CN115584405A - Titanium alloy ingot, preparation method thereof and titanium alloy product - Google Patents
Titanium alloy ingot, preparation method thereof and titanium alloy product Download PDFInfo
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- CN115584405A CN115584405A CN202211318580.XA CN202211318580A CN115584405A CN 115584405 A CN115584405 A CN 115584405A CN 202211318580 A CN202211318580 A CN 202211318580A CN 115584405 A CN115584405 A CN 115584405A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 154
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 238000003723 Smelting Methods 0.000 claims abstract description 130
- 238000003756 stirring Methods 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000002844 melting Methods 0.000 claims description 34
- 230000008018 melting Effects 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 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 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005204 segregation Methods 0.000 description 10
- 238000005266 casting Methods 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- 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
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 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
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000007858 starting material Substances 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)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a titanium alloy ingot and a preparation method thereof, and a titanium alloy product, wherein the preparation method of the titanium alloy ingot comprises the following steps: sequentially carrying out primary smelting, secondary smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy ingot; wherein, the first smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-25 Gs; the second smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field intensity is 12 Gs-30 Gs. The titanium alloy ingot prepared by the method can effectively improve the uniformity of the titanium alloy ingot.
Description
Technical Field
The invention relates to the field of alloys, in particular to a titanium alloy 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 members such as aircraft landing gears and the like; with the development of the fields of aviation, aerospace and the like, more strict indexes are provided for the performance of the titanium alloy. Among them, the uniformity of the titanium alloy ingot affects the plasticity, fatigue property, etc. of the structural member.
The titanium alloy ingot prepared by the traditional method has low uniformity, so that the plasticity and fatigue property of the titanium alloy are reduced. Therefore, the preparation method of the titanium alloy ingot capable of effectively improving the uniformity is of great significance.
Disclosure of Invention
Based on the method, the invention provides the titanium alloy ingot with better uniformity, the preparation method thereof and the titanium alloy product.
The technical scheme of the invention for solving the technical problems is as follows.
A preparation method of a titanium alloy ingot comprises the following steps:
sequentially carrying out primary smelting, secondary smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy ingot; the chemical components of the titanium alloy consumable electrode comprise iron elements; the first smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-25 Gs; the second smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field intensity is 12 Gs-30 Gs.
In some embodiments, in the method for preparing the titanium alloy ingot, the magnetic field direction change period of the alternating-current stirring magnetic field is 8S-20S.
In some embodiments, in the preparation method of the titanium alloy ingot, the current of the first smelting is 10-25 KA, and the voltage is 25-35V.
In some embodiments, in the preparation method of the titanium alloy ingot, the current of the second smelting is 10KA to 30KA, and the voltage is 25V to 38V.
In some embodiments, in the preparation method of the titanium alloy ingot, the current of the third smelting is 10-27 KA, and the voltage is 22-35V.
In some of the embodiments, in the method for preparing a titanium alloy ingot, the chemical composition of the titanium alloy consumable electrode comprises iron.
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 the embodiments, in the method of manufacturing a titanium alloy ingot, the titanium alloy ingot has a diameter of 580mm to 880mm.
In some embodiments, the method for preparing the titanium alloy ingot further comprises the step of performing flat head treatment on the ingot obtained by the first smelting after the first smelting step.
In some embodiments, the method for preparing the titanium alloy ingot further comprises the step of performing flat head treatment on the ingot obtained by the second smelting after the step of performing the second smelting.
In some embodiments, the method for preparing a titanium alloy ingot comprises the following steps:
uniformly mixing the titanium sponge, the VAlFe and the AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode block in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
Correspondingly, the invention provides a titanium alloy ingot prepared by the preparation method of the titanium alloy ingot.
The invention provides a titanium alloy product, and the raw materials for preparing the titanium alloy product comprise the titanium alloy ingot.
