A synergistic toughening production process method of diamond wire

Abstract

The application relates to a synergic toughening production process method of a diamond wire and belongs to the technical field of diamond wire preparation. In order to solve the problems of low production efficiency and high cost of the existing synergic toughening method of the diamond wire, the application provides a synergic toughening production process method of the diamond wire, which sequentially carries out first drawing, first austenitizing heat treatment, second drawing, second austenitizing heat treatment, third drawing and low-temperature annealing treatment on a rod; the temperature of the low-temperature annealing is 520-620 DEG C, and the holding time of the low-temperature annealing is 10s or 20s. The application uses the low-temperature annealing to eliminate the structure stress, retains the drawing deformation structure, realizes the purpose of work hardening, maintains the strength, quickly and effectively obtains higher plasticity, realizes the synergic toughening production of the diamond wire, and the obtained diamond wire reaches 1512-2049 MPa in the five-time tensile test tensile strength, and the cross-section shrinkage rate is 38.1-60.7%.

Description

Technical Field

[0001] This invention belongs to the field of diamond wire preparation technology, and particularly relates to a synergistic strengthening and toughening production process for diamond wire. Background Technology

[0002] Diamond wire is a wire-like product made of high-carbon steel, processed through cold drawing, cold rolling, and other techniques. Depending on its application, diamond wire can be further processed into different shapes and specifications. Due to its high strength and wear resistance, it has wide applications in many industrial and engineering fields, such as spring manufacturing, wire rope production, tool steel products, machine parts, cable sheathing, and the manufacture of wire mesh and wire cloth. It plays an important role in various applications including lifting equipment, construction, mining, machinery manufacturing, and cable protection.

[0003] In the production of diamond wire, cutting speed is a parameter that needs to be strictly controlled. The high strength of diamond wire allows it to withstand higher cutting speeds and loads, significantly improving cutting efficiency, which is particularly crucial in large-scale industrial production, effectively reducing cutting time and increasing production efficiency. However, while diamond wire possesses high hardness and strength, its corresponding toughness and plasticity are relatively low, making it prone to breakage under high loads and speeds. This compromises the continuity and stability of the cutting process, consequently reducing cutting precision and quality. Therefore, the synergistic design of strength and toughness in diamond wire is of great significance in industrial applications, especially in improving cutting efficiency and precision.

[0004] Patent application CN107841606A, entitled "A Method for Improving the Breaking Force and Strength of Diamond Wire Busbars," improves breaking force and strength by drawing, electroplating, and then aging at a low temperature of 60–120°C for 60–80 minutes. However, the long aging time prolongs the production cycle and increases production costs. Patent application CN115106391A, entitled "An Improved High-Carbon Steel Diamond Wire and its Preparation Process," improves the performance of diamond wire through two drawing processes and annealing at 100–150°C for 0.5–2 hours after the first drawing. However, this method has a low annealing temperature and a long annealing time, increasing production energy consumption and the production cycle.

[0005] Improving the production efficiency and reducing the production cost of diamond wire synergistic toughening remains an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the issues of low production efficiency and high cost in existing diamond wire synergistic strengthening methods, this invention provides a diamond wire synergistic strengthening production process.

[0007] The technical solution of the present invention:

[0008] A synergistic strengthening and toughening production process for diamond wire involves first drawing a wire rod to obtain diamond wire, subjecting the first-drawn diamond wire to a first austenitizing heat treatment, isothermal quenching, followed by a second drawing, subjecting the second-drawn diamond wire to a second austenitizing heat treatment, isothermal quenching, followed by a third drawing, and subjecting the third-drawn diamond wire to a low-temperature annealing treatment, followed by air cooling to room temperature; the low-temperature annealing temperature is 520–620°C, and the holding time for the low-temperature annealing is 10 s or 20 s.

[0009] Furthermore, the diameter of the diamond wire obtained from the first drawing is 2.30 mm.

[0010] Furthermore, the temperature of the first austenitizing heat treatment is 1020℃, and the holding time is 44s.

[0011] Furthermore, the diameter of the diamond wire obtained from the second drawing is 0.73 mm.

[0012] Furthermore, the temperature of the second austenitizing heat treatment is 1020℃, and the holding time is 26s.

[0013] Furthermore, the diameter of the diamond wire obtained from the third drawing is 0.46 mm.

[0014] Furthermore, the isothermal quenching conditions are all 90°C water-mixed quenching fluid.

