CN111763869A - Tungsten-cobalt-nickel alloy and its preparation method and application - Google Patents

Abstract

The invention provides a tungsten-cobalt-nickel alloy and a preparation method and application thereof. The tungsten-cobalt-nickel alloy comprises the following components in percentage by mass: 30-45% of tungsten, 15-25% of cobalt and 30-55% of nickel. The preparation method of the tungsten-cobalt-nickel alloy comprises the following steps: processing the raw material of the tungsten-cobalt-nickel alloy into an electrode ingot, and then processing the electrode ingot to obtain a vacuum consumable electrode; and installing the vacuum consumable electrode into a vacuum consumable furnace, and smelting to obtain the tungsten-cobalt-nickel alloy. The application of W-Co-Ni alloy in weapon manufacture. The tungsten-cobalt-nickel alloy provided by the application has the advantages that harmful gas elements such as oxygen, nitrogen and hydrogen and non-metallic inclusions are deeply removed, meanwhile, loose shrinkage cavities in the as-cast alloy are eliminated, solidification segregation is reduced, and the purification and homogenization levels of the alloy are greatly improved.

Description

Tungsten-cobalt-nickel alloy and its preparation method and application

technical field

The invention relates to the field of metallurgy, in particular to a tungsten-cobalt-nickel alloy and a preparation method and application thereof.

Background technique

The charge cover is an important component of the hollow charge warhead. The energy-gathering effect generated by the explosion of the explosive can quickly crush and deform it into a metal jet with extremely high speed and penetrating ability, so as to achieve the combat purpose of attacking armor. . Tungsten alloy is a metal material for warhead with low cost and good penetration performance. It has the advantages of high density, high strength and hardness, good plasticity and mechanical properties, etc. It is widely used in national defense construction and military industries. According to the requirements of the alloy in terms of strength, plasticity and processability, the alloy base metal needs to have an ultra-high purity and a very high level of homogenization.

Existing tungsten alloys cannot meet the requirements of related mechanical properties such as elongation, area shrinkage, tensile strength, and yield strength.

In view of this, this application is hereby made.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a tungsten-cobalt-nickel alloy and its preparation method and application to solve the above problems.

To achieve the above purpose, the present invention adopts the following technical solutions:

A tungsten-cobalt-nickel alloy, calculated by mass percentage, comprises: 30-45% tungsten, 15-25% cobalt and 30-55% nickel.

The tungsten-cobalt-nickel alloy provided in this application has a single-phase metal structure through the combination of tungsten, cobalt and nickel, and thus has excellent mechanical properties.

Optionally, in the tungsten-cobalt-nickel alloy, calculated by mass percentage, the content of tungsten can be any value between 30%, 35%, 40%, 45% and 30-45%, and the content of cobalt can be 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25% and any value between 15-25% and the nickel content can be 30 %, 35%, 40%, 45%, 50%, 55%, and any value between 30-55%.

A preparation method of described tungsten-cobalt-nickel alloy, comprising:

The raw material of the tungsten-cobalt-nickel alloy is processed into an electrode ingot, and then the electrode ingot is processed to obtain a vacuum consumable electrode;

The vacuum consumable electrode is installed in a vacuum consumable furnace, and the tungsten-cobalt-nickel alloy is obtained by smelting.

Through the vacuum consumable melting method, the deep removal of oxygen, nitrogen, hydrogen and other harmful gas elements and non-metallic inclusions in the alloy obtained by vacuum induction melting and casting can be realized, and the loose shrinkage cavity in the as-cast alloy can also be eliminated, reducing the Solidification segregation greatly improves the purification and homogenization level of the alloy.

Preferably, the electrode ingot is obtained by vacuum induction melting and casting;

Preferably, the density of the electrode ingot is 10-13 g/cm ³ ;

Preferably, the diameter of the electrode ingot is 220-250 mm.

The density of the electrode ingot determines the final high-density tungsten alloy; the control of the diameter of the electrode ingot is conducive to controlling the segregation coefficient of the alloy and improving the level of purity and homogenization of the alloy.

