CN116144984A - Nickel-based superalloy bar and preparation method thereof - Google Patents

Abstract

The invention provides a nickel-based high-temperature alloy rod and a preparation method thereof, which comprise the following components by weight percentage: C0.04‑0.08%, Mn0.05‑0.35%, S0.001‑0.008%, Cr10‑25 %, B0.7‑0.14%, Mo2‑5%, Cu0.3‑0.8%, Nb0.05‑0.2%, Ta0.04‑0.1%, In0.3‑0.6%, Re0.001‑0.005%, remainder The amount is Ni, by adding niobium, tantalum and indium, the alloy of the present invention has not only wear resistance, but also good oxidation resistance, corrosion resistance, and welding performance, and by adding a small amount of rhenium, the ductility of the alloy of the present invention is greatly increased Larger improvement, and can resist alkali, sulfuric acid, hydrochloric acid, dilute nitric acid and aqua regia under standard temperature and pressure. By adding a small amount of molybdenum, the crystal lattice will be greatly distorted after solid solution, and the alloy matrix will be significantly strengthened. The high-temperature strength and red hardness of the matrix can cut and reduce the network structure in the coating, and improve the cavitation and erosion resistance.

Description

A kind of nickel-based superalloy bar and its preparation method

technical field

The invention relates to the technical field of alloy preparation, in particular to a nickel-based superalloy rod and a preparation method thereof.

Background technique

Superalloys refer to high-alloyed iron-based, nickel-based or cobalt-based austenitic metal materials that can withstand high temperatures above 600°C, withstand relatively large and complex stresses, and have surface stability. Superalloys have good high-temperature strength, oxidation and corrosion resistance, excellent fatigue and creep resistance, fracture performance and structural stability, and are irreplaceable key materials for modern national defense construction and national economic development. The development of high-temperature alloys is closely related to the development of aero-engines and various industrial gas turbines. In aero-engines, they are mainly used in the four hot-end components of guides, turbine blades, turbine disks, and combustion chambers. The development of advanced superalloy materials and processes is a high-tech field. The development level of superalloys is one of the signs of a country's industrial level and one of the signs of a country's national defense strength. All advanced countries in the world attach great importance to the research, production and application of superalloys, and have invested a lot of manpower and material resources.

The 718 nickel-based superalloy produced by the prior art has defects such as low strength and weak resistance to various corrosions, and cannot meet some special requirements for use. Therefore, it is of great engineering application value and significance to further manufacture 718 nickel-based superalloy with superior comprehensive properties and to fully develop the performance potential of the alloy.

Contents of the invention

In view of the above-mentioned technical problems, the object of the present invention is to provide a nickel-based superalloy rod and a preparation method thereof.

To achieve the above object, the present invention is achieved through the following technical solutions:

A nickel-based superalloy rod, comprising the following components by weight percentage: C0.04-0.08%, Mn0.05-0.35%, S0.001-0.008%, Cr10-25%, B0.7-0.14 %, Mo2-5%, Cu0.3-0.8%, Nb0.05-0.2%, Ta0.04-0.1%, In0.3-0.6%, Re0.001-0.005%, and the balance is Ni.

Preferably, the following components are included by weight percentage: C0.04, Mn0.05, S0.001%, Cr10%, B0.7%, Mo2%, Cu0.3%, Nb0.05%, Ta0.04 %, In0.3%, Re0.001%, and the balance is Ni.

Preferably, the following components are included by weight percentage: C0.08%, Mn0.35%, S0.008%, Cr25%, B0.14%, Mo5%, Cu0.8%, Nb0.2%, Ta0 .1%, In0.6%, Re0.005%, and the balance is Ni.

Preferably, the following components are included by weight percentage: C0.06%, Mn0.12%, S0.005%, Cr23%, B0.9%, Mo4%, Cu0.7%, Nb0.09%, Ta0 .06%, In0.4%, Re0.003%, and the balance is Ni.

