A highly wear-resistant and impact-resistant chain accessory steel and its preparation method

Abstract

The present invention relates to the field of steel technology and proposes a highly wear-resistant and impact-resistant chain accessory steel and a method for preparing the same. The chain accessory steel comprises a matrix and a reinforcement phase. The matrix is ​​composed of the following components: C, Mn, V, Nb, Sr, W, Cu, Al, Dy, B, Co, Tb, P, and S, with the remainder being iron and its inevitable impurities. The reinforcement phase is MoC, and the mass ratio of the matrix to the reinforcement phase is 110:3-6. This technical solution solves the problem of poor wear resistance and impact resistance of chain accessory steel in related technologies.

Description

Technical Field

[0001] The present invention relates to the technical field of steel materials, and in particular to a highly wear-resistant and impact-resistant chain accessory steel and a preparation method thereof. Background Art

[0002] Chain component steel is used to manufacture chains and their various accessories. Chains play a key role in numerous mechanical devices and transmission systems, and the quality of their components directly impacts their performance and service life. These steels undergo specialized smelting, processing, and heat treatment processes to meet the strength, wear resistance, and impact resistance requirements of chains in diverse operating environments.

[0003] Chain components experience relative motion, such as between links, between pins and link holes, and between rollers and sprockets. These areas are prone to friction and wear. For example, in a bicycle chain, the links and rollers constantly rub against each other during meshing with the sprockets, necessitating excellent wear resistance for chain component steel. Furthermore, in some operating conditions, the chain may be subjected to sudden impact forces. For example, in a motorcycle transmission chain, the chain is subject to impact forces when the motorcycle accelerates, decelerates, or encounters bumpy roads. Chain component steel must be able to withstand these impacts without breaking, requiring excellent toughness and impact resistance. However, while current chain component steels have some wear and impact resistance, these properties are relatively limited. This performance may not meet the requirements of long-term use, particularly under harsh conditions such as heavy loads, high speeds, or significant impact loads.

[0004] Therefore, improving the wear resistance and impact resistance of chain accessory steel is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The present invention provides a highly wear-resistant and impact-resistant chain accessory steel and a preparation method thereof, which solves the problem of poor wear resistance and impact resistance of the chain accessory steel in the related art.

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention provides a highly wear-resistant and impact-resistant chain accessory steel, comprising a matrix and a reinforcement phase, wherein the matrix is ​​composed of the following components in the following mass percentages:

[0008] C 0.19%~0.24%, Mn 0.85%~1.25%, V 0.03%~0.1%, Nb 0.03%~0.05%, Sr 0.005%~0.035%, W 0.04%~0.085%, Cu 0.05%~0.09%, Al 0.09%~0.15%, Dy 0.005%~0.025%, B 0.002%~0.009%, Co 0.015%~0.33%, Tb 0.0018%~0.0092%, P≤0.012%, S≤0.009%, and the rest are iron and inevitable impurities; the reinforcing phase is MoC;

[0009] The mass ratio of the matrix to the reinforcement phase is 110:3-6.

[0010] As a further technical solution, the mass ratio of the sum of the mass percentages of Sr and Dy to the mass ratio of Co is 1:2-5.

[0011] When the mass percentage of the sum of Sr and Dy to the mass ratio of Co is 1:2~5, the wear resistance and impact resistance of the chain accessory steel can be further improved by adjusting the addition amount of the three.

[0012] As a further technical solution, the MoC is modified MoC, and the raw materials of the modified MoC include MoC, vanadium powder and boron powder.

[0013] The simultaneous modification of MoC with vanadium powder and boron powder can make the reinforcing phase better infiltrate into the matrix and improve the interface bonding with the matrix, thereby forming a denser and more stable chain accessory steel, thereby further improving the wear resistance and impact resistance of the chain accessory steel.

[0014] As a further technical solution, the mass ratio of the MoC, vanadium powder and boron powder is 80:2:1~4.

[0015] When the mass ratio of MoC, vanadium powder and boron powder is 80:2:1~4, the wear resistance and impact resistance of chain accessory steel can be further improved.

[0016] As a further technical solution, the preparation method of the modified MoC comprises the following steps: dry-mixing the MoC, the vanadium powder and the boron powder, press-molding, sintering and crushing to obtain the modified MoC.

[0017] As a further technical solution, during the dry mixing, the rotation speed is 100-200 rpm and the time is 9-13 hours; during the sintering, the temperature is 1500-1600° C. and the time is 3-4 hours.