Optionally, the density of the ingot may be 10 g/cm ³ , 10.5 g/cm ³ , 11 g/cm ³ , 11.5 g/cm ³ , 12 g/cm ³ , 12.5 g/cm ³ , 13 g/ cm ³ and any value between 10-13 g/cm ³ ; the diameter of the ingot can be any value between 220mm, 230mm, 240mm, 250mm and 220-250mm.

Preferably, the treatment includes shaping, polishing, welding auxiliary electrodes and electrode baking in sequence;

Preferably, the electrode baking temperature is 200-300°C, and the holding time is 2.5-3.5h;

Preferably, cooling and cleaning treatments are further included after the electrode baking.

The purpose of electrode baking is to remove the water and water vapor on the surface of the ingot to the greatest extent, and to ensure that the content of H and O elements in the final alloy is extremely low.

Optionally, the temperature of the electrode baking may be 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, and 200-300°C Any value between, the holding time can be any value between 2.5h, 3h, 3.5h and 2.5-3.5h.

Preferably, the smelting comprises a preparation stage, a start-up stage, a stable smelting stage and a heat capping stage which are performed in sequence.

More preferably, in the preparation stage, the vacuum degree in the vacuum consumable furnace is controlled to be less than or equal to 0.2Pa, the air leakage rate is less than or equal to 0.4Pa/min, and the flow rate of the cooling water of the crystallizer is 600-800 mL/min.

Optionally, the vacuum degree in the vacuum consumable furnace can be any value of 0.05Pa, 0.1Pa, 0.2Pa and less than or equal to 0.2Pa; the air leakage rate can be 0.1 Pa/min, 0.2 Pa/min, 0.3 Pa/min , 0.4 Pa/min and any value less than or equal to 0.4 Pa/min; the cooling water flow rate of the crystallizer can be 600 mL/min, 650 mL/min, 700 mL/min, 750 mL/min, 800 mL/min and 600- Any value between 800 mL/min.

More preferably, the initial stage includes a high smelting current stage;

The smelting current in the high smelting current stage is 20-30% higher than the smelting current in the stable smelting stage.

The main purpose of choosing a large current in the high melting current stage is to quickly establish a molten pool.

Optionally, the smelting current of the high smelting current stage may be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, and any value between 20-30%.

More preferably, in the stable smelting stage, the vacuum degree in the vacuum consumable furnace is controlled to be less than or equal to 0.2Pa;

Preferably, in the stable smelting stage, the smelting current is controlled to be 3.0-4.5KA, and the smelting voltage is 22-25V;

Preferably, the stable melting stage controls the melting rate to be 2-3kg/min;

Preferably, the cooling water flow rate is controlled to be 600-700L/min in the stable smelting stage;

Preferably, the stable smelting stage further comprises cooling with helium;

Preferably, the flow rate of the helium gas is 400-500 mL/min;

Preferably, the smelting current in the heat capping stage is adjusted to 40%-50% of the smelting current in the stable smelting stage by gradient.

By controlling the process and parameters of vacuum consumable smelting, the removal of impurity elements and the optimization of mechanical properties are realized.

Optionally, the vacuum degree in the control vacuum consumable furnace in the stable smelting stage can be any value of 0.05Pa, 0.1Pa, 0.2Pa and less than or equal to 0.2Pa; the smelting current controlled in the stable smelting stage can be 3.0KA, Any value between 3.5KA, 4.0KA, 4.5KA and 3.0-4.5KA, the melting voltage can be any value between 22V, 23V, 24V, 25V and 22-25V; the stable melting stage controls the melting rate Can be 2kg/min, 2.1kg/min, 2.2kg/min, 2.3kg/min, 2.4kg/min, 2.5kg/min, 2.6kg/min, 2.7kg/min, 2.8kg/min, 2.9kg/min , 3kg/min and any value between 2-3kg/min; the controlled cooling water flow in the stable smelting stage can be 600L/min, 610L/min, 620L/min, 630L/min, 640L/min, 650L/min min, 660L/min, 670L/min, 680L/min, 690L/min, 700L/min and any value between 600-700L/min; the flow rate of the helium gas can be 400mL/min, 410mL/min, 420mL/min, 430mL/min, 440mL/min, 450mL/min, 460mL/min, 470mL/min, 480mL/min, 490mL/min, 500mL/min and any value between 400-500mL/min.

