Corrosion and impact resistant alloy material and processing thereof

Abstract

The application relates to the technical field of alloy materials, in particular to a corrosion-resistant and impact-resistant alloy material and a processing technology thereof. The Y-La-Ce ternary rare earth is used for synergistic modification, alloy bath deep deoxidization and desulfurization and high-efficiency purification of grain boundary impurities are realized, and the segregation of harmful elements such as S, P and O at the grain boundary is significantly reduced. The application also adopts a whole-process process synergistic regulation and control of high-temperature rolling, grading aging and low-temperature stress relief. The high-temperature rolling can crush the as-cast dendrite, eliminate the loose shrinkage and realize the densification of the structure. The grading aging can accurately control the size and distribution of the nano precipitated phase, balance the strength and toughness and stabilize the grain boundary structure. The low-temperature stress relief annealing can completely release the residual stress generated in the rolling and aging processes, avoid the cracking in subsequent processing and service deformation, guarantee the size stability and structure uniformity of the material, has strong process compatibility, can be directly adapted to the existing metallurgical production line, realizes the stable mass production of large-size plates and bars, and is high in production efficiency and controllable in cost.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, specifically to a corrosion-resistant and impact-resistant alloy material and its processing technology. Background Technology

[0002] In extreme operating conditions such as marine engineering, chemical equipment, polar cryogenic equipment, engineering machinery, and mining machinery, materials face multiple service challenges, including high salt spray corrosion, strong mechanical impact, low-temperature brittle fracture, grain boundary corrosion, and fatigue failure. Traditional stainless steel, duplex stainless steel, high-nickel corrosion-resistant alloys, and ordinary rare-earth modified steel generally suffer from problems such as difficulty in balancing strength, toughness, and corrosion resistance, insufficient low-temperature toughness, incomplete grain boundary purification, severe grain coarsening, poor fatigue resistance, and limited dimensional specifications, making it difficult to meet the stringent requirements of high-end equipment for long-term stable service performance. Summary of the Invention

[0003] The purpose of this invention is to provide a corrosion-resistant and impact-resistant alloy material and its processing technology to solve the problem of insufficient performance of existing alloy materials in the face of external corrosion and mechanical impact.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a corrosion-resistant and impact-resistant alloy material, which, by weight percentage, comprises Ni 19.8~20.2wt%, Cr 14.3~15.2wt%, Mo 2.9~3.2wt%, Cu 1.8~2.1wt%, Y 0.65~0.75wt%, La 0.65~0.75wt%, Ce 0.2~0.4wt%, Ti 0.1~0.13wt%, Nb 0.08~0.1wt%, V 0.05~0.08wt%, with the balance being Fe and unavoidable impurities.

[0006] Secondly, the present invention also provides a processing method for a corrosion-resistant and impact-resistant alloy material, comprising the following steps:

[0007] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0008] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are placed into the melting furnace in order of melting point, heated and melted. Ti, Nb, and V are added, and after melting and homogenization, Y, La, and Ce are added. The furnace is heated and melted again. After refining and removing impurities, the metal is cast and naturally cooled under argon atmosphere to obtain a metal ingot.

[0009] S3. Homogenize the metal ingot at high temperature under an argon atmosphere, then cool it naturally to room temperature for later use;

[0010] S4. After grinding and cutting the homogenized ingot, it is subjected to high-temperature rolling. After rolling, it is air-cooled to room temperature for later use.

[0011] S5. The rolled part is subjected to aging strengthening treatment, cooled to room temperature in air, and the resulting material is processed into a machined blank, which is then heated and annealed.

[0012] S6. The annealed machined blank is subjected to surface treatment to obtain an alloy material with corrosion resistance and impact resistance.

[0013] Furthermore, in step S2, during the heating and melting process, the temperature is increased to 800-850℃ at a rate of 4-4.5℃ / min, held for 20-30 minutes, then increased again to 1450-1500℃ at a rate of 3-3.5℃ / min, held for 30-35 minutes, and then increased to 1575-1590℃ at a rate of 1.5-2℃ / min, held for 20-30 minutes.

[0014] Furthermore, in step S2, when Ti, Nb, and V are added, the temperature is cooled to 1520-1530℃ at a rate of 1-2℃ / min.

[0015] Furthermore, in step S2, when reheating and melting, the temperature is increased to 1550~1560℃ at a rate of 1.5~3℃ / min, and the mixture is stirred and melted for 25~35min.

