High-hardness compression-resistant alloy steel plate and preparation process thereof

Abstract

The invention discloses a high-hardness compression-resistant alloy steel plate and a preparation process thereof, and relates to the technical field of metal material coatings. The preparation technology of the high-hardness compression-resistant alloy steel plate comprises the following steps that S1, cleaning pretreatment and spraying pretreatment are conducted on an alloy steel plate, and a pretreated alloy steel plate II is obtained; s2, a Ti-22Al-25Nb metal layer is deposited on the surface of the pretreated alloy steel plate II through a high-energy micro-arc alloying technology, and a plated alloy steel plate I is obtained; s3, spraying a high-hardness metal spraying material on the surface of the coating alloy steel plate I by adopting a high velocity oxy-fuel spraying technology to obtain a spraying layer; carrying out heat treatment to obtain a plated alloy steel plate II; and S4, nitriding treatment is conducted on the plated alloy steel plate II, and the high-hardness compression-resistant alloy steel plate is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material plating, and specifically to a high-hardness and compression-resistant alloy steel plate and its preparation process. Background Art

[0002] With the vigorous development of China's science and technology and industry, alloy steel plates have been widely used. In order to meet the needs of different production environments, it is necessary to research and produce various types of alloy steel plates with different properties, such as high strength, high temperature resistance, high pressure resistance, low temperature resistance, corrosion resistance, wear resistance, etc. In fields such as aerospace and automobile manufacturing, when mechanical products are slightly bumped during use, they are prone to dent damage, which will undoubtedly cause huge economic losses. In order to improve the service life of mechanical products as much as possible and improve economic benefits, the hardness and compression resistance of alloy steel plates can be improved.

[0003] Therefore, it is of great significance to develop a high-hardness and compression-resistant alloy steel plate. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-hardness and compression-resistant alloy steel plate and its preparation process to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A preparation process of a high-hardness and compression-resistant alloy steel plate, comprising the following steps:

[0007] S1: Pretreat the alloy steel plate;

[0008] S11: Immerse the alloy steel plate in an acidic cleaning solution, soak it at 30 - 35 °C for 2 - 15 min, take it out, rinse it with clean water 2 - 3 times, and dry it to complete the cleaning pretreatment, obtaining the pretreated alloy steel plate I;

[0009] S12: Spray-pretreat the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II;

[0010] S2: Deposit a Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by a high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0011] S3: Spray a high-hardness metal spray coating on the surface of the plated alloy steel plate I by a supersonic flame spraying technique to obtain a sprayed coating; after heat treatment, obtain the plated alloy steel plate II;

[0012] S4: Perform nitriding treatment on the plated alloy steel plate II to obtain a high-hardness and compression-resistant alloy steel plate.

[0013] Further, the acidic cleaning solution is prepared by mixing PT-ROClean111 acidic cleaner, KZD-1012 acidic degreaser, and deionized water in a mass ratio of (1 to 1.5):(0.5 to 1):100.

[0014] Further, the PT-ROClean111 acidic cleaner is purchased from Ruinequan Environmental Protection Technology (Dalian) Co., Ltd.; the KZD-1012 acidic degreaser is purchased from Guangzhou Kaizhida Chemical Co., Ltd.

[0015] Further, the surface roughness of the pretreated alloy steel plate is Ra = 2 to 5 μm.

[0016] Further, the process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 10 to 20 L / min; the voltage is 40 to 120 V, the frequency is 200 to 600 Hz, and the power is 400 to 1600 W.

[0017] Further, the thickness of the Ti-22Al-25Nb metal layer is 25 to 50 μm.

[0018] Further, the process parameters of the supersonic flame spraying technology are as follows: the oxygen pressure is 1.2 to 1.6 MPa, the oxygen flow rate is 1 to 1.5 L / min; the propane pressure is 0.2 to 0.6 MPa, the propane flow rate is 100 to 150 L / min; the nitrogen powder feeding pressure is 0.4 to 0.6 MPa, and the spraying distance is 150 to 200 mm.

[0019] Further, the thickness of the sprayed coating is 0.4 to 0.6 mm.

[0020] Further, the high-hardness metal spraying coating is obtained by mixing the following components: by mass percentage, 10 to 20% of Ti, 1 to 2% of Ti@TaC whiskers, and the rest is Ti-22Al-25Nb.

[0021] Further, the particle sizes of Ti and Ti-22Al-25Nb in the high-hardness metal spraying coating are 10 to 20 μm.

