Preparation method of high manganese steel-based ceramic composite material

Abstract

The invention discloses a preparation method of a high-manganese steel-based ceramic composite material, which comprises the following steps: uniformly mixing composite powder, a binder and ceramic particles, shaping by using a grinding tool, and sintering to obtain a preform; the prefabricated body is fixed in a mold, and high manganese steel liquid is poured into the mold to obtain a blank; and carrying out solid solution, quenching and aging on the blank to obtain the high-manganese steel-based ceramic composite material. The composite powder is composed of nanometer B4C, Ni powder and nanometer TiC. The obtained high manganese steel-based ceramic composite material has good wear resistance and impact resistance.

Description

Technical Field

[0001] The invention relates to the technical field of alloys, and in particular to a method for preparing a high manganese steel-based ceramic composite material. Background Art

[0002] High manganese steel has excellent work hardening ability and is widely used in wear-resistant parts that are resistant to impact loads. However, it is found in production practice that high manganese steel is only wear-resistant under high impact, high stress, and hard abrasive conditions. For some castings working under low stress and low impact, it is difficult to give full play to its excellent work hardening ability, resulting in poor wear resistance of castings under low stress and low impact, which affects the service life of castings.

[0003] The wear resistance of high manganese steel can be improved by adding ceramic particles to high manganese steel. However, due to the low bonding strength between the high manganese steel matrix and the ceramic particles, the high manganese steel-based ceramic composite material will have poor impact resistance, be prone to cracks, and have poor wear resistance when impacted. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a method for preparing a high manganese steel-based ceramic composite material. The high manganese steel-based ceramic composite material obtained by the present invention has good wear resistance and impact resistance.

[0005] The invention provides a preparation method of a high manganese steel-based ceramic composite material, comprising the following steps: uniformly mixing composite powder, a binder and ceramic particles, shaping with a mold, and sintering to obtain a preform; fixing the preform in a mold, and casting high manganese steel liquid into the mold to obtain a blank; performing solid solution treatment, quenching, and aging on the blank to obtain the high manganese steel-based ceramic composite material; the composite powder consists of nano B4C, Ni powder and nano TiC.

[0006] Preferably, the weight ratio of nano B4C, Ni powder and nano TiC is 1:1-1.5:1-1.5.

[0007] Preferably, the weight ratio of ceramic particles, composite powder and binder is 84-86:10:4-6.

[0008] The binder may be polyvinyl alcohol or the like.

[0009] Preferably, the particle size of the ceramic particles is 2-4 mm.

[0010] Preferably, the volume of the preform accounts for 20-30% of the total volume of the blank.

[0011] Preferably, the raw materials of the high manganese steel liquid include, by weight percentage: C 0.7-0.8%, Mn 11-13%, Si0.4-0.6%, Mo 0.4-0.5%, Ni 0.2-0.3%, S<0.03%, P<0.03%, and the balance is Fe.

[0012] Preferably, the sintering is performed at 700-750° C. for 30-60 min.

[0013] Preferably, the casting temperature is 1400-1450°C.

[0014] Preferably, the solution procedure is: heating to 450-500°C and keeping warm for 1-1.5h, heating to 600-650°C and keeping warm for 1-1.5h, heating to 1100-1200°C and keeping warm for 1-1.5h.

[0015] Preferably, the aging temperature is 400-450°C, and the aging time is 60-72h.

[0016] The invention selects nano B4C, Ni powder and nano TiC to mix with ceramic particles in an appropriate proportion, and sintering at an appropriate temperature to obtain a preform, which can improve the bonding strength between nano B4C, Ni powder and nano TiC and ceramic particles; in addition, nano B4C, Ni powder and nano TiC are matched with each other in an appropriate proportion and the Mo and Ni contents in the high manganese steel liquid are adjusted, which can improve the wettability of the ceramic particles and the high manganese steel liquid, and by adjusting the solid solution procedure and aging parameters, the nano B4C, Ni powder and nano TiC are diffused into the high manganese steel matrix to form Fe2B, (Ti, Mo) C and other solid solution phases, and the interface between the ceramic particles and the high manganese steel matrix is ​​in a state of mutual diffusion and bite, thereby improving the bonding force between the two, thereby greatly improving the impact resistance and wear resistance of the high manganese steel-based ceramic composite material. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below through specific embodiments.