[0016] Furthermore, in step S3, during the high-temperature homogenization treatment, the temperature is increased to 450-550℃ at a rate of 5-8℃ / min, held for 30-45min, then increased to 1150-1180℃ at a rate of 3-4℃ / min, held for 7.5-8.5h, and then decreased to 500-550℃ at a rate of 2-3℃ / min.

[0017] Furthermore, in step S4, during high-temperature rolling, the temperature is increased to 800-850℃ at a rate of 2-4℃ / min, held for 30-45min, then increased again to 1050-1100℃, held for 45-60min, and then rolled at a rolling rate of 0.8-1.2m / s, with a single-pass deformation of 10-15%, a total deformation of 75-80%, and a final rolling temperature of 850-880℃.

[0018] Furthermore, in step S5, during the aging strengthening treatment, the rolled part is heated to 400-420℃ at a rate of 2-2.5℃ / min under an argon atmosphere and held for 4.5-5.5h, then heated again to 630-650℃ and held for 3h, and then cooled to 300℃ at a rate of 1-1.5℃ / min.

[0019] Furthermore, in step S5, during the heating annealing, the machined blank is heated to 520~550℃, held at that temperature for 3 hours, and then cooled to room temperature at a rate of 3~4℃ / min to complete the annealing.

[0020] Furthermore, in step S6, the surface treatment is chromium diffusion.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] This invention achieves efficient purification of deep deoxidation and desulfurization of the alloy molten pool and grain boundary impurities through synergistic modification of Y-La-Ce ternary rare earth elements. It significantly reduces the segregation of harmful elements such as S, P, and O at the grain boundaries. Y and La act as grain refiners, effectively inhibiting grain growth and thus strengthening grain boundaries and mechanical properties. Ce provides a strong desulfurization and deoxidation effect, purifying grain boundaries, promoting element diffusion, stabilizing high-temperature microstructure, and significantly reducing grain boundary corrosion. The introduction of Ti, Nb, and V forms dispersed nanoscale carbonitrides during high-temperature homogenization and graded aging. These nanoparticles effectively pin grain boundaries, inhibit high-temperature grain coarsening, and significantly improve the thermal stability of the microstructure. Simultaneously, through precipitation strengthening, the strength, hardness, and fatigue resistance of the alloy are improved without sacrificing low-temperature toughness.

[0023] Furthermore, this invention employs a synergistic control of the entire process, including high-temperature rolling, graded aging, and low-temperature stress relief. High-temperature rolling can break up cast dendrites and eliminate porosity and shrinkage cavities, achieving a denser microstructure. Graded aging can precisely control the size and distribution of nano-precipitates, balancing strength and toughness and stabilizing the grain boundary structure. Low-temperature stress-relief annealing can completely release the residual stress generated during rolling and aging, preventing subsequent processing cracking and service deformation, ensuring the dimensional stability and microstructure uniformity of the material. It has strong process compatibility and can be directly adapted to existing metallurgical production lines, enabling stable mass production of large-size plates and bars with high production efficiency and controllable costs. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] In the embodiments and comparative examples of this invention, the chromizing treatment is performed as follows:

[0026] After grinding the surface of the metal material to remove the oxide layer, the vacuum was drawn, argon gas was introduced and the pressure was adjusted to 0.015 MPa. The metal material was then preheated to 500°C and sputtered using a Cr target at a sputtering current of 12 A and a sputtering thickness of 30 μm. After sputtering, the material was cooled to room temperature to complete the chromizing treatment.

[0027] In the embodiments and comparative examples of this invention, the proportion of alloy materials is expressed as a weight percentage.

[0028] Example 1

[0029] A processing method for a corrosion-resistant and impact-resistant alloy material includes the following steps:

[0030] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0031] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 800℃ at a rate of 4℃ / min and held for 30 min. Then, the temperature is raised to 1450℃ at a rate of 3℃ / min and held for 35 min. Next, the temperature is raised to 1575℃ at a rate of 1.5℃ / min and held for 30 min. The melting system is then cooled to 1520℃ at a rate of 2℃ / min. Ti, Nb, and V are added and melted evenly. Y, La, and Ce are added and the temperature is raised to 1550℃ again at a rate of 1.5℃ / min. The mixture is stirred and melted for 35 min. After refining and removing impurities, the mixture is cast and naturally cooled under argon atmosphere to obtain a metal ingot.

[0032] The metal ingot contains 19.84 wt% Ni, 14.31 wt% Cr, 2.93 wt% Mo, 1.81 wt% Cu, 0.66 wt% Y, 0.65 wt% La, 0.22 wt% Ce, 0.1 wt% Ti, 0.08 wt% Nb, and 0.06 wt% V, with the balance being Fe and unavoidable impurities.

