Ods nickel-based superalloy and its preparation method and application

Abstract

The application relates to the technical field of metal materials, and provides an ODS nickel-based high-temperature alloy and a preparation method and application thereof. The ODS nickel-based high-temperature alloy comprises a nickel-based alloy and Y2O3 nano-particles dispersed in the nickel-based alloy, and the ODS nickel-based high-temperature alloy is prepared through a hot isostatic pressing sintering process. The ODS nickel-based high-temperature alloy powder is prepared through the hot isostatic pressing sintering process, is sintered into a shape at the same time of hot isostatic pressing, the dispersion strengthening effect of the Y2O3 nano-particles in the ODS nickel-based high-temperature alloy is better, the alloying degree of the ODS nickel-based high-temperature alloy is higher, the density is higher, the grain is small, the structure is uniform, the ODS nickel-based high-temperature alloy has good high-temperature comprehensive performance, and can be applied to the fields of aerospace, petrochemical industry and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal materials, in particular to an ODS nickel-based superalloy and a preparation method and application thereof. BACKGROUND

[0002] High-temperature alloy refers to a kind of metal material taking iron, nickel and cobalt as base and capable of working at high temperature above 600 DEG C and under certain stress for a long time, and has high high-temperature strength, good oxidation resistance and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive performance, and is an important material widely used in aviation, aerospace, petroleum, chemical industry and ship.

[0003] As a kind of high-temperature alloy, oxide dispersion-strengthened (ODS) alloy mainly includes ODS iron-based alloy and ODS nickel-based superalloy. The working temperature of ODS iron-based alloy can only reach 700 DEG C, while ODS nickel-based superalloy still has excellent high-temperature creep performance, fatigue performance and oxidation resistance above 1000 DEG C, and can be used as guide vane or turbine blade in turbojet engine.

[0004] Traditional ODS nickel-based superalloy is usually sintered by alloy powder in a state of vacuum or inert gas protection by pressure casting. However, a small amount of pores and defects in the traditional sintered ODS nickel-based superalloy are difficult to eliminate, which greatly affects the product performance of ODS nickel-based superalloy. SUMMARY

[0005] Therefore, it is necessary to provide an ODS nickel-based superalloy with high density, few defects and good comprehensive performance, and a preparation method and application thereof.

[0006] In one aspect of the present application, an ODS nickel-based superalloy is provided, which includes a nickel-based alloy and Y2O3 nanoparticles dispersed in the nickel-based alloy, and the ODS nickel-based superalloy is prepared by hot isostatic pressing sintering process.

[0007] In some embodiments, the mass percentage of the Y2O3 nanoparticles relative to the nickel-based alloy is 0.2% to 0.6%.

[0008] In some embodiments, the nickel-based alloy includes the following elements according to mass percentage:

[0009]

[0010] In some embodiments, the ODS nickel-based superalloy is prepared by hot isostatic pressing sintering process of nickel-based alloy powder and the Y2O3 nanoparticles, and the particle size of the nickel-based alloy powder is 30-60 μm.

[0011] In some embodiments, the particle size of the Y2O3 nanoparticles is 10-30 nm.

[0012] In some embodiments, the density of the ODS nickel-based superalloy is 99-99.7%.

[0013] In some embodiments, the tensile strength of the ODS nickel-based superalloy at room temperature is 700-850 MPa.

[0014] In some embodiments, the elongation of the ODS nickel-based superalloy at room temperature is 12.5-19%.

[0015] In some embodiments, the tensile strength of the ODS nickel-based superalloy at 600°C is 425-550 MPa.

[0016] In some embodiments, the elongation of the ODS nickel-based superalloy at 600°C is 8.0-13.5%.

[0017] Another aspect of the present application provides a preparation method of the ODS nickel-based superalloy.

[0018] The nickel-based alloy powder and the Y2O3 nanoparticles are loaded into a mold for hot isostatic pressing sintering.

[0019] Another aspect of the present application provides an application of the ODS nickel-based superalloy in preparation of aerospace equipment, petrochemical equipment or engine.

