A wear-resistant and corrosion-resistant iron-nickel alloy material and preparation method thereof

Abstract

The present invention relates to a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof, belonging to the technical field of alloy material preparation, and specifically comprising the following steps: first, reinforcing an iron-nickel alloy matrix with Mo, Si, and Cr, and casting into an ingot after mixed smelting; then, quenching, tempering, and homogenizing the ingot to make a preform; then, roughening and pre-oxidizing the surface of the preform, coating nano-TiN and WC-enhanced NiCrBSi materials, and finally obtaining a wear-resistant and corrosion-resistant iron-nickel alloy material. The alloy prepared by the present invention has significantly improved hardness, strength, wear resistance, and corrosion resistance, thanks to the solid solution and compound formed by the reinforcing elements, and the dense coating structure enhanced by nanoparticles, which effectively resists wear and corrosion and prolongs the service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of alloy material preparation, and in particular, relates to a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof. Background Art

[0002] Iron-nickel alloys, with their high strength, excellent physical properties and good corrosion resistance, have shown great application potential in many industrial fields. Especially in fastening mechanisms, bearings and other connection locations, iron-nickel alloys have become the preferred material for designers and engineers due to their unique combination of properties. However, as these components are subjected to frequent micro-motion loads in actual working environments, a series of problems have gradually emerged.

[0003] Fretting damage, which is damage to the surface and subsurface of materials caused by small amplitude vibration or displacement, has become a major challenge for iron-nickel alloys in these applications. This damage not only manifests itself as obvious wear and corrosion, but is also accompanied by a significant reduction in the fatigue strength of the alloy. The initiation and expansion of fretting cracks are like a time bomb hidden inside the material, which may cause fracture at any time, seriously threatening the safe operation of the equipment and the service life of the material.

[0004] Therefore, there is an urgent need for a new wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof, which can significantly improve its resistance to micro-motion damage while ensuring the high strength and hardness of the material. This new material should be able to maintain stable performance for a long time under complex and changeable working conditions, extend the service life of equipment, reduce maintenance costs, and provide strong support for the sustainable development of the industrial field. Based on the above statements, the present application provides a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof. Summary of the invention

[0005] In order to solve the problems raised in the background technology, the present application provides a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof. The iron-nickel alloy matrix is ​​reinforced with Mo, Si, and Cr, and then cast into an ingot after mixed smelting; then, the ingot is quenched, tempered, and homogenized to form a preliminary blank; then, the surface of the preliminary blank is roughened and pre-oxidized, and the NiCrBSi material reinforced with nano-TiN and WC is coated to finally obtain a wear-resistant and corrosion-resistant iron-nickel alloy material. The alloy prepared by the present invention has significantly improved hardness, strength, wear resistance, and corrosion resistance, thanks to the solid solution and compound formed by the reinforcing elements, and the dense coating structure reinforced by nanoparticles, which effectively resists wear and corrosion and prolongs the service life.

[0006] The present application provides a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof, which adopts the following technical scheme:

[0007] A method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material comprises the following preparation steps:

[0008] S1. Using Mo, Si and Cr elements to strengthen the iron-nickel alloy matrix, mixing the raw materials of each component evenly according to the proportion, smelting and pouring into a mold, and then naturally cooling to room temperature to obtain an ingot;

[0009] S2, subjecting the ingot obtained in step S1 to heat treatment steps including quenching, tempering and homogenization to obtain a preform;

[0010] S3, roughening the surface of the blank obtained in step S2, then performing a pre-oxidation treatment, and then coating the surface with a NiCrBSi material reinforced with nano-TiN and WC, thereby obtaining a wear-resistant and corrosion-resistant iron-nickel alloy material.

[0011] Furthermore, a method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material comprises the following preparation steps:

[0012] S1. The iron-nickel alloy matrix is ​​reinforced with Mo, Si and Cr elements, and the raw materials of each component are uniformly mixed according to a ratio, and then smelted in a vacuum induction melting furnace under the protection of an inert gas, and then the molten alloy liquid is poured into a mold preheated to 800-850° C., and then naturally cooled to room temperature to obtain an ingot;

[0013] S2, subjecting the ingot obtained in step S1 to heat treatment steps including quenching, tempering and homogenization to obtain a preform;

[0014] S3, roughening the surface of the blank obtained in step S2, then performing a pre-oxidation treatment, and then coating the surface with a NiCrBSi material reinforced with nano-TiN and WC, thereby obtaining a wear-resistant and corrosion-resistant iron-nickel alloy material.

