CN115584405B - Titanium alloy cast ingot, preparation method thereof and titanium alloy product - Google Patents
Titanium alloy cast ingot, preparation method thereof and titanium alloy product Download PDFInfo
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- CN115584405B CN115584405B CN202211318580.XA CN202211318580A CN115584405B CN 115584405 B CN115584405 B CN 115584405B CN 202211318580 A CN202211318580 A CN 202211318580A CN 115584405 B CN115584405 B CN 115584405B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 146
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 146
- 238000003756 stirring Methods 0.000 claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005204 segregation Methods 0.000 description 9
- 239000000155 melt Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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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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- 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
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a titanium alloy cast ingot, a preparation method thereof and a titanium alloy product, wherein the preparation method of the titanium alloy cast ingot comprises the following steps: sequentially carrying out first smelting, second smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy cast ingot; wherein, the first smelting adopts a direct current stirring magnetic field, and the magnetic field strength is 10 Gs-25 Gs; the second smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field strength is 12 Gs-30 Gs. The titanium alloy cast ingot prepared by the method can effectively improve the uniformity of the titanium alloy cast ingot.
Description
Technical Field
The invention relates to the field of alloys, in particular to a titanium alloy cast ingot, a preparation method thereof and a titanium alloy product.
Background
The titanium alloy has the characteristics of high strength, high fracture toughness, high hardenability and the like, is widely applied to the fields of aviation, aerospace and the like, and is particularly applied to large-size key structural parts such as landing gear of an airplane; with the development of the fields of aviation, aerospace and the like, stricter indexes are provided for the performance of the titanium alloy. Wherein, the uniformity of the titanium alloy cast ingot influences the plasticity, fatigue performance and the like of the structural member.
The uniformity of the titanium alloy cast ingot prepared by the traditional method is low, so that the plasticity and fatigue performance of the titanium alloy are reduced. Therefore, the preparation method of the titanium alloy cast ingot, which can effectively improve the uniformity, has important significance.
Disclosure of Invention
Based on the above, the invention provides a titanium alloy cast ingot with better uniformity, a preparation method thereof and a titanium alloy product.
The technical scheme for solving the technical problems is as follows.
A preparation method of a titanium alloy cast ingot comprises the following steps:
sequentially carrying out first smelting, second smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy cast ingot; the chemical components of the titanium alloy consumable electrode comprise iron element; the first smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-25 Gs; the second smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-30 Gs; the third smelting adopts an alternating-current stirring magnetic field, and the magnetic field strength is 12 Gs-30 Gs.
In some embodiments, in the method for preparing a titanium alloy ingot, the magnetic field direction conversion period of the alternating-current stirring magnetic field is 8S-20S.
In some embodiments, in the method for preparing the titanium alloy ingot, the current of the first smelting is 10 KA-25 KA, and the voltage is 25V-35V.
In some embodiments, in the method for preparing the titanium alloy ingot, the current of the second smelting is 10 KA-30 KA, and the voltage is 25V-38V.
In some embodiments, in the method for preparing the titanium alloy ingot, the current of the third smelting is 10 KA-27 KA, and the voltage is 22V-35V.
In some of these embodiments, the chemical composition of the titanium alloy consumable electrode comprises elemental iron in the method of making a titanium alloy ingot.
In some embodiments, in the method for preparing a titanium alloy ingot, the material of the titanium alloy consumable electrode is TB6 titanium alloy.
In some of these embodiments, the titanium alloy ingot has a diameter of 580mm to 880mm.
In some embodiments, the method for producing a titanium alloy ingot further comprises, after the first melting step, a step of flattening the ingot obtained by the first melting.
In some embodiments, the method for producing a titanium alloy ingot further comprises, after the step of smelting the second time, a step of flattening the ingot obtained by smelting the second time.
In some embodiments, the method for preparing a titanium alloy ingot, the preparation of the titanium alloy consumable electrode comprises the steps of:
uniformly mixing titanium sponge, VAlFe and AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode blocks in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
Correspondingly, the invention provides a titanium alloy cast ingot, which is prepared by the preparation method of the titanium alloy cast ingot.
The invention provides a titanium alloy product, and the preparation raw materials of the titanium alloy product comprise the titanium alloy cast ingot.
