A high-strength nickel-chromium alloy wire and a method for producing the same

Abstract

The application belongs to the field of metal material processing and specifically relates to a high-strength nickel-chromium alloy wire and a preparation method thereof. The high-strength nickel-chromium alloy wire comprises the following raw materials in parts by weight: Cr: 31.0-35.0%, Co: 5.0-7.0%, Mo: 4.0-6.0%, Fe: 5.0-7.0%, Nb: 1.2-2.5%, total amount of Al and Ti: 2.5-5.0%, Ta: 2.0-2.5%, B: 0.3-0.5%, Y: 0.30-0.45%, C: <0.10%, S: <0.015%, and Ni: the balance. After smelting, degassing treatment, high-temperature refining, low-temperature refining, re-melting refining and annealing, the high-strength nickel-chromium alloy wire is forged and rolled into an alloy rod. After multi-pass drawing, annealing, solid solution and aging treatment, the problem of poor plasticity, low strength and easy brittle cracking of the nickel-chromium alloy wire in the prior art can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of metallic materials, specifically relating to a high-strength nickel-chromium alloy wire and its preparation method. Background Technology

[0002] With the advancement of heavy industry technology in my country, my country's nuclear industry and aerospace technology have also made great strides. As the requirements for the performance of metal materials become increasingly stringent, the harsh working environment of the nuclear industry and aircraft, which are subjected to high temperature and high pressure for a long time, has placed new and higher demands on the high strength of metal materials.

[0003] Ni, as the main element used in high-temperature alloy materials, is one of the few alloying elements that can improve the strength of alloy materials without significantly weakening their plasticity, and it also has extremely excellent high-temperature resistance, oxidation resistance, and corrosion resistance.

[0004] The Cr content in existing high-temperature alloys is generally below 25%, and it is mainly dissolved in the γ-phase matrix, which can play a solid solution strengthening role. Increasing the Cr content can significantly improve the strength, hardness, heat treatment hardenability and corrosion resistance of steel, but excessively high Cr content will lead to a sharp decrease in the plastic processing performance of the material, making it prone to processing cracks. This makes it difficult to plastically process the alloy material, and low plasticity will also lead to a decrease in the strength, oxidation resistance and corrosion resistance of the alloy. Summary of the Invention

[0005] The purpose of this invention is to address the problems of low strength and corrosion resistance caused by poor plasticity in high-Cr content nickel-chromium alloy wire materials in the prior art, and to provide a novel high-strength nickel-chromium alloy wire and its preparation method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is as follows:

[0007] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0008] Cr: 31.0-35.0%, Co: 5.0-7.0%, Mo: 4.0-6.0%, Fe: 5.0-7.0%, Nb: 1.2-2.5%, Total Al and Ti: 2.5-5.0%, Ta: 2.0-2.5%, B: 0.3-0.5%, Y: 0.30-0.45%, C: <0.10%, S: <0.015%, Ni balance.

[0009] Preferably, the total amount of Cr and Co is not less than 38.0%.

[0010] Preferably, the total amount of Co and Mo is not less than 10.0%.

[0011] Preferably, the weight ratio of Al to Ti is 1.0-1.5:1.

[0012] Preferably, the weight ratio of Al to Ti is 1.2-1.4:1.

[0013] Preferably, the weight ratio of Fe to Nb is 2.8-4.2:1.

[0014] Preferably, the weight ratio of Mo to B is 11.0-13.3:1.

[0015] Preferably, the content of C is not less than 0.01%.

[0016] Preferably, the content of S is not less than 0.005%.

[0017] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0018] S1: Raw materials are weighed according to the formula mass percentage and processed to obtain a uniform and fine mixed powder;

[0019] S2: Degas the mixed powder and sinter it into a rod blank;

[0020] S3: The billet is placed in a melting furnace for melting, and after high-temperature refining and low-temperature refining, it is remelted and refined again, and then cast into alloy ingots.

[0021] S4: After annealing, the alloy ingot is forged and rolled to prepare alloy wire rods;

[0022] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing passes.

[0023] S6: Processed into alloy wires of the required size and subjected to solution-aging treatment.

