GH5605 cobalt-based high-temperature alloy and manufacturing method thereof

Abstract

The invention relates to a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof, and belongs to the technical field of metal smelting. The GH5605 alloy comprises the following chemical components: 0.05%-0.15% of C, less than or equal to 1.0% of Si, 1.0%-2.0% of Mn, less than or equal to 0.03% of S, less than or equal to 0.03% of P, 19.0%-21.0% of Cr, 9.0%-11.0% of Ni, 14.0%-16.0% of W, less than or equal to 3.0% of Fe and the balance of Co and other inevitable impurities. According to the manufacturing method, the GH5605 electrode bar is smelted through a vacuum induction furnace, refining and argon protection processes are adopted, and it is ensured that the Mn element content of the electrode bar is qualified. And in the vacuum consumable remelting process, argon with the pressure of 2000-3000 Pa is filled, so that the vacuum degree is reduced, Mn element volatilization is effectively inhibited, and section component uniformity is achieved. Detection shows that the Mn content at the edge, the 1 / 2 radius and the central part of the steel ingot meets the technical standard. The process is simple and efficient, the quality of molten steel is not affected, the performance consistency and production stability of the GH5605 steel ingot are remarkably improved, and the process is suitable for the high-end application field.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof. Background Art

[0002] GH5605 is a solid solution strengthened cobalt-based high temperature alloy that exhibits excellent strength and oxidation resistance below 850°C and is widely used in aviation, nuclear power and other fields. Its production usually adopts vacuum induction + electroslag remelting process. However, in some special applications, in order to meet higher performance requirements, it is necessary to use vacuum induction + vacuum consumable process to produce steel ingots.

[0003] After forging Φ220mm forging material with 5000 ton fast forging machine, 20mm thick samples were taken from the head and tail of the forging material, and the chemical composition was analyzed at the 1 / 2 radius of each sample cross section. It was found that the Mn element was qualified, but the content was reduced; the chemical composition was analyzed at the center of each sample cross section, and it was found that the Mn element was reduced beyond the standard lower limit and was unqualified. The Mn element content decreased from the edge to the center of the sample. The Mn element at the edge (equivalent to the surface of the ingot) met the technical standard requirements, and the Mn element in the center was unqualified. The chemical composition analysis results are shown in Table 0.

[0004] Table 0 Mn content in different parts of GH5605 alloy forgings (wt%)

[0005] By analyzing the reasons for the unqualified Mn content, it is found that the reason is the volatilization of Mn in the vacuum consumable process of the steel ingot. Because during vacuum consumable remelting, the edge of the metal molten pool that solidifies first has less Mn volatilization, resulting in a high Mn content on the surface of the steel ingot after solidification; the center of the steel ingot that solidifies later has more Mn volatilization, resulting in unqualified Mn content in the center of the steel ingot. Since the solidification of the metal molten pool is a process of gradually solidifying from the edge to the center, the volatilization of Mn gradually increases from the edge to the center, resulting in a decrease in Mn in the steel ingot from the surface to the center. Even unqualified phenomena occur.

[0006] Under existing technical conditions, the vacuum consumable process has the following significant problems: Volatilization problem of Mn element: Mn is a key component in GH5605 alloy, and its content directly affects the mechanical properties and high temperature resistance of the material. However, due to its high vapor pressure under high temperature and high vacuum conditions, Mn is prone to volatilization. During the vacuum consumable remelting process, the molten metal pool gradually solidifies from the edge to the center, resulting in uneven distribution of Mn volatilization from small to large, serious volatilization in the center, and even causing the Mn content in the center to be lower than the lower limit of the technical standard. This uneven distribution makes the steel ingot unable to meet the material performance requirements during subsequent processing.

[0007] The cross-sectional composition is not uniform: In the traditional vacuum consumable process, the Mn content at the edge of the ingot usually meets the standard, but the Mn content in the center is often unqualified due to excessive volatilization. The gradient difference of the Mn content in the cross section of the ingot directly affects the composition consistency of the forging material and weakens the overall performance of the material. This unevenness limits the further processing and high-end application of the ingot.