A method for preparing a nickel-based superalloy rod, comprising the following steps:

(1) Prepare the alloy according to the ratio of the above elements, and then smelt it in a vacuum induction furnace. The melting temperature is controlled during the smelting process: 1510°C to 1570°C. The steel is tapped at the end of the smelting stage, and the solution is cast into an alloy electrode;

(2) Carry out electroslag remelting to the alloy electrode obtained in step (1), and remelt into electroslag ingot; electroslag remelting adopts pre-melted slag, and the slag system and proportion are CaF2:Al2O3:CaO:TiO2:MgO =65:11:11:2.5:4;

(3) Carrying out vacuum consumable remelting to the electroslag ingot obtained in step (2) to obtain consumable ingot, when remelting under vacuum consumable, control melting speed to be 3.2～4.5Kg/min;

(4) performing high-temperature diffusion homogenization annealing on the consumable ingot obtained in step (3) in the range of 1100° C. to 1300° C. to obtain a homogenization annealed ingot;

(5) Heating the homogenized annealed ingot obtained in step (4) to 1100° C. to 1260° C., keeping it warm for 3 hours, and forging it into the required bar on a fast forging machine;

(6) Perform flaw detection on the bar obtained in step (5), and perform grinding on the surface to remove defects.

Preferably, the forging pressure of the fast forging machine is 4000-6000t.

The present invention has following beneficial effect:

1. The nickel-based high-temperature alloy bar and its preparation method, by adding niobium, tantalum and indium, make the alloy of the present invention not only have wear resistance, but also have good oxidation resistance, corrosion resistance and welding performance.

2. This kind of nickel-based superalloy bar and its preparation method, by adding a small amount of rhenium, the ductility of the alloy of the present invention is greatly improved, and can resist alkali, sulfuric acid, hydrochloric acid, dilute nitric acid and aqua regia.

3. This kind of nickel-based superalloy rod and its preparation method, through the action of adding a small amount of molybdenum, the crystal lattice is greatly distorted after solid solution, the alloy matrix is significantly strengthened, the high-temperature strength and red hardness of the matrix are improved, and it can be cut, Reduce the network structure in the coating and improve the ability of anti-cavitation and erosion.

Detailed ways

In order to further understand the purpose and function of the present invention, the following detailed descriptions are given in conjunction with the examples.

Example 1

In this embodiment, a nickel-based superalloy rod includes the following components by weight percentage: C0.04, Mn0.05, S0.001%, Cr10%, B0.7%, Mo2%, Cu0. 3%, Nb0.05%, Ta0.04%, In0.3%, Re0.001%, and the balance is Ni. By adding niobium, tantalum and indium, the alloy of the present invention not only has wear resistance, but also has oxidation resistance , corrosion resistance, and good welding performance. By adding a small amount of rhenium, the ductility of the alloy of the present invention is greatly improved, and it can resist alkali, sulfuric acid, hydrochloric acid, dilute nitric acid and aqua regia at standard temperature and pressure. By adding a small amount of molybdenum, the crystal lattice will undergo a large distortion after solid solution, significantly strengthen the alloy matrix, improve the high temperature strength and red hardness of the matrix, cut off and reduce the network structure in the coating, and improve the resistance to cavitation and impact. corrosion ability.

A method for preparing a nickel-based superalloy rod, comprising the following steps:

(1) Prepare the alloy according to the ratio of the above elements, and then smelt it in a vacuum induction furnace. The melting temperature is controlled during the smelting process: 1510°C to 1570°C. The steel is tapped at the end of the smelting stage, and the solution is cast into an alloy electrode;

(2) Carry out electroslag remelting to the alloy electrode obtained in step (1), and remelt into electroslag ingot; electroslag remelting adopts pre-melted slag, and the slag system and proportion are CaF2:Al2O3:CaO:TiO2:MgO =65:11:11:2.5:4;

(3) Carrying out vacuum consumable remelting to the electroslag ingot obtained in step (2) to obtain consumable ingot, when remelting under vacuum consumable, control melting speed to be 3.2～4.5Kg/min;

(4) performing high-temperature diffusion homogenization annealing on the consumable ingot obtained in step (3) in the range of 1100° C. to 1300° C. to obtain a homogenization annealed ingot;

(5) Heating the homogenized annealed ingot obtained in step (4) to 1100° C. to 1260° C., keeping it warm for 3 hours, and forging it into the required bar on a fast forging machine. The forging pressure of the fast forging machine is 4000t;

(6) Perform flaw detection on the bar obtained in step (5), and perform grinding on the surface to remove defects.