[0015] Furthermore, in step S1, the Fe content in the iron-nickel alloy matrix is ​​60-70% and the Ni content is 20-30% by mass.

[0016] Furthermore, in step S1, by mass, the amount of Mo added is 2-5%, the amount of Si added is 1-3%, and the amount of Cr added is 2-7%.

[0017] Furthermore, in step S2, the preform is prepared by the following steps:

[0018] A1, quenching: the ingot obtained in step S1 is heated to 700-800°C at a heating rate of 10-20°C / min, then the heating rate is reduced to 5-10°C / min and the temperature is further increased to 850-950°C, and after being kept at this temperature for 1-2 hours, the temperature is reduced to 600-700°C at a rate of 10-20°C / min, and the temperature is further kept at this temperature for 0.5-1 hour, and the ingot is immersed in a quenching medium for cooling;

[0019] A2. Tempering: The quenched alloy is heated to 400-600°C at 5-10°C / min, then kept at this temperature for 2-4 hours, then furnace cooled to 200-300°C and air cooled to room temperature;

[0020] A3. Homogenization: Heat the tempered alloy to 700-800℃ at 5-10℃ / min and keep it at this temperature for 4-8 hours.

[0021] Furthermore, in step A2, the quenching medium used is at least one of deionized water, oil and brine.

[0022] Furthermore, in step S3, the specific operation of the surface roughening is:

[0023] The surface of the blank obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment, wherein the shot material used is cast iron shot with a diameter of 2.0-2.8 mm and a surface hardness of HRC58-63, and the shot peening machine is set to have a jet velocity of 20-80 m / s and a shot peening time of 15-20 minutes.

[0024] Furthermore, in step S3, the specific operation of the pre-oxidation treatment is:

[0025] Place the shot-peened blank in an electrolyte solution, apply voltage, and pass direct current. Set the voltage to 10-25V and the current density to 0.8-1.5A / dm 2 , the processing temperature is 15-25℃, and the processing time is 20-40 minutes.

[0026] Furthermore, the electrolyte solution is at least one of sulfuric acid, chromic acid, oxalic acid, and phosphoric acid, and the pH value of the electrolyte solution is 1-3.

[0027] Further, in step S3, the wear-resistant and corrosion-resistant iron-nickel alloy material is specifically prepared by the following steps:

[0028] NiCrBSi alloy powder is selected as a basic material and mixed with nano-TiN and WC powder to prepare a NiCrBSi material reinforced with nano-TiN and WC; then, the pre-oxidized raw billet is coated with the nano-TiN and WC reinforced NiCrBSi material on the pre-oxidized alloy surface by a plasma spraying method, and the coating thickness is set to 0.2-0.4 mm. Then, the raw billet is aged at 170-192° C. for 6-8 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material.

[0029] Furthermore, the mass ratio of NiCrBSi alloy powder, nano-TiN and WC powder is 90:(1-5):(1-3).

[0030] Furthermore, during the spraying process, the spraying distance is set to 70-150 mm, the spraying speed is set to 0.3-0.8 m / s, and the powder feed amount is set to 15-20 g / min.

[0031] In summary, this application has the following beneficial effects:

[0032] (1) In the technical solution of the present invention, the iron-nickel alloy matrix is ​​reinforced with Mo, Si, and Cr elements, which can enhance the mechanical properties of the alloy, such as hardness, strength, and toughness, while improving the wear resistance and corrosion resistance of the alloy. These reinforcing elements can form solid solutions or compounds in the alloy, increase lattice distortion, and hinder dislocation movement, thereby improving the strength and hardness of the material. In addition, elements such as Mo, Si, and Cr can also improve the oxidation resistance and corrosion resistance of the alloy, making it more stable in various harsh environments. These benefits provide a better foundation for subsequent heat treatment and surface coating, so that the final alloy product has better wear resistance and corrosion resistance.

