Self-fluxing Fe-based alloy powder, TiC / Fe cladding layer and preparation method of self-fluxing Fe-based alloy powder and TiC / Fe cladding layer

Abstract

The invention discloses self-fluxing Fe-based alloy powder, a TiC / Fe cladding layer and a preparation method of the self-fluxing Fe-based alloy powder, the self-fluxing Fe-based alloy powder comprises 2-3 wt% of Ti powder, 4.0-5.5 wt% of Cr3C2 powder and the balance Fe-based matrix powder, and the Fe-based matrix powder comprises the chemical components of 13-18 wt% of Cr, 1.5-2.7 wt% of Ni, 1.0-1.5 wt% of B, 0.8-1.8 wt% of Si, 1.0-2.2 wt% of C, 1.2-2.5 wt% of N, 3-4.8 wt% of Nb, 1.6-2.2 wt% of V and the balance Fe and inevitable impurities. The self-fluxing Fe-based alloy powder comprises Ti powder, Cr3C2 powder and the balance Fe-based matrix powder, and the Fe-based matrix powder comprises Nb and V capable of refining a grain structure, so that a TiC / Fe cladding layer formed by the self-fluxing Fe-based alloy powder has good hardness, impact resistance and corrosion resistance at the same time.

Description

Technical Field

[0001] This invention belongs to the field of metal powder processing technology, and particularly relates to a self-fluxing Fe-based alloy powder, a TiC / Fe cladding layer, and a method for preparing the same. Background Technology

[0002] Laser cladding technology is a cutting-edge surface modification technique with unique advantages such as high efficiency, precision, flexibility, innovation, and environmental friendliness, making it promising for applications across multiple industries. By using a high-energy laser beam, it can precisely clad specific materials onto a substrate surface, enabling localized addition, repair, or reconstruction of materials. Its applications are particularly prominent in aerospace, automotive manufacturing, building materials, energy, and furniture / appliance industries.

[0003] Self-fluxing alloy powders are among the commonly used laser cladding powders in laser cladding technology. They are alloys in which elements such as boron (B) and silicon (Si) are added to give them fluxing properties. Self-fluxing Fe-based alloy powders, in particular, are widely used in laser cladding due to their abundant and inexpensive raw materials, excellent wettability and adhesion to most structural substrates, and resistance to peeling. However, while the cladding layer formed by self-fluxing Fe-based alloy powders possesses these advantages and hardness, its corrosion resistance is generally poor.

[0004] To address the technical problem of the generally poor corrosion resistance of Fe-based cladding layers, existing technologies typically use Cr to optimize their corrosion resistance. However, this usually reduces the impact resistance of Fe-based cladding layers. Therefore, how to provide an Fe-based cladding layer that balances hardness, impact resistance, and corrosion resistance is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a self-fluxing Fe-based alloy powder, a TiC / Fe cladding layer, and a method for preparing the same. The self-fluxing Fe-based alloy powder comprises 2-3 wt% Ti powder, 4.0-5.5 wt% Cr3C2 powder, and the balance Fe-based matrix powder. The Fe-based matrix powder includes B, Si, N, C, Ni, and Cr, which is traditionally used to improve corrosion resistance. It also includes Nb and V, which can refine the grain structure. This significantly improves the corrosion resistance of the TiC / Fe cladding layer formed by the self-fluxing Fe-based alloy powder without compromising its hardness and impact resistance.

[0006] The first objective of this invention is to provide a self-fluxing Fe-based alloy powder, comprising, by mass percentage, 2-3 wt% Ti powder, 4.0-5.5 wt% Cr3C2 powder, and the balance Fe-based matrix powder;

[0007] The Fe-based matrix powder has a mass percentage of 100 wt%. The chemical composition of the Fe-based matrix powder includes 13-18 wt% Cr, 1.5-2.7 wt% Ni, 1.0-1.5 wt% B, 0.8-1.8 wt% Si, 1.0-2.2 wt% C, 1.2-2.5 wt% N, 3-4.8 wt% Nb, 1.6-2.2 wt% V, the balance being Fe and unavoidable impurities.

