CN113881854A - Method for eliminating low-density inclusion defect source of titanium alloy ingot - Google Patents
Method for eliminating low-density inclusion defect source of titanium alloy ingot Download PDFInfo
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- CN113881854A CN113881854A CN202111260173.3A CN202111260173A CN113881854A CN 113881854 A CN113881854 A CN 113881854A CN 202111260173 A CN202111260173 A CN 202111260173A CN 113881854 A CN113881854 A CN 113881854A
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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
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a method for eliminating a low-density inclusion defect source of a titanium alloy ingot, which comprises the following steps: firstly, in the later stage of smelting by a VAR smelting method, a titanium alloy semi-finished product ingot with a flat riser end face and no gap is obtained by controlling the quality of a reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of an arc-closing process; turning flat heads to enable the end faces of the casting heads of the titanium alloy semi-finished products to be flat, seamless, free of flash, free of volatile matters, oxides, impurities and foreign matter residues; and thirdly, checking and removing residues, and then carrying out subsequent smelting to obtain the titanium alloy ingot. According to the invention, by controlling the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc-closing process at the later stage of smelting of the semi-finished product ingot and combining turning flat head treatment, the phenomena that volatile substances are infiltrated into the end face of the riser of the titanium alloy semi-finished product ingot in a gap, and impurities are locally enriched and cannot be found and removed are avoided, and the source of low-density inclusion defects 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 a low-density inclusion defect source of a titanium alloy ingot.
Background
Low-density inclusions (LDI) are bright bands and areas, and are areas enriched with alpha stabilizers (oxygen, nitrogen, carbon), which are characterized by being very hard, and are defects that occur in the defect sites during deformation, are loose, cavitated, and cracked, seriously impair the fatigue strength and plasticity of the material, and are fatal to materials used in aircraft engines and the like. Nitrides, oxides and carbides of titanium are the main cause of such defects. Because titanium nitride, titanium oxide and titanium carbide have relatively high melting points, it is difficult to completely dissolve and sufficiently diffuse these substances in a titanium melt during VAR (vacuum consumable arc furnace melting). Such defects are mainly caused by the alpha stabilizing element O, N, C, also called soft alpha defects, interstitial element segregation.
In the processing process of titanium and titanium alloy, the sources of low-density impurities include defect materials such as oxygen enrichment and nitrogen enrichment in raw materials, O, N pollution in electrode welding and the like, but the risk industry that metallurgical defects are caused by volatile matters and inclusions introduced by the fact that a gap exists at the head of a semi-finished cast ingot is not fully known. The titanium alloy ingot produced by the VAR (vacuum consumable electrode arc furnace) method is generally smelted twice or three times, and in the process of removing volatile matters and impurities at the riser end of the semi-finished product ingot after the primary or secondary smelting by using a lathe or cleaning the volatile matters and impurities on the surface of the semi-finished product ingot by using an ingot washer, part of the volatile matters and impurities are agglomerated into blocks and enter a gap at the riser end face of the semi-finished product ingot, so that the volatile matters and the impurities cannot be thoroughly removed. Once volatile matters, impurities and the like are condensed into blocks and enter gaps at the riser end of the semi-finished ingot, the blocks are difficult to find, and the flashes of the riser end cannot be removed by a conventional method of mechanically turning the riser end by a lathe and leveling the riser. Because volatile matters and impurities are enriched with O, C and other impurity elements, in the subsequent smelting process, the elements react with titanium to locally generate compounds with higher melting point and higher density relative to the matrix titanium, and the compounds cannot be completely eliminated in the subsequent smelting process, so that metallurgical defects such as low-density impurities recognized in the literature are formed, and serious quality risks are caused to a processed product.