[0008] Insufficient process control: The existing vacuum consumable remelting process does not fully consider the volatility characteristics of the Mn element, and only relies on conventional operations under high vacuum conditions, lacking effective means of volatilization inhibition. This not only makes it difficult to control the Mn content in production, but also increases the unqualified rate and cost of steel ingots. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a GH5605 cobalt-based high-temperature alloy to solve the problems of uneven cross-sectional distribution of Mn elements, insufficient Mn content in the central part, and the resulting degradation of material properties and instability in conventional cobalt-based high-temperature alloys in the prior art.

[0010] In order to overcome the defects of the above-mentioned prior art, the present invention provides a GH5605 cobalt-based high-temperature alloy, the chemical composition of the alloy is: C: 0.05%-0.15%, Si: ≤1.0%, Mn: 1.0%-2.0%, S: ≤0.03%, P: ≤0.03%, Cr: 19.0%-21.0%, Ni: 9.0%-11.0%, W: 14.0%-16.0%, Fe: ≤3.0%, and the balance is Co and other inevitable impurities.

[0011] Compared with the prior art, the GH5605 cobalt-based high-temperature alloy of the present application has the following advantages: In the composition control of the GH5605 cobalt-based high-temperature alloy of the present invention, by optimizing the composition, the GH5605 alloy not only overcomes the problem of uneven cross-sectional composition distribution in the prior art, but also significantly improves the comprehensive performance of the alloy, including hardness, ductility and high temperature resistance, and provides reliable material guarantee for special applications in high-end fields such as nuclear power and aviation. The specific reasons and principles for controlling each component are as follows: Optimized Mn content range (1.0%-2.0%): Mn is an important component of GH5605 alloy, and its content directly affects the mechanical properties of the material and its stability in high temperature environments. The composition of the present invention can significantly improve the plasticity and toughness of the alloy by precisely controlling the Mn content, especially showing stronger fatigue resistance in high stress environments. At the same time, a moderate Mn content can also effectively enhance the crack resistance and forging performance of the steel ingot, avoiding the problem of decreased hardness in the center due to insufficient Mn;

[0012] Precisely control the carbon (C) content range (0.05%-0.15%): C is an important factor in alloy strengthening, but too high a C content will increase the brittleness of the material, while too low a C content will not fully improve the high-temperature strength of the alloy. The composition of the present invention limits the C content to 0.05%-0.15%, thereby achieving strengthening while avoiding the embrittlement effect, providing the alloy with an excellent balance of strength and ductility; Strictly limit sulfur (S) and phosphorus (P) content (≤0.03%) S and P are harmful impurities, and high contents of these impurities will weaken the toughness of the alloy and reduce its high-temperature fatigue resistance. The present invention effectively avoids the problem of crack sensitivity by strictly controlling the S and P contents to ≤0.03%, thereby significantly improving the processing performance and service life of the alloy.

[0013] High Cr and W content (Cr: 19.0%-21.0%, W: 14.0%-16.0%) Cr and W, as the main solid solution strengthening elements, respectively improve the oxidation resistance and high temperature strength of GH5605 alloy. High Cr content ensures that the alloy has excellent corrosion resistance under high temperature conditions, while high W content significantly enhances the dimensional stability of the material under extreme temperatures through solid solution strengthening and grain refinement.

[0014] Balance between Ni and Fe (Ni: 9.0%-11.0%, Fe: ≤3.0%) The precise proportion of Ni components enhances the toughness and oxidation resistance of GH5605 alloy, while the appropriate amount of Fe improves the processing performance of the alloy, further enhancing the high-temperature weldability and industrial adaptability of the material.

[0015] In a possible embodiment, the chemical composition of the alloy is: C: 0.063%, Si: 0.23%, Mn: 1.60%, S: 0.003%, P: 0.004%, Cr: 20.11%, Ni: 10.24%, W: 14.88%, Fe: 0.46%, and the remainder is Co and other inevitable impurities.