[0022] Further, the preparation method of the Ti@TaC whiskers is as follows: (1) Add Ti to a 2 to 5 wt% polyvinyl alcohol solution, soak for 2 to 4 h, and obtain modified Ti through suction filtration and drying; (2) Add TaC whiskers to deionized water, ultrasonically disperse for 1 to 2 h to obtain a TaC whisker suspension; (3) Add the modified Ti to the TaC whisker suspension, ultrasonically treat for 2 to 4 h, and obtain Ti@TaC whiskers through suction filtration and drying.

[0023] Furthermore, the mass ratio of Ti to polyvinyl alcohol is 1:(0.06 - 0.15).

[0024] Furthermore, the length of the TaC whiskers is 20 - 100 μm, and the tube diameter is 0.5 - 1 μm.

[0025] Furthermore, the mass ratio of the modified Ti to the TaC whiskers is 1:(0.05 - 0.2).

[0026] Furthermore, the process parameters of the heat treatment are as follows: introducing a mixed gas of Ar and O2 with a volume ratio of (70 - 95):(5 - 30); the temperature is 650 - 750 °C; the time is 2 - 8 h.

[0027] Furthermore, the process parameters of the nitriding treatment are as follows: the nitriding temperature is 650 - 700 °C; the nitriding voltage is 500 - 650 V; the nitriding pressure is 200 - 400 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 with a volume ratio of 1:3:1, the gas flow rate is 0.5 - 1 L / min; the nitriding depth is 0.1 - 0.3 mm.

[0028] The present invention performs two-step pretreatment on the alloy steel plate in sequence, namely, cleaning pretreatment and spraying pretreatment; among them, the cleaning pretreatment is carried out with an acidic cleaning solution, and its main function is to remove the residual oil and uneven oxide film on the surface of the alloy steel plate to obtain a clean pretreatment alloy steel plate I; the spraying pretreatment is carried out with liquid carbon dioxide, and its main function is to further clean the pretreatment alloy steel plate I to avoid the residual acidic solution, and at the same time, it can also increase the surface roughness of the alloy steel plate without changing the thickness of the alloy steel plate and without causing obvious damage. That is, the final pretreatment alloy steel plate obtained in the present invention is clean and has a certain roughness.

[0029] In the present invention, a high-hardness metal layer is designed on the alloy steel plate. Considering that if the bonding force between the metal layer and the substrate is insufficient, the effective enhancement of the hardness and compressive resistance of the alloy steel plate cannot be achieved. Therefore, in addition to the pretreatment of the alloy steel plate, a Ti-22Al-25Nb metal layer is further deposited on the pretreated alloy steel plate. Compared with the ordinary Ti metal layer, this metal layer can generate a better bonding strength with the alloy steel plate. The Ti-22Al-25Nb metal layer mainly plays an intermediate bridging role and can form an effective and strong bond with the spray coating in the follow-up to further consolidate and enhance the hardness and compressive resistance of the alloy steel. In the present invention, the process parameters of the high-energy micro-arc oxidation process can also be controlled to avoid defects in the structure of the Ti-22Al-25Nb metal layer and form a more dense nanocrystalline structure inside it, which can also further enhance the bonding force with the alloy steel plate.

[0030] In the present invention, the high-hardness metal spraying coating is further sprayed on the Ti-22Al-25Nb metal layer by using the high-velocity oxy-fuel spraying technology. An appropriate amount of Ti and Ti@TaC whiskers are incorporated into the high-hardness metal spraying coating. The role of Ti is to enhance the bonding strength between the spraying coating and the Ti-22Al-25Nb metal layer; the Ti@TaC whiskers can make up for the strength and at the same time improve the wear resistance of the spraying coating. Compared with completely spraying Ti-22Al-25Nb, the creep resistance of this spraying coating is better and it is more suitable for the actual application needs. In order to further enhance the hardness of the alloy plate, nitriding treatment of the alloy steel plate is also considered in the present invention. Based on this, when heat treating the plated alloy steel plate II in the present invention, different from the conventional inert gas protection or vacuum heat treatment, partial oxygen is introduced during the heat treatment process in the present invention. The introduction of oxygen can form a porous oxide film on the surface of the spraying coating during the heat treatment process, which can serve as a diffusion channel for nitrogen and improve the nitriding efficiency, playing an extremely important promoting role in the subsequent nitriding treatment. However, if the porous oxide film is too dense, it will inhibit the diffusion of nitrogen. Based on this, in the present invention, the porosity and thickness of the porous oxide film can be further controlled by controlling the oxygen concentration and the heat treatment duration, so as to achieve the purpose of controlling the subsequent nitriding efficiency and quality.