[0024] Preferably, the processing step in S1 involves adding the raw material powder to ethanol, stirring magnetically at 500-2000 r / min for 2-5 hours, and then subjecting it to ultrasonic treatment at 50 kHz for 2 hours to obtain an ethanol suspension; filtering, taking the insoluble matter, and placing it in an 80℃ drying oven for drying for 2 hours to obtain a mixed powder.

[0025] Preferably, the degassing process in S2 involves maintaining the furnace temperature at 600-650℃ and the vacuum degree at less than 0.1Pa for 8-12 hours; the sintering process involves heating to 1220-1280℃ at a heating rate of 10-20℃ / min, then applying a gas pressure of 150-200MPa to the surface and maintaining it under constant pressure and temperature for 4-6 hours before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 60-80mm.

[0026] Preferably, in S3, high-temperature refining is smelting at 1750-1850℃ for 30-45 minutes; low-temperature refining is smelting at 1650-1700℃ for 15-25 minutes.

[0027] Preferably, the rolling process in S4 involves holding the material at 1100-1250℃ for 0.5-1.5 hours and then hot-rolling it into alloy wire rod at 950-1100℃.

[0028] Preferably, the S5 pretreatment involves heating the alloy wire rod to 950°C and holding it at that temperature for 1.5 hours, then softening it with oil cooling, followed by alkaline boiling, high-pressure water washing, acid washing, and then ultrasonic cleaning. The drawing process involves adding a lubricant before drawing and then performing multiple drawing passes to obtain the alloy wire. The annealing process involves vacuum annealing after 6-10 drawing passes at a temperature of 850-950°C.

[0029] Preferably, in S6, the solid solution is dissolved in nitrogen, heated to 950-1050℃, held for 2-3 hours, then heated to 1050-1100℃, held for 2-3 hours, then heated to 1100-1150℃, held for 1-2 hours, then heated to 1150-1170℃, held for 1-2 hours, and then rapidly water-quenched to obtain the solid solution alloy; the aging process involves heating to 800-850℃, holding for 3-8 hours, air cooling, then heating to 750-770℃, holding for 10-15 hours, and then air cooling.

[0030] The present invention has the following beneficial effects:

[0031] (1) This invention provides a high-strength nickel-chromium alloy wire with Ni-Cr as the matrix, ensuring the material's high strength, high-temperature oxidation resistance, and corrosion resistance; Co can improve the anti-carburization performance, plasticity, and hot working performance; Mo can refine the grains and improve the alloy's thermal stability. The addition of Mo and Co achieves solid solution strengthening, enhancing its high-temperature oxidation resistance and thermal strength. A slightly excessive amount of Mo and Co can also form carbides with C, and hard phases such as cobalt carbide are dispersed in the solid solution strengthened matrix, improving high-temperature strength and plasticity; in addition, Mo has the effect of inhibiting carbide polymerization, achieving fine and uniform distribution, stabilizing the alloy structure, and balancing high-temperature hardness. Therefore, the appropriate amount of Mo and Co added and their dosage have a positive impact on improving the mechanical strength and plasticity of Ni-Cr alloy.

[0032] (2) This invention provides a high-strength nickel-chromium alloy wire. First, a certain amount of Nb and Fe are added to the alloy. Fe can control thermal expansion; Nb can reduce the tendency of strain cracking. The reasonable design of the Ni-Fe alloy composition ratio can improve the alloy's plasticity, high-temperature strength, corrosion resistance and other properties. In addition, Nb has a good affinity with O and can generate stable oxide Nb2O5, which improves the stability of the oxide and has the effect of delaying corrosion and improving strength. Second, a trace amount of rare earth element Y is added to the alloy. On the one hand, Y works synergistically with Nb to reduce the porosity between oxides at high temperatures and reduce the diffusion rate of Cr ions to the outer layer, thus having good high-temperature oxidation resistance. On the other hand, by forming coordination with O and S at high temperatures, nanoparticles can be preferentially formed, which improves the high-temperature oxidation performance of the material. Its number density at the γ, γ′, γ″ phase interfaces, grain boundaries and dislocations is higher, which enhances high-temperature strength and oxidation resistance.