[0016] Compared with the existing technology, the above technical scheme further optimizes the alloy composition ratio, significantly improves the uniformity of cross-sectional composition, effectively improves the high-temperature strength and ductility of the alloy, and significantly reduces the material crack sensitivity, further meeting the consistency and reliability requirements of material performance in the fields of nuclear power, aviation, etc.

[0017] Another technical problem to be solved by the present invention is to provide a method for manufacturing GH5605 cobalt-based high-temperature alloy to solve the problems of severe volatilization of Mn element, uneven composition of the cross-section of the steel ingot, and poor production stability in the conventional manufacturing method in the prior art.

[0018] In order to overcome the above defects of the prior art, the present invention provides a method for manufacturing the GH5605 cobalt-based high-temperature alloy, comprising the following steps: S1: vacuum induction smelting electrode rod; Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded as raw materials into a vacuum induction furnace, and the above metals are melted under the premise of vacuuming. When the temperature reaches above 1500°C, all the metal materials are melted, and vacuuming is continued and preliminary refining is started. Then, samples are taken for chemical composition analysis. After the proportion of the remaining elements except Mn is qualified, argon gas is filled, and then metal manganese is added. After refining, the molten steel is poured into an ingot mold, demolded after the mold is cooled, and air-cooled to room temperature to obtain an electrode rod; S2: electrode rod polishing; The electrode rod is polished until the surface has a metallic luster; S3: Vacuum self-consumable production of steel ingots; The electrode rod is placed in a vacuum consumable furnace, and remelting is started under the premise of evacuating the vacuum. Argon is filled in the remelting process to reduce the vacuum degree, and the pressure is maintained until the end of smelting. After cooling treatment, a GH5605 vacuum consumable steel ingot is obtained.

[0019] Compared with the prior art, the present invention discloses a manufacturing method of GH5605 cobalt-based high-temperature alloy, which has the following advantages: by improving the manufacturing method, the present invention effectively solves the problems of uneven composition and Mn volatilization in the production of GH5605 alloy in the prior art, and finally achieves the consistency and stability of the performance of the steel ingot, which is particularly suitable for the stringent requirements of high-end application scenarios such as nuclear power and aviation. The specific principles include: Effective control of Mn volatilization: In the vacuum induction smelting stage, the manufacturing method of the present invention effectively reduces the oxidation and volatilization loss of Mn by filling argon gas after refining and quickly adding the Mn element; in the vacuum consumable remelting stage, the vacuum degree in the molten pool is reduced by accurately controlling the argon pressure (2000-3000Pa), further reducing Mn volatilization and ensuring the uniformity of the cross-sectional composition of the steel ingot; Precise composition control and improved smelting stability: Through gradual vacuuming and refining operations, the loss of high vapor pressure elements such as Cr and W is minimized; the temperature, vacuum degree and protective atmosphere during smelting and remelting are precisely controlled, which significantly improves the stability of the production process and the consistency of composition; Improved cross-sectional composition uniformity: During the remelting process, the metal molten pool gradually solidifies under the protection of argon gas, which significantly reduces the composition differences at the edge, 1 / 2 radius and center of the steel ingot; the Mn content of each part of the steel ingot obtained by the manufacturing method of the present invention meets the technical standards, thus overcoming the problem that the Mn content of the central part is lower than the standard in the prior art; Reduce energy consumption and improve yield rate: The manufacturing method of the present invention adopts efficient refining and cooling treatment in key steps, which reduces smelting time and energy consumption; the optimized process flow significantly reduces the scrap rate caused by uneven composition during the production process, and improves the yield rate and economic benefits.

[0020] In a possible implementation, after step S3 is completed, step S4 component detection is also included, and step S4 includes: cutting a sample from the steel ingot processed in step S3, and detecting the Mn element content by spectral analysis to ensure that the Mn element content of the steel ingot cross section meets the composition requirement of 1.0-2.0%.

