at 30V-32V, and maintaining for 27V-28V until smelting is completed, thus obtaining a titanium alloy semi-finished ingot.
According to the invention, different consumable electrode masses, smelting currents, arc stabilizing currents and arc voltages are selected for crucibles with different diameters, namely, in the later stage of smelting by a VAR method, a smelting current is slowly reduced to enable a molten pool to be gradually shallower, so that smooth discharge of impurities such as volatile matters and the like is promoted, meanwhile, the arc voltage is reduced to reduce arc distance, the radial temperature gradient of the molten pool is improved, the excessive rapid solidification shrinkage of the edge part of the molten pool is prevented, meanwhile, the arc stabilizing currents are reduced to weaken stirring intensity, so that the height of a solidified shell is reduced, the radial expansion of an arc is promoted, the radial temperature gradient of the molten pool is also improved, the effect of preventing the excessive rapid solidification shrinkage of the edge part of the molten pool is further prevented, and the quality of a titanium alloy ingot is improved.
The method for eliminating the sources of the low-density inclusion defects of the titanium alloy cast ingot is characterized in that the concrete process of the turning flat head treatment in the second step is as follows: and (3) performing turning machine trimming flash treatment on the end face of the semi-finished ingot riser by adopting a lathe, avoiding using cooling liquid or performing flame cutting treatment on the flash, and chamfering the end face edges when oxides exist at the edges of the turned flat-headed semi-finished ingot, wherein the chamfer is not more than 20mm multiplied by 45 degrees. The riser end face of the semi-finished product ingot is flat and seamless, the invention can directly adopt the lathe to carry out turning flat head to remove flash, and the cooling liquid is prevented from being used for introducing pollution in the turning process, and simultaneously, the flash is strictly forbidden to be subjected to fire cutting treatment for introducing oxide, so that the quality of the titanium alloy ingot is further improved.
The method for eliminating the sources of the low-density inclusion defects of the titanium alloy cast ingot is characterized in that the process of checking and removing residues in the third step is as follows: visual inspection is adopted to inspect the end face and the edge angle part of the titanium alloy semi-finished product ingot, and a manual method is adopted to remove the attached and adhered chip-shaped, granular and block residues. The residues can be found and removed in time through visual inspection, and the method is simple and easy to implement.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, by controlling the mass of the reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of the arc collecting process in the later smelting stage of the titanium alloy semi-finished product ingot, and combining the turning flat head treatment, the end face of the semi-finished product ingot riser is smooth and seamless, so that the defects that the end face of the titanium alloy semi-finished product ingot riser is subjected to gap infiltration volatile matter, the inclusions are locally enriched and cannot be found and removed, and the metallurgical defects such as low-density inclusions are generated in the subsequent smelting stage, and the sources of the defects of the low-density inclusions of the titanium alloy ingot are eliminated from the source.
2. The method has the advantages that the method has clear requirements on the surface condition of the riser of the titanium alloy semi-finished product ingot and the standard after the turning flat head treatment, eliminates the source risk of the low-density inclusion defects of the titanium alloy ingot from the source, is beneficial to the establishment of the quality standard of the titanium alloy semi-finished product ingot, and further realizes the effective control of the quality of the titanium alloy semi-finished product ingot.
3. According to the invention, the risk of low-density inclusion of the riser end face of the titanium alloy semi-finished product ingot is firstly provided, different arc-striking process parameters are formulated for titanium alloy semi-finished products of different specifications, and the risk of low-density inclusion caused by the fact that volatiles and inclusions on the riser end face of the ingot enter gaps on the riser end face of the ingot is prevented by controlling the arc-striking process parameters, so that the low-density inclusion caused by the volatiles and oxides on the head of the titanium alloy semi-finished product ingot is effectively prevented and eliminated.
4. The invention promotes the smooth discharge of impurities such as volatile matters and the like, avoids the shrinkage effect of excessively fast solidification, further eliminates low-density impurities generated by the volatile matters and oxides at the head of the semi-finished titanium alloy ingot, improves the quality of the titanium alloy ingot, and is suitable for smelting titanium alloys of different brands in a vacuum consumable arc furnace with the same tonnage by controlling the technological parameters such as the reserved consumable electrode quality, smelting current, arc stabilizing current, arc voltage, water outlet temperature and the like of the arc receiving technology.
5. The invention has simple control process and easy realization, and is suitable for batch industrial production.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a physical diagram of a riser end face of a semi-finished titanium alloy ingot in the prior art.