[0033] (3) This invention provides a high-strength nickel-chromium alloy wire. A certain amount of Al and Ti are added to the alloy. First, they can form a dispersed γ′ phase, which improves the high-temperature strength of the alloy. Second, they precipitate during the aging process and are evenly distributed in the matrix, which can further improve the strength and corrosion resistance of the material at high temperatures. Third, the appropriate ratio is conducive to the precipitation of the γ′ dispersed phase, which improves the high-temperature performance of the nickel-based high-temperature alloy. Fourth, they are active elements, which improve the weldability of the alloy material.

[0034] (4) The present invention provides a high-strength nickel-chromium alloy wire, in which a certain proportion of Mo, Fe and B are added. First, during the high-temperature remelting process, a reaction can occur to form the hard phases of Mo2FeB2 and Mo2NiB2 ternary borides, which have strong polar BB bonds and excellent mechanical properties such as corrosion resistance, hardness and wear resistance.

[0035] (5) This invention provides a method for preparing high-strength nickel-chromium alloy wire. First, alcohol washing reduces impurity content, minimizes internal defects, and effectively reduces the precipitation and segregation of harmful carbides. Second, high- and low-temperature refining and remelting further remove and reduce harmful impurities, improving the purity and plasticity of the alloy; simultaneously, it promotes the formation of ternary boride hard phases, improving mechanical properties. Third, a degassing process further removes volatiles and surface oxide layers, improving alloy strength. Fourth, a multi-step graded solution treatment under nitrogen atmosphere ensures that the alloy composition is fully and uniformly distributed after multiple solution treatments, reducing the impact of oxidation; a graded aging treatment adjusts the size, quantity, and distribution of the strengthening phases, resulting in the coexistence of coarse and fine γ′ phases, exhibiting optimal comprehensive performance. Detailed implementation method:

[0036] The present invention will be described in detail below with reference to embodiments. However, it should be understood that the following embodiments are merely illustrative examples of implementation of the present invention and are not intended to limit the scope of the present invention.

[0037] Example 1

[0038] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0039] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0040] The weight ratio of Al to Ti is 1.3:1.

[0041] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0042] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After stirring magnetically at 1000r / min for 4h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0043] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 630℃ and the vacuum degree at less than 0.1Pa for 10h; the sintering process is to heat the powder to 1250℃ at a heating rate of 15℃ / min, then apply a gas pressure of 180MPa to the surface, and keep it under constant pressure and temperature for 5h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 70mm;

[0044] S3: Place the billet into a melting furnace for melting, refine it at a high temperature of 1800℃ for 40 minutes, refine it at a low temperature of 1650℃ for 25 minutes, remelt and refine it again, and cast it into an alloy ingot.

[0045] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1250℃ for 0.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0046] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0047] S6: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1000℃, held for 2.5h, then heated to 1050℃, held for 3h, then heated to 1130℃, held for 1.5h, then heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain the solution-treated alloy; the aging treatment is carried out by heating to 820℃, holding for 5h, air cooling, then heating to 760℃, holding for 12h, and then air cooling.

[0048] Example 2

[0049] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0050] Cr: 31.0%, Co: 7.0%, Mo: 4.0%, Fe: 6.0%, Nb: 2.0%, Total Al and Ti: 4.0%, Ta: 2.5%, B: 0.3%, Y: 0.45%, C: 0.01%, S: 0.005%, Ni balance.

[0051] The weight ratio of Al to Ti is 1.3:1.

[0052] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0053] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After magnetic stirring at 2000r / min for 2h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0054] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 600℃ and the vacuum degree at less than 0.1Pa for 12h; the sintering process is to heat the powder to 1220℃ at a heating rate of 10℃ / min, then apply a gas pressure of 150MPa to the surface, and keep it under constant pressure and temperature for 6h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 80mm;

[0055] S3: Place the billet into a melting furnace for melting, refine it at a high temperature of 1850℃ for 30 minutes, refine it at a low temperature of 1700℃ for 15 minutes, remelt and refine it again, and cast it into an alloy ingot.

[0056] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1100℃ for 1.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 950℃.

[0057] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 850℃, ultimately yielding Φ1.0mm alloy wire.

[0058] S6: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1050℃, held for 2 hours, then heated to 1100℃, held for 2 hours, then heated to 1150℃, held for 1 hour, then heated to 1170℃, held for 1 hour, and then rapidly water-quenched to obtain a solution-treated alloy; the aging treatment is carried out by heating to 800℃, holding for 8 hours, air cooling, then heating to 750℃, holding for 15 hours, and then air cooling.