[0033] (2) In the technical solution of the present invention, a reasonable heat treatment process is set to promote the full dissolution of each component in the alloy and improve the uniformity of solid solution formation. The quenching procedure set can better improve the hardness and strength of the alloy, while maintaining good toughness, which is conducive to resisting wear and corrosion erosion. The set tempering procedure can eliminate the internal stress and brittleness generated during the quenching process, improve the plasticity and toughness of the alloy, and make it less likely to crack and deform during use. In combination with homogenization heat treatment, the component segregation and grain inhomogeneity in the alloy can be further eliminated, and the uniformity and stability of the alloy's structure can be improved, thereby improving its wear resistance and corrosion resistance.

[0034] (3) In the technical solution of the present invention, surface roughening treatment and pre-oxidation treatment are provided. The surface roughening treatment of the product using a shot peening machine can increase the roughness of the alloy surface, which is beneficial to the bonding force between the coating and the substrate. At the same time, the roughening treatment can also remove surface defects and impurities, and improve the adhesion and durability of the coating. The preform after shot peening is pre-oxidized by an electrochemical method. By applying a voltage to the preform in an electrolyte solution to promote the formation of an oxide film on the alloy surface, not only can the corrosion resistance of the alloy be improved, but it can also serve as a good base for subsequent treatment, increase the roughness of the alloy surface, and provide a better adhesion basis for subsequent pre-oxidation treatment and coating.

[0035] (4) In the technical solution of the present invention, nano-TiN and WC are used to enhance NiCrBSi materials for coating the iron-nickel alloy. Nano-TiN and WC have the characteristics of high hardness, high wear resistance and high corrosion resistance. Nano-TiN and WC form a uniformly distributed granular structure in the coating. These particles are interconnected and supported by physical and chemical effects to form a dense coating structure, which can enhance the hardness and wear resistance of the coating and improve the corrosion resistance of the alloy. TiN has excellent lubricity and oxidation resistance, which can reduce the friction coefficient and wear rate between the coating and the friction pair; while WC has high hardness and wear resistance, which can resist the erosion of wear and corrosion. In the process of friction and corrosion, nano-TiN and WC particles can jointly withstand the erosion of external loads and corrosive media, thereby improving the wear resistance and corrosion resistance of the coating. At the same time, the lubricity and oxidation resistance of TiN can also reduce the friction coefficient and wear rate between the coating and the friction pair, further improving the service life of the product. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present invention. The experimental methods without specifying specific conditions in the following embodiments and comparative examples are usually measured according to national standards. If there is no corresponding national standard, it is carried out according to the general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0037] The raw materials involved in the specific implementation of the present application are all industrial pure, wherein the nano-TiN used has a particle size of 100-200nm and is provided by Guangzhou Hongwu Materials Technology Co., Ltd.

[0038] WC: particle size is 140 mesh, purity is 99.99%.

[0039] NiCrBSi: Ni65 NiCrBSi, particle size is 45-105μm.

[0040] The content (wt%) of the iron-nickel alloy matrix components used in the following examples and comparative examples is shown in Table 1 below:

[0041] Table 1 Iron-nickel alloy matrix composition

[0042] Element Fe Ni Cr Si Al C V content 68.6 27.3 2.6 0.57 0.31 0.21 0.16

[0043] Example 1

[0044] A method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material comprises the following preparation steps:

[0045] S1. The iron-nickel alloy matrix is ​​reinforced with Mo, Si and Cr powders, and the raw materials of each component are uniformly mixed according to a ratio, and then smelted in a vacuum induction melting furnace under the protection of a nitrogen atmosphere, and then the molten alloy liquid is poured into a mold preheated to 800° C., and then naturally cooled to room temperature to obtain an ingot;

[0046] Among them, by mass, the addition amount of Mo is 2%, the addition amount of Si is 1%, and the addition amount of Cr is 2%;

[0047] S2, subjecting the ingot obtained in step S1 to a heat treatment step including quenching, tempering and homogenization to obtain a preform, specifically comprising the following steps:

[0048] A1, quenching: the ingot obtained in step S1 is heated to 700°C at a heating rate of 10°C / min, then the heating rate is reduced to 5°C / min and the temperature is further increased to 850°C, after being kept at this temperature for 1 hour, the temperature is reduced to 600°C at a rate of 10°C / min, and the temperature is further kept at this temperature for 0.5 hour, and the ingot is immersed in a quenching medium for cooling; the quenching medium used is deionized water;

[0049] A2. Tempering: The quenched alloy is heated to 400°C at 5°C / min, then kept at this temperature for 2 hours, then furnace cooled to 200°C and air cooled to room temperature;

[0050] A3. Homogenization: Heat the tempered alloy to 700°C at 5°C / min and keep it at this temperature for 4 hours.