[0018] The present invention also provides a method for preparing the highly wear-resistant and impact-resistant chain accessory steel, comprising the following steps:

[0019] S1. Weighing the components according to the mass percentage of the matrix, blending, and smelting to obtain molten steel;

[0020] S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories;

[0021] S3. Heat-treating the chain accessory steel billet to obtain the chain accessory steel.

[0022] As a further technical solution, in step S2, the median particle size of the reinforcing phase is 20-50 μm.

[0023] As a further technical solution, in step S3, the heat treatment is divided into a first stage heat treatment, a second stage heat treatment and a third stage heat treatment. During the first stage heat treatment, the temperature is raised to 1050~1150℃, the holding time is 0.5~1.5h, and then cooled to room temperature; during the second stage heat treatment, the temperature is raised to 650~800℃, the holding time is 1~2h, and then cooled to room temperature; during the third stage heat treatment, the temperature is raised to 400~480℃, the holding time is 2~3h, and then cooled to room temperature.

[0024] As a further technical solution, during the first stage heat treatment and the second stage heat treatment, the heating rate is independently 10-40°C / min; during the third stage heat treatment, the heating rate is 25-60°C / min.

[0025] As a further technical solution, the heating rates of the first stage heat treatment and the third stage heat treatment are independently greater than the heating rate of the third stage heat treatment.

[0026] When the heating rates of the first heat treatment and the third heat treatment are independently greater than the heating rate of the third heat treatment, the wear resistance and impact resistance of the chain accessory steel can be further improved.

[0027] The working principle and beneficial effects of the present invention are:

[0028] In the present invention, the chain accessory steel comprises a matrix and a reinforcement phase. Through the effective action of various elements in the matrix, combined with the reinforcement phase, a chain accessory steel with excellent wear resistance and impact resistance can be produced. The addition of Sr, Dy, and Co to the matrix, through their combined use, improves the microstructure of the chain accessory steel and refines the crystals, thereby forming a chain accessory steel with a stable and uniform internal structure, significantly enhancing the wear resistance and impact resistance of the chain accessory steel. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the following embodiments and comparative examples, the Mn content in the ferromanganese alloy is 75wt%; the V content in the vanadium-iron alloy is 50wt%; the Nb content in the niobium-iron alloy is 65wt%; the Sr content in the aluminum-strontium alloy is 30wt%; the W content in the tungsten-iron alloy is 80wt%; the copper content in the copper-iron alloy is 90wt%; the Al content in the aluminum ingot is 99.7wt%; the Tb content in the terbium-dysprosium-iron alloy is 26.6wt%, and the Dy content is 72.1wt%; the Dy content in the dysprosium-iron alloy is 85wt%; the Co content in the cobalt powder is 99.99wt%; and the Fe content in the scrap steel is 97.3wt%.

[0031] Example 1

[0032] A highly wear-resistant and impact-resistant chain accessory steel comprises a matrix and a reinforcement phase, wherein the matrix is ​​composed of the following components in the following mass percentages:

[0033] C 0.19%, Mn 0.85%, V 0.03%, Nb 0.03%, Sr 0.005%, W 0.04%, Cu 0.05%, Al 0.09%, Dy 0.005%, B 0.002%, Co 0.015%, Tb 0.0018%, P 0.004%, S 0.002%, the rest are iron and its inevitable impurities; the reinforcement phase is MoC;

[0034] The preparation method thereof comprises the following steps:

[0035] S1. According to the mass percentage of the matrix components, iron-manganese alloy, vanadium-iron alloy, niobium-iron alloy, aluminum-strontium alloy, tungsten-iron alloy, copper-iron alloy, aluminum ingot, terbium-dysprosium-iron alloy, dysprosium-iron alloy, cobalt powder, and scrap steel are weighed, mixed, and smelted to obtain molten steel;

[0036] S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories;

[0037] Among them, the reinforcement phase is MoC, and the mass ratio of matrix to reinforcement phase is 110:3;

[0038] S3. Heat the chain accessory steel billet to 1050°C at a heating rate of 10°C / min, keep it warm for 1.5 hours, and then cool it to room temperature; heat it to 650°C at a heating rate of 10°C / min, keep it warm for 2 hours, and then cool it to room temperature; heat it to 400°C at a heating rate of 25°C / min, keep it warm for 3 hours, and then cool it to room temperature to obtain chain accessory steel.