[0020] Another aspect of the present application provides an ODS nickel-based superalloy product comprising the ODS nickel-based superalloy.

[0021] The ODS nickel-based superalloy comprises nickel-based alloy and Y2O3 nanoparticles dispersed in the nickel-based alloy, and is prepared by hot isostatic pressing sintering process, and is sintered and formed simultaneously in hot isostatic pressing. The Y2O3 nanoparticles in the ODS nickel-based superalloy have good dispersion strengthening effect as dispersion phase, and the ODS nickel-based superalloy has high alloying degree, high density, small grain size and uniform structure, and has good high-temperature comprehensive performance. DETAILED DESCRIPTION

[0022] For the purposes of the present invention, a more complete description of which will follow, the present invention can be realized in many different forms. Indeed, the embodiments presented herein are by way of example only and are not intended to limit the scope of the invention. Rather, these embodiments provide a concrete basis for inferring the scope of the present invention.

[0023] Unless otherwise defined, 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 herein is for 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.

[0024] An embodiment of the present invention provides an ODS nickel-based superalloy, the ODS nickel-based superalloy comprising a nickel-based alloy and Y2O3 nanoparticles dispersed in the nickel-based alloy, the ODS nickel-based superalloy being prepared by a hot isostatic pressing sintering process. The Y2O3 nanoparticles are uniformly distributed in the nickel-based alloy in a dispersed phase. The ODS nickel-based superalloy described above comprises a nickel-based alloy and Y2O3 nanoparticles dispersed in the nickel-based alloy, and is prepared by a hot isostatic pressing sintering process. The ODS nickel-based superalloy is sintered and formed simultaneously in the hot isostatic pressing process. The ODS nickel-based superalloy has a good dispersion strengthening effect of Y2O3 nanoparticles, a high degree of alloying, a high density, fine grains, a uniform structure, and good high-temperature comprehensive performance.

[0025] In some embodiments, the mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.2% to 0.6%. When the content of Y2O3 nanoparticles is within the range described above, the ODS nickel-based superalloy has good high-temperature creep performance and high-temperature oxidation resistance. Further, the mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.2% to 0.4% or 0.4% to 0.6%. Alternatively, the mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.2%, 0.3%, 0.4%, 0.5%, or 0.6%.

[0026] In some embodiments, the nickel-based alloy comprises the following elements in terms of mass percentage:

[0027]

[0028] It should be noted that the nickel-based alloy generally also contains a small amount of unavoidable impurity elements, such as silicon (Si), oxygen (O), and the like. Generally, in the nickel-based alloy described above, the mass percentage of silicon is not more than 0.05%, and the mass percentage of oxygen is not more than 0.01%.

[0029] Compared with the conventional nickel-based superalloy, the nickel-based alloy has good elongation and tensile strength, and can improve the high-temperature oxidation resistance of the ODS nickel-based superalloy, by adding 0.2% to 0.6% of zirconium in mass percentage and reasonably matching other alloying elements.

[0030] Further, the nickel-based alloy comprises the following elements in mass percentage:

[0031]

[0032] In some embodiments, the ODS nickel-based superalloy is prepared by a hot isostatic pressing sintering process of the nickel-based alloy powder and Y2O3 nanoparticles, and the particle size of the nickel-based alloy powder is 30 μm to 60 μm. Optionally, the particle size of the nickel-based alloy powder is 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm or 60 μm.

[0033] In some embodiments, the particle size of the Y2O3 nanoparticles is 10 nm to 30 nm. The Y2O3 nanoparticles with the above particle size range can form a relatively stable oxide dispersion phase uniformly dispersed in the alloy matrix at high temperature (above 600°C), thereby achieving a good strengthening effect. Optionally, the particle size of the Y2O3 nanoparticles is 10 nm, 15 nm, 20 nm, 25 nm or 30 nm.

[0034] The ODS nickel-based superalloy is prepared by a hot isostatic pressing sintering process, and is sintered and formed while being densified by hot isostatic pressing, so that the alloy has fewer internal pores and defects and has a high density. In some embodiments, the density of the ODS nickel-based superalloy is 99% to 99.7%.