[0021] Compared with the prior art, the above technical scheme uses spectral analysis with high precision and high sensitivity, and can quickly and accurately detect the Mn element content in different cross-sectional positions of the steel ingot. By cutting samples from the steel ingot, the composition distribution of the cross section of the steel ingot is comprehensively analyzed to ensure the uniformity of the cross-sectional composition. In addition, a composition detection step is added after vacuum consumable remelting to provide feedback basis for the smelting process, which helps to further optimize the remelting parameters, thereby maximizing the stability and consistency of the finished product performance.

[0022] In a possible implementation, in step S1, the condition for evacuating the vacuum is: evacuating the vacuum until the vacuum degree in the vacuum induction furnace is less than 1 Pa, and the condition for continuing evacuating the vacuum is: evacuating the vacuum until the vacuum degree in the vacuum induction furnace is less than 0.1 Pa.

[0023] Compared with the prior art, the above technical solution, after preliminarily removing the impurity gas in a vacuum environment of less than 1Pa, further vacuuming to less than 0.1Pa ensures that the oxide inclusions and dissolved gas content in the molten steel reach the lowest level, thereby significantly improving the purity and quality of the steel ingot; the initial vacuum to less than 1Pa provides the basic condition for removing most of the impurity gases, and further vacuuming to less than 0.1Pa can minimize the dissolved gas and impurities in the molten steel, thereby improving the purity of the molten steel and avoiding excessive volatilization of alloy elements (especially Mn).

[0024] In a possible implementation manner, in the step S1, the time for the preliminary refining is greater than 1 hour.

[0025] Compared with the prior art, the above technical solution can fully remove dissolved gases (such as H, O, N) and volatile impurities in the molten steel by extending the initial refining time (greater than 1 hour), and at the same time, the oxide inclusions in the molten metal pool can be fully separated from the slag, thereby improving the purity of the molten steel and making the distribution of alloy elements more uniform.

[0026] In a possible implementation, in the step S1, the time for the continued refining is 15-20 minutes, and the mold cooling time is greater than 1 hour.

[0027] Compared with the prior art, by adopting the above technical scheme, after completing the preliminary refining, the refining time is appropriately extended to 15-20 minutes, which can further remove the residual dissolved gas and a small amount of inclusions in the molten steel, while ensuring the uniform distribution of the Mn element in the molten steel, reducing volatilization and composition deviation. By extending the mold cooling time, the steel ingot is slowly cooled in the mold, fully solidifying the grain structure and reducing the internal stress, avoiding cracks or composition segregation caused by rapid cooling.

[0028] In a possible implementation, in step S3, the vacuuming condition is to evacuate the vacuum in the vacuum induction furnace to a vacuum degree less than 0.1 Pa, and the amount of argon gas charged is 2000-3000 Pa.

[0029] Compared with the prior art, the above technical solution is adopted to effectively remove residual gas and impurities in the furnace in a high vacuum environment by evacuating to a vacuum degree of less than 0.1Pa, reduce the influence of dissolved gas (such as O, H, N) on the quality of molten steel, and provide good base conditions for argon protection; and further inject argon gas, and appropriate amount of argon protection can reduce the vacuum degree of the molten pool, inhibit the volatilization of high vapor pressure elements (such as Mn, Cr), and maintain the fluidity and composition uniformity of the molten steel.

[0030] In a possible implementation manner, in step S3, the cooling treatment condition is: after cooling for 1 hour, the vacuum state is terminated, and air cooling is continued to the room temperature.