Fig. 2 is a physical diagram of a riser end face of a semi-finished titanium alloy ingot casting after the facing treatment in the prior art.
FIG. 3 is a diagram showing the prior art of infiltration of inclusions into a gap in the riser end face of a semi-finished titanium alloy ingot.
Fig. 4 is a diagram showing a semi-finished titanium alloy ingot according to example 1 of the present invention after the turning and flattening process.
Detailed Description
As shown in fig. 1 to 3, in the prior art, residues such as volatile matters, oxides and the like exist on the flash of the riser end face of the semi-finished titanium alloy ingot, and after turning treatment, gaps still exist in the riser end face of the semi-finished titanium alloy ingot, and meanwhile, as the arc-striking method in the smelting process is not controlled, impurities such as oxides and the like permeate into the gaps of the riser end face of the semi-finished titanium alloy ingot.
Example 1
The embodiment comprises the following steps:
in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later smelting period of preparing a titanium alloy semi-finished ingot, the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of an arc receiving process are controlled to obtain the titanium alloy semi-finished ingot with a flat riser end face and no gap;
the specific process for controlling the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of the arc receiving process comprises the following steps:
step 101, controlling the water outlet temperature of a crystallizer for smelting to be 40 ℃ when 200kg of consumable electrode mass remains in a crucible of smelting equipment; the diameter of the crucible is 500mm;
102, increasing arc voltage by 0.5V to promote a liquid molten pool formed by a consumable electrode in the crystallizer to be fully contacted with the inner wall of the crystallizer;
step 103, continuing smelting, and starting arc-receiving operation when 40kg of consumable electrode mass remains in a crucible of smelting equipment: gradually reducing smelting current, sequentially maintaining for 1min at 13kA, maintaining for 1min at 12kA, maintaining for 11kA until the smelting is completed, gradually reducing arc stabilizing current, sequentially maintaining for 1min at 10A, maintaining for 1min at 6A, maintaining for 4A until the smelting is completed, gradually reducing arc voltage, and sequentially maintaining for 1min at 32V, maintaining for 1min at 30V, and maintaining for 27V until the smelting is completed to obtain a titanium alloy semi-finished product cast ingot;
turning the end face of the riser of the semi-finished titanium alloy ingot casting obtained in the step one by adopting a lathe, and controlling the rotating speed to be 8r/min, so that the end face of the riser of the semi-finished titanium alloy ingot casting is flat, seamless, free of flash, free of volatile matters, oxides, inclusions and residues of foreign matters, as shown in fig. 4;
the concrete process of turning the flat head is as follows: adopting a lathe to carry out turning machine leveling flash treatment on the end face of a semi-finished ingot riser, simultaneously avoiding using cooling liquid or carrying out fire cutting treatment on the flash, and carrying out chamfering treatment on the edge angle of the end face when oxides exist at the edge angle part of the semi-finished ingot after the flat head is turned, wherein the chamfering is not more than 20mm multiplied by 45 degrees;
and thirdly, visually inspecting the end face and the edge angle of the semi-finished product ingot after the turning flat head treatment in the second step, removing attached and adhered chip-shaped, granular and block residues by adopting a manual method, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
Comparing fig. 1-3 with fig. 4, it can be known that the invention obtains the semi-finished product ingot with flat riser end surface, no gap, no flash, no volatile matter, oxide, inclusion and foreign matter residue by controlling the quality of the reserved consumable electrode in the later stage of smelting the semi-finished product ingot, the smelting current, voltage and arc stabilizing parameters of the arc receiving process and combining the turning flat head treatment, thereby eliminating the source of the low density inclusion defect of the titanium alloy ingot from the source.