[0035] The ODS nickel-based superalloy has good oxide dispersion strengthening effect, fewer internal defects and good mechanical properties. In some embodiments, the tensile strength of the ODS nickel-based superalloy at room temperature is 700 MPa to 850 MPa.

[0036] In addition, the ODS nickel-based superalloy has good elongation, which is beneficial to the processing and application of the ODS nickel-based superalloy. In some embodiments, the elongation of the ODS nickel-based superalloy at room temperature is 12.5% to 19%.

[0037] It can be understood that the room temperature in the present application specifically refers to a range of 20°C to 40°C.

[0038] In some embodiments, the tensile strength of the ODS nickel-based superalloy at 600°C is 425 MPa to 550 MPa.

[0039] In some embodiments, the ODS nickel-based superalloy has an elongation of 8.0% to 13.5% at 600℃.

[0040] The present application further provides a method for preparing the ODS nickel-based superalloy, comprising the following steps:

[0041] The nickel-based alloy powder and Y2O3 nanoparticles are filled in a mold for hot isostatic pressing sintering.

[0042] In some embodiments, the vacuum degree in the mold is 10 2 Pa to 10 3 Pa.

[0043] In some embodiments, in order to improve the density of the ODS nickel-based superalloy, the step of filling the nickel-based alloy powder and Y2O3 nanoparticles in the mold further comprises a vibration treatment, so that the tap density of the nickel-based alloy and Y2O3 nanoparticles in the mold is more than 70% of the theoretical density.

[0044] In some embodiments, the method for preparing the nickel-based alloy powder comprises the following steps:

[0045] The nickel-based alloy raw material is prepared into the nickel-based alloy powder through induction melting gas atomization. The nickel-based alloy powder prepared through induction melting gas atomization has accurate composition and good fluidity, and is convenient for subsequent preparation of the ODS nickel-based superalloy.

[0046] In some embodiments, the induction melting gas atomization treatment is performed in an induction melting gas atomization powder preparation device. Specifically, the nickel-based alloy raw material is heated and rotated in the induction melting gas atomization powder preparation device, melted into liquid and dropped into an atomizer; the alloy main material liquid is dispersed into fine droplets under the impact of inert gas, and then solidified into spherical powder in the atomizer.

[0047] In some embodiments, the nickel-based alloy raw material comprises the following elements according to mass percentage:

[0048]

[0049] In some embodiments, the flow rate of the inert gas in the induction melting gas atomization powder preparation device is 500m 3 / s to 800m 3 / s. Further, the flow rate of the inert gas in the induction melting gas atomization powder preparation device is 600m 3 / s

[0050] In some embodiments, the particle size of the nickel-based alloy powder prepared through induction melting gas atomization is 30μm to 60μm.

[0051] In some embodiments, before the step of loading the nickel-based alloy powder and the Y2O3 nanoparticles into the mold, the method further comprises a step of mechanically alloying the nickel-based alloy powder and the Y2O3 nanoparticles.

[0052] Specifically, the mechanical alloying treatment is high-energy planetary ball milling of the nickel-based alloy powder and the Y2O3 nanoparticles. The mechanical alloying of the nickel-based alloy powder and the Y2O3 nanoparticles by high-energy planetary ball milling can uniformly disperse the Y2O3 nanoparticles in the nickel-based alloy powder, which is conducive to the subsequent preparation of the ODS nickel-based high-temperature alloy with good dispersion strengthening effect.

[0053] Specifically, the rotation speed of the high-energy planetary ball mill is 400 r / min to 600 r / min. Alternatively, the rotation speed of the high-energy planetary ball mill is 400 r / min, 450 r / min, 500 r / min, 550 r / min, or 600 r / min.

[0054] In some embodiments, the mass percentage of the Y2O3 nanoparticles relative to the nickel-based alloy powder is 0.2% to 0.6%.

[0055] In some embodiments, before the step of loading the nickel-based alloy powder and the Y2O3 nanoparticles into the mold, the method further comprises a step of drying the mechanically alloyed nickel-based alloy powder and the Y2O3 nanoparticles.