[0033] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 450°C at a rate of 5°C / min and held for 45 min. Then, the temperature is increased to 1150°C at a rate of 3°C / min and held for 8.5 h. Finally, the temperature is decreased to 500°C at a rate of 2°C / min and allowed to cool naturally to room temperature for later use.

[0034] S4. After the homogenized ingot is ground and cut, it is subjected to high-temperature rolling. The temperature is raised to 800℃ at a rate of 2℃ / min, held for 45min, then raised to 1050℃ again, held for 60min, and then rolled at a rolling rate of 0.8m / s, with a single-pass deformation of 10% and a total deformation of 75%. The final rolling temperature is 850℃. After rolling, it is air-cooled to room temperature for later use.

[0035] S5. The rolled part is subjected to aging strengthening treatment. The rolled part is heated to 400℃ at a rate of 2℃ / min and held for 5h in an argon atmosphere. Then it is heated to 630℃ and held for 3h. Then it is cooled to 300℃ at a rate of 1℃ / min and air-cooled to room temperature. The resulting material is processed into a machined blank. The blank is then heated and annealed again. The machined blank is heated to 520℃ and held for 3h. Then it is cooled to room temperature at a rate of 3℃ / min to complete the annealing.

[0036] S6. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0037] Example 2

[0038] A processing method for a corrosion-resistant and impact-resistant alloy material includes the following steps:

[0039] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0040] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 850°C at a rate of 4.5°C / min and held for 20 min. Then, the temperature is raised to 1500°C at a rate of 3.5°C / min and held for 30 min. Then, the temperature is raised to 1590°C at a rate of 2°C / min and held for 20 min. The melting system is then cooled to 1530°C at a rate of 1.5°C / min. Ti, Nb, and V are added and melted evenly. Y, La, and Ce are added and the temperature is raised to 1560°C again at a rate of 2°C / min. The mixture is stirred and melted for 25 min. After refining and removing impurities, the mixture is cast and cooled naturally under argon atmosphere to obtain a metal ingot.

[0041] The metal ingot contains 20.01 wt% Ni, 14.86 wt% Cr, 3.04 wt% Mo, 1.96 wt% Cu, 0.71 wt% Y, 0.70 wt% La, 0.32 wt% Ce, 0.12 wt% Ti, 0.08 wt% Nb, and 0.07 wt% V, with the balance being Fe and unavoidable impurities.

[0042] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 550°C at a rate of 8°C / min and held for 30 min. Then, the temperature is increased to 1180°C at a rate of 4°C / min and held for 7.5 h. Finally, the temperature is decreased to 550°C at a rate of 3°C / min and allowed to cool naturally to room temperature for later use.

[0043] S4. After the homogenized ingot is ground and cut, it is subjected to high-temperature rolling. The temperature is raised to 850℃ at a rate of 3℃ / min, held for 30min, then raised to 1100℃ again, held for 45min, and then rolled at a rolling rate of 1m / s. The deformation per pass is 15%, the total deformation is 75%, and the final rolling temperature is 880℃. After rolling, it is air-cooled to room temperature and set aside for later use.

[0044] S5. The rolled part is subjected to aging strengthening treatment. The rolled part is heated to 420℃ at a rate of 2.5℃ / min and held for 4.5h in an argon atmosphere. Then it is heated to 650℃ and held for 3h. Then it is cooled to 300℃ at a rate of 1.5℃ / min and air-cooled to room temperature. The resulting material is processed into a machined blank. The blank is then heated and annealed again. The machined blank is heated to 550℃ and held for 3h. Then it is cooled to room temperature at a rate of 4℃ / min to complete the annealing.

[0045] S6. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0046] Example 3

[0047] A processing method for a corrosion-resistant and impact-resistant alloy material includes the following steps:

[0048] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0049] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 850°C at a rate of 4.5°C / min and held for 20 min. Then, the temperature is raised to 1500°C at a rate of 3.5°C / min and held for 30 min. Then, the temperature is raised to 1590°C at a rate of 2°C / min and held for 20 min. The melting system is then cooled to 1530°C at a rate of 1°C / min. Ti, Nb, and V are added and melted evenly. Y, La, and Ce are added and the temperature is raised to 1560°C again at a rate of 3°C / min. The mixture is stirred and melted for 25 min. After refining and removing impurities, the mixture is cast and cooled naturally under argon atmosphere to obtain a metal ingot.