[0031] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0032] (1) The present invention uses liquid carbon dioxide to spray and pre-treat the pre-treated alloy steel plate I. Without changing the thickness of the alloy itself and causing obvious damage, it not only completes the secondary cleaning of the pre-treated alloy steel plate I, but also increases the surface roughness of the pre-treated alloy steel plate I, laying a foundation for the subsequent strong bonding between the Ti-22Al-25Nb metal layer and the alloy steel plate;

[0033] (2) The present invention provides a layer of Ti-22Al-25Nb metal layer on the pre-treated alloy steel plate II, which plays an intermediate bridging role and can form a strong bond with both the alloy steel plate and the spraying coating, playing a role in ensuring the high hardness and compressive resistance of the alloy steel plate;

[0034] (3) In the present invention, Ti and Ti@TaC whiskers are introduced into the high-hardness metal spraying coating. The role of Ti is to enhance the bonding strength between the spraying coating and the Ti-22Al-25Nb metal layer; the Ti@TaC whiskers can make up for the strength and at the same time improve the wear resistance of the spraying coating. Compared with completely spraying Ti-22Al-25Nb, the creep resistance of this spraying coating is better and it is more suitable for the actual application needs;

[0035] (4) When the coated alloy steel plate II is heat treated in the present invention, an appropriate amount of oxygen is introduced, and the porosity and thickness of the porous oxide film on the surface of the coated alloy steel plate II are controlled by controlling the oxygen concentration, thereby finally achieving control of the nitriding efficiency and quality;

[0036] (5) The present invention further improves the hardness and compression resistance of the alloy steel plate by nitriding the coated alloy steel plate II.

[0037] In summary, the present invention comprehensively prepares a high-hardness compression-resistant alloy steel plate through alloy steel plate pretreatment, deposition of Ti-22Al-25Nb metal layer, spraying of spray layer, and nitriding treatment. The high-hardness compression-resistant alloy steel plate is more adaptable to the needs and applications in aerospace, automobile manufacturing and other fields, and is of great significance. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that the following parts are calculated by weight, and the purchasers of all raw materials involved in the present invention include, without any special restrictions, illustratively:

[0040] In the following examples, alloy steel plates, grade: 42CrMo, were purchased from Jiangsu Lichang Metal Products Co., Ltd.;

[0041] PT-ROClean111 acidic cleaner, purchased from Ruinequan Environmental Protection Technology (Dalian) Co., Ltd.;

[0042] KZD-1012 acidic degreasing agent, purchased from Guangzhou Kaizhida Chemical Co., Ltd.;

[0043] Ti-22Al-25Nb rods, 4 mm in diameter, and Ti rods, 4 mm in diameter, were purchased from Baoji Litai Nonferrous Metals Co., Ltd.;

[0044] TaC whiskers, with a length of 20 to 100 μm and a diameter of 0.5 to 1 μm, were purchased from Shanghai Yunfu Nanotechnology Co., Ltd.;

[0045] The rest were purchased from the market.

[0046] Preliminary preparation: Preparation of Ti@TaC whiskers: (1) Add Ti to an aqueous solution of 4 wt% polyvinyl alcohol (where the mass ratio of Ti to polyvinyl alcohol is 1:0.12), soak for 3 h, filter by suction and dry to obtain modified Ti; (2) Add TaC whiskers to deionized water and ultrasonically disperse for 1.5 h to obtain a TaC whisker suspension; (3) Add modified Ti to the TaC whisker suspension (where the mass ratio of modified Ti to TaC whiskers is 1:0.1), ultrasonically treat for 3 h, filter by suction and dry to obtain Ti@TaC whiskers.

[0047] Example 1: A preparation process for a high-hardness and compressive alloy steel plate:

[0048] S1: Pretreat the 42CrMo alloy steel plate;

[0049] S11: Immerse a 42CrMo alloy steel plate of 70 mm × 30 mm × 12 mm in an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soak at 32 °C for 8 min, take out, rinse 3 times with clean water, and dry to complete the cleaning pretreatment to obtain pretreated alloy steel plate I;

[0050] S12: Spray-pretreat pretreated alloy steel plate I with liquid carbon dioxide to obtain pretreated alloy steel plate II with a surface roughness of 4 μm;

[0051] S2: Deposit a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of pretreated alloy steel plate II by high-energy micro-arc alloying process to obtain coated alloy steel plate I;

[0052] Among them, the process parameters of the high-energy micro-arc alloying process are: the electroplating anode is a Ti-22Al-25Nb rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar with a flow rate of 15 L / min; the voltage is 80 V, the frequency is 400 Hz, and the power is 800 W;