[0051] S3, roughening the surface of the blank obtained in step S2, and then pre-oxidizing it, then selecting NiCrBSi alloy powder as the base material, mixing it with nano-TiN and WC powder, and preparing a NiCrBSi material enhanced by nano-TiN and WC; then using a plasma spraying method to coat the NiCrBSi material enhanced by nano-TiN and WC on the surface of the pre-oxidized alloy of the blank after pre-oxidation, during the spraying process, setting the spraying distance to 70mm, the spraying speed to 0.3m / s, the powder feed amount to 15g / min, and the coating thickness to 0.2mm, and then aging the blank at 170°C for 6 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of NiCrBSi alloy powder, nano-TiN, and WC powder is 90:1:1;

[0052] Among them, the specific operation of surface roughening treatment is:

[0053] The preform obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment, wherein the shot material used is a cast iron shot with a diameter of 2.0 mm and a surface hardness of HRC58, and the shot peening machine is set to have a jet velocity of 20 m / s and a shot peening time of 15 minutes;

[0054] The specific operation of the pre-oxidation treatment is:

[0055] The shot-peened blank was placed in an electrolyte solution, and a voltage was applied. A direct current was passed, and the voltage was set to 10 V and the current density was 0.8 A / dm 2 The treatment temperature is 15°C and the treatment time is 20 minutes; the electrolyte solution is a sulfuric acid solution with a pH value of 1.

[0056] Example 2

[0057] A method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material comprises the following preparation steps:

[0058] S1. The iron-nickel alloy matrix is ​​reinforced with Mo, Si and Cr powders, and the raw materials of each component are uniformly mixed according to a ratio, and then smelted in a vacuum induction melting furnace under the protection of a nitrogen atmosphere, and then the molten alloy liquid is poured into a mold preheated to 820° C., and then naturally cooled to room temperature to obtain an ingot;

[0059] Among them, by mass, the addition amount of Mo is 3.5%, the addition amount of Si is 2%, and the addition amount of Cr is 5%;

[0060] S2, subjecting the ingot obtained in step S1 to a heat treatment step including quenching, tempering and homogenization to obtain a preform, specifically comprising the following steps:

[0061] A1, quenching: the ingot obtained in step S1 is heated to 750°C at a heating rate of 15°C / min, then the heating rate is reduced to 8°C / min and the temperature is further increased to 900°C, after being kept at this temperature for 1.5 hours, the temperature is reduced to 650°C at a rate of 15°C / min, and the temperature is further kept at this temperature for 45 minutes, and the ingot is immersed in a quenching medium for cooling; the quenching medium used is deionized water;

[0062] A2. Tempering: The quenched alloy is heated to 500°C at 8°C / min, then kept at this temperature for 3 hours, then furnace cooled to 250°C and then cooled to room temperature;

[0063] A3. Homogenization: Heat the tempered alloy to 750°C at 8°C / min and keep it at this temperature for 6 hours.

[0064] S3, roughening the surface of the blank obtained in step S2, and then pre-oxidizing it, then selecting NiCrBSi alloy powder as the base material, mixing it with nano-TiN and WC powders, and preparing a NiCrBSi material enhanced by nano-TiN and WC; then using a plasma spraying method to coat the NiCrBSi material enhanced by nano-TiN and WC on the surface of the pre-oxidized alloy of the blank after pre-oxidation, during the spraying process, setting the spraying distance to 100 mm, the spraying speed to 0.5 m / s, the powder feed amount to 18 g / min, and the coating thickness to 0.3 mm, and then aging the blank at 180° C. for 7 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of NiCrBSi alloy powder, nano-TiN, and WC powder is 90:3:2;

[0065] Among them, the specific operation of surface roughening treatment is:

[0066] The preform obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment, wherein the shot material used is a cast iron shot with a diameter of 2.5 mm and a surface hardness of HRC60, and the shot peening machine is set to have a jet velocity of 50 m / s and a shot peening time of 18 minutes;

[0067] The specific operation of the pre-oxidation treatment is:

[0068] The shot-peened blank was placed in an electrolyte solution, and a voltage was applied. A direct current was passed through the blank. The voltage was set to 18 V and the current density was 1.1 A / dm 2 The treatment temperature is 20°C and the treatment time is 30 minutes; the electrolyte solution is a sulfuric acid solution with a pH value of 2.