[0050] The metal ingot contains 20.18wt% Ni, 15.16wt% Cr, 3.2wt% Mo, 2.09wt% Cu, 0.73wt% Y, 0.75wt% La, 0.39wt% Ce, 0.13wt% Ti, 0.1wt% Nb, and 0.08wt% V, with the balance being Fe and unavoidable impurities.

[0051] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 550°C at a rate of 8°C / min and held for 30 min. Then, the temperature is increased to 1180°C at a rate of 4°C / min and held for 7.5 h. Finally, the temperature is decreased to 550°C at a rate of 3°C / min and allowed to cool naturally to room temperature for later use.

[0052] S4. After grinding and cutting the homogenized ingot, it is subjected to high-temperature rolling. The temperature is raised to 850℃ at a rate of 4℃ / min, held for 30min, then raised to 1100℃ again, held for 45min, and then rolled at a rolling rate of 1m / s. The deformation per pass is 15%, the total deformation is 75%, and the final rolling temperature is 880℃. After rolling, it is air-cooled to room temperature and set aside for later use.

[0053] S5. The rolled part is subjected to aging strengthening treatment. The rolled part is heated to 420℃ at a rate of 2.5℃ / min and held for 5 hours in an argon atmosphere. Then it is heated to 650℃ and held for 3 hours. Then it is cooled to 300℃ at a rate of 1.5℃ / min and air-cooled to room temperature. The resulting material is processed into a machined blank. The blank is then heated and annealed again. The machined blank is heated to 550℃ and held for 3 hours. Then it is cooled to room temperature at a rate of 4℃ / min to complete the annealing.

[0054] S6. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0055] Comparative Example 1

[0056] Compared with Example 1, this comparative example did not subject the product to aging enhancement treatment;

[0057] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0058] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 800℃ at a rate of 4℃ / min and held for 30 min. Then, the temperature is raised to 1450℃ at a rate of 3℃ / min and held for 35 min. Next, the temperature is raised to 1575℃ at a rate of 1.5℃ / min and held for 30 min. The melting system is then cooled to 1520℃ at a rate of 2℃ / min. Ti, Nb, and V are added and melted evenly. Y, La, and Ce are added and the temperature is raised to 1550℃ again at a rate of 1.5℃ / min. The mixture is stirred and melted for 35 min. After refining and removing impurities, the mixture is cast and naturally cooled under argon atmosphere to obtain a metal ingot.

[0059] The metal ingot contains 19.84 wt% Ni, 14.31 wt% Cr, 2.93 wt% Mo, 1.81 wt% Cu, 0.66 wt% Y, 0.65 wt% La, 0.22 wt% Ce, 0.1 wt% Ti, 0.08 wt% Nb, and 0.06 wt% V, with the balance being Fe and unavoidable impurities.

[0060] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 450°C at a rate of 5°C / min and held for 45 min. Then, the temperature is increased to 1150°C at a rate of 3°C / min and held for 8.5 h. Finally, the temperature is decreased to 500°C at a rate of 2°C / min and allowed to cool naturally to room temperature for later use.

[0061] S4. After the homogenized ingot is ground and cut, it is subjected to high-temperature rolling. The temperature is raised to 800℃ at a rate of 2℃ / min, held for 45min, then raised to 1050℃ again, held for 60min, and then rolled at a rolling rate of 0.8m / s, with a single-pass deformation of 10% and a total deformation of 75%. The final rolling temperature is 850℃. After rolling, it is air-cooled to room temperature for later use.

[0062] S5. After the rolled part is shaped, the machined blank is heated and annealed. The machined blank is heated to 520℃, held for 3 hours, and then cooled to room temperature at a rate of 3℃ / min to complete the annealing.

[0063] S6. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0064] Comparative Example 2

[0065] Compared with Example 1, this comparative example did not undergo high-temperature rolling and aging strengthening treatment;

[0066] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0067] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 800℃ at a rate of 4℃ / min and held for 30 min. Then, the temperature is raised to 1450℃ at a rate of 3℃ / min and held for 35 min. Next, the temperature is raised to 1575℃ at a rate of 1.5℃ / min and held for 30 min. The melting system is then cooled to 1520℃ at a rate of 2℃ / min. Ti, Nb, and V are added and melted evenly. Y, La, and Ce are added and the temperature is raised to 1550℃ again at a rate of 1.5℃ / min. The mixture is stirred and melted for 35 min. After refining and removing impurities, the mixture is cast and naturally cooled under argon atmosphere to obtain a metal ingot.