Preferably, the diameter of the ingot of the tungsten-cobalt-nickel alloy obtained by smelting is 280-300 mm.

The control of the diameter of the final ingot is matched with the diameter of the ingot of the consumable electrode, both to control the metallurgical quality of the alloy and improve the level of purity and homogenization of the alloy.

Optionally, the diameter of the ingot of the tungsten-cobalt-nickel alloy obtained by smelting can be any value between 280 mm, 290 mm, 300 mm and 280-300 mm.

An application of the tungsten-cobalt-nickel alloy is used in the manufacture of weapons.

The tungsten-cobalt-nickel alloy obtained in the present application has high elongation and is particularly suitable for use as a warhead for manufacturing weapons, for example, as a material for a shroud of a warhead of an armor-piercing warhead.

Compared with the prior art, the beneficial effects of the present invention include:

The tungsten-cobalt-nickel alloy provided by the application has low impurity element content, uniform composition and structure, high level of purification and homogenization of the alloy, and excellent mechanical properties;

The preparation method of tungsten-cobalt-nickel alloy provided by the present application can realize the deep removal of oxygen, nitrogen, hydrogen and other harmful gas elements and non-metallic inclusions in the alloy obtained by vacuum induction melting-casting through the vacuum consumable melting process, and can also eliminate the The loose shrinkage cavity in the as-cast alloy reduces the solidification segregation and greatly improves the purification and homogenization level of the alloy; thus obtaining a high-quality, high-density, high-tungsten, high-cobalt-nickel alloy;

The tungsten-cobalt-nickel alloy provided in this application is suitable for the manufacture of various weapons due to its excellent strength, plasticity and mechanical properties.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be considered as limiting the scope of the invention.

1 is a scanning electron microscope image of the tungsten-cobalt-nickel alloy obtained in Example 1.

Detailed ways

Terms as used herein:

"Prepared by" is synonymous with "comprising". As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article or device comprising the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such composition, step, method, article or device elements.

The conjunction "consisting of" excludes any unspecified element, step or component. If used in a claim, this phrase would make the claim closed to the exclusion of materials other than those described, but with the exception of conventional impurities associated therewith. When the phrase "consisting of" appears in a clause in the body of a claim rather than immediately following the subject matter, it is limited only to the elements described in that clause; other elements are not excluded from the description as a whole beyond the claims.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a series of upper preferred values and lower preferred values, this should be understood as specifically disclosing any upper range limit or preferred value and any lower range limit or all ranges formed by any pairing of preferred values, whether or not the ranges are individually disclosed. For example, when a range "1-5" is disclosed, the described range should be construed to include the ranges "1-4", "1-3", "1-2", "1-2 and 4-5" , "1 to 3 and 5", etc. When numerical ranges are described herein, unless stated otherwise, the ranges are intended to include the endpoints and all integers and fractions within the range.

In these examples, unless otherwise indicated, the stated parts and percentages are by mass.

"Mass part" refers to a basic measurement unit that represents the mass ratio relationship of multiple components, and 1 part can represent any unit mass, such as 1 g, 2.689 g, and the like. If we say that the mass part of the A component is a part, and the mass part of the B component is b part, it means the ratio of the mass of the A component to the mass of the B component a:b. Alternatively, the mass of the A component is aK, and the mass of the B component is bK (K is an arbitrary number, representing a multiple factor). Unmistakably, unlike parts by mass, the sum of parts by mass of all components is not limited to 100 parts by mass.

"And/or" is used to indicate that one or both of the stated circumstances may occur, eg, A and/or B includes (A and B) and (A or B).

The embodiments of the present invention will be described in detail below in conjunction with specific examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. If the specific conditions are not indicated in the examples, it is carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used without the manufacturer's indication are conventional products that can be purchased from the market.