[0056] Specifically, the step of drying is to heat the nickel-based alloy powder and the Y2O3 nanoparticles at 150°C to 200°C for 2h to 4h under vacuum or inert gas protection. Alternatively, the drying temperature is 150°C, 160°C, 170°C, 180°C, 190°C, or 200°C. The drying time is 2h, 2.5h, 3h, 3.5h, or 4h.

[0057] In some embodiments, in the step of hot isostatic pressing and sintering, the pressure is 80 MPa to 180 MPa. The step of hot isostatic pressing and sintering within the above pressure range can make the nickel-based high-temperature alloy have a higher density. When the pressure is lower than 80 MPa, the density of the alloy body decreases; and when the pressure exceeds 180 MPa, the alloy body is prone to cracking; therefore, too high or too low pressure will affect the overall mechanical properties of the alloy body.

[0058] Alternatively, in the step of hot isostatic pressing and sintering, the pressure is 80 MPa, 90 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, or 180 MPa.

[0059] In some embodiments, the hot isostatic sintering is performed at a temperature of 1100-1400℃. Further, the hot isostatic sintering is performed at a temperature of 1250-1400℃. Alternatively, the hot isostatic sintering is performed at a temperature of 1100℃, 1150℃, 1200℃, 1250℃, 1300℃, 1350℃ or 1400℃.

[0060] In some embodiments, the hot isostatic sintering is performed for a time of 2.5-4h. Alternatively, the hot isostatic sintering is performed for a time of 2.5h, 3h, 3.5h or 4h.

[0061] The ODS nickel-based superalloy prepared according to the above method has a good dispersion strengthening effect, a high degree of alloying, a high density, fine grains and a uniform structure, and has a good high-temperature comprehensive performance.

[0062] In another embodiment of the present application, the above ODS nickel-based superalloy is used in the preparation of aerospace equipment, petrochemical equipment or engines.

[0063] In another embodiment of the present application, an ODS nickel-based superalloy product is provided, which comprises the above ODS nickel-based superalloy.

[0064] In some embodiments, the ODS nickel-based superalloy product is made of the above ODS nickel-based superalloy, or the ODS nickel-based superalloy is contained in the material of the ODS nickel-based superalloy product.

[0065] In some embodiments, the surface or part of the ODS nickel-based superalloy product comprises the above ODS nickel-based superalloy.

[0066] The ODS nickel-based superalloy and the preparation method thereof will be further described below through specific embodiments.

[0067] Embodiment 1:

[0068] The ODS nickel-based superalloy of the present embodiment comprises a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6% and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3 nanoparticles is 20nm.

[0069] The ODS nickel-based superalloy of the present embodiment is prepared by the following steps:

[0070] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, and is impacted into fine liquid droplets by inert gas, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0071] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled, the rotation speed of the ball mill is 500 r / min, and the ball milling time is 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0072] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and a vibration treatment is performed during the loading process to make the powder have a tap density of 70% of the theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the jacket 10 3 Pa.

[0073] (4) Hot isostatic pressing sintering: the jacket filled with the ODS nickel-based alloy powder is subjected to a pressure of 80 MPa, and is sintered at 1100°C for 4 h.

[0074] Example 2:

[0075] The ODS nickel-based superalloy of this example includes a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy includes the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3 nanoparticles is 20 nm.

[0076] The ODS nickel-based superalloy of this example is prepared by the following steps:

[0077] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, and is impacted into fine liquid droplets by inert gas, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0078] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled, the rotation speed of the ball mill is 500 r / min, and the ball milling time is 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0079] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and a vibration treatment is performed during the loading process to make the powder have a tap density of 70% of the theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the jacket 103 Pa.

[0080] (4) Hot isostatic pressing sintering: the capsule filled with ODS nickel-based alloy powder is subjected to a pressure of 100 MPa, and sintered at 1100°C for 4h.

[0081] Example 3:

[0082] The ODS nickel-based superalloy of this example comprises a nickel-based alloy and Y2O3nanoparticles. The nickel-based alloy comprises the following elements by mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3nanoparticles is 20 nm.