[0053] S3: Spray a high-hardness metal spray coating on the surface of coated alloy steel plate I by supersonic flame spraying technology to obtain a 0.5-mm-thick spray coating; after heat treatment, obtain coated alloy steel plate II;

[0054] Among them, the high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, Ti is 17%, Ti@TaC whiskers are 1.5%, and the rest is Ti-22Al-25Nb;

[0055] The process parameters of the supersonic flame spraying technology are as follows: the oxygen pressure is 1.4 MPa, and the oxygen flow rate is 1.2 L / min; the propane pressure is 0.4 MPa, and the propane flow rate is 120 L / min; the nitrogen powder feeding pressure is 0.5 MPa, and the spraying distance is 175 mm;

[0056] The process parameters of the heat treatment are as follows: introducing a mixed gas of Ar and O2 mixed in a volume ratio of 82:18; the temperature is 700 °C; the time is 6 h;

[0057] S4: Perform nitriding treatment on the plated alloy steel plate II to obtain a high-hardness compressive alloy steel plate;

[0058] Among them, the process parameters of the nitriding treatment are as follows: the nitriding temperature is 675 °C; the nitriding voltage is 550 V; the nitriding pressure is 300 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, and the gas flow rate is 0.8 L / min; the nitriding depth is 0.2 mm.

[0059] Example 2: A preparation process of a high-hardness compressive alloy steel plate:

[0060] S1: Pretreat the 42CrMo alloy steel plate;

[0061] S11: Immerse a 42CrMo alloy steel plate of 70 mm×30 mm×12 mm into an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1:0.5:100), soak at 32 °C for 2 min, take out, rinse with clear water 2 times, and dry to complete the cleaning pretreatment to obtain the pretreated alloy steel plate I;

[0062] S12: Perform jet pretreatment on the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II with a surface roughness of 2 μm;

[0063] S2: Deposit a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by using the high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0064] Among them, the process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 15 L / min; the voltage is 40 V, the frequency is 200 Hz, and the power is 400 W;

[0065] S3: Spray a high-hardness metal spray coating on the surface of the plated alloy steel plate I by using the supersonic flame spraying technology to obtain a 0.5-mm-thick spray coating; after heat treatment, obtain the plated alloy steel plate II;

[0066] Among them, the high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, Ti is 10%, Ti@TaC whiskers are 1%, and the rest is Ti-22Al-25Nb;

[0067] The process parameters of the supersonic flame spraying technology are: oxygen pressure is 1.2 MPa, oxygen flow rate is 1 L / min; propane pressure is 0.2 MPa, propane flow rate is 100 L / min; nitrogen powder feeding pressure is 0.4 MPa, spraying distance is 150 mm;

[0068] The process parameters of the heat treatment are: introducing a mixed gas of Ar and O2 mixed in a volume ratio of 95:5; temperature is 650 °C; time is 2 h;

[0069] S4: Perform nitriding treatment on the plated alloy steel plate II to obtain a high-hardness and compressive alloy steel plate;

[0070] Among them, the process parameters of the nitriding treatment are: nitriding temperature is 650 °C; nitriding voltage is 500 V; nitriding pressure is 200 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, and the gas flow rate is 0.5 L / min; nitriding depth is 0.2 mm.

[0071] Example 3: A preparation process of a high-hardness and compressive alloy steel plate:

[0072] S1: Pretreat the 42CrMo alloy steel plate;

[0073] S11: Immerse the 42CrMo alloy steel plate with dimensions of 70 mm × 30 mm × 12 mm into an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.5:1:100), soak it at 32 °C for 15 min, take it out, rinse it with clear water 3 times, and dry it to complete the cleaning pretreatment to obtain the pretreated alloy steel plate I;

[0074] S12: Perform jet pretreatment on the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II with a surface roughness of 5 μm;

[0075] S2: Deposit a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by using the high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0076] Among them, the process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb rod; the electroplating cathode is a pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 20 L / min; the voltage is 120 V, the frequency is 600 Hz, and the power is 1600 W;

[0077] S3: Use the high-velocity oxy-fuel spraying technology to spray a high-hardness metal spraying coating on the surface of the plated alloy steel plate I to obtain a sprayed coating with a thickness of 0.5 mm; after heat treatment, the plated alloy steel plate II is obtained;

[0078] Among them, the high-hardness metal spraying coating is obtained by mixing the following components: by mass percentage, Ti is 20%, Ti@TaC whiskers are 2%, and the rest is Ti-22Al-25Nb;