Compared with the prior art, the preparation method of the titanium alloy cast ingot has the following beneficial effects:
the preparation method of the titanium alloy ingot comprises the steps of sequentially carrying out first smelting, second smelting and third smelting on a titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace, respectively controlling the rotation direction of a molten pool during the first smelting, the second smelting and the third smelting by adopting a direct current stirring magnetic field and an alternating current stirring magnetic field, and respectively controlling the magnetic field intensity of the first smelting, the second smelting and the third smelting to control the rotation speed of the molten pool; the method comprises the steps of carrying out primary smelting by adopting a direct-current stirring magnetic field with specific strength, and enabling a molten pool to rotate along a single direction, so that impurities in a titanium alloy consumable electrode can be effectively removed, and the influence of the impurities on the uniformity of a titanium alloy ingot casting structure is avoided; further, a direct current stirring magnetic field with specific strength is adopted for secondary smelting, the molten pool rotates violently, the generated centrifugal force can effectively promote flattening of the molten pool, and the melt is dispersed to the side part of the ingot with relatively deficient solute, so that iron elements which are easy to gather in the center part of the titanium alloy ingot are effectively prevented from being segregated and accumulated in the center part of the titanium alloy ingot, and further, the uniformity of iron element distribution in the titanium alloy ingot is effectively improved; on the basis, the alternating-current stirring magnetic field with specific strength is adopted for third smelting, the back and forth rotation amplitude of the molten pool is small, the solidification process can be kept stable, and the defect of microstructure which cannot be eliminated by forging is avoided; the steps and the parameters are combined, so that the uniformity of the titanium alloy ingot is effectively improved.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to specific embodiments. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The weights of the relevant components mentioned in the description of the embodiments of the present invention may refer not only to the specific contents of the components, but also to the proportional relationship between the weights of the components, so long as the contents of the relevant components in the description of the embodiments of the present invention are scaled up or down within the scope of the disclosure of the embodiments of the present invention. Specifically, the weight described in the specification of the embodiment of the present invention may be mass units known in the chemical industry field such as μ g, mg, g, kg.
Vacuum consumable arc melting is one of the main melting modes for preparing titanium alloy ingots. The power supply system of the vacuum consumable arc furnace not only applies smelting current to melt the consumable electrode, but also applies an axial stirring magnetic field to play roles in stirring a molten pool and stabilizing an electric arc. Wherein the stirring magnetic field comprises a direct current magnetic field and an alternating magnetic field; the magnetic field direction of the direct current magnetic field is unchanged, and the molten pool rotates under the magnetic field force with the unchanged direction, so that the melt in the molten pool is stirred; the direction of the alternating magnetic field changes periodically, and the melt in the molten pool is stirred back and forth under the action of alternating force.
Technical staff find in the research process that the reason that the uniformity of the titanium alloy cast ingot prepared by the traditional method is lower is that Fe segregation is extremely easy to form in the titanium alloy, and finally beta spots are formed, so that the plasticity and fatigue performance of structural members can be reduced when the titanium alloy cast ingot is used for preparing large-size structures such as landing gear of an airplane.
An embodiment of the invention provides a preparation method of a titanium alloy cast ingot, which comprises the following steps:
sequentially carrying out first smelting, second smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy cast ingot; the chemical components of the titanium alloy consumable electrode comprise iron element; the first smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-25 Gs; the second smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field strength is 12 Gs-30 Gs.
Technicians try to adopt an alternating-current stirring magnetic field to perform primary smelting, but impurities cannot be effectively removed after the primary smelting, so that the macro-micro component tissue uniformity of a subsequent titanium alloy cast ingot is affected, and a certain risk is brought to the tissue component uniformity of a finished cast ingot; the second smelting is tried by adopting an alternating-current stirring magnetic field, the alternating-current stirring magnetic field is more stable than a molten pool of a direct-current stirring magnetic field, and flash formed by the titanium alloy cast ingot after the second smelting is lower; however, the alternating-current stirring magnetic field is adopted for secondary smelting, the titanium alloy contains 2 percent of iron element which is extremely easy to segregate, segregation is easy to form, beta spots are finally formed, and the plasticity and fatigue performance of the structural member are reduced; and attempting to perform third smelting by adopting a direct-current stirring magnetic field, wherein the molten pool rotates along a single direction, so that the uniformity of macroscopic components in the titanium alloy cast ingot is improved, but the uniformity of microscopic components is reduced, a small amount of streamline microscopic metallurgical defects occur, the defects cannot be eliminated in the ordinary forging process, and the risks are brought to the quality of products.