[0059] Example 3

[0060] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0061] Cr: 35.0%, Co: 5.0%, Mo: 5.0%, Fe: 7.0%, Nb: 2.5%, Total Al and Ti: 5.0%, Ta: 2.0%, B: 0.45%, Y: 0.40%, C: 0.06%, S: 0.010%, Ni balance.

[0062] The weight ratio of Al to Ti is 1.3:1.

[0063] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0064] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After magnetic stirring at 500r / min for 5h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0065] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 650℃ and the vacuum degree at less than 0.1Pa for 8h; the sintering process is to heat the powder to 1280℃ at a heating rate of 20℃ / min, then apply a gas pressure of 200MPa to the surface, and keep it under constant pressure and temperature for 4h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 60mm;

[0066] S3: Place the billet into a melting furnace for melting, refine it at a high temperature of 1750℃ for 45 minutes, refine it at a low temperature of 1650℃ for 25 minutes, remelt and refine it again, and cast it into an alloy ingot.

[0067] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1200℃ for 1 hour and hot-rolled into Φ8.5mm alloy wire rod at 1050℃.

[0068] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 950℃, ultimately yielding Φ1.0mm alloy wire.

[0069] S6: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 950℃, held for 3 hours, then heated to 1050℃, held for 3 hours, then heated to 1100℃, held for 2 hours, then heated to 1150℃, held for 2 hours, and then rapidly water-quenched to obtain a solution-treated alloy; the aging treatment is carried out by heating to 850℃, holding for 3 hours, air cooling, then heating to 770℃, holding for 10 hours, and then air cooling.

[0070] Example 4

[0071] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0072] Cr: 32.0%, Co: 6.5%, Mo: 6.0%, Fe: 5.0%, Nb: 1.2%, Total Al and Ti: 2.5%, Ta: 2.2%, B: 0.5%, Y: 0.30%, C: 0.09%, S: 0.014%, Ni balance.

[0073] The weight ratio of Al to Ti is 1.3:1.

[0074] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0075] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After magnetic stirring at 1500r / min for 3h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0076] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 630℃ and the vacuum degree at less than 0.1Pa for 10h; the sintering process is to heat the powder to 1280℃ at a heating rate of 15℃ / min, then apply a gas pressure of 150MPa to the surface, and keep it under constant pressure and temperature for 6h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 70mm;

[0077] S3: Place the billet into a melting furnace for melting, refine it at a high temperature of 1800℃ for 35 minutes, refine it at a low temperature of 1680℃ for 20 minutes, remelt and refine it again, and cast it into an alloy ingot.

[0078] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1150℃ for 1.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0079] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0080] S6: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1000℃, held for 2.5h, then heated to 1080℃, held for 2.5h, then heated to 1100℃, held for 2h, then heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain the solution-treated alloy; the aging treatment is carried out by heating to 800℃, holding for 5h, air cooling, then heating to 750℃, holding for 15h, and then air cooling.

[0081] Example 5

[0082] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0083] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.41%, Y: 0.35%, C: 0.06%, S: 0.010%, Ni balance.

[0084] The weight ratio of Al to Ti is 1.3:1.

[0085] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0086] Example 6

[0087] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0088] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.50%, Y: 0.35%, C: 0.06%, S: 0.010%, Ni balance.

[0089] The weight ratio of Al to Ti is 1.3:1.

[0090] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0091] Example 7

[0092] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0093] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 2.1%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0094] The weight ratio of Al to Ti is 1.3:1.

[0095] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0096] Example 8

[0097] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0098] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.4%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0099] The weight ratio of Al to Ti is 1.3:1.

[0100] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0101] Example 9

[0102] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0103] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0104] The weight ratio of Al to Ti is 1.2:1.

[0105] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0106] Example 10

[0107] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0108] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0109] The weight ratio of Al to Ti is 1.4:1.

[0110] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0111] Example 11

[0112] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0113] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0114] The weight ratio of Al to Ti is 1.0:1.

[0115] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0116] Example 12

[0117] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0118] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0119] The weight ratio of Al to Ti is 1.5:1.