[0083] The ODS nickel-based superalloy of this example is prepared by the following steps:

[0084] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then impacted into fine droplets by inert gas after falling into an atomizer, and then solidified into spherical powder in the atomizer. The particle size of the prepared nickel-based alloy powder is 50 μm.

[0085] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3nanoparticles are high-energy planetary ball milled, the rotation speed of the ball mill is 500 r / min, and the ball milling time is 4h. The particle size of the prepared ODS nickel-based alloy powder is 50 μm.

[0086] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal capsule, and vibration treatment is performed during loading to make the powder vibration density reach 70% of its theoretical density; after the powder fills the capsule, the capsule is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the capsule 10 3 Pa.

[0087] (4) Hot isostatic pressing sintering: the capsule filled with ODS nickel-based alloy powder is subjected to a pressure of 150 MPa, and sintered at 1100°C for 4h.

[0088] Example 4:

[0089] The ODS nickel-based superalloy of this example comprises a nickel-based alloy and Y2O3nanoparticles. The nickel-based alloy comprises the following elements by mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3nanoparticles is 20 nm.

[0090] The ODS nickel-based superalloy of this example is prepared by the following steps:

[0091] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, and is impacted into fine liquid droplets by inert gas, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0092] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled, the rotation speed of the ball mill is 500 r / min, and the ball milling time is 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0093] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal sheath, and vibration treatment is performed during loading to make the powder vibration density reach 70% of its theoretical density; after the powder fills the sheath, the sheath is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the sheath 10 3 Pa.

[0094] (4) Hot isostatic pressing sintering: the sheath filled with the ODS nickel-based alloy powder is subjected to a pressure of 180 MPa and sintered at 1100°C for 4 h.

[0095] Example 5:

[0096] The ODS nickel-based superalloy of this embodiment includes a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy includes the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3 nanoparticles is 20 nm.

[0097] The ODS nickel-based superalloy of this embodiment is prepared by the following steps:

[0098] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, and is impacted into fine liquid droplets by inert gas, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0099] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled, the rotation speed of the ball mill is 500 r / min, and the ball milling time is 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0100] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and the powder is vibrated during loading to achieve a tap density of 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed and vacuumed and dehumidified to achieve a vacuum of 10 3 Pa.

[0101] (4) Hot isostatic pressing sintering: the jacket filled with the ODS nickel-based alloy powder is subjected to a pressure of 100 MPa and sintered at 1300°C for 4h.

[0102] Example 6:

[0103] The ODS nickel-based superalloy of this example includes a nickel-based alloy and Y2O3nanoparticles. The nickel-based alloy includes the following elements in mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of the Y2O3nanoparticles is 20 nm.

[0104] The ODS nickel-based superalloy of this example is prepared by the following steps:

[0105] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into a liquid, and dropped into an atomizer, where it is impacted by inert gas into fine droplets, and then solidified into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0106] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3nanoparticles are high-energy planetary ball milled at a speed of 500 r / min for 4h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0107] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and the powder is vibrated during loading to achieve a tap density of 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed and vacuumed and dehumidified to achieve a vacuum of 10 3 Pa.

[0108] (4) Hot isostatic pressing sintering: the jacket filled with the ODS nickel-based alloy powder is subjected to a pressure of 100 MPa and sintered at 1300°C for 4h.

[0109] Example 7:

[0110] The ODS nickel-based superalloy of this embodiment comprises a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of Y2O3 nanoparticles is 20 nm.

[0111] The ODS nickel-based superalloy of this embodiment is prepared by the following steps:

[0112] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, where it is impacted by inert gas into fine droplets, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0113] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled at a speed of 500 r / min for 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0114] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and vibration treatment is performed during loading to make the powder have a tap density of 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the jacket 10 3 Pa.

[0115] (4) Hot isostatic pressing sintering: the jacket filled with ODS nickel-based alloy powder is subjected to a pressure of 100 MPa and sintered at 1000°C for 4 h.

[0116] Example 8:

[0117] The ODS nickel-based superalloy of this embodiment comprises a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of Y2O3 nanoparticles is 20 nm.