[0039] Example 2

[0040] A highly wear-resistant and impact-resistant chain accessory steel comprises a matrix and a reinforcement phase, wherein the matrix is ​​composed of the following components in the following mass percentages:

[0041] C 0.22%, Mn 1.1%, V 0.07%, Nb 0.04%, Sr 0.023%, W 0.06%, Cu 0.07%, Al 0.12%, Dy 0.023%, B 0.006%, Co 0.074%, Tb 0.0085%, P 0.008%, S 0.006%, the rest are iron and its inevitable impurities; the reinforcement phase is MoC;

[0042] The preparation method thereof comprises the following steps:

[0043] S1. According to the mass percentage of the matrix components, iron-manganese alloy, vanadium-iron alloy, niobium-iron alloy, aluminum-strontium alloy, tungsten-iron alloy, copper-iron alloy, aluminum ingot, terbium-dysprosium-iron alloy, dysprosium-iron alloy, cobalt powder, and scrap steel are weighed, mixed, and smelted to obtain molten steel;

[0044] S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories;

[0045] Among them, the reinforcement phase is MoC, and the mass ratio of matrix to reinforcement phase is 110:4.5;

[0046] S3. Heat the chain accessory steel billet to 1100°C at a heating rate of 30°C / min, keep it warm for 1 hour, and then cool it to room temperature; heat it to 750°C at a heating rate of 30°C / min, keep it warm for 1.5 hours, and then cool it to room temperature; heat it to 440°C at a heating rate of 30°C / min, keep it warm for 2.5 hours, and then cool it to room temperature to obtain chain accessory steel.

[0047] Example 3

[0048] A highly wear-resistant and impact-resistant chain accessory steel comprises a matrix and a reinforcement phase, wherein the matrix is ​​composed of the following components in the following mass percentages:

[0049] C 0.24%, Mn 1.25%, V 0.1%, Nb 0.05%, Sr 0.035%, W 0.085%, Cu 0.09%, Al 0.15%, Dy 0.025%, B 0.009%, Co 0.33%, Tb 0.0092%, P 0.012%, S 0.009%, the rest are iron and its inevitable impurities; the reinforcement phase is MoC;

[0050] The preparation method thereof comprises the following steps:

[0051] S1. According to the mass percentage of the matrix components, iron-manganese alloy, vanadium-iron alloy, niobium-iron alloy, aluminum-strontium alloy, tungsten-iron alloy, copper-iron alloy, aluminum ingot, terbium-dysprosium-iron alloy, dysprosium-iron alloy, cobalt powder, and scrap steel are weighed, mixed, and smelted to obtain molten steel;

[0052] S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories;

[0053] Among them, the reinforcement phase is MoC, and the mass ratio of matrix to reinforcement phase is 110:6;

[0054] S3. Heat the chain accessory steel billet to 1150°C at a heating rate of 40°C / min, keep it warm for 0.5h, and then cool it to room temperature; heat it to 800°C at a heating rate of 40°C / min, keep it warm for 1h, and then cool it to room temperature; heat it to 480°C at a heating rate of 60°C / min, keep it warm for 2h, and then cool it to room temperature to obtain chain accessory steel.

[0055] Example 4

[0056] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the mass percentage of Sr added is 0.006%, the mass percentage of Dy added is 0.006%, and the mass percentage of Co added is 0.108%.

[0057] Example 5

[0058] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the mass percentage of Sr added is 0.02%, the mass percentage of Dy added is 0.02%, and the mass percentage of Co added is 0.08%.

[0059] Example 6

[0060] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the mass percentage of Sr added is 0.01%, the mass percentage of Dy added is 0.01%, and the mass percentage of Co added is 0.1%.

[0061] Example 7

[0062] The only difference between this embodiment and Example 6 is that in this embodiment, MoC is modified MoC, and its preparation method includes the following steps: dry mixing 80 parts of MoC and 2.5 parts of vanadium powder at a rotation speed of 150 rpm for 12 hours, press-molding, sintering at 1550°C for 3.5 hours, and crushing to obtain modified MoC.

[0063] Example 8

[0064] The only difference between this embodiment and Example 6 is that in this embodiment, MoC is modified MoC, and its preparation method includes the following steps: dry mixing 80 parts of MoC and 2.5 parts of boron powder at a rotation speed of 150 rpm for 12 hours, press-molding, sintering at 1550°C for 3.5 hours, and crushing to obtain modified MoC.