[0120] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0121] Comparative Examples 1-13 are all compared with Example 1:

[0122] Comparative Example 1

[0123] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0124] Cr: 31.0%, Co: 5.0%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0125] The weight ratio of Al to Ti is 1.3:1.

[0126] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0127] Comparative Example 2

[0128] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0129] Cr: 32.0%, Co: 5.0%, Mo: 4.0%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0130] The weight ratio of Al to Ti is 1.3:1.

[0131] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0132] Implement Comparative Example 3

[0133] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0134] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 7.0%, Nb: 1.2%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0135] The weight ratio of Al to Ti is 1.3:1.

[0136] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0137] Comparative Example 4

[0138] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0139] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0140] The weight ratio of Al to Ti is 1:1.3.

[0141] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0142] Comparative Example 5

[0143] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0144] Cr: 32.0%, Co: 6.2%, Mo: 4.0%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0145] The weight ratio of Al to Ti is 1.3:1.

[0146] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0147] Comparative Example 6

[0148] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0149] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, C: 0.06%, S: 0.01%, Ni balance.

[0150] The weight ratio of Al to Ti is 1.3:1.

[0151] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0152] Comparative Example 7

[0153] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0154] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, S: 0.01%, Ni balance.

[0155] The weight ratio of Al to Ti is 1.3:1.

[0156] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0157] Implemented Comparative Example 8

[0158] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0159] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, Ni balance.

[0160] The weight ratio of Al to Ti is 1.3:1.

[0161] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0162] Comparative Example 9

[0163] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0164] Cr: 32.0%, Co: 6.2%, W: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0165] The weight ratio of Al to Ti is 1.3:1.

[0166] A method for preparing a high-strength nickel-chromium alloy wire is the same as in Specific Example 1.

[0167] Implement Comparative Example 10

[0168] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0169] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0170] The weight ratio of Al to Ti is 1.3:1.

[0171] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0172] S1: Weigh the raw materials according to the formula mass percentage and place them in a degassing furnace for degassing and sintering into rod blanks; wherein, the degassing process is to maintain the furnace temperature at 630℃ and the vacuum degree at less than 0.1Pa for 10h; the sintering process is to heat the material to 1250℃ at a heating rate of 15℃ / min, then apply a gas pressure of 180MPa to the surface and keep it under constant pressure and temperature for 5h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 70mm;

[0173] S2: The billet is placed in a melting furnace for melting, and then refined at a high temperature of 1800℃ for 40 minutes; at a low temperature of 1650℃ for 25 minutes; then remelted and refined, and cast into an alloy ingot.

[0174] S3: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1250℃ for 0.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0175] S4: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0176] S5: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1000℃, held for 2.5h, then heated to 1050℃, held for 3h, then heated to 1130℃, held for 1.5h, then heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain the solution-treated alloy; the aging treatment is carried out by heating to 820℃, holding for 5h, air cooling, then heating to 760℃, holding for 12h, and then air cooling.

[0177] Comparative Example 11

[0178] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0179] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0180] The weight ratio of Al to Ti is 1.3:1.

[0181] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0182] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After stirring magnetically at 1000r / min for 4h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0183] S2: The mixed powder is placed in a melting furnace for melting, and then refined at a high temperature of 1800℃ for 40 minutes; at a low temperature of 1650℃ for 25 minutes; then remelted and refined, and cast into alloy ingots.

[0184] S3: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1250℃ for 0.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0185] S4: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0186] S5: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1000℃, held for 2.5h, then heated to 1050℃, held for 3h, then heated to 1130℃, held for 1.5h, then heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain the solution-treated alloy; the aging treatment is carried out by heating to 820℃, holding for 5h, air cooling, then heating to 760℃, holding for 12h, and then air cooling.

[0187] Comparative Example 12

[0188] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0189] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0190] The weight ratio of Al to Ti is 1.3:1.