The invention controls the rotation direction of the molten pool during the first smelting, the second smelting and the third smelting respectively by adopting a direct current stirring magnetic field and an alternating current stirring magnetic field, and controls the rotation speed of the molten pool by controlling the magnetic field intensity of the first smelting, the second smelting and the third smelting respectively; the method comprises the steps of carrying out primary smelting by adopting a direct-current stirring magnetic field with specific strength, and enabling a molten pool to rotate along a single direction, so that impurities in a titanium alloy consumable electrode can be effectively removed, and the influence of the impurities on the uniformity of a titanium alloy ingot casting is avoided; further, a direct current stirring magnetic field with specific strength is adopted for secondary smelting, the molten pool rotates violently, and generated centrifugal force can effectively promote the melt to be dispersed to the side part of the ingot with relatively deficient solute, so that iron element segregation which is easy to gather in the center part of the titanium alloy ingot is effectively prevented from accumulating in the center part of the titanium alloy ingot, and further the uniformity of iron element distribution in the titanium alloy ingot is effectively improved; on the basis, the alternating-current stirring magnetic field with specific strength is adopted for third smelting, the back and forth rotation amplitude of the molten pool is small, the stability of the solidification process can be maintained, and the defect of microstructure which cannot be eliminated by forging is avoided; the steps and the parameters are combined, so that the uniformity of the titanium alloy ingot is effectively improved.
Experimental research shows that if the magnetic field strength is too high, when the melt is stirred too severely, arc short circuit between a molten pool and a consumable electrode is easy to occur; the strength of the magnetic field is too small, and the stirring force is insufficient, so that the uniformity of the titanium alloy cast ingot is affected.
It is understood that the magnetic field strength of the first smelting includes, but is not limited to, 10Gs, 11Gs, 12Gs, 13Gs, 14Gs, 15Gs, 16Gs, 18Gs, 20Gs, 21Gs, 22Gs, 23Gs, 24Gs, 25Gs; the magnetic field strength of the second smelting includes, but is not limited to, 10Gs, 11Gs, 12Gs, 13Gs, 14Gs, 15Gs, 16Gs, 18Gs, 20Gs, 21Gs, 22Gs, 23Gs, 24Gs, 25Gs, 28Gs, 30Gs; the magnetic field strength of the third smelting includes, but is not limited to, 12Gs, 13Gs, 14Gs, 15Gs, 16Gs, 18Gs, 20Gs, 21Gs, 22Gs, 23Gs, 24Gs, 25Gs, 28Gs, 30Gs.
In some examples, the first melting has a magnetic field strength of 13Gs to 14Gs in the method of producing the titanium alloy ingot.
In some examples, the second melting has a magnetic field strength of 10Gs to 28Gs.
In some examples, the third melting has a magnetic field strength of 22Gs to 25Gs.
In some examples, in the method for producing a titanium alloy ingot, the magnetic field direction conversion period of the alternating-current stirring magnetic field is 8S to 20S.
It is understood that the magnetic field direction changing period of the alternating stirring magnetic field includes, but is not limited to, 8S, 10S, 12S, 14S, 15S, 16S, 18S, 20S.
In some examples, in the preparation method of the titanium alloy ingot, in the later stage of the third smelting step, when the residual mass of the titanium alloy consumable electrode smelting is 150 Kg-350 Kg, the feeding stage is started, the strength of an alternating-current stirring magnetic field in the feeding stage is 12 Gs-20 Gs, and the stirring period is 8S-20S.
In some examples, the first smelting current is 10 KA-25 KA and the voltage is 25V-35V.
It is understood that the current of the first smelting includes, but is not limited to, 10KA, 13KA, 14KA, 15KA, 16KA, 18KA, 20KA, 22KA, 24KA, 25KA; voltages include, but are not limited to, 25V, 27V, 28V, 30V, 32V, 34V, 35V.
In some examples, the second smelting current is 10 KA-30 KA and the voltage is 25V-38V.
It is understood that the current of the second smelting includes, but is not limited to, 10KA, 13KA, 14KA, 15KA, 16KA, 18KA, 20KA, 22KA, 24KA, 25KA, 28KA, 30KA; voltages include, but are not limited to, 25V, 27V, 28V, 30V, 32V, 34V, 35V, 38V.
In some examples, in the method for preparing the titanium alloy ingot, the current for the third smelting is 10 KA-27 KA, and the voltage is 22V-35V.