[0068] The metal ingot contains 19.84 wt% Ni, 14.31 wt% Cr, 2.93 wt% Mo, 1.81 wt% Cu, 0.66 wt% Y, 0.65 wt% La, 0.22 wt% Ce, 0.1 wt% Ti, 0.08 wt% Nb, and 0.06 wt% V, with the balance being Fe and unavoidable impurities.

[0069] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 450°C at a rate of 5°C / min and held for 45 min. Then, the temperature is increased to 1150°C at a rate of 3°C / min and held for 8.5 h. Finally, the temperature is decreased to 500°C at a rate of 2°C / min and allowed to cool naturally to room temperature for later use.

[0070] S4. After the ingot is shaped, a machined blank is obtained and then heated and annealed. The machined blank is heated to 520℃, held for 3 hours, and then cooled to room temperature at a rate of 3℃ / min to complete the annealing.

[0071] S5. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0072] Comparative Example 3

[0073] Compared to Example 1, this comparative example did not use Y, La, and Ce;

[0074] S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use;

[0075] S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are added to the melting furnace in order of melting point. The temperature is raised to 800℃ at a rate of 4℃ / min and held for 30 min. Then, the temperature is raised to 1450℃ at a rate of 3℃ / min and held for 35 min. Next, the temperature is raised to 1575℃ at a rate of 1.5℃ / min and held for 30 min. Finally, the melting system is cooled to 1520℃ at a rate of 2℃ / min. Ti, Nb, and V are added, and the mixture is melted evenly. After refining and removing impurities, the mixture is cast and naturally cooled under argon atmosphere to obtain a metal ingot.

[0076] The metal ingot contains 19.84 wt% Ni, 14.31 wt% Cr, 2.93 wt% Mo, 1.81 wt% Cu, 0.1 wt% Ti, 0.08 wt% Nb, and 0.06 wt% V, with the balance being Fe and unavoidable impurities.

[0077] S3. The metal ingot is subjected to high-temperature homogenization treatment in an argon atmosphere. The temperature is increased to 450°C at a rate of 5°C / min and held for 45 min. Then, the temperature is increased to 1150°C at a rate of 3°C / min and held for 8.5 h. Finally, the temperature is decreased to 500°C at a rate of 2°C / min and allowed to cool naturally to room temperature for later use.

[0078] S4. After grinding and cutting the homogenized ingot, it is rolled at a high temperature of 2℃ / min, heated to 800℃, held for 45min, heated again to 1050℃, held for 60min, and then rolled at a rolling rate of 0.8m / s, with a single-pass deformation of 10%, a total deformation of 75%, and a final rolling temperature of 850℃. After rolling, it is air-cooled to room temperature for later use.

[0079] S5. The rolled part is subjected to aging strengthening treatment. The rolled part is heated to 400℃ at a rate of 2℃ / min and held for 5h in an argon atmosphere. Then it is heated to 630℃ and held for 3h. Then it is cooled to 300℃ at a rate of 1℃ / min and air-cooled to room temperature. The resulting material is processed into a machined blank. The blank is then heated and annealed again. The machined blank is heated to 520℃ and held for 3h. Then it is cooled to room temperature at a rate of 3℃ / min to complete the annealing.

[0080] S6. The annealed machined blank is subjected to surface chromium diffusion treatment to obtain a corrosion-resistant and impact-resistant alloy material.

[0081] Testing plan:

[0082] The mechanical properties of the alloy materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested according to GB / T 228.1-2010.

[0083] The impact resistance of the alloy materials prepared in Examples 1-3 and Comparative Examples 1-3 was tested according to GB / T 229-2020.

[0084] Salt spray resistance was tested on the alloy materials prepared in Examples 1-3 and Comparative Examples 1-3 according to GB / T 10125-2021.

[0085] The test results are shown in Table 1 below.

[0086] Table 1. Test results of corrosion-resistant and impact-resistant alloy materials prepared in Examples 1-3 and Comparative Examples 1-3

[0087]

[0088] As can be seen from the data of Examples 1-3 and Comparative Examples 1-3, the complete process was used in Examples 1-3 of the present invention. Compared with Example 1, the mechanical properties of Examples 2 and 3 increased slightly. This is because the content of corrosion-resistant elements Cr, Mo, and Cu, as well as rare earth elements Ti, Nb, V microalloying, Y, La, and Ce were moderately increased, which further enhanced the grain refinement, grain boundary strengthening, and nano-precipitation effects. However, in Comparative Example 3, the absence of rare earth elements Y, La, and Ce led to coarsening of the grain precipitation, which could not effectively adsorb impurities such as S and P, ultimately resulting in a comprehensive deterioration in impact toughness, mechanical properties, and corrosion resistance.