[0008] In some embodiments of the present invention, the chemical composition of the Fe-based matrix powder further includes 0.2 to 0.8 wt% Co. It is understood that the Co is not among the aforementioned "unavoidable impurities".

[0009] In some embodiments of the present invention, the particle size range of the dried self-fluxing Fe-based alloy powder is 80~120 μm.

[0010] The second objective of this invention is to provide the application of the above-mentioned self-fluxing Fe-based alloy powder in the in-situ generation of TiC / Fe cladding layers using laser cladding.

[0011] The third objective of this invention is to provide a method for preparing a TiC / Fe cladding layer in situ using laser cladding, comprising the following steps:

[0012] S1. Dry the above self-fluxing Fe-based alloy powder to obtain Fe-based composite powder;

[0013] S2. Pre-treat the tool surface to remove oil and impurities adhering to the tool surface;

[0014] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface;

[0015] The order of S1 and S2 is not important.

[0016] In some embodiments of the present invention, the material of the cutting tool in S2 is one of carbon steel, alloy steel, and stainless steel.

[0017] In some embodiments of the present invention, the technical parameters of the laser cladding technology described in S3 are: laser cladding power of 1000~3000W.

[0018] In some embodiments of the present invention, the laser cladding technology described in S3 uses a coaxial powder feeding method, and the laser scanning frequency is 800~1200Hz, the spot diameter is 4~6mm, and the cladding speed is 150~250mm / min.

[0019] In some embodiments of the present invention, the thickness of the TiC / Fe cladding layer is 0.5~2.0 mm.

[0020] In some embodiments of the present invention, after the TiC / Fe cladding layer is generated in situ on the tool surface in step S3, a post-processing step is also included.

[0021] In some embodiments of the present invention, the post-processing steps include cooling to 40~100°C, pickling, and polishing.

[0022] The fourth objective of this invention is to provide a TiC / Fe cladding layer, which is formed by the above-described preparation method.

[0023] The fifth objective of this invention is to provide a cutting tool containing the aforementioned TiC / Fe cladding layer.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention uses a self-fluxing Fe-based alloy powder containing 3-4.8 wt% Nb and 1.6-2.2 wt% V, mixed with 2-3 wt% Ti powder and 4.0-5.5 wt% Cr3C2 powder, to clad the powder onto kitchen knives in situ using laser cladding technology to generate a TiC / Fe cladding layer, achieving a balance of hardness, impact resistance, and corrosion resistance. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0027] Example 1

[0028] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0029] S1. Using 100wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 15.0wt% Cr, 2.2wt% Ni, 1.2wt% B, 1.3wt% Si, 1.6wt% C, 1.8wt% N, 4.8wt% Nb, 2.2wt% V, the balance being Fe and unavoidable impurities. Using 100wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5wt% Ti powder, 4.5wt% Cr3C2 powder, the balance being Fe-based matrix powder. Dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120μm.

[0030] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0031] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0032] Example 2

[0033] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0034] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 18.0 wt% Cr, 1.5 wt% Ni, 1.0 wt% B, 1.8 wt% Si, 2.2 wt% C, 1.2 wt% N, 3.0 wt% Nb, 1.6 wt% V, the balance being Fe and unavoidable impurities; using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 3.0 wt% Ti powder, 4.0 wt% Cr3C2 powder, the balance being Fe-based matrix powder; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm;

[0035] S2. Pre-treat the surface of the stainless steel knife by polishing the surface of the stainless steel knife with metallographic sandpaper to remove oil and impurities adhering to the surface of the stainless steel knife.

[0036] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the surface of the pretreated stainless steel cutting tool obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the cutting tool surface. The laser cladding power is 1200W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 4mm, and the cladding speed is 150mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 0.6mm.