Example 2
The embodiment comprises the following steps:
in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later smelting period of preparing a titanium alloy semi-finished ingot, the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of an arc receiving process are controlled to obtain the titanium alloy semi-finished ingot with a flat riser end face and no gap;
the specific process for controlling the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of the arc receiving process comprises the following steps:
step 101, controlling the water outlet temperature of a crystallizer for smelting to be 41 ℃ when 300kg of consumable electrode mass remains in a crucible of smelting equipment; the diameter of the crucible is 640mm;
step 102, increasing arc voltage by 1V to promote a liquid molten pool formed by a consumable electrode in the crystallizer to be fully contacted with the inner wall of the crystallizer;
step 103, continuing smelting, and starting arc-receiving operation when 60kg of consumable electrode mass remains in a crucible of smelting equipment: gradually reducing smelting current, sequentially maintaining for 1min at 18kA, maintaining for 1min at 16kA and maintaining for 13kA until the smelting is completed, gradually reducing arc stabilizing current, sequentially maintaining for 1min at 20A, maintaining for 1min at 10A, maintaining for 6A until the smelting is completed, gradually reducing arc voltage, and sequentially maintaining for 1min at 34V, maintaining for 1min at 32V and maintaining for 28V until the smelting is completed to obtain a titanium alloy semi-finished product cast ingot;
turning the end face of the riser of the semi-finished titanium alloy ingot casting obtained in the step one by adopting a lathe, and controlling the rotating speed to be 8r/min, so that the end face of the riser of the semi-finished titanium alloy ingot casting is flat, seamless, free of flash, free of volatile matters, oxides, inclusions and residues of foreign matters;
the concrete process of turning the flat head is as follows: adopting a lathe to carry out turning machine leveling flash treatment on the end face of a semi-finished ingot riser, simultaneously avoiding using cooling liquid or carrying out fire cutting treatment on the flash, and carrying out chamfering treatment on the edge angle of the end face when oxides exist at the edge angle part of the semi-finished ingot after the flat head is turned, wherein the chamfering is not more than 20mm multiplied by 45 degrees;
and thirdly, visually inspecting the end face and the edge angle of the semi-finished product ingot after the turning flat head treatment in the second step, removing attached and adhered chip-shaped, granular and block residues by adopting a manual method, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (3)
1. A method for eliminating sources of low-density inclusion defects in a titanium alloy ingot, the method comprising the steps of:
in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later smelting period of preparing a titanium alloy semi-finished ingot, the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of an arc receiving process are controlled to obtain the titanium alloy semi-finished ingot with a flat riser end face and no gap; the specific process for controlling the reserved consumable electrode mass, smelting current, voltage and arc stabilizing parameters of the arc receiving process comprises the following steps:
101, controlling the water outlet temperature of a crystallizer for smelting to be 40-41 ℃ when 200-300 kg of consumable electrode mass remains in a crucible of smelting equipment; the diameter of the crucible is 500-640 mm;
102, increasing arc voltage by 0.5V-1V to promote the full contact between a liquid molten pool formed by a consumable electrode in the crystallizer and the inner wall of the crystallizer;
step 103, continuing smelting, and starting arc-collecting operation when the mass of the consumable electrode in the crucible of the smelting equipment is 40 kg-60 kg: gradually reducing smelting current, sequentially maintaining for 1min at 13 kA-18 kA, maintaining for 1min at 12 kA-16 kA, maintaining for 11 kA-13 kA until smelting is completed, simultaneously gradually reducing arc stabilizing current, sequentially maintaining for 1min at 10A-20A, maintaining for 1min at 6A-10A, maintaining for 4A-6A until smelting is completed, simultaneously gradually reducing arc voltage, sequentially maintaining for 1min at 32V-34V, maintaining for 1min at 30V-32V, and maintaining for 27V-28V until smelting is completed, thus obtaining a titanium alloy semi-finished ingot;
turning the end face of the titanium alloy semi-finished ingot casting riser obtained in the step one by adopting a lathe to carry out flat head turning treatment, so that the end face of the titanium alloy semi-finished ingot casting riser is flat, seamless, free of flash, free of volatile matters, oxides, inclusions and residues of foreign matters;
and thirdly, checking the titanium alloy semi-finished product cast ingot subjected to the turning flat head treatment in the second step, removing residues, and then carrying out subsequent smelting to obtain the titanium alloy cast ingot.
2. The method for eliminating sources of low-density inclusion defects in a titanium alloy ingot according to claim 1, wherein the turning flat head treatment in the second step comprises the following specific steps: and (3) performing turning machine trimming flash treatment on the end face of the semi-finished ingot riser by adopting a lathe, avoiding using cooling liquid or performing flame cutting treatment on the flash, and chamfering the end face edges when oxides exist at the edges of the turned flat-headed semi-finished ingot, wherein the chamfer is not more than 20mm multiplied by 45 degrees.
3. The method for eliminating sources of low-density inclusion defects in a titanium alloy ingot according to claim 1, wherein the process of inspecting and removing residues in the third step is as follows: visual inspection is adopted to inspect the end face and the edge angle part of the titanium alloy semi-finished product ingot, and a manual method is adopted to remove the attached and adhered chip-shaped, granular and block residues.
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| CN113373317A (en) * | 2021-05-13 | 2021-09-10 | 湖南金天钛业科技有限公司 | Preparation method of zero shrinkage cavity titanium or titanium alloy ingot and ingot |
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