It is understood that the current of the third smelting includes, but is not limited to, 10KA, 13KA, 14KA, 15KA, 16KA, 18KA, 20KA, 21KA, 23KA, 24KA, 25KA, 27KA; voltages include, but are not limited to, 22V, 25V, 27V, 28V, 29V, 30V, 32V, 34V, 35V.
In some examples, the chemical composition of the titanium alloy consumable electrode comprises elemental iron in the method of making the titanium alloy ingot.
The iron element can improve the strength and plasticity of the titanium alloy; and after the first smelting and the second smelting are carried out by adopting the direct-current stirring magnetic field, the third smelting is carried out by adopting the alternating-current stirring magnetic field, so that the melt can be effectively promoted to be dispersed to the side part of the ingot with relatively deficient solute, thereby effectively avoiding the segregation accumulation of the iron element which is easy to gather in the center part of the titanium alloy ingot, and further effectively improving the uniformity of the iron element distribution in the titanium alloy ingot.
In some examples, the material of the titanium alloy consumable electrode is TB6 titanium alloy.
In some examples, the titanium alloy ingot is 580mm to 880mm in diameter.
The diameter of the titanium alloy cast ingot prepared by the preparation method of the titanium alloy cast ingot can reach 580 mm-880 mm, and the raw material is provided for large-size structural members.
In some examples, the method of producing a titanium alloy ingot further comprises, after the first melting step, a step of flattening the ingot obtained by the first melting.
In some examples, the method of producing a titanium alloy ingot further comprises, after the step of performing the second melting, a step of flattening the ingot obtained by the second melting.
In some examples, in the method for producing a titanium alloy ingot, the crucible used is increased stepwise as the first, second and third times of smelting are performed.
In some examples, the specifications of the crucible are selected from Φ420, Φ500, Φ580, Φ680, Φ780, Φ880 in the method of producing a titanium alloy ingot.
It will be appreciated that when a crucible of size Φ580 is used for the first smelting, the crucible size for the second smelting may be Φ680, Φ780; when the crucible size used for the second melting is Φ680, the crucible size used for the third melting may be Φ780, Φ880.
In some examples, in a method of making a titanium alloy ingot, the making of a titanium alloy consumable electrode includes the steps of:
uniformly mixing titanium sponge, VAlFe and AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode blocks in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
In some examples, the titanium sponge is selected from at least one of grade 1, grade 0, and grade 0A.
In some examples, in the preparation method of the titanium alloy consumable electrode, the intermediate alloy of titanium sponge, VAlFe and AlV is selected according to the component requirements of the TB6 titanium alloy in national standard GB 3620.1.
In some examples, the density of the electrode block is 3.40g/cm to 3.50g/cm in the method of preparing the titanium alloy consumable electrode.
It is understood that the density of the electrode pieces includes, but is not limited to, 3.40g/cm, 3.42g/cm, 3.44g/cm, 3.45g/cm, 3.46g/cm, 3.47g/cm, 3.48g/cm, 3.50g/cm.
The embodiment of the invention provides a titanium alloy ingot, which is prepared by the preparation method of the titanium alloy ingot.
The titanium alloy cast ingot prepared by the preparation method has good uniformity.
An embodiment of the invention provides an application of the titanium alloy cast ingot in preparing a titanium alloy product. Another embodiment of the present invention provides a titanium alloy article, the starting material of which comprises a titanium alloy ingot comprising the above.
The titanium alloy cast ingot is used for preparing titanium alloy products, and can endow the titanium alloy products with higher plasticity and fatigue performance.
In some of these embodiments, the titanium alloy article includes, but is not limited to, aircraft landing gear, automotive castings, wire and cable, cross-rail profiles, electrodes.
In some embodiments, the titanium alloy article may be prepared from the titanium alloy ingots described above, i.e., the titanium alloy articles may be prepared directly from the titanium alloy ingots described above. In other embodiments, the starting materials for preparing the titanium alloy article may include other materials in addition to the titanium alloy ingots described above.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The following examples of the titanium alloy ingot, the method for producing the same, and the titanium alloy product according to the present invention, it is to be understood that the titanium alloy ingot, the method for producing the same, and the titanium alloy product according to the present invention are not limited to the following examples.