[0118] The ODS nickel-based superalloy of this embodiment is prepared by the following steps:

[0119] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, where it is impacted by inert gas into fine droplets, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0120] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball-milled at a speed of 500 r / min for 4 h. The particle size of the prepared ODS nickel-based alloy powder is 50 μm.

[0121] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket. During the loading process, vibration treatment is performed to make the powder reach 70% of the theoretical density. After the powder fills the jacket, the jacket is sealed and vacuumed and dehumidified to make the vacuum degree in the jacket 10 Pa. 3 Pa.

[0122] (4) Hot isostatic pressing sintering: the jacket filled with the ODS nickel-based alloy powder is subjected to a pressure of 250 MPa and sintered at 1400°C for 4 h.

[0123] Example 9:

[0124] The ODS nickel-based superalloy of the present example comprises a nickel-based alloy and Y2O3 nanoparticles. The alloy main material comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, carbon 0.05%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.6%. The particle size of the Y2O3 nanoparticles is 20 nm.

[0125] The ODS nickel-based superalloy of the present example is prepared by the following steps:

[0126] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then impacted into fine droplets by inert gas after falling into an atomizer, and then solidified into spherical powder in the atomizer. The particle size of the prepared alloy main material powder is 50 μm.

[0127] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball-milled at a speed of 500 r / min for 4 h. The particle size of the prepared ODS nickel-based alloy powder is 50 μm.

[0128] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket. During the loading process, vibration treatment is performed to make the powder reach 70% of the theoretical density. After the powder fills the jacket, the jacket is sealed and vacuumed and dehumidified to make the vacuum degree in the jacket 10 Pa.

[0129] (4) Hot isostatic pressing sintering: the jacket filled with the ODS nickel-based alloy powder is subjected to a pressure of 100 MPa and sintered at 1000°C for 4 h.

[0130] Example 10:

[0131] The ODS nickel-based superalloy of the present example comprises a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of Y2O3 nanoparticles is 20 nm.

[0132] The ODS nickel-based superalloy of the present example is prepared by the following steps:

[0133] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, where it is impacted by inert gas into fine droplets, and then solidifies into spherical powder in the atomizer. The particle size of the prepared nickel-based alloy powder is 50 μm.

[0134] (2) Mechanical alloying: the nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled at a speed of 500 r / min for 4 h. The particle size of the prepared ODS nickel-based alloy powder is 50 μm.

[0135] (3) The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and vibration treatment is performed during loading to make the powder vibration density reach 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed and vacuumized and dehumidified to make the vacuum degree in the jacket 10 3 Pa.

[0136] (4) Hot isostatic pressing sintering: the jacket filled with ODS nickel-based alloy powder is subjected to a pressure of 140 MPa and sintered at 1300°C for 4 h.

[0137] Comparative Example 1:

[0138] This comparative example is compared with Example 2, and the components are the same, except that a die-casting forming sintering process is used for preparation.

[0139] The ODS nickel-based superalloy of the present example comprises a nickel-based alloy and Y2O3 nanoparticles. The nickel-based alloy comprises the following elements in terms of mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel. The mass percentage of Y2O3 nanoparticles relative to the nickel-based alloy is 0.3%. The particle size of Y2O3 nanoparticles is 20 nm.

[0140] The ODS nickel-based superalloy of the present example is prepared by the following steps:

[0141] (1) Induction melting gas atomization: The nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then dropped into an atomizer, where it is impacted by inert gas into fine droplets, and then solidified into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0142] (2) Mechanical alloying: The nickel-based alloy powder and Y2O3 nanoparticles are high-energy planetary ball milled at a speed of 500 r / min for 4 h. The prepared ODS nickel-based alloy powder has a particle size of 50 μm.

[0143] (3) Die casting: The ODS nickel-based alloy powder of step (2) is loaded into a stainless steel metal jacket, and then pressed at a pressure of 150 MPa for 30 min, and then demolded.

[0144] (4) Sintering: The alloy body of step (3) is sintered at 1200°C in a hydrogen atmosphere for 4 h.