[0018] Example 1

[0019] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0020] Take ceramic particles with a particle size of 2-4 mm, clean and remove oil stains, and dry them for later use;

[0021] Nano-B4C, Ni powder and nano-TiC are mixed in a weight ratio of 1:1:1.5 to form a composite powder, and a binder polyvinyl alcohol, water and ceramic particles are added to mix so that the weight ratio of ceramic particles, composite powder and binder is 84:10:6. The preform is shaped by a mold and sintered at 700°C for 60 minutes to obtain a honeycomb preform.

[0022] The preform is fixed in a mold, and then high manganese steel liquid is cast into the mold at 1450° C. to obtain a blank; the raw materials of the high manganese steel liquid include, by weight percentage, C 0.7%, Mn 13%, Si 0.4%, Mo 0.5%, Ni 0.2%, S < 0.03%, P < 0.03%, and the balance is Fe; the volume of the preform accounts for 20% of the total volume of the blank;

[0023] The blank was heated to 500°C and kept for 1 hour, then heated to 650°C and kept for 1 hour, then heated to 1200°C and kept for 1 hour, then quenched with water to room temperature, then heated to 450°C and kept for aging for 60 hours, and then cooled to room temperature to obtain a high manganese steel-based ceramic composite material.

[0024] Example 2

[0025] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0026] Take ceramic particles with a particle size of 2-4 mm, clean and remove oil stains, and dry them for later use;

[0027] Nano-B4C, Ni powder and nano-TiC are mixed in a weight ratio of 1:1.5:1 to form a composite powder, and a binder polyvinyl alcohol, water and ceramic particles are added to mix so that the weight ratio of ceramic particles, composite powder and binder is 86:10:4. The preform is shaped by a mold and sintered at 750°C for 30 minutes to obtain a honeycomb preform.

[0028] The preform is fixed in a mold, and then high manganese steel liquid is cast into the mold at 1400° C. to obtain a blank; the raw materials of the high manganese steel liquid include, by weight percentage, C 0.8%, Mn 11%, Si 0.6%, Mo 0.4%, Ni 0.3%, S < 0.03%, P < 0.03%, and the balance is Fe; the volume of the preform accounts for 30% of the total volume of the blank;

[0029] The blank was heated to 450°C and kept for 1.5 h, then heated to 600°C and kept for 1.5 h, then heated to 1100°C and kept for 1.5 h, then quenched with water to room temperature, then heated to 400°C and kept for aging for 72 h, and cooled to room temperature with the furnace to obtain a high manganese steel-based ceramic composite material.

[0030] Example 3

[0031] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0032] Take ceramic particles with a particle size of 2-4 mm, clean and remove oil stains, and dry them for later use;

[0033] Nano-B4C, Ni powder and nano-TiC are mixed in a weight ratio of 1:1.2:1.2 to form a composite powder, and a binder polyvinyl alcohol, water and ceramic particles are added to mix so that the weight ratio of ceramic particles, composite powder and binder is 85:10:5; a mold is used to shape the preform, and the preform is sintered at 750°C for 60 minutes to obtain a honeycomb preform;

[0034] The preform is fixed in a mold, and then high manganese steel liquid is cast into the mold at 1430° C. to obtain a blank; the raw materials of the high manganese steel liquid include, by weight percentage, C 0.75%, Mn 12%, Si 0.5%, Mo 0.45%, Ni 0.25%, S < 0.03%, P < 0.03%, and the balance is Fe; the volume of the preform accounts for 25% of the total volume of the blank;

[0035] The blank was heated to 425°C and kept for 1.5 h, then heated to 625°C and kept for 1.5 h, then heated to 1150°C and kept for 1 h, then quenched with water to room temperature, then heated to 420°C and kept for aging for 72 h, and then cooled to room temperature to obtain a high manganese steel-based ceramic composite material.