Example 2

In this embodiment, a nickel-based superalloy rod comprises the following components by weight percentage: C0.08%, Mn0.35%, S0.008%, Cr25%, B0.14%, Mo5%, Cu0.8%, Nb0.2%, Ta0.1%, In0.6%, Re0.005%, the balance is Ni, by adding niobium, tantalum and indium, the alloy of the present invention not only has wear resistance, but also Oxidation resistance, corrosion resistance, and welding performance are also good. By adding a small amount of rhenium, the ductility of the alloy of the present invention is greatly improved, and it can resist alkali, sulfuric acid, hydrochloric acid, dilute nitric acid and Wang at standard temperature and pressure. Water, through the action of adding a small amount of molybdenum, causes a large distortion of the crystal lattice after solid solution, significantly strengthens the alloy matrix, improves the high-temperature strength and red hardness of the matrix, can cut off and reduce the network structure in the coating, and improve cavitation resistance , Erosion ability.

A method for preparing a nickel-based superalloy rod, comprising the following steps:

(1) Prepare the alloy according to the ratio of the above elements, and then smelt it in a vacuum induction furnace. The melting temperature is controlled during the smelting process: 1510°C to 1570°C. The steel is tapped at the end of the smelting stage, and the solution is cast into an alloy electrode;

(2) Carry out electroslag remelting to the alloy electrode obtained in step (1), and remelt into electroslag ingot; electroslag remelting adopts pre-melted slag, and the slag system and proportion are CaF2:Al2O3:CaO:TiO2:MgO =65:11:11:2.5:4;

(3) Carrying out vacuum consumable remelting to the electroslag ingot obtained in step (2) to obtain consumable ingot, when remelting under vacuum consumable, control melting speed to be 3.2～4.5Kg/min;

(4) performing high-temperature diffusion homogenization annealing on the consumable ingot obtained in step (3) in the range of 1100° C. to 1300° C. to obtain a homogenization annealed ingot;

(5) Heating the homogenized annealed ingot obtained in step (4) to 1100° C. to 1260° C., keeping it warm for 3 hours, and forging it into the required bar on a fast forging machine. The forging pressure of the fast forging machine is 4500t;

(6) Perform flaw detection on the bar obtained in step (5), and perform grinding on the surface to remove defects.

Example 3

In this embodiment, a nickel-based superalloy rod comprises the following components by weight percentage: C0.06%, Mn0.12%, S0.005%, Cr23%, B0.9%, Mo4%, Cu0.7%, Nb0.09%, Ta0.06%, In0.4%, Re0.003%, the balance is Ni, by adding niobium, tantalum and indium, the alloy of the present invention not only has wear resistance, but also Oxidation resistance, corrosion resistance, and welding performance are also good. By adding a small amount of rhenium, the ductility of the alloy of the present invention is greatly improved, and it can resist alkali, sulfuric acid, hydrochloric acid, dilute nitric acid and Wang at standard temperature and pressure. Water, through the action of adding a small amount of molybdenum, causes a large distortion of the crystal lattice after solid solution, significantly strengthens the alloy matrix, improves the high-temperature strength and red hardness of the matrix, can cut off and reduce the network structure in the coating, and improves cavitation resistance , Erosion ability.