[0145] Comparative Example 2:

[0146] The ODS nickel-based superalloy of this comparative example is a commercially available MA754 alloy (Shanghai Xinyi Incoloy MA754).

[0147] Comparative Example 3:

[0148] The nickel-based superalloy of this comparative example includes the following elements in mass percentage: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel.

[0149] The nickel-based superalloy of this comparative example is prepared by the following steps:

[0150] (1) Induction melting gas atomization: The nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then dropped into an atomizer, where it is impacted by inert gas into fine droplets, and then solidified into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0151] (2) The nickel-based alloy powder is loaded into a stainless steel metal jacket, and the powder is vibrated during the loading process to achieve a tap density of 70% of the theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to achieve a vacuum degree of 10 3 Pa in the jacket.

[0152] (3) Hot isostatic pressing sintering: The jacket filled with nickel-based alloy powder is subjected to a pressure of 80 MPa at 1100°C for 4 h.

[0153] Comparative Example 4:

[0154] The nickel-based superalloy of the present comparative example comprises the following elements in mass percent: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel.

[0155] The nickel-based superalloy of the present comparative example is prepared by the following steps:

[0156] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, where it is impacted by inert gas into fine droplets, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0157] (2) The nickel-based alloy powder is loaded into a stainless steel metal jacket, and vibration treatment is performed during the loading process to make the powder vibration density reach 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the jacket 10 3 Pa.

[0158] (3) Hot isostatic pressing sintering: a pressure of 100 MPa is applied to the jacket filled with nickel-based alloy powder, and sintering is performed at 1100°C for 4h.

[0159] Comparative Example 5:

[0160] The nickel-based superalloy of the present comparative example comprises the following elements in mass percent: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel.

[0161] The nickel-based superalloy of the present comparative example is prepared by the following steps:

[0162] (1) Induction melting gas atomization: the nickel-based alloy raw material is rotated and heated in a high-frequency inductor, melted into liquid, and then falls into an atomizer, where it is impacted by inert gas into fine droplets, and then solidifies into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0163] (2) The nickel-based alloy powder is loaded into a stainless steel metal jacket, and vibration treatment is performed during the loading process to make the powder vibration density reach 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed, and vacuum pumping and dehumidification are performed to make the vacuum degree in the jacket 10 3 Pa.

[0164] (3) Hot isostatic pressing sintering: a pressure of 100 MPa is applied to the jacket filled with nickel-based alloy powder, and sintering is performed at 1300°C for 4h.

[0165] Comparative Example 6:

[0166] The nickel-based superalloy of the present comparative example comprises the following elements in mass percent: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and the balance of nickel.

[0167] The nickel-based superalloy of the present comparative example is prepared by the following steps:

[0168] (1) Induction melting gas atomization: the raw material of the nickel-based alloy is rotated and heated in a high-frequency inductor, melted into liquid, and dropped into an atomizer, where it is impacted by inert gas into fine droplets, and then solidified into spherical powder in the atomizer. The prepared nickel-based alloy powder has a particle size of 50 μm.

[0169] (2) The nickel-based alloy powder is loaded into a stainless steel metal jacket, and vibration treatment is performed during loading to make the powder vibration density reach 70% of its theoretical density; after the powder fills the jacket, the jacket is sealed and vacuumized and dehumidified to make the vacuum degree in the jacket 10 3 Pa.

[0170] (3) Hot isostatic pressing sintering: the jacket filled with the nickel-based alloy powder is subjected to a pressure of 140 MPa and sintered at 1300°C for 4h.

[0171] Further, the density, tensile strength and elongation at room temperature or high temperature of the superalloys of Examples 1-10 and Comparative Examples 1-6 above are measured, and the test results are recorded in Table 1.

[0172] Specifically, the density is measured by Archimedes drainage method. Tensile strength and elongation: room temperature (25°C) and (600°C) tensile property tests are performed on a tensile testing machine, and the sample is a standard rod-shaped tensile sample according to the national standard, model M8xΦ4, wherein the diameter of the middle part is 4 mm.