At present, the arc-closing mode at the final stage of smelting the semi-finished product ingot in the domestic titanium and titanium alloy ingot processing process is not specified clearly, when the semi-finished product ingot is processed by flat head, the flash is generally required to be not more than 5mm after flat head, but the processing method and the standard after flat head for the situations that the end face of the riser of the semi-finished product ingot has a gap and the like are not specified clearly. Here, if the control is not good, it becomes a risk source of metallurgical defects.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for eliminating the defect source of low-density inclusion of a titanium alloy ingot aiming at the defects of the prior art. According to the method, the quality of a reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the post arc-closing process of the semi-finished product ingot casting are controlled, the turning flat head treatment is combined, so that the end face of the riser of the semi-finished product ingot casting is smooth and seamless, the phenomena that volatile substances are permeated into the end face of the riser of the titanium alloy semi-finished product ingot casting through gaps, impurities are locally enriched and cannot be found and removed are avoided, the metallurgical defects such as low-density impurities are generated in the subsequent smelting, and the source of the low-density impurities of the titanium alloy ingot casting is eliminated from the source.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for eliminating a low-density inclusion defect source of a titanium alloy ingot is characterized by comprising the following steps:
step one, in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later stage of smelting for preparing a titanium alloy semi-finished product ingot, the quality of a reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of an arc-closing process are controlled to obtain a titanium alloy semi-finished product ingot with a flat riser end face and no gap;
turning and flat-headed the end face of the riser of the titanium alloy semi-finished product ingot obtained in the step one by using a lathe, so that the end face of the riser of the titanium alloy semi-finished product ingot is flat, seamless, free of flash, free of volatile matters, oxides, impurities and foreign matter residues;
and step three, checking the titanium alloy semi-finished product ingot subjected to the turning flat head treatment in the step two, removing residues, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
Aiming at the hidden trouble that the riser end face of the semi-finished product ingot produces a gap to generate a low-density inclusion defect, the invention obtains the semi-finished product ingot with flat and seamless riser end face and thin and low flash by controlling the reserved consumable electrode quality, smelting current, voltage and arc stabilizing parameters of the arc closing process at the later stage of smelting the semi-finished product ingot, and then effectively removes the flash by adopting a turning flat head treatment process, so that the riser end face of the semi-finished product ingot is flat, seamless, free of flash, volatile, oxide, inclusion and foreign matter residue, thereby avoiding the occurrence of metallurgical defects such as gap infiltration of the volatile matter, partial enrichment of the inclusion and incapability of finding and removing the volatile matter residue, and the occurrence of low-density inclusion and the like on the riser end face of the titanium alloy semi-finished product ingot in the subsequent smelting, and eliminating the source of the low-density inclusion defect of the titanium alloy ingot from the source.
At present, no effective means is available for finding low-density inclusions through inspection of finished titanium alloy ingots, and only preventive measures can be taken to greatly reduce the risk of such defects. The low-density impurities in the titanium alloy are from various sources, for example, oxygen-rich and nitrogen-rich particles exist in the titanium sponge, and when the titanium dioxide is manually added, the mixture is not uniform, so that the local oxygen element is enriched, and the like. At present, various documents, smelting process rules, operation rules and the like in the industry do not put forward definite requirements on the arc-closing method at the later smelting stage of the VAR method and the surface quality of the riser end face of the ingot, and arc-closing process parameters at the later smelting stage of the VAR method are not made clearly, so that the risk of low-density impurities on the riser end face of the semi-finished ingot is not fully known and taken into consideration in the industry, and the method is put forward for the first time. The invention firstly and definitely puts forward different arc-closing technological parameters aiming at titanium alloy semi-finished product ingots with different specifications, and prevents volatile matters and impurities on the end surface of a riser of the ingot from entering a gap on the end surface of the riser of the ingot to generate low-density impurities by controlling the arc-closing technological parameters.
The method for eliminating the low-density inclusion defect source of the titanium alloy ingot is characterized in that the specific process of controlling the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc-extinguishing process in the step one comprises the following steps:
step 101, when the mass of the consumable electrode in a crucible of the smelting equipment is 200 kg-300 kg, controlling the water outlet temperature of a crystallizer for smelting to be 40-41 ℃; the diameter of the crucible is 500 mm-640 mm;
step 102, increasing the arc voltage by 0.5V-1V to promote the full contact between a liquid molten pool formed by consumable electrodes in the crystallizer and the inner wall of the crystallizer;
103, continuing smelting, and when the mass of the consumable electrode in the crucible of the smelting equipment is remained between 40kg and 60kg, starting arc-closing operation: gradually reducing the smelting current, keeping for 1min at 13 kA-18 kA, keeping for 1min at 12 kA-16 kA, keeping for 1min at 11 kA-13 kA, keeping for 1min at 10A-20A, keeping for 1min at 6A-10A, keeping for 4A-6A until the melting is finished, gradually reducing the arc voltage, keeping for 1min at 32V-34V, keeping for 1min at 30V-32V, and keeping for 27V-28V until the melting is finished, thus obtaining the titanium alloy semi-finished ingot.