Compared with the prior art, the preparation method of the titanium alloy ingot has the following beneficial effects:
the preparation method of the titanium alloy ingot adopts a vacuum consumable arc melting furnace to sequentially carry out primary melting, secondary melting and third melting on a titanium alloy consumable electrode, respectively controls the rotating directions of a molten pool during the primary melting, the secondary melting and the third melting by adopting a direct current stirring magnetic field and an alternating current stirring magnetic field, and respectively controls the magnetic field intensity of the primary melting, the secondary melting and the third melting to control the rotating speed of the molten pool; the method comprises the following steps of firstly smelting by adopting a direct-current stirring magnetic field with specific strength, wherein a molten pool rotates 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 structural uniformity of a titanium alloy ingot is avoided; further adopting a direct-current stirring magnetic field with specific strength to carry out secondary smelting, wherein the molten pool rotates violently, the generated centrifugal force can effectively promote the flattening of the molten pool, and the melt is dispersed to the edge of the ingot casting with relatively deficient solute, so that the segregation of iron elements which are easy to gather in the core of the titanium alloy ingot casting is effectively prevented from accumulating in the core of the titanium alloy ingot casting, and the uniformity of the distribution of the iron elements in the titanium alloy ingot casting is effectively improved; on the basis, an alternating current stirring magnetic field with specific strength is adopted for carrying out third smelting, the back-and-forth rotation amplitude of a molten pool is small, the solidification process can be kept stable, and the microstructure defect which cannot be eliminated by forging is avoided; the uniformity of the titanium alloy ingot is effectively improved under the combined action of all the steps and the parameters.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. It is to 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to 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 relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and 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 electrode electric arc furnace not only applies melting current to melt the consumable electrode, but also applies an axial stirring magnetic field to play roles in stirring a molten pool and stabilizing electric arcs. 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 the alternating force.
The technical personnel find in the research process that the reason that the uniformity of the titanium alloy ingot prepared by the traditional method is low is that iron element in the titanium alloy is easy to form Fe segregation and finally forms beta spots, and when the titanium alloy ingot is used for preparing large-size structures such as airplane landing gears and the like, the plasticity and fatigue performance of structural parts are reduced.
An embodiment of the present invention provides a method for producing a titanium alloy ingot, including the steps of:
sequentially carrying out primary smelting, secondary smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy ingot; the chemical components of the titanium alloy consumable electrode comprise iron elements; the first smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-25 Gs; the second smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field intensity is 12 Gs-30 Gs.
Technical personnel try to adopt an alternating-current stirring magnetic field for primary smelting, but impurities cannot be effectively removed after the primary smelting, so that the macro-micro component structure uniformity of a subsequent titanium alloy ingot is influenced, and certain risk is brought to the component uniformity of a finished ingot; an alternating-current stirring magnetic field is adopted for secondary smelting, a molten pool of the alternating-current stirring magnetic field is more stable than that of a direct-current stirring magnetic field, and the flash formed by the titanium alloy ingot after secondary smelting is lower; but the secondary smelting is carried out by adopting an alternating-current stirring magnetic field, the titanium alloy contains 2 percent of iron element which is easy to segregate, segregation is easy to form, beta spots are formed finally, and the plasticity and the fatigue property of the structural part are reduced; and a direct current stirring magnetic field is tried to carry out the third smelting, a molten pool rotates along a single direction, the homogeneity of macro components in the titanium alloy ingot is improved, but the homogeneity of micro components is reduced, a small amount of streamline micro metallurgical defects appear, and the streamline micro metallurgical defects cannot be eliminated in the common forging process, so that the risk is brought to the product quality.
The rotating directions of a molten pool during the first smelting, the second smelting and the third smelting are respectively controlled by adopting a direct-current stirring magnetic field and an alternating-current stirring magnetic field, and the rotating speed of the molten pool is controlled by respectively controlling the magnetic field intensity of the first smelting, the second smelting and the third smelting; the method comprises the following steps of firstly smelting by adopting a direct-current stirring magnetic field with specific strength, wherein a molten pool rotates 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 is avoided; further adopting a direct current stirring magnetic field with specific strength to carry out secondary smelting, wherein a molten pool rotates violently, and the generated centrifugal force can effectively promote the melt to disperse to the edge of the ingot casting with relatively deficient solute, thereby effectively avoiding the segregation of iron elements which are easy to gather in the core of the titanium alloy ingot casting from accumulating in the core of the titanium alloy ingot casting, and further effectively improving the uniformity of the distribution of the iron elements in the titanium alloy ingot casting; on the basis, an alternating current stirring magnetic field with specific strength is adopted for carrying out third smelting, the back-and-forth rotation amplitude of a molten pool is small, the stability of the solidification process can be kept, and the microstructure defect which cannot be eliminated by forging is avoided; the uniformity of the titanium alloy ingots is effectively improved under the combined action of all the steps and parameters.
Experimental research finds that if the magnetic field intensity is too large, and the melt is stirred too violently, an electric arc short circuit between a molten pool and a consumable electrode is easily caused; and the magnetic field intensity is too small, and the stirring force is insufficient, so that the uniformity of the titanium alloy ingot is influenced.