[0079] The process parameters of the high-velocity oxy-fuel spraying technology are as follows: the oxygen pressure is 1.6 MPa, and the oxygen flow rate is 1.5 L / min; the propane pressure is 0.6 MPa, and the propane flow rate is 150 L / min; the nitrogen powder feeding pressure is 0.6 MPa, and the spraying distance is 200 mm;

[0080] The process parameters of the heat treatment are as follows: introduce a mixed gas of Ar and O2 mixed in a volume ratio of 70:30; the temperature is 750 °C; the time is 8 h;

[0081] S4: Perform nitriding treatment on the plated alloy steel plate II to obtain a high-hardness and compressive alloy steel plate;

[0082] Among them, the process parameters of the nitriding treatment are as follows: the nitriding temperature is 700 °C; the nitriding voltage is 650 V; the nitriding pressure is 400 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, and the gas flow rate is 1 L / min; the nitriding depth is 0.2 mm.

[0083] The following is based on Example 1 to set up a control experiment, specifically Comparative Examples 1-5:

[0084] Comparative Example 1: Comparative Example 1 is based on Example 1 and adjusted as follows: do not use liquid carbon dioxide to spray and treat the pretreated alloy steel plate I, and other processes remain unchanged. Specifically:

[0085] A preparation process of a high-hardness and compressive alloy steel plate:

[0086] S1: Pretreat the 42CrMo alloy steel plate;

[0087] S11: Immerse a 42CrMo alloy steel plate with dimensions of 70mm×30mm×12mm into an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soak it at 32°C for 8 minutes, take it out, rinse it 3 times with clean water, and dry it to complete the cleaning pretreatment, obtaining the pretreated alloy steel plate I;

[0088] S2: Deposit a 35μm thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate I by using the high-energy micro-arc alloying process to obtain the coated alloy steel plate I;

[0089] Among them, the process parameters of the high-energy micro-arc alloying process are: the electroplating anode is a Ti-22Al-25Nb rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 15L / min; the voltage is 80V, the frequency is 400Hz, and the power is 800W;

[0090] S3: Spray a high-hardness metal spray coating on the surface of the coated alloy steel plate I by using the supersonic flame spraying technology to obtain a 0.5mm thick sprayed coating; after heat treatment, obtain the coated alloy steel plate II;

[0091] Among them, the high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, Ti is 17%, Ti@TaC whiskers are 1.5%, and the rest is Ti-22Al-25Nb;

[0092] The process parameters of the supersonic flame spraying technology are: the oxygen pressure is 1.4MPa, and the oxygen flow rate is 1.2L / min; the propane pressure is 0.4MPa, and the propane flow rate is 120L / min; the nitrogen powder feeding pressure is 0.5MPa, and the spraying distance is 175mm;

[0093] The process parameters of the heat treatment are: introduce a mixed gas of Ar and O2 mixed in a volume ratio of 82:18; the temperature is 700°C; the time is 6h;

[0094] S4: Perform nitriding treatment on the coated alloy steel plate II to obtain a high-hardness and compressive alloy steel plate;

[0095] Among them, the process parameters of the nitriding treatment are: the nitriding temperature is 675°C; the nitriding voltage is 550V; the nitriding pressure is 300Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, and the gas flow rate is 0.8L / min; the nitriding depth is 0.2mm.

[0096] Comparative Example 2: Comparative Example 2 is based on Example 1 and is adjusted as follows: A Ti metal layer is deposited on the surface of the pretreated alloy steel plate II, and other processes remain unchanged. Specifically:

[0097] A preparation process for a high-hardness and compressive alloy steel plate:

[0098] S1: Pretreat the 42CrMo alloy steel plate;

[0099] S11: Immerse a 42CrMo alloy steel plate with dimensions of 70mm×30mm×12mm in an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soak it at 32°C for 8 minutes, take it out, rinse it with clean water 3 times, and dry it to complete the cleaning pretreatment, obtaining the pretreated alloy steel plate I;

[0100] S12: Spray-pretreat the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II with a surface roughness of 4μm;

[0101] S2: Deposit a 35μm-thick Ti metal layer on the surface of the pretreated alloy steel plate II by using the high-energy micro-arc alloying process to obtain the coated alloy steel plate I;

[0102] Among them, the process parameters of the high-energy micro-arc alloying process are: the electroplating anode is a Ti rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 15L / min; the voltage is 80V, the frequency is 400Hz, and the power is 800W;

[0103] S3: Spray the high-hardness metal spray coating on the surface of the coated alloy steel plate I by using the supersonic flame spraying technology to obtain a 0.5mm-thick spray coating; after heat treatment, obtain the coated alloy steel plate II;