[0037] Example 3

[0038] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0039] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 13.0 wt% Cr, 2.7 wt% Ni, 1.5 wt% B, 0.8 wt% Si, 1.0 wt% C, 2.5 wt% N, 4.0 wt% Nb, 2.0 wt% V, with the balance being Fe and unavoidable impurities. Using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.0 wt% Ti powder, 5.2 wt% Cr3C2 powder, with the balance being Fe-based matrix powder. Dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm.

[0040] S2. Pre-treat the surface of the alloy steel cutting tool by polishing the surface of the alloy steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the alloy steel cutting tool;

[0041] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the surface of the pretreated alloy steel cutting tool obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the cutting tool surface. The laser cladding power is 2800W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 6mm, and the cladding speed is 250mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.8mm.

[0042] Example 4

[0043] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0044] S1. Using 100wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 14.8wt% Cr, 2.2wt% Ni, 1.2wt% B, 1.3wt% Si, 1.6wt% C, 1.8wt% N, 4.8wt% Nb, 2.2wt% V, 0.2wt% Co, with the balance being Fe and unavoidable impurities; using 100wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5wt% Ti powder, 4.5wt% Cr3C2 powder, with the balance being Fe-based matrix powder; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120μm;

[0045] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0046] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0047] Example 5

[0048] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0049] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 14.5 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 4.8 wt% Nb, 2.2 wt% V, 0.5 wt% Co, with the balance being Fe and unavoidable impurities; using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, with the balance being Fe-based matrix powder; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm;

[0050] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0051] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0052] Example 6

[0053] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0054] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 14.2 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 4.8 wt% Nb, 2.2 wt% V, 0.8 wt% Co, with the balance being Fe and unavoidable impurities; using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, with the balance being Fe-based matrix powder; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm;

[0055] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0056] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0057] Example 7

[0058] This embodiment provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0059] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 13.5 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 4.8 wt% Nb, 2.2 wt% V, 1.5 wt% Co, with the balance being Fe and unavoidable impurities; using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, with the balance being Fe-based matrix powder; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm;

[0060] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0061] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0062] Comparative Example 1

[0063] This comparative example provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0064] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 15.0 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, the balance Fe, and unavoidable impurities by mass percentage; using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, and the balance Fe-based matrix powder by mass percentage; dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm;

[0065] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0066] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0067] Comparative Example 2

[0068] This comparative example provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0069] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 15.0 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 7.0 wt% Nb, the balance being Fe and unavoidable impurities. Using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, the balance being Fe-based matrix powder. Dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm.

[0070] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0071] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0072] Comparative Example 3

[0073] This comparative example provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0074] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 15.0 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 7.0 wt% V, the balance being Fe and unavoidable impurities. Using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, the balance being Fe-based matrix powder. Dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm.

[0075] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0076] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0077] Comparative Example 4

[0078] This comparative example provides a cutting tool containing a TiC / Fe cladding layer, the preparation method of which includes the following steps:

[0079] S1. Using 100 wt% Fe-based matrix powder, prepare Fe-based matrix powder containing 15.0 wt% Cr, 2.2 wt% Ni, 1.2 wt% B, 1.3 wt% Si, 1.6 wt% C, 1.8 wt% N, 2.2 wt% Nb, 4.8 wt% V, the balance being Fe and unavoidable impurities. Using 100 wt% self-fluxing Fe-based alloy powder, prepare self-fluxing Fe-based alloy powder containing 2.5 wt% Ti powder, 4.5 wt% Cr3C2 powder, the balance being Fe-based matrix powder. Dry the self-fluxing Fe-based alloy powder to obtain Fe-based composite powder with a particle size range of 80~120 μm.

[0080] S2. Pre-treat the surface of the carbon steel cutting tool by polishing the surface of the carbon steel cutting tool with metallographic sandpaper to remove oil and impurities adhering to the surface of the carbon steel cutting tool.

[0081] S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated carbon steel tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface. The laser cladding power is 2000W, and the cladding method is coaxial powder feeding. The laser scanning frequency of coaxial powder feeding is 1000Hz, the spot diameter is 5mm, and the cladding speed is 200mm / min. Afterward, the temperature is lowered to 40℃, pickled, and polished to obtain a TiC / Fe cladding layer with a thickness of 1.0mm.