[0031] Compared with the existing technology, the above technical scheme is adopted to extend the vacuum cooling time (1 hour) to ensure that the thermal stress of the steel ingot is evenly released in the vacuum environment, effectively avoiding surface oxidation or internal thermal stress concentration problems caused by premature destruction of the vacuum. After the vacuum is terminated, the continued air cooling method provides a milder cooling environment, preventing the steel ingot structure from having component segregation or grain coarsening due to rapid cooling. DETAILED DESCRIPTION

[0032] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0033] The invention provides a GH5605 cobalt-based high-temperature alloy. The chemical composition of the alloy is: C: 0.05%-0.15%, Si: ≤1.0%, Mn: 1.0%-2.0%, S: ≤0.03%, P: ≤0.03%, Cr: 19.0%-21.0%, Ni: 9.0%-11.0%, W: 14.0%-16.0%, Fe: ≤3.0%, and the balance is Co and other inevitable impurities.

[0034] As a preferred solution, the chemical composition of the alloy is: C: 0.063%, Si: 0.23%, Mn: 1.60%, S: 0.003%, P: 0.004%, Cr: 20.11%, Ni: 10.24%, W: 14.88%, Fe: 0.46%, and the remainder is Co and other inevitable impurities.

[0035] The present invention also provides a method for manufacturing the GH5605 cobalt-based high-temperature alloy, comprising the following steps: S1: vacuum induction smelting electrode rod; Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded as raw materials into a vacuum induction furnace, and the above metals are melted under the premise of vacuuming. When the temperature reaches above 1500°C, all the metal materials are melted, and vacuuming is continued and preliminary refining is started. Then, samples are taken for chemical composition analysis. After the proportion of the remaining elements except Mn is qualified, argon gas is filled, and then metal manganese is added. After refining, the molten steel is poured into an ingot mold, demolded after the mold is cooled, and air-cooled to room temperature to obtain an electrode rod; S2: electrode rod polishing; The electrode rod is polished until the surface has a metallic luster; S3: Vacuum self-consumable production of steel ingots; The electrode rod is placed in a vacuum consumable furnace, and remelting is started under the premise of evacuating the vacuum. Argon is filled in the remelting process to reduce the vacuum degree, and the pressure is maintained until the end of smelting. After cooling treatment, a GH5605 vacuum consumable steel ingot is obtained; As a preferred solution, after step S3 is completed, step S4 component detection is also included, and step S4 includes: cutting a sample from the steel ingot processed in step S3, and detecting the Mn element content by spectral analysis to ensure that the Mn element content of the steel ingot cross section meets the composition requirement of 1.0-2.0%.

[0036] The basic principle adopted by the above-mentioned manufacturing method of the present invention is: because the Mn element has a high vapor pressure under high vacuum and high temperature, it is very volatile. The vacuum consumable remelting conditions of GH5605 are carried out under high temperature and high vacuum conditions. Therefore, when remelting GH5605 under traditional high vacuum, the Mn element in the alloy causes the Mn content of the steel ingot to decrease due to volatilization. After the metal molten pool is formed during the remelting process, the surface of the steel ingot solidifies first at the edge of the molten pool under forced cooling of the water-cooled crystallizer, and then gradually solidifies toward the center of the molten pool to finally form a steel ingot. The edge part that solidifies first has less Mn volatilization, and the center part solidifies later, resulting in more Mn volatilization, which causes the Mn content on the surface of the steel ingot to be higher than that in the core, and even causes the core Mn to volatilize too much and be lower than the standard lower limit.

[0037] In order to reduce the volatilization of Mn element, the manufacturing method of the present invention reduces the vacuum degree by filling argon gas during vacuum consumables to prevent the volatilization of Mn element, thereby obtaining a GH5605 steel ingot with qualified Mn element content and a small difference in Mn content between the edge and the center. Since argon gas is an inert gas and is insoluble in molten steel, it has no effect on the quality of the steel ingot. This method better solves the problem of unqualified Mn element in GH5605 vacuum consumable ingots.

[0038] As a preferred solution, in step S1, the condition for vacuuming is: vacuuming until the vacuum degree in the vacuum induction furnace is less than 1 Pa, and the condition for continuing vacuuming is: vacuuming until the vacuum degree in the vacuum induction furnace is less than 0.1 Pa.