Example 1
Preparation of a phi 580 mm-specification TB6 titanium alloy cast ingot:
selecting 1-level sponge titanium, VAlFe and AlV intermediate alloy, uniformly mixing, preparing a phi 340-specification TB6 pressed electrode (nominal component Ti-10V-2Fe-3 Al), welding, and smelting in a vacuum consumable arc furnace for three times: the smelting current of the first smelting is 13KA, the smelting voltage is 27V, and the direct current stirring magnetic field strength is 13Gs; the smelting current of the second smelting is 20KA, the smelting voltage is 30V, and the direct-current stirring magnetic field strength is 15Gs; the smelting current of the third smelting is 20KA, the smelting voltage is 29V, the alternating-current stirring magnetic field strength is 25Gs, and the stirring period is 10S; carrying out flat head treatment on the cast ingot after each smelting, turning around, and carrying out next smelting; the crucible adopted in each smelting is gradually increased: the specification of the crucible for the first smelting is phi 420mm, the specification of the crucible for the second smelting is phi 500mm, and the specification of the crucible for the third smelting is phi 580mm.
Example 2:
preparation of phi 680 mm-specification TB6 titanium alloy cast ingot:
0-level sponge titanium, VAlFe and AlV intermediate alloy are selected and uniformly mixed to prepare a phi 420-specification TB6 pressed electrode (nominal component Ti-10V-2Fe-3 Al), and after welding, three times of smelting are carried out in a vacuum consumable arc furnace: the smelting current of the first smelting is 14KA, the smelting voltage is 27V, and the direct-current stirring magnetic field strength is 14Gs; the smelting current of the second smelting is 20KA, the smelting voltage is 30V, and the direct-current stirring magnetic field strength is 18Gs; the smelting current of the third smelting is 21KA, the smelting voltage is 30V, the alternating-current stirring magnetic field strength is 22Gs, and the stirring period is 14S; carrying out flat head treatment on the cast ingot after each smelting, turning around, and carrying out next smelting; the crucible adopted in each smelting is gradually increased: the specification of the crucible for the first smelting is phi 500mm, the specification of the crucible for the second smelting is phi 580mm, and the specification of the crucible for the third smelting is phi 680mm.
Example 3:
substantially the same as in example 2, except that: the "direct-current stirring magnetic field strength was 18Gs" in the second smelting in example 2 was replaced with "direct-current stirring magnetic field strength was 10Gs".
Example 4:
substantially the same as in example 2, except that: the "direct-current stirring magnetic field strength was 18Gs" in the second smelting in example 2 was replaced with "direct-current stirring magnetic field strength was 28Gs".
Example 5:
preparation of a phi 780 mm-specification TB6 titanium alloy cast ingot:
0-level sponge titanium, VAlFe and AlV intermediate alloy are selected and uniformly mixed to prepare a phi 480-specification TB6 pressed electrode (nominal component Ti-10V-2Fe-3 Al), and after welding, three times of smelting are carried out in a vacuum consumable arc furnace: the smelting current of the first smelting is 16KA, the smelting voltage is 28V, and the direct-current stirring magnetic field strength is 14Gs; the smelting current of the second smelting is 22KA, the smelting voltage is 32V, and the direct-current stirring magnetic field strength is 28Gs; the smelting current of the third smelting is 23KA, the smelting voltage is 27V, the alternating-current stirring magnetic field strength is 24Gs, and the stirring period is 18S; carrying out flat head treatment on the cast ingot after each smelting, turning around, and carrying out next smelting; the crucible adopted in each smelting is gradually increased: the specification of the crucible for the first smelting is phi 580mm, the specification of the crucible for the second smelting is phi 680mm, and the specification of the crucible for the third smelting is phi 780mm.
Example 6
Substantially the same as in example 2, except that: in the first smelting, the direct-current stirring magnetic field strength is 25Gs; in the second smelting, the direct-current stirring magnetic field strength is 10Gs; in the third smelting, the alternating-current stirring magnetic field strength is 30Gs, and the stirring period is 8S.
Example 7
Substantially the same as in example 2, except that: in the first smelting, the direct-current stirring magnetic field strength is 10Gs; in the second smelting, the direct-current stirring magnetic field strength is 30Gs; in the third smelting, the alternating-current stirring magnetic field strength is 12Gs, and the stirring period is 20S.
Comparative example 1
Substantially the same as in example 1, except that: the "direct-current stirring magnetic field strength was 15Gs" in the second smelting in example 1 was replaced with "alternating-current stirring magnetic field strength was 15Gs, and the stirring period was 10S".
Comparative example 2:
substantially the same as in example 2, except that: the "direct-current stirring magnetic field strength was 18Gs" in the second smelting in example 2 was replaced with "alternating-current stirring magnetic field strength was 18Gs" and the stirring period was 12S ".