[0015] Furthermore, the water-mixed quenching fluid contains a water-soluble quenching fluid of high molecular weight polymer with a volume percentage of 6-13%.

[0016] The beneficial effects of this invention are:

[0017] The synergistic strengthening and toughening production process for diamond wire provided by this invention utilizes low-temperature annealing to eliminate structural stress, retain the drawn deformation structure, and achieve work hardening. This maintains strength while rapidly and effectively obtaining high plasticity, thus realizing the synergistic strengthening and toughening production of diamond wire. Diamond wire produced using this synergistic strengthening and toughening process exhibits a tensile strength of 1512–2049 MPa in five tensile tests, with a reduction of area of ​​38.1–60.7%.

[0018] The diamond wire produced through synergistic toughening ensures that it is not easily broken under high load and high speed, maintaining the continuity and stability of the cutting process and further improving the accuracy and quality of cutting. At the same time, the service life of the diamond wire is also extended, as it can deform under stress without easily breaking, maintaining good performance during long-term high-intensity use, reducing replacement frequency and lowering production costs.

[0019] Compared to existing low-temperature annealing processes, the annealing time of this invention is significantly shortened, thereby effectively shortening the entire production cycle. This not only improves production efficiency but also further reduces the production cost of synergistically toughened diamond wire. Attached Figure Description

[0020] Figure 1 Here is a scanning electron microscope image of the structure of the diamond wire after low-temperature annealing heat treatment in Example 1;

[0021] Figure 2 This is a scanning electron microscope image of the tissue of the diamond wire after the third drawing in Example 1;

[0022] Figure 3 This is a scanning electron microscope image of the microstructure of diamond wire after three austenitization processes, as shown in Comparative Example 1. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to embodiments, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention. In the following embodiments, the process equipment or apparatus not specifically specified are all conventional equipment or apparatus in the art. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commercially available; unless otherwise specified, the technical means used in the embodiments of the present invention are all conventional means well known to those skilled in the art.

[0024] Example 1

[0025] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0026] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0027] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0028] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0029] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0030] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0031] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0032] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0033] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 520℃ for 10s, and then air-cooled to room temperature.

[0034] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0035] In this embodiment, after the first austenitizing heat treatment, the average tensile strength of the 2.30mm diamond wire in five tensile tests was 1329MPa, and the average reduction of area was 48.2%; after the second austenitizing heat treatment, the average tensile strength of the 0.73mm diamond wire in five tensile tests was 1391MPa, and the average reduction of area was 46.3%; after low-temperature annealing, the average tensile strength of the diamond wire in five tensile tests was 2024MPa, and the average reduction of area was 45.7%.

[0036] Example 2

[0037] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0038] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0039] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0040] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0041] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0042] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0043] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0044] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0045] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 540℃ for 10s, and then air-cooled to room temperature.

[0046] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0047] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 2049 MPa in five tensile tests, and the average reduction of area was 38.1%.

[0048] Example 3

[0049] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0050] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0051] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0052] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0053] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0054] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0055] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0056] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0057] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 580℃ for 10s, and then air-cooled to room temperature.

[0058] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0059] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1887 MPa in five tensile tests, and the average reduction of area was 58.8%.

[0060] Example 4

[0061] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0062] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0063] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0064] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0065] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0066] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0067] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0068] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0069] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 620℃ for 10s, and then air-cooled to room temperature.

[0070] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0071] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1949 MPa in five tensile tests, and the average reduction of area was 53.3%.

[0072] Example 5

[0073] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0074] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0075] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0076] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0077] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0078] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0079] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0080] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0081] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 520℃ for 20s, and then air-cooled to room temperature.

[0082] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0083] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1742 MPa in five tensile tests, and the average reduction of area was 57.1%.

[0084] Example 6

[0085] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0086] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0087] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0088] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0089] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0090] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0091] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0092] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0093] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 540℃ for 20s, and then air-cooled to room temperature.

[0094] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0095] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1894 MPa in five tensile tests, and the average reduction of area was 48.5%.

[0096] Example 7

[0097] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0098] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0099] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0100] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0101] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0102] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0103] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0104] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0105] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 580℃ for 20s, and then air-cooled to room temperature.

[0106] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0107] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1654 MPa in five tensile tests, and the average reduction of area was 60.7%.

[0108] Example 8

[0109] This embodiment provides a method for the synergistic strengthening and toughening production of diamond wire.