Example 1

The present application provides a high-quality, high-density, high-tungsten, high-cobalt-nickel alloy, the chemical composition of which is 39% tungsten, 20% cobalt and 41% nickel by mass percentage;

According to the above alloy composition preparation, the alloy raw material is smelted and poured into an electrode ingot with a diameter of 240 mm in a vacuum induction furnace;

The electrode ingot is cut from the head and tail, and the surface is polished to reveal metallic luster; the auxiliary electrode is welded and baked at 250 °C for 3 hours in a heating furnace to remove water vapor; after air cooling, wipe the electrode surface with a clean rag to clean oil and oxides and other foreign bodies;

Place the treated electrode in a vacuum consumable furnace, complete the furnace loading, centering, and furnace sealing operations, pass in a cooling water flow rate of 650 mL/min, evacuate to 0.15 Pa, and detect the leakage rate of 0.2 Pa/min. After the min is qualified, power transmission and smelting begin;

After the arc is started, gradually increase the current to 4.6 kA to quickly establish a molten pool, then manually adjust the current to 3.8 kA, and the melting rate to 2.6 kg/min to enter the stable melting stage;

In the stable smelting stage, keep the vacuum degree in the consumable furnace ≤0.2 Pa, keep the smelting current 3.8±0.1 kA, keep the smelting voltage 23.7±0.1 V, keep the melting rate 2.6±0.05 kg/min, keep the cooling water flow of 650 L/min, Enter the helium flow rate of 450±20 ml/min;

Adjust the smelting current to 90%, 80%, 60%, and 40% of the normal smelting current in stages. When the remaining electrode mass is 50 kg, the power outage ends the smelting;

After cooling with the furnace for 2 hours, the ingot is taken out of the air, and the diameter of the ingot is 295 mm;

The contents of O, N, and H in the alloy measured by ONH analyzer were 14 ppm, 6 ppm, and 2 ppm, respectively.

The scanning electron microscope photo is shown in Figure 1, and there is no obvious non-metallic inclusion in the observed alloy.

The depth of molten metal pool measured by PROCAST simulation is about 132 mm, and the secondary dendrite spacing is about 70-98 μm; the segregation coefficient of W measured by electron probe is 1.09-1.17; the elongation of as-cast alloy measured by room temperature tensile test is 45.9%, the area shrinkage rate is 30.1%, the tensile strength is 623.3 Mpa, and the yield strength is 417.0 Mpa.

Example 2

The present application provides a high-quality, high-density, high-tungsten, high-cobalt-nickel alloy, the chemical composition of which is 35% tungsten, 22% cobalt and 43% nickel by mass percentage;

According to the above alloy composition preparation, the alloy raw material is smelted and poured into an electrode ingot with a diameter of 250 mm in a vacuum induction furnace;

The electrode ingot is cut from the head and tail, the surface is polished, and the metal luster leaks; the auxiliary electrode is welded and baked at 220 ℃ in the heating furnace for 3.5 hours to remove the water vapor; after the furnace is air-cooled, wipe the electrode surface with a clean rag to clean oil and oxidation foreign objects such as objects;

Place the treated electrode in a vacuum consumable furnace, complete the furnace loading, centering, and furnace sealing operations, pass in a cooling water flow rate of 750 mL/min, and evacuate to 0.20 Pa, and the detected air leakage rate is 0.4 Pa/min. After the min is qualified, power transmission and smelting begin;

After starting the arc, gradually increase the current to 5.0kA to quickly build a molten pool, then manually adjust the current to 4.2 kA, and the melting rate to 2.9kg/min to enter the stable melting stage;

In the stable smelting stage, keep the vacuum degree in the consumable furnace ≤0.2 Pa, keep the smelting current at 4.2±0.1 kA, keep the smelting voltage at 24.8±0.1 V, keep the melting rate at 2.9±0.05 kg/min, and keep the cooling water flow rate of 750 L/min. Enter the helium flow rate of 450±20 ml/min;

Adjust the smelting current to 90%, 80%, 60%, and 40% of the normal smelting current in stages. When the remaining electrode mass is 52 kg, the power outage ends the smelting;

After cooling with the furnace for 2 hours, the ingot is taken out of the air, and the diameter of the ingot is 300mm;

The content of O, N, and H in the alloy measured by ONH analyzer was 13 ppm, 5 ppm, and 2 ppm, respectively.