[0191] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0192] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After stirring magnetically at 1000r / min for 4h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0193] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 630℃ and the vacuum degree at less than 0.1Pa for 10h; the sintering process is to heat the powder to 1250℃ at a heating rate of 15℃ / min, then apply a gas pressure of 180MPa to the surface, and keep it under constant pressure and temperature for 5h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 70mm;

[0194] S3: Place the billet into a melting furnace for melting and casting into alloy ingots;

[0195] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1250℃ for 0.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0196] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0197] S6: Perform solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1000℃, held for 2.5h, then heated to 1050℃, held for 3h, then heated to 1130℃, held for 1.5h, then heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain the solution-treated alloy; the aging treatment is carried out by heating to 820℃, holding for 5h, air cooling, then heating to 760℃, holding for 12h, and then air cooling.

[0198] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0199] Cr: 12.0%, Co: 3.5%, Mo: 4.5%, Fe: 6.6%, Nb: 2.64%, W: 4.0%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.02%, Zr: 0.08%, RE: 0.30%, C: 0.06%, Ni balance.

[0200] The weight ratio of Al to Ti is 1.2:1.

[0201] The above RE is Y.

[0202] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0203] S1: Weigh the raw materials according to the formula mass percentage, add them to ethanol, stir magnetically at 1000r / min for 3h, and then sonicate at 50KHz for 2h to obtain an ethanol suspension; filter, take the insoluble matter, and dry it in an 80℃ drying oven for 2h to obtain a mixed powder.

[0204] S2: The mixed powder in S1 is placed in a melting furnace for melting. After melting at 1800℃ for 40 minutes, it is melted at 1650℃ for 25 minutes. Then, it is remelted and refined, and cast into alloy ingots.

[0205] S3: After slowly heating the alloy ingot to 1050℃ and holding it at that temperature for 35 hours for annealing, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. The rolling process involves holding the billet at 1050℃ for 0.5 hours and hot rolling it into Φ8.5mm alloy wire rod at 1000℃.

[0206] S4: The alloy wire rod is heated to 950℃ and held for 1.5 hours, then softened by oil cooling, boiled in alkali, then washed with high pressure water, then pickled, and then ultrasonically cleaned; then it is drawn and annealed. Lubricant is added before drawing, and then multiple drawing passes are performed; after 6-10 drawing passes, vacuum annealing is performed at a temperature of 700℃ to finally obtain Φ1.0mm alloy wire.

[0207] S5: The alloy wire is subjected to solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1120℃, held for 3 hours, and then rapidly water-quenched to obtain a solution-treated alloy; the aging treatment is carried out by heating to 760℃, holding for 12 hours, and then air-cooling.

[0208] Comparative Example 13

[0209] A high-strength nickel-chromium alloy wire comprises the following powder raw materials in parts by weight:

[0210] Cr: 32.0%, Co: 6.2%, Mo: 5.5%, Fe: 5.8%, Nb: 1.8%, Total Al and Ti: 4.0%, Ta: 2.2%, B: 0.45%, Y: 0.35%, C: 0.06%, S: 0.01%, Ni balance.

[0211] The weight ratio of Al to Ti is 1.3:1.

[0212] A method for preparing a high-strength nickel-chromium alloy wire includes the following steps:

[0213] S1: The raw materials are weighed according to the formula mass percentage and added to ethanol. After stirring magnetically at 1000r / min for 4h, the mixture is ultrasonically treated at 50KHz for 2h to obtain an ethanol suspension. The suspension is filtered, the insoluble matter is taken and placed in an 80℃ drying oven for 2h to obtain a uniform and fine mixed powder.

[0214] S2: The mixed powder is placed in a degassing furnace for degassing and sintering into a rod blank; wherein, the degassing process is to maintain the furnace temperature at 630℃ and the vacuum degree at less than 0.1Pa for 10h; the sintering process is to heat the powder to 1250℃ at a heating rate of 15℃ / min, then apply a gas pressure of 180MPa to the surface, and keep it under constant pressure and temperature for 5h before cooling in the furnace to obtain a cylindrical powder sintered rod blank with a diameter of 70mm;

[0215] S3: Place the billet into a melting furnace for melting, refine it at a high temperature of 1800℃ for 40 minutes, refine it at a low temperature of 1650℃ for 25 minutes, remelt and refine it again, and cast it into an alloy ingot.

[0216] S4: The alloy ingot is slowly heated to 1050℃ and held for 35 hours for annealing. Then, it is forged into alloy billet I at 950℃ with a forging ratio of 3.5. After tempering at 1000℃ for 1.5 hours, it is forged into alloy billet II at 1050℃ with a forging ratio of 6. Then, it is forged into alloy billet III at the same temperature with a forging ratio of 3. Finally, it is held at 1250℃ for 0.5 hours and hot-rolled into Φ8.5mm alloy wire rod at 1100℃.