[0104] Among them, the high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, Ti is 17%, Ti@TaC whiskers are 1.5%, and the rest is Ti-22Al-25Nb;

[0105] The process parameters of the supersonic flame spraying technology are: the oxygen pressure is 1.4MPa, and the oxygen flow rate is 1.2L / min; the propane pressure is 0.4MPa, and the propane flow rate is 120L / min; the nitrogen powder feeding pressure is 0.5MPa, and the spraying distance is 175mm;

[0106] The process parameters of the heat treatment are: introducing a mixed gas of Ar and O2 mixed in a volume ratio of 82:18; the temperature is 700°C; the time is 6h;

[0107] S4: Nitriding treatment is carried out on the plated alloy steel plate II to obtain a high-hardness compressive alloy steel plate;

[0108] Among them, the process parameters of the nitriding treatment are: nitriding temperature is 675 °C; nitriding voltage is 550 V; nitriding pressure is 300 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 with a volume ratio of 1:3:1, and the gas flow rate is 0.8 L / min; the nitriding depth is 0.2 mm.

[0109] Comparative Example 3: Comparative Example 3 is based on Example 1, and the following is adjusted: Ti@TaC whiskers are not added to the high-hardness metal spray coating, and other processes remain unchanged. Specifically:

[0110] A preparation process of a high-hardness compressive alloy steel plate:

[0111] S1: Pretreat the 42CrMo alloy steel plate;

[0112] S11: Immerse a 42CrMo alloy steel plate of 70 mm×30 mm×12 mm into an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soak at 32 °C for 8 min, take out, rinse with clean water 3 times, dry, complete the cleaning pretreatment, and obtain the pretreated alloy steel plate I;

[0113] S12: Spray pretreatment is carried out on the pretreated alloy steel plate I with liquid carbon dioxide to obtain a pretreated alloy steel plate II with a surface roughness of 4 μm;

[0114] S2: Deposit a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0115] Among them, the process parameters of the high-energy micro-arc alloying process are: the electroplating anode is a Ti-22Al-25Nb titanium rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 15 L / min; the voltage is 80 V, the frequency is 400 Hz, and the power is 800 W;

[0116] S3: Spray the high-hardness metal spray coating on the surface of the plated alloy steel plate I by supersonic flame spraying technology to obtain a 0.5-mm-thick spray coating; after heat treatment, obtain the plated alloy steel plate II;

[0117] Among them, the high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, Ti is 17%, and Ti-22Al-25Nb is 83%;

[0118] The process parameters of the supersonic flame spraying technology are as follows: the oxygen pressure is 1.4 MPa, and the oxygen flow rate is 1.2 L / min; the propane pressure is 0.4 MPa, and the propane flow rate is 120 L / min; the nitrogen powder feeding pressure is 0.5 MPa, and the spraying distance is 175 mm;

[0119] The process parameters of the heat treatment are as follows: introducing a mixed gas of Ar and O2 with a volume ratio of 82:18; the temperature is 700 °C; the time is 6 h;

[0120] S4: Perform nitriding treatment on the plated alloy steel plate II to obtain a high-hardness compressive alloy steel plate;

[0121] Among them, the process parameters of the nitriding treatment are as follows: the nitriding temperature is 675 °C; the nitriding voltage is 550 V; the nitriding pressure is 300 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 with a volume ratio of 1:3:1, and the gas flow rate is 0.8 L / min; the nitriding depth is 0.2 mm.

[0122] Comparative Example 4: Comparative Example 4 is based on Example 1 and is adjusted as follows: after the spray coating is set, no heat treatment is performed, and other processes remain unchanged. Specifically:

[0123] A preparation process of a high-hardness compressive alloy steel plate:

[0124] S1: Pretreat the 42CrMo alloy steel plate;

[0125] S11: Immerse the 42CrMo alloy steel plate with dimensions of 70 mm × 30 mm × 12 mm in an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soak it at 32 °C for 8 min, take it out, rinse it with clean water 3 times, and dry it to complete the cleaning pretreatment to obtain the pretreated alloy steel plate I;

[0126] S12: Perform jet pretreatment on the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II with a surface roughness of 4 μm;

[0127] S2: Deposit a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0128] Among them, the process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb titanium rod; the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 15 L / min; the voltage is 80 V, the frequency is 400 Hz, and the power is 800 W;

[0129] S3: Spraying a high-hardness metal spraying coating on the surface of the plated alloy steel plate I by using the high-velocity oxy-fuel spraying technology to obtain a sprayed coating with a thickness of 0.5 mm, and obtaining the plated alloy steel plate II;