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 intensity of the second smelting comprises but is not limited to 10Gs, 11Gs, 12Gs, 13Gs, 14Gs, 15Gs, 16Gs, 18Gs, 20Gs, 21Gs, 22Gs, 23Gs, 24Gs, 25Gs, 28Gs and 30Gs; the magnetic field intensity of the third smelting comprises but is not limited to 12Gs, 13Gs, 14Gs, 15Gs, 16Gs, 18Gs, 20Gs, 21Gs, 22Gs, 23Gs, 24Gs, 25Gs, 28Gs and 30Gs.
In some examples, in the preparation method of the titanium alloy ingot, the magnetic field intensity of the first smelting is 13 Gs-14 Gs.
In some examples, in the preparation method of the titanium alloy ingot, the magnetic field intensity of the second smelting is 10 Gs-28 Gs.
In some examples, in the preparation method of the titanium alloy ingot, the magnetic field intensity of the third smelting is 22 Gs-25 Gs.
In some examples, in the method for producing a titanium alloy ingot, the period of the magnetic field direction change 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, and 20S.
In some examples, in the preparation method of the titanium alloy ingot, after the third smelting step is carried out, when the residual mass of the titanium alloy consumable electrode in smelting is 150 Kg-350 Kg, the feeding stage is carried out, the intensity of the alternating current stirring magnetic field in the feeding stage is 12 Gs-20 Gs, and the stirring period is 8S-20S.
In some examples, in the preparation method of the titanium alloy ingot, the current for the first smelting is 10KA to 25KA, and the voltage is 25V to 35V.
It is understood that the current for the first melting 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, in the preparation method of the titanium alloy ingot, the current for the second smelting is 10 KA-30 KA, and the voltage is 25V-38V.
It is understood that the current for the second pass 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 preparation method of the titanium alloy ingot, the current for the third smelting is 10-27 KA, and the voltage is 22-35V.
It is understood that the current for the third melting 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, a titanium alloy ingot is produced by a method in which a chemical composition of a titanium alloy consumable electrode includes iron.
The iron element can improve the strength and the 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 dispersion of the melt to the edge part of the ingot with relatively deficient solute can be effectively promoted, the accumulation of the iron element segregation which is easily accumulated in the center part of the titanium alloy ingot can be effectively avoided, and the uniformity of the distribution of the iron element in the titanium alloy ingot can be effectively improved.
In some examples, in the preparation method of the titanium alloy ingot, the material of the titanium alloy consumable electrode is TB6 titanium alloy.
In some of these examples, a titanium alloy ingot is produced by a method in which the titanium alloy ingot has a diameter of 580mm to 880mm.
The diameter of the titanium alloy ingot prepared by the preparation method of the titanium alloy ingot can reach 580-880 mm, and raw materials are provided for large-size structural members.
In some examples, the method for preparing the titanium alloy ingot further comprises the step of performing flat head treatment on the ingot obtained by the first smelting after the first smelting step.
In some examples, the method for preparing the titanium alloy ingot further comprises the step of performing flat head treatment on the ingot obtained by the second smelting after the step of performing the second smelting.
In some examples, in the method for producing a titanium alloy ingot, the crucible used is gradually increased when the first melting, the second melting, and the third melting are performed.
In some examples, the method for preparing a titanium alloy ingot comprises selecting a crucible having a gauge selected from the group consisting of Φ 420, Φ 500, Φ 580, Φ 680, Φ 780, and Φ 880.
It can be understood that when the first melting adopts a crucible with the specification of phi 580, the crucible used for the second melting can be in the specifications of phi 680 and phi 780; when the crucible specification used for the second melting is phi 680, the crucible specification used for the third melting can be phi 780 and phi 880.
In some examples, in the preparation method of the titanium alloy ingot, the preparation of the titanium alloy consumable electrode comprises the following steps:
uniformly mixing the titanium sponge, the VAlFe and the AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode block in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
In some examples, the titanium alloy consumable electrode is made by a method in which 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, sponge titanium, VAlFe and AlV intermediate alloy are selected according to the requirements of the national standard GB3620.1 on the components of TB6 titanium alloy.
In some examples, in the preparation method of the titanium alloy consumable electrode, the density of the electrode block is 3.40 g/cm-3.50 g/cm.
It is understood that the density of the electrode block 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.
An embodiment of the invention provides a titanium alloy ingot prepared by the preparation method of the titanium alloy ingot.
The titanium alloy ingot prepared by the preparation method of the titanium alloy ingot has good uniformity.