[0082] The cutting tools containing TiC / Fe cladding layers obtained in Examples 1-7 and the cutting tools containing TiC / Fe cladding layers obtained in Comparative Examples 1-4 were subjected to the following performance tests, and the results are shown in Table 1:

[0083] (1) Vickers hardness: The pressure is 0.2 kgf, and the result is expressed as HV0.2;

[0084] (2) Impact resistance: The number of impacts required for the cladding layer to begin to crack under an impact force of 120MPa using a φ19 carbide cutting tooth;

[0085] (3) Corrosion resistance: Electrochemical tests were conducted in a 5.0 wt% NaCl solution using a three-electrode system, consisting of the working electrode of the sample, a platinum sheet as the counter electrode, and a saturated calomel reference electrode. The self-corrosion potential and self-corrosion current density were tested.

[0086] Table 1: Results of hardness, impact resistance and corrosion resistance of different cladding layers

[0087]

[0088] As shown in Table 1, the self-fluxing Fe-based alloy powder containing a certain mass percentage of Nb and V of the present invention forms a cladding layer that combines hardness, impact resistance and corrosion resistance.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application specification, they can still modify or make equivalent substitutions to the specific implementation of the present invention, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.

Claims

1. A self-fluxing Fe-based alloy powder, characterized in that, By mass percentage, it includes 2-3 wt% Ti powder, 4.0-5.5 wt% Cr3C2 powder, and the balance Fe-based matrix powder; The Fe-based matrix powder has a mass percentage of 100 wt%. The chemical composition of the Fe-based matrix powder includes 13-18 wt% Cr, 1.5-2.7 wt% Ni, 1.0-1.5 wt% B, 0.8-1.8 wt% Si, 1.0-2.2 wt% C, 1.2-2.5 wt% N, 3-4.8 wt% Nb, 1.6-2.2 wt% V, the balance being Fe and unavoidable impurities.

2. The self-fluxing Fe-based alloy powder according to claim 1, characterized in that, The Fe-based matrix powder also contains 0.2 to 0.8 wt% Co by mass percentage.

3. The self-fluxing Fe-based alloy powder according to claim 1, characterized in that, The dried self-fluxing Fe-based alloy powder has a particle size range of 80~120μm.

4. The application of the self-fluxing Fe-based alloy powder according to any one of claims 1 to 3 in the in-situ generation of TiC / Fe cladding layers using laser cladding.

5. A method for preparing a TiC / Fe cladding layer in situ using laser cladding, characterized in that, Includes the following steps: S1. Dry the self-fluxing Fe-based alloy powder according to any one of claims 1 to 3 to obtain Fe-based composite powder; S2. Pre-treat the tool surface to remove oil and impurities adhering to the tool surface; S3. Using laser cladding technology, the Fe-based composite powder obtained in S1 is clad onto the pretreated tool surface obtained in S2, thereby generating a TiC / Fe cladding layer in situ on the tool surface; The order of S1 and S2 is not important.

6. The preparation method according to claim 5, characterized in that, The cutting tool described in S2 is made of one of the following materials: carbon steel, alloy steel, or stainless steel.

7. The preparation method according to claim 5, characterized in that, The technical parameters of the laser cladding technology described in S3 are: laser cladding power of 1000~3000W; And / or, the laser cladding technology described in S3 uses a coaxial powder feeding method, with a powder feeding amount of 20~24g / min, a laser scanning frequency of 800~1200Hz, a spot diameter of 4~6mm, and a cladding speed of 150~250mm / min.

8. The preparation method according to claim 5, characterized in that, The thickness of the TiC / Fe cladding layer is 0.5~2.0 mm.

9. A TiC / Fe cladding layer, characterized in that, It is formed by the preparation method according to any one of claims 5 to 8.

10. A cutting tool, characterized in that, It contains the TiC / Fe cladding layer as described in claim 9.

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