The method selects different consumable electrode qualities, smelting current, arc stabilizing current and arc voltage aiming at crucibles with different diameters, namely in the later stage of VAR smelting, the smelting current is slowly reduced to enable a molten pool to become shallow, so that impurities such as volatile matters are promoted to be smoothly discharged, the arc voltage is reduced to reduce the arc distance, the radial temperature gradient of the molten pool is improved, the too fast solidification shrinkage of the edge of the molten pool is prevented, the arc stabilizing current is reduced to weaken the stirring strength, so that the height of a skull is reduced, the radial expansion of the arc is promoted, the radial temperature gradient of the molten pool is improved, the too fast solidification shrinkage of the edge of the molten pool is prevented, low-density impurities generated by the volatile matters and the oxides at the head of a semi-finished titanium alloy ingot are further prevented and eliminated, and the quality of the titanium alloy ingot is improved.
The method for eliminating the low-density inclusion defect source of the titanium alloy ingot is characterized in that the turning flat head treatment in the step two specifically comprises the following steps: and (3) adopting a lathe to perform turning machine flattening flash treatment on the end surface of the semi-finished product ingot casting riser, simultaneously avoiding using cooling liquid or performing fire cutting treatment on the flash, and when oxide exists at the corner part of the semi-finished product ingot casting after the flat head is turned, performing chamfering treatment on the corner part of the end surface, wherein the chamfer is not more than 20mm multiplied by 45 degrees. Because the end face of the riser of the semi-finished cast ingot is flat and seamless, the invention can remove the flash by directly turning the flat head by a lathe, avoids using cooling liquid to introduce pollution in the turning process, and simultaneously prohibits the flash from being subjected to fire cutting treatment to introduce oxides, thereby further improving the quality of the titanium alloy cast ingot.
The method for eliminating the source of the low-density inclusion defect of the titanium alloy ingot is characterized in that the process of inspecting and removing the residues in the step three is as follows: the end face and the corner part of the titanium alloy semi-finished product cast ingot are visually inspected, and attached and adhered scrap-shaped, granular and blocky residues are removed by a manual method. 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, the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the post arc-closing process of the titanium alloy semi-finished product ingot casting are controlled, and the turning flat head treatment is combined, so that the end surface of the riser of the semi-finished product ingot casting is smooth and seamless, the metallurgical defects that volatile matters are permeated into the end surface of the riser of the titanium alloy semi-finished product ingot casting, impurities are locally enriched and cannot be found and removed, and low-density impurities are generated in the subsequent smelting are avoided, and the source of the low-density impurity defect of the titanium alloy ingot casting is eliminated from the source.
2. According to the invention, clear requirements are provided for the surface condition of the riser of the titanium alloy semi-finished product ingot and the standard after turning flat head treatment, the source risk of low-density inclusion defects of the titanium alloy ingot is eliminated from the source, the establishment of the quality standard of the titanium alloy semi-finished product ingot is facilitated, and the effective control of the quality of the titanium alloy semi-finished product ingot is further realized.
3. The method firstly puts forward the risk of low-density impurities on the riser end face of the titanium alloy semi-finished product ingot, firstly and definitely puts forward different arc-closing technological parameters aiming at the titanium alloy semi-finished product ingot with different specifications, and prevents volatile matters and impurities on the riser end face of the ingot from entering a gap of the riser end face of the ingot to generate the risk of low-density impurities by controlling the arc-closing technological parameters, so that the low-density impurities generated by volatile matters and oxides on the head of the titanium alloy semi-finished product ingot are effectively prevented and eliminated.
4. The invention promotes the smooth discharge of the volatile matters and other impurities by controlling the process parameters of the pre-reserved consumable electrode quality, the smelting current, the arc stabilizing current, the arc voltage, the effluent temperature and the like of the arc-closing process, avoids the shrinkage effect of the over-fast solidification, further eliminates the low-density impurities generated by the volatile matters and the oxides at the head of the titanium alloy semi-finished ingot, improves the quality of the titanium alloy ingot, and is suitable for smelting different grades of titanium alloys in the vacuum consumable arc furnace with the same tonnage.
5. The control process of the invention is simple, easy to realize and suitable for batch industrial production.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a physical diagram of a riser end face of a titanium alloy semi-finished ingot casting in the prior art.
FIG. 2 is a real object diagram of a titanium alloy semi-finished product ingot casting riser end face after turning and flat-headed processing in the prior art.