A method for preparing a nickel-based superalloy rod, comprising the following steps:

(1) Prepare the alloy according to the ratio of the above elements, and then smelt it in a vacuum induction furnace. The melting temperature is controlled during the smelting process: 1510°C to 1570°C. The steel is tapped at the end of the smelting stage, and the solution is cast into an alloy electrode;

(2) Carry out electroslag remelting to the alloy electrode obtained in step (1), and remelt into electroslag ingot; electroslag remelting adopts pre-melted slag, and the slag system and proportion are CaF2:Al2O3:CaO:TiO2:MgO =65:11:11:2.5:4;

(3) Carrying out vacuum consumable remelting to the electroslag ingot obtained in step (2) to obtain consumable ingot, when remelting under vacuum consumable, control melting speed to be 3.2～4.5Kg/min;

(4) performing high-temperature diffusion homogenization annealing on the consumable ingot obtained in step (3) in the range of 1100° C. to 1300° C. to obtain a homogenization annealed ingot;

(5) Heating the homogenized annealed ingot obtained in step (4) to 1100° C. to 1260° C., keeping it warm for 3 hours, and forging it into the required bar on a fast forging machine. The forging pressure of the fast forging machine is 4300t;

(6) Perform flaw detection on the bar obtained in step (5), and perform grinding on the surface to remove defects.

The present invention has been described by the above-mentioned related embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention all belong to the scope of patent protection of the present invention.

Claims (6)

1. The nickel-based superalloy bar is characterized by comprising the following components in percentage by weight: 0.04-0.08% of C, 0.05-0.35% of Mn, 0.001-0.008% of S, 10-25% of Cr, 0.7-0.14% of B, 2-5% of Mo, 0.3-0.8% of Cu, 0.05-0.2% of Nb, 0.04-0.1% of Ta0.3-0.6% of in, 0.001-0.005% of Re, and the balance of Ni.

2. The nickel-base superalloy rod according to claim 1, wherein the nickel-base superalloy rod comprises the following components in weight percent: 0.04% of C, 0.05% of Mn, 0.001% of S, 10% of Cr, 0.7% of B, 2% of Mo, 0.3% of Cu, 0.05% of Nb, 0.04% of Ta0.04% of In, 0.001% of Re, and the balance of Ni.

3. The nickel-base superalloy rod according to claim 1, wherein the nickel-base superalloy rod comprises the following components in weight percent: 0.08% of C, 0.35% of Mn, 0.008% of S, 25% of Cr, 0.14% of B, 5% of Mo, 0.8% of Cu, 0.2% of Nb, 0.1% of Ta0.1% of In, 0.005% of Re, and the balance of Ni.

4. The nickel-base superalloy rod according to claim 1, wherein the nickel-base superalloy rod comprises the following components in weight percent: 0.06% of C, 0.12% of Mn, 0.005% of S, 23% of Cr, 0.9% of B, 4% of Mo, 0.7% of Cu, 0.09% of Nb, 0.06% of Ta0.06% of In0.4% of Re, 0.003% of Re, and the balance of Ni.

5. The preparation method of the nickel-based superalloy bar is characterized by comprising the following steps of:

(1) Preparing alloy according to the element proportion, smelting in a vacuum induction furnace, and controlling the total smelting temperature in the smelting process: tapping at 1510-1570 ℃ in the final smelting stage, and pouring the solution into an alloy electrode;

(2) Carrying out electroslag remelting on the alloy electrode obtained in the step (1), and remelting into an electroslag ingot; the electroslag remelting adopts premelting slag, wherein the slag system and the proportion are CaF2, al2O3, caO, tiO2, mgO=65:11:11:2.5:4;

(3) Carrying out vacuum consumable remelting on the electroslag ingot obtained in the step (2) to obtain a consumable ingot, wherein the melting speed is controlled to be 3.2-4.5 Kg/min during vacuum consumable remelting;

(4) Carrying out high-temperature diffusion homogenizing annealing on the consumable ingot obtained in the step (3) at 1100-1300 ℃ to obtain a homogenizing annealed ingot;

(5) Heating the homogenized annealing ingot obtained in the step (4) to 1100-1260 ℃, preserving heat for 3h, and forging into a required bar on a rapid forging machine;

(6) And (3) carrying out flaw detection on the bar obtained in the step (5), and carrying out coping on the surface to remove the flaw.

6. The method for producing a nickel-base superalloy rod according to claim 5, wherein the forging pressure of the rapid forging machine is 4000 to 6000t.