An embodiment of the invention provides application of the titanium alloy ingot in preparation of a titanium alloy product. In another embodiment of the present invention, a titanium alloy product is provided, and a raw material for preparing the titanium alloy product comprises the titanium alloy ingot.
The titanium alloy ingot is used for preparing a titanium alloy product, and can endow the titanium alloy product 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 raw material for preparing the titanium alloy product can be the titanium alloy ingot, i.e., the titanium alloy ingot is directly used for preparing the titanium alloy product. In other embodiments, the starting materials for the production of the titanium alloy article may include other materials in addition to the titanium alloy ingot described above.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Hereinafter, the titanium alloy ingot, the method for producing the same, and the titanium alloy product according to the present invention will be described by way of example, but 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
Preparing a phi 580mm specification TB6 titanium alloy ingot:
selecting grade 1 sponge titanium, VAlFe and AlV intermediate alloy, uniformly mixing, preparing a phi 340 specification TB6 pressing 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 intensity is 13Gs; the smelting current of the second smelting is 20KA, the smelting voltage is 30V, and the direct-current stirring magnetic field intensity is 15Gs; the smelting current of the third smelting is 20KA, the smelting voltage is 29V, the alternating-current stirring magnetic field intensity is 25Gs, and the stirring period is 10S; after each smelting, performing flat head treatment on the cast ingot, turning around, and performing the next smelting; the crucible used for each smelting is gradually increased: the crucible specification of the first smelting is phi 420mm, the crucible specification of the second smelting is phi 500mm, and the crucible specification of the third smelting is phi 580mm.
Example 2:
preparing a TB6 titanium alloy ingot with the phi 680mm specification:
selecting 0-grade sponge titanium, VAlFe and AlV intermediate alloy, uniformly mixing, preparing a phi 420-specification TB6 pressing 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 14KA, the smelting voltage is 27V, and the direct-current stirring magnetic field intensity is 14Gs; the smelting current of the second smelting is 20KA, the smelting voltage is 30V, and the direct-current stirring magnetic field intensity is 18Gs; the smelting current of the third smelting is 21KA, the smelting voltage is 30V, the alternating-current stirring magnetic field intensity is 22Gs, and the stirring period is 14S; after each smelting, performing flat head treatment on the cast ingot, turning around, and performing the next smelting; the crucible used for 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:
essentially the same as in example 2, except that: the "direct-current stirring magnetic field strength of 18Gs" in the second melting in example 2 was replaced with the "direct-current stirring magnetic field strength of 10Gs".
Example 4:
essentially the same as example 2, except that: the "dc agitating magnetic field strength of 18Gs" in the second melting in example 2 was replaced with "dc agitating magnetic field strength of 28Gs".
Example 5:
preparing a phi 780mm specification TB6 titanium alloy ingot:
selecting 0-grade sponge titanium, VAlFe and AlV intermediate alloy, uniformly mixing, preparing a phi 480 specification TB6 pressing 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 16KA, the smelting voltage is 28V, and the direct-current stirring magnetic field intensity is 14Gs; the smelting current of the second smelting is 22KA, the smelting voltage is 32V, and the direct-current stirring magnetic field intensity is 28Gs; the smelting current of the third smelting is 23KA, the smelting voltage is 27V, the alternating-current stirring magnetic field intensity is 24Gs, and the stirring period is 18S; after each smelting, performing flat head treatment on the cast ingot, turning around, and performing the next smelting; the crucible used for 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
Essentially the same as example 2, except that: in the first smelting, the magnetic field intensity of the direct current stirring is 25Gs; in the second smelting, the magnetic field intensity of the direct current stirring is 10Gs; in the third smelting, the intensity of the alternating-current stirring magnetic field is 30Gs, and the stirring period is 8S.
Example 7
Essentially the same as in example 2, except that: in the first smelting, the intensity of the direct-current stirring magnetic field is 10Gs; in the second smelting, the magnetic field intensity of the direct current stirring is 30Gs; in the third smelting, the intensity of the alternating-current stirring magnetic field is 12Gs, and the stirring period is 20S.
Comparative example 1
Essentially the same as in example 1, except that: in example 1, "the dc stirring magnetic field strength is 15Gs" in the second melting was replaced with "the ac stirring magnetic field strength is 15Gs, and the stirring cycle was 10S".
Comparative example 2:
essentially the same as example 2, except that: in example 2, "the dc stirring magnetic field strength is 18Gs" in the second melting was replaced with "the ac stirring magnetic field strength is 18Gs, and the stirring cycle was 12S".