FIG. 3 is a diagram showing the inclusion infiltration in the gap of the riser end face of the titanium alloy semi-finished product ingot in the prior art.
FIG. 4 is a drawing of a titanium alloy semi-finished ingot after turning and facing in example 1 of the present invention.
Detailed Description
As shown in fig. 1 to 3, in the prior art, there are residues of volatile matter, oxide and the like on the flash of the riser end surface of the titanium alloy semi-finished ingot, and after turning treatment, there still exists a gap in the riser end surface of the titanium alloy semi-finished ingot, and at the same time, because the arc-closing method in the melting process is not controlled, inclusions such as oxide and the like are infiltrated into the gap in the riser end surface of the titanium alloy semi-finished ingot.
Example 1
The embodiment comprises the following steps:
step one, in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later stage of smelting for preparing a titanium alloy semi-finished product ingot, the quality of a reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of an arc-closing process are controlled to obtain a titanium alloy semi-finished product ingot with a flat riser end face and no gap;
the specific process for controlling the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc extinguishing process comprises the following steps:
step 101, when the mass of a consumable electrode in a crucible of smelting equipment is 200kg, controlling the water outlet temperature of a crystallizer for smelting to be 40 ℃; the diameter of the crucible is 500 mm;
step 102, increasing the arc voltage by 0.5V to promote the full contact between a liquid molten pool formed by consumable electrodes in the crystallizer and the inner wall of the crystallizer;
103, continuing smelting, and when the mass of the consumable electrode in the crucible of the smelting equipment is remained 40kg, starting arc-closing operation: gradually reducing the smelting current, keeping for 1min at 13kA, keeping for 1min at 12kA, keeping for 11kA until the melting is finished, simultaneously gradually reducing the arc stabilizing current, keeping for 1min at 10A, keeping for 1min at 6A, keeping for 4A until the melting is finished, simultaneously gradually reducing the arc voltage, keeping for 1min at 32V, keeping for 1min at 30V, and keeping for 27V until the melting is finished, thus obtaining a titanium alloy semi-finished product ingot;
turning and flatting the end face of the riser of the titanium alloy semi-finished product ingot casting obtained in the step one by using a lathe, and controlling the rotating speed to be 8r/min, so that the end face of the riser of the titanium alloy semi-finished product ingot casting is flat, seamless, free of flash, free of volatile matters, oxides, inclusions and foreign matter residues, as shown in fig. 4;
the turning and flat head treatment process comprises the following specific steps: performing turning machine flattening flash processing on the end face of the semi-finished product ingot casting riser by using a lathe, simultaneously avoiding using cooling liquid or performing fire cutting processing on the flash, and performing chamfering processing on the edge angle of the end face when oxide exists at the edge angle part of the semi-finished product ingot casting after turning the flat head, wherein the chamfer angle is not more than 20mm multiplied by 45 degrees;
and step three, visually inspecting the end face and corner parts of the semi-finished product ingot after the turning and flat-head treatment in the step two, manually removing attached and adhered scrap-shaped, granular and blocky residues, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
Comparing fig. 1-3 with fig. 4, the invention can obtain the semi-finished product ingot with smooth riser end surface, no gap, no flash, no volatile matter, oxide, inclusion and foreign matter residue by controlling the reserved consumable electrode quality, the smelting current, the voltage and the arc stabilizing parameter of the arc-closing process in the later stage of smelting the semi-finished product ingot and combining the turning flat head treatment, thereby eliminating the low-density inclusion defect source of the titanium alloy ingot from the source.