[0217] S5: After pretreatment, the alloy wire rod undergoes multiple drawing-annealing processes. The pretreatment process involves heating the alloy wire rod to 950℃ and holding it for 1.5 hours, followed by oil cooling for softening, alkaline boiling, high-pressure water washing, acid washing, and ultrasonic cleaning. Then, drawing is performed, with lubricant added before drawing, followed by multiple drawing processes to obtain alloy wire. Annealing is performed after 6-10 drawing processes, followed by vacuum annealing at 900℃, ultimately yielding Φ1.0mm alloy wire.

[0218] S5: The alloy wire is subjected to solution-aging treatment; the solution treatment is carried out in a nitrogen atmosphere, heated to 1160℃, held for 1.5h, and then rapidly water-quenched to obtain a solution-treated alloy; the aging treatment is carried out by heating to 760℃, holding for 12h, and then air-cooling.

[0219] The physical properties of the high-strength nickel-chromium alloy wires prepared in Examples 1-12 and Comparative Examples 1-13 of the present invention were measured respectively, and the results are shown in Table 1.

[0220] Table 1 Physical test performance of each embodiment

[0221]

[0222] As can be observed from Examples 1-12, the high-strength nickel-chromium alloy wire of the present invention has excellent mechanical properties, balancing mechanical strength and plasticity, and exhibits excellent comprehensive performance; it also has excellent resistance to high-temperature oxidation and high-temperature corrosion.

[0223] As can be observed from Examples 1 and Comparative Examples 1-2, the addition of appropriate amounts of Mo and Co in the nickel-based high-temperature alloy wire of the present invention achieves solid solution strengthening, improving its resistance to high-temperature oxidation, thermal strength, and plasticity. As can be observed from Examples 1 and Comparative Example 3, Fe and Nb have a positive impact on the plasticity of the alloy wire; Nb reduces the tendency for strain cracking, and a rational design of the Ni-Fe alloy composition ratio can improve the alloy's high-temperature strength and corrosion resistance. As can be observed from Examples 1 and Comparative Example 4, Al and Ti play an important role in forming a dispersed γ′ phase and improving mechanical properties. As can be observed from Examples 1 and Comparative Example 5, B, Mo, Fe, and Nb... The ternary hard phase formed by the reaction of i exhibits excellent mechanical strength and corrosion resistance; it can be observed from Example 1 and Comparative Example 6 that Y has good resistance to high-temperature oxidation and can also improve high-temperature strength; it can be observed from Example 1 and Comparative Examples 7-8 that trace amounts of C can improve strength and plasticity; trace amounts of S can improve thermal strength; it can be observed from Example 1 and Comparative Example 9 that both W and Mo are thermal strength elements, but W carbides are coarse and unevenly distributed, which easily causes uneven hardness, while Mo carbides are fine and dispersed, resulting in better strength and corrosion resistance; it can be observed from Example 1 and Comparative Examples 10-13 that a suitable preparation process has a significant impact on the performance of the alloy wire.

[0224] The testing method is as follows:

[0225] (1) Mechanical property test: Refer to GB / T 228.2-2015 "Metallic materials - Tensile testing - Part 1: High temperature test method", test temperature 800±4℃; refer to GB / T 228-2002 "Metallic materials - Tensile testing at room temperature", test temperature 23±5℃.

[0226] (2) Thermal oxidation test: The test was conducted according to HB5258-83 "Determination of oxidation resistance of steel and alloys". The sample was placed in a ceramic boat preheated to constant weight, ensuring line contact between the sample and the boat wall. The oxidation test was conducted in a box furnace at 800℃. The static weight gain method was used. After 100 hours of oxidation, the ceramic boat was removed and weighed on an electronic analytical balance (sensitivity 0.1 mg), and the weight change was measured.