[0130] Among them, the high-hardness metal spraying coating is obtained by mixing the following components: by mass percentage, Ti is 17%, Ti@TaC whiskers are 1.5%, and the rest is Ti-22Al-25Nb;

[0131] The process parameters of the high-velocity oxy-fuel spraying technology are: the oxygen pressure is 1.4 MPa, the oxygen flow rate is 1.2 L / min; the propane pressure is 0.4 MPa, the propane flow rate is 120 L / min; the nitrogen powder feeding pressure is 0.5 MPa, and the spraying distance is 175 mm;

[0132] S4: Carrying out nitriding treatment on the plated alloy steel plate II to obtain a high-hardness and compressive alloy steel plate;

[0133] Among them, the process parameters of the nitriding treatment are: the nitriding temperature is 675 °C; the nitriding voltage is 550 V; the nitriding pressure is 300 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, the gas flow rate is 0.8 L / min; the nitriding depth is 0.2 mm.

[0134] Comparative example 5: Comparative example 5 is based on Example 1 and is adjusted as follows: no nitriding treatment is carried out, and other processes remain unchanged. Specifically:

[0135] A preparation process of a high-hardness and compressive alloy steel plate:

[0136] S1: Pretreating a 42CrMo alloy steel plate;

[0137] S11: Immersing a 42CrMo alloy steel plate with dimensions of 70 mm × 30 mm × 12 mm into an acidic cleaning solution (prepared by mixing PT-ROClean111 type acidic cleaner, KZD-1012 type acidic degreaser, and deionized water in a mass ratio of 1.25:0.75:100), soaking at 32 °C for 8 min, taking out, rinsing 3 times with clear water, and drying to complete the cleaning pretreatment to obtain the pretreated alloy steel plate I;

[0138] S12: Carrying out jet pretreatment on the pretreated alloy steel plate I with liquid carbon dioxide to obtain the pretreated alloy steel plate II with a surface roughness of 4 μm;

[0139] S2: Depositing a 35-μm-thick Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by using the high-energy micro-arc alloying process to obtain the plated alloy steel plate I;

[0140] Among them, the process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb titanium rod; the electroplating cathode is a pre-treated alloy steel plate; the protective gas is Ar, and its flow rate is 15 L / min; the voltage is 80 V, the frequency is 400 Hz, and the power is 800 W;

[0141] S3: Use the high-velocity oxy-fuel spraying technology to spray a high-hardness metal spraying coating on the surface of the plated alloy steel plate I to obtain a sprayed coating with a thickness of 0.5 mm; after heat treatment, a high-hardness compressive alloy steel plate is obtained;

[0142] Among them, the high-hardness metal spraying coating is obtained by mixing the following components: by mass percentage, Ti is 17%, Ti@TaC whiskers are 1.5%, and the rest is Ti-22Al-25Nb;

[0143] The process parameters of the high-velocity oxy-fuel spraying technology are as follows: the oxygen pressure is 1.4 MPa, and the oxygen flow rate is 1.2 L / min; the propane pressure is 0.4 MPa, and the propane flow rate is 120 L / min; the nitrogen powder feeding pressure is 0.5 MPa, and the spraying distance is 175 mm;

[0144] The process parameters of the heat treatment are as follows: introduce a mixed gas of Ar and O2 mixed in a volume ratio of 82:18; the temperature is 700 °C; the time is 6 h.

[0145] Performance test: Perform relevant performance tests on the high-hardness compressive alloy steel plates prepared in Examples 1 to 3 and Comparative Examples 1 to 5, specifically as follows:

[0146] (1) Hardness test: Use a Rockwell hardness tester to perform hardness tests, and take the average value after measuring three times;

[0147] (2) Flexural test: Use a universal testing machine to perform flexural performance tests.

[0148] The specific test data are shown in Table 1 below:

[0149] Table 1

[0150] Sample Hardness (HRC) Flexural strength (MPa) Example 1 65 612 Example 2 62 586 Example 3 63 597 Comparative Example 1 64 576 Comparative Example 2 65 553 Comparative Example 3 60 568 Comparative Example 4 61 550 Comparative Example 5 57 624 42CrMo alloy steel plate 51 458

[0151] Result analysis: By comparing the examples and comparative examples in Table 1 above, it can be seen that the present invention prepares a high-hardness compressive alloy steel plate through alloy steel plate pretreatment, deposition of a Ti-22Al-25Nb metal layer, spraying to set a sprayed coating, and nitriding treatment, with layers combined and related. Moreover, the performance of the alloy steel plates obtained in both the examples and comparative examples is superior to that of the untreated 42CrMo alloy steel plate. Among them, the increase in flexural strength indicates that the internal layers are closely combined, that is, the present invention also effectively improves the strength of the alloy steel plate.