[0089] Comparative Example 1 did not undergo aging strengthening, which led to a reduction in the precipitation of nano-carbide and a decrease in strength. In Comparative Example 2, the high-temperature rolling process was further reduced compared to Comparative Example 1. Without external force to cause plastic deformation and breakage of coarse dendrites, the alloy material had coarse grains and fewer dislocations. Dendrite segregation was severe, and the grain boundaries became channels for rapid corrosion and crack propagation. Therefore, the strength, toughness, and corrosion resistance all collapsed.

[0090] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant and impact-resistant alloy material, characterized in that: By weight percentage, the corrosion-resistant and impact-resistant alloy material comprises Ni 19.8~20.2wt%, Cr 14.3~15.2wt%, Mo 2.9~3.2wt%, Cu 1.8~2.1wt%, Y 0.65~0.75wt%, La 0.65~0.75wt%, Ce 0.2~0.4wt%, Ti 0.1~0.13wt%, Nb 0.08~0.1wt%, V 0.05~0.08wt%, with the balance being Fe and unavoidable impurities.

2. A processing method for the corrosion-resistant and impact-resistant alloy material as described in claim 1, characterized in that: Includes the following steps: S1. Clean the surface of the raw materials to remove oil and oxide layers, then dry them for later use; S2. Under argon atmosphere protection, Fe, Ni, Cr, Mo, and Cu are placed into the melting furnace in order of melting point, heated and melted. Ti, Nb, and V are added, and after melting and homogenization, Y, La, and Ce are added. The furnace is heated and melted again. After refining and removing impurities, the metal is cast and naturally cooled under argon atmosphere to obtain a metal ingot. S3. Homogenize the metal ingot at high temperature under an argon atmosphere, then cool it naturally to room temperature for later use; S4. After grinding and cutting the homogenized ingot, it is subjected to high-temperature rolling. After rolling, it is air-cooled to room temperature for later use. S5. After the rolled part is subjected to aging strengthening treatment, it is cooled to room temperature in air, and the resulting material is processed into shape to obtain a machined blank, which is then heated and annealed. S6. The annealed machined blank is subjected to surface treatment to obtain an alloy material with corrosion resistance and impact resistance.

3. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S2, during the heating and melting process, the temperature is increased to 800-850℃ at a rate of 4-4.5℃ / min, held for 20-30 minutes, then increased again to 1450-1500℃ at a rate of 3-3.5℃ / min, held for 30-35 minutes, and then increased to 1575-1590℃ at a rate of 1.5-2℃ / min, held for 20-30 minutes.

4. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: When Ti, Nb, and V are added to S2, the temperature is cooled to 1520-1530℃ at a rate of 1-2℃ / min.

5. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S2, when reheating and melting, the temperature is increased to 1550~1560℃ at a rate of 1.5~3℃ / min, and stirred and melted for 25~35min.

6. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S3, during the high-temperature homogenization treatment, the temperature is increased to 450-550℃ at a rate of 5-8℃ / min, held for 30-45min, then increased to 1150-1180℃ at a rate of 3-4℃ / min, held for 7.5-8.5h, and then decreased to 500-550℃ at a rate of 2-3℃ / min.

7. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S4, during high-temperature rolling, the temperature is raised to 800-850℃ at a rate of 2-4℃ / min, held for 30-45min, then raised again to 1050-1100℃, held for 45-60min, and then rolled at a rolling rate of 0.8-1.2m / s. The deformation per pass is 10-15%, the total deformation is 75-80%, and the final rolling temperature is 850-880℃.

8. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In step S5, during the aging strengthening treatment, the rolled part is heated to 400-420℃ at a rate of 2-2.5℃ / min under an argon atmosphere and held for 4.5-5.5h. Then, it is heated again to 630-650℃ and held for 3h. Finally, it is cooled to 300℃ at a rate of 1-1.5℃ / min.

9. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S5, during heat annealing, the machined blank is heated to 520~550℃, held at that temperature for 3 hours, and then cooled to room temperature at a rate of 3~4℃ / min to complete the annealing.

10. The processing technology of the corrosion-resistant and impact-resistant alloy material according to claim 2, characterized in that: In S6, the surface treatment is chromium diffusion.

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