[0065] Example 9

[0066] The only difference between this embodiment and Example 8 is that in this embodiment, MoC is modified MoC, and its preparation method includes the following steps: 80 parts of MoC, 2 parts of vanadium powder and 0.5 parts of boron powder are dry-mixed at a rotation speed of 150 rpm for 12 hours, press-molded, sintered at 1550°C for 3.5 hours, and crushed to obtain modified MoC.

[0067] Example 10

[0068] The only difference between this embodiment and embodiment 9 is that in this embodiment, 80 parts of MoC, 2 parts of vanadium powder, and 4.5 parts of boron powder are added.

[0069] Example 11

[0070] The only difference between this embodiment and embodiment 9 is that, in this embodiment, 80 parts of MoC, 2 parts of vanadium powder, and 1 part of boron powder are added.

[0071] Example 12

[0072] The only difference between this embodiment and embodiment 9 is that, in this embodiment, 80 parts of MoC, 2 parts of vanadium powder, and 4 parts of boron powder are added.

[0073] Example 13

[0074] The only difference between this embodiment and embodiment 12 is that, in this embodiment, the heating rate of the first stage heat treatment is 30°C / min, the heating rate of the second stage heat treatment is 10°C / min, and the heating rate of the third stage heat treatment is 25°C / min.

[0075] Example 14

[0076] The only difference between this embodiment and embodiment 12 is that, in this embodiment, the heating rate of the first stage heat treatment is 10°C / min, the heating rate of the second stage heat treatment is 30°C / min, and the heating rate of the third stage heat treatment is 25°C / min.

[0077] Example 15

[0078] The only difference between this embodiment and embodiment 12 is that, in this embodiment, the heating rates of the first and second heat treatments are both 30°C / min, and the heating rate of the third heat treatment is 25°C / min.

[0079] Comparative Example 1

[0080] The only difference between this comparative example and Example 1 is that in this comparative example, Dy is not added, the mass percentage of Sr added is 0.01%, and the mass percentage of Co added is 0.015%.

[0081] Comparative Example 2

[0082] The only difference between this comparative example and Example 1 is that in this comparative example, no Sr is added, the mass percentage of Dy added is 0.01%, and the mass percentage of Co added is 0.015%.

[0083] Comparative Example 3

[0084] The only difference between this comparative example and Example 1 is that in this comparative example, no Co is added, the mass percentage of Dy added is 0.0125%, and the mass percentage of Sr added is 0.0125%.

[0085] Comparative Example 4

[0086] The only difference between this comparative example and Example 1 is that in this comparative example, Dy and Sr are not added, and the mass percentage of Co added is 0.025%.

[0087] Comparative Example 5

[0088] The only difference between this comparative example and Example 1 is that in this comparative example, Dy, Sr and Co are not added.

[0089] The chain accessory steels prepared in Examples 1 to 15 and Comparative Examples 1 to 5 were subjected to the following performance tests:

[0090] ① Impact resistance test: According to the test method in GB / T 229-2020 "Charpy Pendulum Impact Test Method for Metallic Materials", the chain accessory steel sample is subjected to an impact energy test. The sample is a V-notch specimen, the test temperature is 23°C, and the result is rounded to one decimal place.

[0091] ② Wear resistance test: The chain accessory steel was prepared into 10mm×10mm×30mm steel specimens, and the wear tester (model: MLD-10) was used to test the wear of the specimens. During the test, the lower specimen was 40Cr, the rotation speed was 200r / min, the impact energy was 2J, the test time was 300min, and each cycle was 30min.

[0092] Measure the amount of wear and tear, and keep the result to three decimal places.

[0093] The test results are shown in Table 1 below:

[0094] Table 1 Performance test results of Examples 1 to 15 and Comparative Examples 1 to 5

[0095]

[0096] Compared with Comparative Examples 1 to 5, the impact energy of Example 1 is significantly increased and the wear amount is significantly reduced, indicating that when Sr, Dy and Co are added to the matrix of the chain accessory steel, the combined use of the three can improve the organizational structure of the chain accessory steel, refine the crystals, thereby forming a chain accessory steel with a stable and uniform internal structure, and significantly improving the wear resistance and impact resistance of the chain accessory steel.

[0097] Compared with Examples 2 and 4, the impact energy of Examples 5 to 6 is increased and the wear amount is reduced, indicating that when the mass ratio of the sum of the mass percentages of Sr and Dy to Co is 1:2 to 5, the wear resistance and impact resistance of the chain accessory steel can be further improved by adjusting the addition amounts of the three.