[0152] In summary, the high-hardness and compressive alloy steel plate prepared by the present invention is more capable of meeting the requirements and applications in the current aerospace and automotive manufacturing fields.

[0153] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation process of a high-hardness and compression-resistant alloy steel plate, characterized in that: It includes the following steps: S1: Pretreat the alloy steel plate; S11: Clean and pretreat the alloy steel plate with an acidic cleaning solution and clean water to obtain a pretreated alloy steel plate I; S12: Spray and pretreat the pretreated alloy steel plate I with liquid carbon dioxide to obtain a pretreated alloy steel plate II; S2: Deposit a Ti-22Al-25Nb metal layer on the surface of the pretreated alloy steel plate II by using a high-energy micro-arc alloying process to obtain a coated alloy steel plate I; S3: Spray a high-hardness metal spray coating on the surface of the coated alloy steel plate I by using a supersonic flame spraying technique to obtain a sprayed coating; after heat treatment, obtain a coated alloy steel plate II; S4: Perform nitriding treatment on the coated alloy steel plate II to obtain a high-hardness and compressive alloy steel plate.

2. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The acidic cleaning solution is prepared by mixing a PT-ROClean111 type acidic cleaner, a KZD-1012 type acidic degreaser, and deionized water in a mass ratio of (1 to 1.5):(0.5 to 1):

100.

3. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The surface roughness of the pretreated alloy steel plate is Ra = 2 to 5 μm.

4. The preparation process of a high-hardness and compressive-resistant alloy steel plate according to claim 1, characterized in that: The process parameters of the high-energy micro-arc alloying process are as follows: the electroplating anode is a Ti-22Al-25Nb rod, and the electroplating cathode is the pretreated alloy steel plate; the protective gas is Ar, and its flow rate is 10 to 20 L / min; the voltage is 40 to 120 V, the frequency is 200 to 600 Hz, and the power is 400 to 1600 W; the thickness of the Ti-22Al-25Nb metal layer is 25 to 50 μm.

5. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The process parameters of the supersonic flame spraying technique are as follows: the oxygen pressure is 1.2 to 1.6 MPa, and the oxygen flow rate is 1 to 1.5 L / min; the propane pressure is 0.2 to 0.6 MPa, and the propane flow rate is 100 to 150 L / min; the nitrogen powder feeding pressure is 0.4 to 0.6 MPa, and the spraying distance is 150 to 200 mm; the thickness of the sprayed coating is 0.4 to 0.6 mm.

6. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The high-hardness metal spray coating is obtained by mixing the following components: by mass percentage, 10 to 20% of Ti, 1 to 2% of Ti@TaC whiskers, and the rest is Ti-22Al-25Nb.

7. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 6, characterized in that: The preparation method of the Ti@TaC whiskers is as follows: (1) Add Ti to a 2 to 5 wt% polyvinyl alcohol solution, soak for 2 to 4 h, filter and dry to obtain modified Ti; (2) Add TaC whiskers to deionized water, ultrasonically disperse for 1 to 2 h to obtain a TaC whisker suspension; (3) Add the modified Ti to the TaC whisker suspension, ultrasonically treat for 2 to 4 h, filter and dry to obtain Ti@TaC whiskers; Among them, the mass ratio of Ti to polyvinyl alcohol is 1:(0.06 to 0.15); the length of the TaC whiskers is 20 to 100 μm, and the tube diameter is 0.5 to 1 μm; the mass ratio of the modified Ti to the TaC whiskers is 1:(0.05 to 0.2).

8. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The process parameters of the heat treatment are as follows: introducing a mixed gas of Ar and O2 mixed in a volume ratio of (70 - 95):(5 - 30); the heat treatment temperature is 650 - 750 °C; the heat treatment time is 2 - 8 h.

9. The preparation process of a high-hardness and compression-resistant alloy steel plate according to claim 1, characterized in that: The process parameters of the nitriding treatment are as follows: the nitriding temperature is 650 - 700 °C; the nitriding voltage is 500 - 650 V; the nitriding pressure is 200 - 400 Pa; the nitrogen source is a mixed gas of N2, H2, and NH3 mixed in a volume ratio of 1:3:1, the gas flow rate is 0.5 - 1 L / min; the nitriding depth is 0.1 - 0.3 mm.

10. A high-hardness and compressive alloy steel plate prepared by the preparation process of a high-hardness and compressive alloy steel plate according to any one of claims 1 - 9.