[0036] Comparative Example 1

[0037] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0038] The composite powder is not used, and the other steps are the same as those in Example 3.

[0039] Comparative Example 2

[0040] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0041] The composite powder is composed of nano B4C and Ni powder in a weight ratio of 1:1.2, and the rest is the same as in Example 3.

[0042] Comparative Example 3

[0043] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0044] The composite powder is composed of nano B4C and nano TiC in a weight ratio of 1:1.2, and the rest is the same as in Example 3.

[0045] Comparative Example 4

[0046] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0047] The composite powder is composed of Ni powder and nano-TiC in a weight ratio of 1.2:1.2, and the rest is the same as in Example 3.

[0048] Comparative Example 5

[0049] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0050] The high manganese steel liquid does not contain Mo, and the rest is the same as in Example 3.

[0051] Comparative Example 6

[0052] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0053] The high manganese steel liquid does not contain Ni, and the rest is the same as in Example 3.

[0054] Comparative Example 7

[0055] A method for preparing a high manganese steel-based ceramic composite material comprises the following steps:

[0056] The blank was heated to 1150° C. and kept at this temperature for 1 hour, and then quenched with water to room temperature. The rest was the same as in Example 3.

[0057] The high manganese steel-based ceramic composite materials prepared in Examples 1-3 and Comparative Examples 1-7 were tested for performance, and the results are shown in Table 1.

[0058] Table 1 Test results

[0059]

[0060] It can be seen from Table 1 that the high manganese steel-based ceramic composite material prepared by the method of the present invention has good wear resistance under both high impact energy and low impact energy.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a high manganese steel-based ceramic composite material, characterized in that: The method comprises the following steps: uniformly mixing composite powder, binder and ceramic particles, shaping with a mold, and sintering to obtain a preform; fixing the preform in a mold, and casting high manganese steel liquid into the mold to obtain a blank; performing solid solution treatment, quenching and aging on the blank to obtain a high manganese steel-based ceramic composite material; the composite powder consists of nano B4C, Ni powder and nano TiC.

2. The method for preparing the high manganese steel-based ceramic composite material according to claim 1, characterized in that: The weight ratio of nano B4C, Ni powder and nano TiC is 1:1-1.5:1-1.

5.

3. The method for preparing the high manganese steel-based ceramic composite material according to claim 1 or 2, characterized in that: The weight ratio of ceramic particles, composite powder and binder is 84-86:10:4-6.

4. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 3, characterized in that: The particle size of the ceramic particles is 2-4 mm.

5. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 4, characterized in that: The volume of the preform accounts for 20-30% of the total volume of the blank.

6. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 5, characterized in that: The raw materials of high manganese steel liquid include, by weight percentage: C 0.7-0.8%, Mn 11-13%, Si0.4-0.6%, Mo 0.4-0.5%, Ni0.2-0.3%, S<0.03%, P<0.03%, and the balance is Fe.

7. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 6, characterized in that: Sinter at 700-750℃ for 30-60min.

8. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 7, characterized in that: The casting temperature is 1400-1450℃.

9. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 8, characterized in that: The solution procedure is: heat to 450-500℃ and keep warm for 1-1.5h, heat to 600-650℃ and keep warm for 1-1.5h, heat to 1100-1200℃ and keep warm for 1-1.5h.

10. The method for preparing the high manganese steel-based ceramic composite material according to any one of claims 1 to 9, characterized in that: The aging temperature is 400-450℃, and the aging time is 60-72h.

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