Comparative example 3:
substantially the same as in example 3, except that: the "direct-current stirring magnetic field strength was 10Gs" in the second smelting in example 3 was replaced with "alternating-current stirring magnetic field strength was 10Gs" and the stirring period was 12S ".
Comparative example 4:
substantially the same as in example 4, except that: the second melting in example 4 was replaced with "28 Gs DC stirring magnetic field strength" and "28 Gs AC stirring magnetic field strength" and the stirring period was 12S ".
Comparative example 5:
substantially the same as in example 5, except that: the second melting in example 5 was replaced with "28 Gs DC stirring magnetic field strength" and "28 Gs AC stirring magnetic field strength" and the stirring period was 15S ".
Comparative example 6:
substantially the same as in example 5, except that: the third smelting in example 5 was replaced with "24 Gs in the AC stirring magnetic field strength and 18S in the stirring period".
Some of the parameters in the preparation of titanium alloy ingots for each example and comparative example are shown in table 1.
TABLE 1
Detection of segregation conditions of easily segregated elements:
the titanium alloy ingots prepared in each example and comparative example were sawed at the head of 100mm, sawed at the bottom of 100mm, sawed at the middle of the rest of the ingots, 4 parts of scraps were sampled at the edge and the center of the above 3 sawed sections of the titanium alloy ingots, the segregation of the corresponding Fe element was tested, and the average value of the data of each position was shown in Table 2 below.
TABLE 2
Element segregation is mainly reflected by the content difference of the elements at the side part and the core part of the ingot; the molten pool is stirred along the axial direction in a rotating way, and the segregation condition of elements with the same section can react with the segregation. As can be seen from table 2, when direct current stirring current is adopted in the second smelting, compared with the comparative examples with the same diameter, the difference of the edge and the center of the easily segregated Fe element on the cross section of the cast ingot in the examples is smaller, and the component distribution is obviously more uniform; comparative example 6, a third smelting with a dc stirring magnetic field, showed a small amount of streamline metallurgical defects.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which facilitate a specific and detailed understanding of the technical solutions of the present invention, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. It should be understood that, based on the technical solutions provided by the present invention, those skilled in the art may obtain technical solutions through logical analysis, reasoning or limited experiments, which are all within the scope of protection of the appended claims. The scope of the patent of the invention should therefore be determined with reference to the appended claims, which are to be construed as in accordance with the doctrines of claim interpretation.
Claims (9)
1. The preparation method of the titanium alloy cast ingot is characterized by comprising the following steps:
sequentially carrying out first smelting, second smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy cast ingot; the first smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 10 Gs-14 Gs; the second smelting adopts a direct-current stirring magnetic field, and the magnetic field strength is 15 Gs-30 Gs; the third smelting adopts an alternating-current stirring magnetic field, and the magnetic field strength is 12 Gs-25 Gs; the material of the titanium alloy consumable electrode is TB6 titanium alloy.
2. The method for producing a titanium alloy ingot according to claim 1, wherein the alternating-current stirring magnetic field has a magnetic field direction conversion period of 8S to 20S.
3. The method for producing a titanium alloy ingot according to claim 1, wherein the method comprises at least one of the following features (1) to (3):
(1) The current of the first smelting is 10 KA-25 KA, and the voltage is 25V-35V;
(2) The current of the second smelting is 10 KA-30 KA, and the voltage is 25V-38V;
(3) The current of the third smelting is 10 KA-27 KA, and the voltage is 22V-35V.
4. The method for producing a titanium alloy ingot according to any one of claims 1 to 3, wherein the chemical component of the titanium alloy consumable electrode contains iron.
5. The method for producing a titanium alloy ingot according to any one of claims 1 to 3, wherein the diameter of the titanium alloy ingot is 580mm to 880mm.
6. The method for producing a titanium alloy ingot according to any one of claims 1 to 3, further comprising a step of flattening the ingot obtained by the first melting after the first melting step; and/or
After the step of smelting for the second time, the method further comprises the step of flattening the cast ingot obtained by smelting for the second time.
7. A method for producing a titanium alloy ingot according to any one of claims 1 to 3, wherein the production of the titanium alloy consumable electrode comprises the steps of:
uniformly mixing titanium sponge, VAlFe and AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode blocks in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
8. A titanium alloy ingot, characterized in that it is prepared by the method for preparing a titanium alloy ingot according to any one of claims 1 to 7.
9. A titanium alloy article, wherein the starting material for the preparation of the titanium alloy article comprises the titanium alloy ingot of claim 8.
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