Comparative example 3:
essentially the same as in example 3, except that: in example 3, "the dc stirring magnetic field strength is 10Gs" in the second melting is replaced with "the ac stirring magnetic field strength is 10Gs, and the stirring period is 12S".
Comparative example 4:
essentially the same as in example 4, except that: in the second melting in example 4, "the dc stirring magnetic field strength was 28Gs" was replaced with "the ac stirring magnetic field strength was 28Gs, and the stirring period was 12S".
Comparative example 5:
essentially the same as in example 5, except that: in the second melting in example 5, "the dc stirring magnetic field strength was 28Gs" was replaced with "the ac stirring magnetic field strength was 28Gs, and the stirring period was 15S".
Comparative example 6:
essentially the same as in example 5, except that: in the third melting in example 5, "the alternating-current stirring magnetic field strength was 24Gs and the stirring period was 18S" was replaced with "the direct-current stirring magnetic field strength was 24Gs".
Each of examples and comparative examples some of the parameters in the preparation of titanium alloy ingots are shown in Table 1.
TABLE 1
Detecting the segregation condition of the segregation-prone elements:
the titanium alloy ingots prepared in each example and comparative example were sawed 100mm at the head and 100mm at the bottom, respectively, sawed (middle) in the remaining ingots, 4 samples of chips were taken from the edge and the center of the above 3 sawed faces of the titanium alloy ingots, and the segregation of the corresponding Fe element was measured, and the average value of the data at each position is shown in table 2 below.
TABLE 2
The element segregation is mainly embodied by the content difference of the edge element and the core element of the ingot; the molten pool is stirred in an axial direction in a rotating manner, and the segregation of elements with the same section can be reflected. As can be seen from table 2, when the direct current stirring current is adopted in the second melting, compared with the comparative examples with the same diameter, no matter the head, the middle and the bottom of the ingot, the edge center difference of the easy segregation Fe element of the ingot on the cross section is smaller in the examples, and the component distribution is obviously more uniform; comparative example 6, the third melting was carried out using a dc stirring magnetic field, and a small number of streamline metallurgical defects occurred.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. It should be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the appended claims. Therefore, the protection scope of the patent of the invention is subject to the content of the appended claims, and the description can be used for explaining the content of the claims.
Claims (10)
1. A preparation method of a titanium alloy ingot is characterized by comprising the following steps:
sequentially carrying out primary smelting, secondary smelting and third smelting on the titanium alloy consumable electrode by adopting a vacuum consumable arc smelting furnace to prepare a titanium alloy ingot; the first smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-25 Gs; the second smelting adopts a direct current stirring magnetic field, and the magnetic field intensity is 10 Gs-30 Gs; the third smelting adopts an alternating current stirring magnetic field, and the magnetic field intensity is 12 Gs-30 Gs.
2. The method for producing a titanium alloy ingot according to claim 1, wherein the period of magnetic field direction change of the alternating-current stirring magnetic field is 8S to 20S.
3. The method of producing a titanium alloy ingot according to claim 1, characterized by comprising at least one of the following features (1) to (3):
(1) The current of the first smelting is 10-25 KA, and the voltage is 25-35V;
(2) The current of the second smelting is 10-30 KA, and the voltage is 25-38V;
(3) The current of the third smelting is 10-27 KA, and the voltage is 22-35V.
4. A 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 comprises iron element.
5. The method of producing a titanium alloy ingot according to claim 4, wherein the material of the titanium alloy consumable electrode is TB6 titanium alloy.
6. The method of producing a titanium alloy ingot according to any one of claims 1 to 3 and 5, wherein the diameter of the titanium alloy ingot is 580 to 880mm.
7. The method for producing a titanium alloy ingot according to any one of claims 1 to 3 and 5, further comprising, after the first melting step, a step of subjecting the ingot obtained by the first melting to a facing treatment; and/or
After the step of carrying out the second smelting, the method also comprises a step of carrying out flat head treatment on the ingot obtained by the second smelting.
8. The method of producing a titanium alloy ingot according to claims 1 to 3 and 5, wherein the production of the titanium alloy consumable electrode comprises the steps of:
uniformly mixing the titanium sponge, the VAlFe and the AlV intermediate alloy, and pressing into an electrode block;
and welding the electrode block in a vacuum plasma welding box to prepare the titanium alloy consumable electrode.
9. A titanium alloy ingot produced by the method for producing a titanium alloy ingot according to any one of claims 1 to 8.
10. A titanium alloy article characterized in that it is produced from a raw material comprising the titanium alloy ingot according to claim 9.
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