[0227] (3) Hot corrosion test: The sample was coated with a saturated mixed solution of NaCl and Na2SO4 at a mass ratio of 1:3. The amount of salt coated was determined by weighing the sample before and after coating, and the amount of salt was controlled to be 3.0 mg / cm³. 2 The samples were placed in a high-temperature furnace and corroded under the same temperature conditions. One or more samples were taken out at different times, cooled, and weighed. The experiment lasted for 20 hours at a temperature of 800℃. The ceramic boats were then removed and weighed using an electronic analytical balance (sensitivity 0.1 mg) to determine the mass change of the samples during the oxidation process.

[0228] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-strength nickel-chromium alloy wire characterized by: The powder raw materials include the following weight parts: Cr: 31.0-35.0%, Co: 5.0-7.0%, Mo: 4.0-6.0%, Fe: 5.0-7.0%, Nb: 1.2-2.5%, the total amount of Al and Ti: 2.5-5.0%, Ta: 2.0-2.5%, B: 0.3-0.5%, Y: 0.30-0.45%, C: <0.10%, S: <0.015%, Ni balance; The total amount of Cr and Co is not less than 38.0%; the total amount of Co and Mo is not less than 10.0%; the weight ratio of Al and Ti is 1.2-1.4:1; the weight ratio of Fe and Nb is 2.8-4.2:1; the weight ratio of Mo and B is 11.0-13.3:1; the content of C is not less than 0.01%; the content of S is not less than 0.005%.

2. The method of claim 1, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: The preparation method comprises the following steps: ​ S1: raw materials are weighed according to the formula mass percentage, and a uniform and refined mixed powder is obtained by processing; S2: the mixed powder is degassed and sintered into a rod blank; S3: the rod blank is placed into a smelting furnace for smelting, high-temperature refining, low-temperature refining, and then remelting refining to cast an alloy ingot; The high-temperature refining is smelting at 1750-1850℃ for 30-45min; the low-temperature refining is smelting at 1650-1700℃ for 15-25min; S4: the alloy ingot is annealed and then forged and rolled to prepare an alloy wire rod; S5: the alloy wire rod is pretreated and then subjected to multi-pass drawing and annealing; S6: the alloy wire rod is processed into an alloy wire of a required size and subjected to solid solution and aging treatment.

3. The method of claim 2, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: In S1, the processing process is that the raw material powder is added into ethanol, subjected to magnetic stirring at 500-2000r / min for 2-5h, and then subjected to ultrasonic treatment at 50KHz for 2h to obtain an ethanol suspension; the suspension is filtered, and the insoluble substance is taken out and dried in a 80℃ drying box for 2h to obtain a mixed powder. ​ 4. The method of claim 2, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: In S2, the degassing treatment process is that the furnace temperature is kept at 600-650℃, the vacuum degree is less than 0.1Pa, and the keeping time is 8-12h; the sintering process is that the heating rate is 10-20℃ / min, the temperature is raised to 1220-1280℃, then a gas pressure of 150-200MPa is applied to the surface, and the constant pressure and temperature are kept for 4-6h, and the furnace is cooled to obtain a cylindrical powder sintered rod blank with a diameter of 60-80mm. ​ 5. The method of claim 2, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: In S4, the rolling process is that the temperature is kept at 1100-1250℃ for 0.5-1.5h, and the alloy wire rod is hot-rolled at 950-1100℃. ​ 6. The method of claim 2, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: In S5, the pretreatment is that the alloy wire rod is heated to 950℃ and kept for 1.5h, and then subjected to softening treatment by oil cooling, alkali boiling, high-pressure water washing, acid washing after water washing, and ultrasonic cleaning again; the drawing is that a lubricant is added before drawing, and then multi-pass drawing is performed to obtain an alloy wire; the annealing is vacuum annealing after 6-10 passes of drawing, and the annealing temperature is 850-950℃. ​ 7. The method of claim 2, wherein the high-strength nickel-chromium alloy wire is prepared by the steps of: The solid solution in S6 is under nitrogen environment, heated to 950-1050℃, kept for 2-3h, continuously heated to 1050-1100℃, kept for 2-3h, continuously heated to 1100-1150℃, kept for 1-2h, continuously heated to 1150-1170℃, kept for 1-2h, and then rapidly water quenched to obtain the solid solution alloy; the aging is heated to 800-850℃, kept for 3-8h, air cooled, then heated to 750-770℃, kept for 10-15h, and air cooled. ​

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