[0069] Example 3

[0070] A method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material comprises the following preparation steps:

[0071] S1. The iron-nickel alloy matrix is ​​reinforced with Mo, Si and Cr powders, and the raw materials of each component are uniformly mixed according to a ratio, and then smelted in a vacuum induction melting furnace under the protection of a nitrogen atmosphere, and then the molten alloy liquid is poured into a mold preheated to 850° C., and then naturally cooled to room temperature to obtain an ingot;

[0072] Among them, by mass, the addition amount of Mo is 5%, the addition amount of Si is 3%, and the addition amount of Cr is 7%;

[0073] S2, subjecting the ingot obtained in step S1 to a heat treatment step including quenching, tempering and homogenization to obtain a preform, specifically comprising the following steps:

[0074] A1, quenching: the ingot obtained in step S1 is heated to 800°C at a heating rate of 20°C / min, then the heating rate is reduced to 10°C / min and the temperature is further increased to 950°C, after being kept at this temperature for 2 hours, the temperature is reduced to 700°C at a rate of 20°C / min, and the temperature is further kept at this temperature for 1 hour, and the ingot is immersed in a quenching medium for cooling; the quenching medium used is CH01 quenching oil;

[0075] A2. Tempering: The quenched alloy is heated to 600°C at 10°C / min, then kept at this temperature for 4 hours, then furnace cooled to 300°C and air cooled to room temperature;

[0076] A3. Homogenization: Heat the tempered alloy to 800°C at 10°C / min and keep it at that temperature for 8 hours.

[0077] S3, roughening the surface of the blank obtained in step S2, and then pre-oxidizing it, then selecting NiCrBSi alloy powder as the base material, mixing it with nano-TiN and WC powder, and preparing a NiCrBSi material enhanced by nano-TiN and WC; then using a plasma spraying method to coat the NiCrBSi material enhanced by nano-TiN and WC on the surface of the pre-oxidized alloy of the blank after pre-oxidation, during the spraying process, setting the spraying distance to 150mm, the spraying speed to 0.8m / s, the powder feed amount to 20g / min, and the coating thickness to 0.4mm, and then performing an aging treatment on the blank at 192°C for 8 hours, thereby obtaining a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of NiCrBSi alloy powder, nano-TiN, and WC powder is 90:5:3;

[0078] Among them, the specific operation of surface roughening treatment is:

[0079] The preform obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment, wherein the shot material used is a cast iron shot with a diameter of 2.8 mm and a surface hardness of HRC63, and the shot peening machine is set to have a jet velocity of 80 m / s and a shot peening time of 20 minutes;

[0080] The specific operation of the pre-oxidation treatment is:

[0081] The shot-peened blank was placed in an electrolyte solution, and a voltage was applied. A direct current was passed through the blank. The voltage was set to 25 V and the current density was 1.5 A / dm 2 The treatment temperature is 25°C and the treatment time is 40 minutes; the electrolyte solution is a phosphoric acid solution with a pH value of 3.

[0082] Comparative Example 1

[0083] The difference between this comparative example 1 and example 1 is that in this comparative example, an iron-nickel alloy substrate is used instead of the ingot obtained in step S1.

[0084] Comparative Example 2

[0085] The difference between this comparative example 1 and embodiment 1 is that in step S2 of this comparative example, the specific operation of the quenching process is:

[0086] The ingot obtained in step S1 was heated to 700°C at a heating rate of 10°C / min, then the heating rate was reduced to 5°C / min and the temperature was continued to be raised to 850°C. After being kept at this temperature for 1.5 hours, it was immersed in a quenching medium for cooling; the quenching medium used was deionized water.

[0087] Comparative Example 3

[0088] The difference between this comparative example 1 and embodiment 1 is that in step S2 of this comparative example, the specific operation of the quenching process is:

[0089] The ingot obtained in step S1 was heated to 850°C at a heating rate of 10°C / min, kept at that temperature for 1 hour, then cooled to 600°C at a rate of 10°C / min, kept at that temperature for another 0.5 hour, and immersed in a quenching medium for cooling; the quenching medium used was deionized water.