[0039] As a preferred solution, in step S1, the time of the preliminary refining is greater than 1 hour.

[0040] As a preferred solution, in step S1, the time for continued refining is 15-20 minutes, and the mold cooling time is greater than 1 hour.

[0041] As a preferred solution, in step S3, the vacuuming condition is to evacuate the vacuum in the vacuum induction furnace to a vacuum degree less than 0.1 Pa, and the amount of argon gas charged is 2000-3000 Pa.

[0042] As a preferred solution, in step S3, the cooling treatment condition is: after cooling for 1 hour, the vacuum state is terminated, and air cooling is continued to the room temperature.

[0043] The following is a further explanation and description of the above-mentioned technical solutions of the present invention in combination with specific data: Embodiment 1: The present embodiment provides a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof. The GH5605 cobalt-based high-temperature alloy includes the following components: C: 0.05%, Si: 0.15%, Mn: 1.0%, S: 0.02%, P: 0.01%, Cr: 19.0%, Ni: 9.0%, W: 14.0%, Fe: 2.5%, and the balance is Co and other inevitable impurities.

[0044] The manufacturing method comprises the following steps: S1: Vacuum induction smelting electrode rod Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded into a vacuum induction furnace as raw materials. After the vacuum is evacuated to a vacuum degree of less than 1Pa, it is sent for electric heating. When the metal is completely melted and the temperature reaches above 1500℃, the vacuum is continued to be evacuated to a vacuum degree of less than 0.1Pa for preliminary refining, and the refining time is 1 hour. Then the chemical composition is sampled and analyzed. When the proportion of other elements except Mn is qualified, argon gas is filled to 2000Pa, and metal manganese is added. After refining for 15 minutes, the steel is tapped and the molten steel is poured into an ingot mold. The mold cooling time is more than 1 hour. After demolding, it is air-cooled to room temperature to obtain an electrode rod.

[0045] S2: Electrode polishing The electrode rod is polished to give a metallic luster to the surface and to remove surface oxide scale and impurities.

[0046] S3: Vacuum self-consumption production of steel ingots The polished electrode rods were loaded into a vacuum consumable furnace, and remelting began after the vacuum was evacuated to less than 0.1Pa. During the remelting process, argon was filled to 3000Pa and the pressure was maintained until the end of smelting. After cooling for 1 hour, the vacuum state was terminated and air-cooled to room temperature to obtain GH5605 vacuum consumable steel ingots.

[0047] S4: Ingredient Testing 20mm thick samples were cut from the head and tail of the ingot respectively, and the Mn content in the edge, 1 / 2 radius and center of the ingot was detected by spectral analysis. The results showed that the Mn content in all parts of the cross section was 1.0%, which met the technical standard requirements.

[0048] The test results show that the prepared GH5605 cobalt-based high-temperature alloy has excellent cross-sectional composition uniformity, and its high-temperature strength and corrosion resistance meet the application requirements in the nuclear power and aviation fields.

[0049] Table 1 Test results of Mn element of GH5605 steel ingot in Example 1 (wt%)

[0050] Embodiment 2: The present embodiment provides a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof. The GH5605 cobalt-based high-temperature alloy includes the following components: C: 0.15%, Si: 1.0%, Mn: 2.0%, S: 0.03%, P: 0.03%, Cr: 21.0%, Ni: 11.0%, W: 16.0%, Fe: 3.0%, and the balance is Co and other inevitable impurities.

[0051] The manufacturing method comprises the following steps: S1: Vacuum induction smelting electrode rod Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded into a vacuum induction furnace as raw materials. After evacuation to a vacuum degree of less than 1Pa, electric heating is performed. When the metal is completely melted and the temperature reaches above 1500°C, evacuation is continued to be performed to a vacuum degree of less than 0.1Pa for preliminary refining. The refining time is 1.5 hours. After sampling and analyzing the chemical composition, argon gas is filled to 2500Pa, and metal manganese is added. After refining for 20 minutes, the steel is tapped and the molten steel is poured into an ingot mold. The mold cooling time is 1.5 hours. After demolding, the electrode rod is air-cooled to room temperature to obtain.