[0098] Compared with Examples 6 to 8, the impact energy of Example 9 is increased and the wear loss is reduced, indicating that the simultaneous modification of MoC with vanadium powder and boron powder can further improve the wear resistance and impact resistance of chain accessory steel.

[0099] Compared with Examples 9 and 10, the impact energy of Examples 11 and 12 is increased and the wear loss is reduced, indicating that when the mass ratio of MoC, vanadium powder and boron powder is 80:2:1-4, the wear resistance and impact resistance of the chain accessory steel can be further improved.

[0100] Compared with Examples 12 to 14, the impact energy of Example 15 is increased and the wear amount is reduced, indicating that when the heating rates of the first and third heat treatments are simultaneously greater than the heating rate of the third heat treatment, the wear resistance and impact resistance of the chain accessory steel can be further improved.

[0101] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly wear-resistant and impact-resistant chain accessory steel comprising a matrix and a reinforcement phase, characterized in that: The matrix is ​​composed of the following components in percentage by mass: C 0.19%~0.24%, Mn 0.85%~1.25%, V 0.03%~0.1%, Nb 0.03%~0.05%, Sr 0.005%~0.035%, W 0.04%~0.085%, Cu 0.05%~0.09%, Al 0.09%~0.15%, Dy 0.005%~0.025%, B 0.002%~0.009%, Co 0.015%~0.33%, Tb 0.0018%~0.0092%, P≤0.012%, S≤0.009%, and the rest are iron and inevitable impurities; the reinforcing phase is MoC; The mass ratio of the matrix to the reinforcement phase is 110:3-6; The method for preparing the highly wear-resistant and impact-resistant chain accessory steel comprises the following steps: S1. Weighing the components according to the mass percentage of the matrix, blending, and smelting to obtain molten steel; S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories; S3, heat treating the chain accessory steel billet to obtain the chain accessory steel; In step S3, the heat treatment is divided into a first heat treatment, a second heat treatment and a third heat treatment. During the first heat treatment, the temperature is raised to 1050-1150°C, the holding time is 0.5-1.5 hours, and then cooled to room temperature; during the second heat treatment, the temperature is raised to 650-800°C, the holding time is 1-2 hours, and then cooled to room temperature; during the third heat treatment, the temperature is raised to 400-480°C, the holding time is 2-3 hours, and then cooled to room temperature.

2. The highly wear-resistant and impact-resistant chain accessory steel according to claim 1, characterized in that: The mass ratio of the sum of the mass percentages of the Sr and Dy to the mass ratio of the Co is 1:2-5.

3. The highly wear-resistant and impact-resistant chain accessory steel according to claim 1, characterized in that: The MoC is modified MoC, and the raw materials of the modified MoC include MoC, vanadium powder and boron powder.

4. The highly wear-resistant and impact-resistant chain accessory steel according to claim 3, characterized in that: The mass ratio of the MoC, vanadium powder and boron powder is 80:2:1-4.

5. The highly wear-resistant and impact-resistant chain accessory steel according to claim 3, characterized in that: The preparation method of the modified MoC comprises the following steps: dry-mixing the MoC, the vanadium powder and the boron powder, press-forming, sintering and crushing to obtain the modified MoC.

6. The method for preparing a high wear-resistant and impact-resistant chain accessory steel according to any one of claims 1 to 5, wherein The characteristics include the following steps: S1. Weighing the components according to the mass percentage of the matrix, blending, and smelting to obtain molten steel; S2, refining the molten steel, adding a reinforcing phase, continuously casting, heating, and rolling to obtain a steel billet for chain accessories; S3. Heat-treating the chain accessory steel billet to obtain the chain accessory steel.

7. The method for preparing a highly wear-resistant and impact-resistant chain accessory steel according to claim 6, characterized in that: In step S2, the median particle size of the reinforcing phase is 20-50 μm.

8. The method for preparing a highly wear-resistant and impact-resistant chain accessory steel according to claim 1, characterized in that: During the first heat treatment and the second heat treatment, the heating rate is independently 10-40°C / min; during the third heat treatment, the heating rate is 25-60°C / min.

9. The method for preparing a highly wear-resistant and impact-resistant chain accessory steel according to claim 8, characterized in that: The heating rates of the first heat treatment and the second heat treatment are independently greater than the heating rate of the third heat treatment.

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