Example 2
The embodiment comprises the following steps:
step one, in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later stage of smelting for preparing a titanium alloy semi-finished product ingot, the quality of a reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of an arc-closing process are controlled to obtain a titanium alloy semi-finished product ingot with a flat riser end face and no gap;
the specific process for controlling the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc extinguishing process comprises the following steps:
step 101, when the mass of a consumable electrode in a crucible of smelting equipment is 300kg, controlling the water outlet temperature of a crystallizer for smelting to be 41 ℃; the diameter of the crucible is 640 mm;
step 102, increasing the arc voltage 1V to promote the full contact between a liquid molten pool formed by consumable electrodes in the crystallizer and the inner wall of the crystallizer;
103, continuing smelting, and when the mass of the consumable electrode in the crucible of the smelting equipment is remained 60kg, starting arc-closing operation: gradually reducing the smelting current, keeping for 1min at 18kA, keeping for 1min at 16kA, keeping for 13kA until the melting is finished, simultaneously gradually reducing the arc stabilizing current, keeping for 1min at 20A, keeping for 1min at 10A, keeping for 6A until the melting is finished, simultaneously gradually reducing the arc voltage, keeping for 1min at 34V, keeping for 1min at 32V, and keeping for 28V until the melting is finished, thus obtaining a titanium alloy semi-finished product ingot;
turning and flatting the end face of the riser of the titanium alloy semi-finished product ingot casting obtained in the step one by using a lathe, and controlling the rotating speed to be 8r/min so that the end face of the riser of the titanium alloy semi-finished product ingot casting is flat, seamless, free of flash, free of volatile matters, oxides, impurities and foreign matter residues;
the turning and flat head treatment process comprises the following specific steps: performing turning machine flattening flash processing on the end face of the semi-finished product ingot casting riser by using a lathe, simultaneously avoiding using cooling liquid or performing fire cutting processing on the flash, and performing chamfering processing on the edge angle of the end face when oxide exists at the edge angle part of the semi-finished product ingot casting after turning the flat head, wherein the chamfer angle is not more than 20mm multiplied by 45 degrees;
and step three, visually inspecting the end face and corner parts of the semi-finished product ingot after the turning and flat-head treatment in the step two, manually removing attached and adhered scrap-shaped, granular and blocky residues, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (4)
1. A method for eliminating a low-density inclusion defect source of a titanium alloy ingot is characterized by comprising the following steps:
step one, in the process of preparing a titanium alloy ingot by a VAR smelting method, in the later stage of smelting for preparing a titanium alloy semi-finished product ingot, the quality of a reserved consumable electrode, smelting current, voltage and arc stabilizing parameters of an arc-closing process are controlled to obtain a titanium alloy semi-finished product ingot with a flat riser end face and no gap;
turning and flat-headed the end face of the riser of the titanium alloy semi-finished product ingot obtained in the step one by using a lathe, so that the end face of the riser of the titanium alloy semi-finished product ingot is flat, seamless, free of flash, free of volatile matters, oxides, impurities and foreign matter residues;
and step three, checking the titanium alloy semi-finished product ingot subjected to the turning flat head treatment in the step two, removing residues, and then carrying out subsequent smelting to obtain the titanium alloy ingot.
2. The method for eliminating the source of the low-density inclusion defects of the titanium alloy ingots according to claim 1, wherein the specific process of controlling the quality of the reserved consumable electrode, the smelting current, the voltage and the arc stabilizing parameters of the arc extinguishing process in the first step comprises the following steps:
step 101, when the mass of the consumable electrode in a crucible of the smelting equipment is 200 kg-300 kg, controlling the water outlet temperature of a crystallizer for smelting to be 40-41 ℃; the diameter of the crucible is 500 mm-640 mm;
step 102, increasing the arc voltage by 0.5V-1V to promote the full contact between a liquid molten pool formed by consumable electrodes in the crystallizer and the inner wall of the crystallizer;
103, continuing smelting, and when the mass of the consumable electrode in the crucible of the smelting equipment is remained between 40kg and 60kg, starting arc-closing operation: gradually reducing the smelting current, keeping for 1min at 13 kA-18 kA, keeping for 1min at 12 kA-16 kA, keeping for 1min at 11 kA-13 kA, keeping for 1min at 10A-20A, keeping for 1min at 6A-10A, keeping for 4A-6A until the melting is finished, gradually reducing the arc voltage, keeping for 1min at 32V-34V, keeping for 1min at 30V-32V, and keeping for 27V-28V until the melting is finished, thus obtaining the titanium alloy semi-finished ingot.
3. The method for eliminating the source of the low-density inclusion defects of the titanium alloy ingot according to claim 1, wherein the turning and flat-heading treatment in the second step is carried out by the following specific processes: and (3) adopting a lathe to perform turning machine flattening flash treatment on the end surface of the semi-finished product ingot casting riser, simultaneously avoiding using cooling liquid or performing fire cutting treatment on the flash, and when oxide exists at the corner part of the semi-finished product ingot casting after the flat head is turned, performing chamfering treatment on the corner part of the end surface, wherein the chamfer is not more than 20mm multiplied by 45 degrees.
4. The method of claim 1, wherein the step three comprises inspecting and removing the residue by: the end face and the corner part of the titanium alloy semi-finished product cast ingot are visually inspected, and attached and adhered scrap-shaped, granular and blocky residues are removed by a manual method.
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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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