[0052] S2: Electrode polishing The electrode rod is polished to give a metallic luster to the surface and to remove surface oxide scale and impurities.

[0053] S3: Vacuum self-consumption production of steel ingots The polished electrode rods were loaded into a vacuum consumable furnace, and remelting began after the vacuum was evacuated to less than 0.1Pa. During the remelting process, argon was filled to 3000Pa and the pressure was maintained until the end of smelting. After cooling for 1 hour, the vacuum state was terminated and air-cooled to room temperature to obtain GH5605 vacuum consumable steel ingots.

[0054] S4: Ingredient Testing The test results show that the Mn content in all parts of the ingot cross section is 2.0%, the composition is highly uniform, and meets the technical standards.

[0055] Table 2 Test results of Mn element of GH5605 steel ingot in Example 2 (wt%)

[0056] Embodiment 3: The present embodiment provides a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof. The GH5605 cobalt-based high-temperature alloy includes the following components: C: 0.063%, Si: 0.23%, Mn: 1.60%, S: 0.003%, P: 0.004%, Cr: 20.11%, Ni: 10.24%, W: 14.88%, Fe: 0.46%, and the balance is Co and other inevitable impurities.

[0057] The manufacturing method comprises the following steps: S1: Vacuum induction smelting electrode rod Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded into a vacuum induction furnace as raw materials. After evacuation to a vacuum degree of less than 1Pa, electric heating is performed. When the metal is completely melted and the temperature reaches above 1500°C, evacuation is continued to be performed to a vacuum degree of less than 0.1Pa for preliminary refining. The refining time is 1 hour. After sampling and analyzing the chemical composition, argon gas is filled to 2800Pa, and metal manganese is added. After refining for 18 minutes, the steel is tapped and the molten steel is poured into an ingot mold. The mold cooling time is 1 hour. After demolding, the electrode rod is air-cooled to room temperature to obtain.

[0058] S2: Electrode polishing The electrode rod is polished to give a metallic luster to the surface and to remove surface oxide scale and impurities.

[0059] S3: Vacuum self-consumption production of steel ingots The polished electrode rods were loaded into a vacuum consumable furnace, and remelting began after the vacuum was evacuated to less than 0.1Pa. During the remelting process, argon was filled to 2000Pa and the pressure was maintained until the end of smelting. After cooling for 1 hour, the vacuum state was terminated and air-cooled to room temperature to obtain GH5605 vacuum consumable steel ingots.

[0060] S4: Ingredient Testing The test results are shown in Table 3. The Mn content in each part of the ingot cross section is greater than 1.50%, the composition is evenly distributed, and all mechanical properties meet the technical requirements.

[0061] Table 3 Test results of Mn element of GH5605 steel ingot in Example 3 (wt%)

[0062] According to the above embodiments, it is further proved that the present invention provides a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof. The manufacturing method of the present invention effectively controls the volatilization of the Mn element in the GH5605 steel ingot by optimizing process parameters and argon protection measures, thereby ensuring the uniformity of the cross-sectional composition of the steel ingot and the compliance with technical standards.

[0063] As shown in Table 1-3, the Mn content of the GH5605 steel ingot produced in Examples 1-3 at different sampling locations (the head, the edge of the tail, the 1 / 2 radius and the core) is maintained within the technical standard range of 1.0%-2.0%, and the composition distribution is uniform, and both the head and the tail are qualified. This shows that the method of the present invention overcomes the problem of the Mn content in the center being lower than the standard due to Mn volatilization in the prior art.