There is no obvious non-metallic inclusion in the alloy observed by scanning electron microscope.

The depth of molten metal pool measured by PROCAST simulation is about 141 mm, and the secondary dendrite spacing is about 72-109 μm; the segregation coefficient of W measured by electron probe is 1.09-1.20; the elongation of as-cast alloy measured by room temperature tensile test is 43.8%, the area shrinkage rate is 29.6%, the tensile strength is 618.2 Mpa, and the yield strength is 420.0 Mpa.

Example 3

The present application provides a high-quality, high-density, high-tungsten and high-cobalt-nickel alloy, the chemical composition of which is 42% tungsten, 16% cobalt and 42% nickel by mass percentage;

According to the above alloy composition preparation, the alloy raw material is smelted and poured into an electrode ingot with a diameter of 220 mm in a vacuum induction furnace;

The electrode ingot was cut to the head and tail, and the surface was polished to reveal metallic luster; the auxiliary electrode was welded and baked at 280°C for 3 hours in a heating furnace to remove water vapor; after air cooling, wipe the electrode surface with a clean rag to clean oil and oxidation foreign objects such as objects;

Place the treated electrode in a vacuum consumable furnace, complete the furnace loading, centering, and furnace sealing operations, pass in a cooling water flow rate of 600 mL/min, and evacuate to 0.10 Pa, and the detected air leakage rate is 0.3 Pa/ After the min is qualified, power transmission and smelting begin;

After starting the arc, gradually increase the current to 4.4kA to quickly build a molten pool, then manually adjust the current to 3.4 kA and the melting rate to 2.1kg/min to enter the stable melting stage;

In the stable smelting stage, keep the vacuum degree in the consumable furnace ≤0.2 Pa, keep the smelting current 3.4±0.1 kA, keep the smelting voltage 22.2±0.1 V, keep the melting rate 2.1±0.05 kg/min, keep the cooling water flow of 600 L/min, Enter the helium flow rate of 420±20 ml/min;

Adjust the smelting current to 90%, 80%, 60%, and 40% of the normal smelting current in stages. When the remaining electrode mass is 49 kg, the power outage ends the smelting;

After cooling with the furnace for 2 hours, the ingot is taken out of the air, and the diameter of the ingot is 300 mm;

The contents of O, N, and H in the alloy measured by ONH analyzer were 16 ppm, 4 ppm, and 2 ppm, respectively.

There is no obvious non-metallic inclusion in the alloy observed by scanning electron microscope.

The depth of molten metal pool measured by PROCAST simulation is about 120 mm, and the secondary dendrite spacing is about 67-94 μm; the segregation coefficient of W measured by electron probe is 1.08-1.17; the elongation of as-cast alloy measured by room temperature tensile test is 41.3%, the area shrinkage rate is 31.2%, the tensile strength is 609.7 Mpa, and the yield strength is 428.6 Mpa.

Comparative Example 1

The difference from Example 1 is that the vacuum induction furnace is directly used to smelt the alloy, and the vacuum consumable smelting method is not used. . The measured contents of O, N, and H in the alloy are 28 ppm, 10 ppm, and 3 ppm, respectively; the segregation coefficient of W is 1.15-1.31; 565.4 Mpa, yield strength is 417.1 Mpa.

From the comparison between Example 1 and Comparative Example 1, it can be seen that, using the existing vacuum induction melting process alone, the obtained alloy has a high content of impurity elements, a large segregation coefficient and poor mechanical properties.

Comparative Example 2

Different from Example 2, the melting rate in the stable smelting stage is 3.2Kg/min.

The depth of the metal molten pool measured by PROCAST simulation is about 207 mm, and the secondary dendrite spacing is about 87-135 μm.

Comparative Example 3

Different from Example 3, the melting speed in the stable smelting stage is 1.8Kg/min.

The depth of the metal molten pool measured by PROCAST simulation is about 93 mm, and the secondary dendrite spacing is about 59-83 μm; the metal molten pool is shallow, which easily causes the surface quality to deteriorate.

From the comparison of Example 2-3 and Comparative Example 2-3, it can be seen that the appropriate melting rate in the stable melting stage has a significant impact on the quality of the alloy.