[0173] Table 1

[0174]

[0175]

[0176] As can be seen from the data in Table 1, the ODS nickel-based superalloys prepared in Examples 1-10 have high density, ranging from 99% to 99.7%, and have good mechanical properties at room temperature or high temperature. The tensile strength at room temperature is 700-850 MPa, and the elongation is 12.5%-19%. The tensile strength at high temperature (600°C) is 425-550 MPa, and the elongation is 8.8%-13.5%. The ODS nickel-based superalloys prepared in Examples 1-6 and 10 have high density and good comprehensive properties at room temperature and high temperature, because they are subjected to hot isostatic pressing sintering at 80-180 MPa and 1100-1400°C. The ODS nickel-based superalloy prepared in Example 8 is subjected to hot isostatic pressing sintering at 250 MPa, and has comparable density to the ODS nickel-based superalloy prepared in Example 6, but the applied pressure is higher, and the mechanical properties of the alloy at room temperature and high temperature are decreased. The ODS nickel-based superalloy prepared in Example 9 does not contain zirconium, and has lower density, mechanical properties at room temperature and high temperature than the ODS nickel-based superalloy prepared in Example 2.

[0177] The ODS nickel-based superalloy in Comparative Example 1 is prepared by traditional die casting sintering technology, and has low density and poor mechanical properties at room temperature and high temperature. The MA754 alloy in Comparative Example 2 is commercially available, and has lower density and comprehensive mechanical properties than the ODS nickel-based superalloys prepared in Examples 1-10.

[0178] The ordinary nickel-based alloys in Comparative Examples 3-6 do not contain Y2O3dispersion phase, and have lower density and significantly decreased mechanical properties at room temperature and high temperature than the ODS nickel-based superalloys in Examples 1, 2, 5 and 10.

[0179] The technical features of the above-described examples can be combined in any manner. To make the description brief, not all possible combinations of the technical features in the above-described examples are described, but as long as the combinations of the technical features do not contradict each other, they should be considered as falling within the scope of the present disclosure.

[0180] The above-mentioned embodiments only express several implementation manners of the present application, facilitate concrete and detailed understanding of the technical solutions of the present application, but cannot be understood as a limitation on the patent protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. It should be understood that, on the basis of the technical solutions provided by the present application, the technical solutions obtained by logical analysis, reasoning or limited experiments by the skilled person in the art all belong to the protection scope of the appended claims of the present application. Therefore, the protection scope of the present application patent should be subject to the content of the appended claims, and the description can be used to explain the content of the claims.

Claims

1. An ODS nickel-base superalloy characterized in that, The ODS nickel-based superalloy comprises a nickel-based alloy and Y2O3 nanoparticles dispersed in the nickel-based alloy, and is prepared by a hot isostatic pressing sintering process; The nickel-based alloy comprises the following elements in percentage by mass: chromium 20%, iron 1.0%, aluminum 0.3%, titanium 0.5%, zirconium 0.6%, and nickel balance; the temperature of the hot isostatic pressing sintering is 1100-1150℃, and the pressure is 160-180MPa; the Y2O3 nanoparticles are in a percentage of 0.2-0.6% by mass based on the total mass of the nickel-based alloy and the Y2O3 nanoparticles.

2. The ODS nickel-base superalloy of claim 1, wherein, The ODS nickel-based superalloy is prepared by a hot isostatic pressing sintering process of a nickel-based alloy powder and the Y2O3 nanoparticles, and the particle size of the nickel-based alloy powder is 30-60μm.

3. The ODS nickel-base superalloy of claim 1, wherein, The particle size of the Y2O3 nanoparticles is 10-30nm.

4. The method of producing an ODS nickel-based superalloy according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: filling the nickel-based alloy powder and the Y2O3 nanoparticles in a mold and performing hot isostatic pressing sintering.

5. Use of the ODS nickel-based superalloy according to any one of claims 1-3 in the preparation of aerospace equipment or petrochemical equipment.

6. Use of the ODS nickel-based superalloy according to any one of claims 1-3 in the preparation of an engine.

7. An ODS nickel-base superalloy article, characterized in that, The engine comprises the ODS nickel-based superalloy according to any one of claims 1-3.

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