[0110] The chemical composition of the diamond wire used in this embodiment, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0111] The synergistic strengthening and toughening production process for diamond wire in this embodiment includes the following steps:

[0112] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0113] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0114] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0115] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0116] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0117] (6) The diamond wire obtained from the third drawing is subjected to low-temperature annealing. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 620℃ for 20s, and then air-cooled to room temperature.

[0118] The water-mixed quenching fluid used in this embodiment contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymer, and its main component is poly(ethylene glycol) polymer.

[0119] In this embodiment, the average tensile strength of the diamond wire after low-temperature annealing was 1512 MPa in five tensile tests, and the average reduction of area was 48.8%.

[0120] Comparative Example 1

[0121] This comparative example provides a current heat treatment process for diamond wire.

[0122] The chemical composition of the diamond wire used in this comparative example, by weight percentage, includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

[0123] The comparative example of the diamond wire heat treatment process includes the following steps:

[0124] (1) The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm;

[0125] (2) The diamond wire obtained from the first drawing is subjected to the first austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at 1020℃ for 44s. Then, it is isothermal quenching is performed with water-mixed quenching liquid at 90℃.

[0126] (3) The obtained diamond wire is drawn a second time to obtain a diamond wire with a diameter of 0.73 mm;

[0127] (4) The diamond wire obtained from the second drawing is subjected to a second austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 26s. Then, it is isothermal quenched with water-mixed quenching liquid at 90℃.

[0128] (5) The obtained diamond wire is drawn for the third time to obtain a diamond wire with a diameter of 0.46 mm;

[0129] (6) The diamond wire obtained from the third drawing is subjected to a third austenitizing heat treatment. The diamond wire is placed in a muffle furnace and kept at a uniform temperature of 1020℃ for 22s, and then air-cooled to room temperature.

[0130] The water-mixed quenching fluid used in this comparative example contains 10% PAG quenching fluid by volume. PAG quenching fluid is a water-soluble quenching fluid made of high molecular weight polymers, and its main component is poly(ethylene glycol) polymer.

[0131] The average tensile strength of the diamond wire after low-temperature annealing in this comparative example was 1412 MPa and the average reduction of area was 40.6% after five tensile tests.

[0132] Compared to existing processes, the diamond wire produced by the low-temperature annealing process of this invention has both higher strength and ductility.

[0133] The microstructures of the diamond wire after the third drawing in low-temperature Example 1, the diamond wire after low-temperature annealing in Example 1, and the diamond wire after the third austenitizing heat treatment in Comparative Example 1 were compared using scanning electron microscopy (SEM). Figure 1 , Figure 2 and Figure 3As shown, the microstructure was severely deformed after the third drawing. Compared to the process designed in this invention, the austenitizing process involved higher heating temperatures and longer holding times, resulting in recrystallization and the formation of pearlite with uniform lamellar spacing. Low-temperature annealing, with its lower heating temperature and shorter holding time, eliminates deformation resistance while retaining the deformed microstructure, achieving work hardening. This process maintains high strength while rapidly and effectively obtaining high plasticity, realizing the synergistic strengthening and toughening production of diamond wire.

Claims

1. A synergistic strengthening and toughening production process for diamond wire, characterized in that, The wire rod is first drawn to obtain a diamond wire with a diameter of 2.30 mm. The diamond wire obtained from the first drawing undergoes a first austenitizing heat treatment at 1020 ℃ for 44 s, followed by isothermal quenching. A second drawing yields a diamond wire with a diameter of 0.73 mm. This second drawing undergoes a second austenitizing heat treatment at 1020 ℃ for 26 s, followed by isothermal quenching. A third drawing yields a diamond wire with a diameter of 0.46 mm. The diamond wire obtained from the third drawing undergoes low-temperature annealing and is then air-cooled to room temperature. The low-temperature annealing temperature is 520~620 ℃, and the holding time is 10 s or 20 s. The isothermal quenching conditions are all 90°C. The water-mixed quenching fluid contains a water-soluble quenching fluid of high molecular weight polymer with a volume percentage of 6-13%; the chemical composition of the diamond wire by weight percentage includes: C: 0.92%, Si: 0.17%, Mn: 0.32%, P: 0.0013%, S: 0.007%, Cr: 0.198%, Ni: 0.012%, with the remainder being Fe and unavoidable impurities.

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