The invention provides a high-quality, high-density, high-tungsten, high-cobalt-nickel alloy. The vacuum consumable smelting process adopted can effectively reduce the content of impurity elements in the alloy, reduce solidification segregation, and improve mechanical properties such as strength and plasticity of the alloy. The alloy has a single-phase metallic structure, and the density can reach 10-13 g/cm ³ .

The technical scheme of the present invention combines PROCAST simulation and industrial test research, and it is found that the impurity elements in the alloy obtained by the above process are [O]≤20 ppm, [N]≤10 ppm, [H]≤2 ppm. There are no obvious non-metallic inclusions in the consumable ingot, the depth of the molten metal pool is 120-130 mm, the secondary dendrite spacing is 50-90 μm, and the W segregation coefficient k0≤1.1. The room temperature tensile elongation of the as-cast alloy is ≥41%, the section shrinkage rate is ≥30%, the tensile strength can reach 623 Mpa, and the yield strength can reach 417 Mpa.

The excellent performance makes the tungsten-cobalt-nickel alloy provided by the present application can be used for the manufacture of weapons, especially the warhead of the weapon, for example, the material for the warhead of the armor-piercing warhead.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Furthermore, it will be understood by those skilled in the art that although some of the embodiments herein include certain features, but not others, included in other embodiments, that combinations of features of the different embodiments are intended to be within the scope of the present invention And form different embodiments. For example, in the above claims, any of the claimed embodiments may be used in any combination. The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. A tungsten-cobalt-nickel alloy is characterized by comprising the following components in percentage by mass: 30-45% of tungsten, 15-25% of cobalt and 30-55% of nickel.

2. A method of making the tungsten-cobalt-nickel alloy of claim 1, comprising:

processing the raw material of the tungsten-cobalt-nickel alloy into an electrode ingot, and then processing the electrode ingot to obtain a vacuum consumable electrode;

and installing the vacuum consumable electrode into a vacuum consumable furnace, and smelting to obtain the tungsten-cobalt-nickel alloy.

3. The preparation method according to claim 2, wherein the electrode ingot is obtained by vacuum induction melting and pouring; the density of the electrode ingot is 10-13g/cm³(ii) a The diameter of the electrode ingot is 220-250 mm.

4. The method of claim 2, wherein the processing includes shaping, polishing, welding an auxiliary electrode, and electrode baking, which are performed in this order; the baking temperature of the electrode is 200-300 ℃, and the heat preservation time is 2.5-3.5 h; the electrode baking process also includes cooling and cleaning processes.

5. The method of claim 2, wherein the smelting comprises a preparation stage, an initiation stage, a stabilization smelting stage, and a hot topping stage performed in sequence.

6. The method as claimed in claim 5, wherein in the preparation stage, the degree of vacuum in the vacuum consumable electrode furnace is controlled to be less than or equal to 0.2Pa, the gas leakage rate is controlled to be less than or equal to 0.4Pa/min, and the flow rate of cooling water in the crystallizer is controlled to be 600-.

7. The method of claim 5, wherein the initial phase comprises a high smelting current phase;

the smelting current of the high smelting current stage is 20-30% higher than that of the stable smelting stage.

8. The preparation method according to claim 5, wherein the stable smelting stage controls the vacuum degree in the vacuum consumable electrode furnace to be less than or equal to 0.2 Pa; controlling the smelting current to be 3.0-4.5KA and the smelting voltage to be 22-25V in the stable smelting stage; the melting rate is controlled to be 2-3kg/min in the stable melting stage; the flow rate of cooling water is controlled to be 600-700L/min in the stable smelting stage; the steady melting stage further comprises cooling using helium gas; the flow rate of the helium is 400-500 mL/min; and the smelting current of the heat capping stage is adjusted to be 40-50% of the smelting current of the stable smelting stage through gradient adjustment.

9. The preparation method according to any one of claims 2 to 8, wherein the ingot of the tungsten-cobalt-nickel alloy obtained by smelting has a diameter of 280-300 mm.

10. Use of the tungsten cobalt nickel alloy of claim 1 for weapon manufacture.

Images