[0064] The core technical principle of the present invention is that the volatilization of Mn element is effectively reduced by accurately controlling the vacuum degree, refining time and argon filling amount in the vacuum induction smelting stage; in the vacuum consumable remelting stage, the vacuum degree is reduced by maintaining the argon pressure of 2000-3000Pa, further suppressing the occurrence of volatilization. At the same time, by extending the vacuum cooling time and gradually terminating the vacuum state during the cooling process, the composition segregation and thermal stress problems caused by rapid cooling during the cooling process are avoided. Finally, the present invention successfully achieves the composition uniformity and performance consistency of GH5605 cobalt-based high-temperature alloy, significantly improves the high-temperature strength and corrosion resistance of the material, and provides a more reliable high-performance material solution for high-end fields such as nuclear power and aviation.

[0065] According to the above principles, similar embodiments made by ordinary technicians in this field on other brands and varieties are all within the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are all within the scope of protection of the pending claims of the present invention.

[0066] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A GH5605 cobalt-based high-temperature alloy, characterized in that: The chemical composition of the alloy is: C: 0.05%-0.15%, Si: ≤1.0%, Mn: 1.0%-2.0%, S: ≤0.03%, P: ≤0.03%, Cr: 19.0%-21.0%, Ni: 9.0%-11.0%, W: 14.0%-16.0%, Fe: ≤3.0%, and the balance is Co and other inevitable impurities.

2. The GH5605 cobalt-based high-temperature alloy according to claim 1, characterized in that: The chemical composition of the alloy is: C: 0.063%, Si: 0.23%, Mn: 1.60%, S: 0.003%, P: 0.004%, Cr: 20.11%, Ni: 10.24%, W: 14.88%, Fe: 0.46%, and the remainder is Co and other inevitable impurities.

3. A method for manufacturing the GH5605 cobalt-based high-temperature alloy according to any one of claims 1 or 2, characterized in that: The following steps are involved: S1: vacuum induction smelting electrode rod; Metal chromium, nickel plate, metal tungsten and metal cobalt are loaded as raw materials into a vacuum induction furnace, and the above metals are melted under the premise of vacuuming. When the temperature reaches above 1500°C, all the metal materials are melted, and vacuuming is continued and preliminary refining is started. Then, samples are taken for chemical composition analysis. After the proportion of the remaining elements except Mn is qualified, argon gas is filled, and then metal manganese is added. After refining, the molten steel is poured into an ingot mold, demolded after the mold is cooled, and air-cooled to room temperature to obtain an electrode rod; S2: electrode rod polishing; The electrode rod is polished until the surface has a metallic luster; S3: Vacuum self-consumable production of steel ingots; The electrode rod is placed in a vacuum consumable furnace, and remelting is started under the premise of evacuating the vacuum. Argon is filled in the remelting process to reduce the vacuum degree, and the pressure is maintained until the end of smelting. After cooling treatment, a GH5605 vacuum consumable steel ingot is obtained.

4. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: After step S3 is completed, step S4 component detection is also included, and step S4 includes: cutting a sample from the steel ingot processed in step S3, and detecting the Mn element content by spectral analysis to ensure that the Mn element content of the cross section of the steel ingot meets the component requirement of 1.0-2.0%.

5. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: In the step S1, the condition for evacuating the vacuum is: evacuating the vacuum until the vacuum degree in the vacuum induction furnace is less than 1 Pa, and the condition for continuing evacuating the vacuum is: evacuating the vacuum until the vacuum degree in the vacuum induction furnace is less than 0.1 Pa.

6. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: In the step S1, the time of the preliminary refining is greater than 1 hour.

7. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: In the step S1, the time for continuing refining is 15-20 minutes, and the time for mold cooling is greater than 1 hour.

8. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: In the step S3, the vacuuming condition is to evacuate until the vacuum degree in the vacuum induction furnace is less than 0.1 Pa, and the filling amount of the argon gas is 2000-3000 Pa.

9. The method for manufacturing the GH5605 cobalt-based high-temperature alloy according to claim 3, characterized in that: In step S3, the cooling treatment condition is: after cooling for 1 hour, the vacuum state is terminated, and air cooling is continued to the room temperature.

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