[0090] Comparative Example 4

[0091] The difference between this comparative example 1 and Example 1 is that no pre-oxidation treatment is provided in step S3 of this comparative example, and the specific operation is as follows:

[0092] The surface of the blank obtained in step S2 is roughened, and then NiCrBSi alloy powder is selected as the base material, and mixed with nano-TiN and WC powder to prepare a NiCrBSi material reinforced with nano-TiN and WC; then the surface roughened blank is coated with the nano-TiN and WC reinforced NiCrBSi material on the pre-oxidized alloy surface by a plasma spraying method, and during the spraying process, the spraying distance is set to 70 mm, the spraying speed is 0.3 m / s, the powder feed amount is 15 g / min, and the coating thickness is set to 0.2 mm, and then the blank is aged at 170° C. for 6 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of NiCrBSi alloy powder, nano-TiN, and WC powder is 90:1:1;

[0093] Among them, the specific operation of surface roughening treatment is:

[0094] The surface of the blank obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment. The shot material used is cast iron shot with a diameter of 2.0 mm and a surface hardness of HRC58. The shot peening machine is set to a velocity of 20 m / s and a shot peening time of 15 minutes.

[0095] Comparative Example 5

[0096] The difference between this comparative example 1 and embodiment 1 is that the specific operation of step S3 in this comparative example is:

[0097] The blank obtained in step S2 is subjected to a pre-oxidation treatment, followed by surface roughening, and then NiCrBSi alloy powder is selected as a base material, mixed with nano-TiN and WC powders to prepare a NiCrBSi material reinforced with nano-TiN and WC; the surface roughened blank is then coated with the NiCrBSi material reinforced with nano-TiN and WC on the pre-oxidation alloy surface by a plasma spraying method, and during the spraying process, the spraying distance is set to 70 mm, the spraying speed is 0.3 m / s, the powder feed amount is 15 g / min, and the coating thickness is set to 0.2 mm, and then the blank is subjected to an aging treatment at 170° C. for 6 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of the NiCrBSi alloy powder, the nano-TiN, and the WC powder is 90:1:1;

[0098] Among them, the specific operation of pre-oxidation treatment is:

[0099] The shot-peened blank was placed in an electrolyte solution, and a voltage was applied. A direct current was passed, and the voltage was set to 10 V and the current density was 0.8 A / dm 2 , the treatment temperature is 15°C, the treatment time is 20 minutes; the electrolyte solution is a sulfuric acid solution with a pH value of 1;

[0100] The specific operation of surface roughening treatment is:

[0101] The surface of the blank obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment. The shot material used is cast iron shot with a diameter of 2.0 mm and a surface hardness of HRC58. The shot peening machine is set to a velocity of 20 m / s and a shot peening time of 15 minutes.

[0102] Comparative Example 6

[0103] The difference between this comparative example 1 and embodiment 1 is that in step S3 of this comparative example, WC is used to strengthen the NiCrBSi material, and the specific operation is as follows:

[0104] The surface of the blank obtained in step S2 is roughened, and then pre-oxidized. Then, NiCrBSi alloy powder is selected as a base material and mixed with WC powder to prepare a WC-reinforced NiCrBSi material; then, the pre-oxidized blank is coated with the WC-reinforced NiCrBSi material on the pre-oxidized alloy surface by a plasma spraying method. During the spraying process, the spraying distance is set to 70 mm, the spraying speed is 0.3 m / s, the powder feed amount is 15 g / min, and the coating thickness is set to 0.2 mm. Then, the blank is aged at 170° C. for 6 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; wherein the mass ratio of NiCrBSi alloy powder to WC is 90:2;

[0105] Among them, the specific operation of surface roughening treatment is:

[0106] The preform obtained in step S2 is washed with deionized water and dried naturally, and then placed in a shot peening machine for treatment, wherein the shot material used is a cast iron shot with a diameter of 2.0 mm and a surface hardness of HRC58, and the shot peening machine is set to have a jet velocity of 20 m / s and a shot peening time of 15 minutes;

[0107] The specific operation of the pre-oxidation treatment is:

[0108] The shot-peened blank was placed in an electrolyte solution, and a voltage was applied. A direct current was passed, and the voltage was set to 10 V and the current density was 0.8 A / dm 2 The treatment temperature is 15°C and the treatment time is 20 minutes; the electrolyte solution is a sulfuric acid solution with a pH value of 1.

[0109] Comparative Example 7

[0110] This comparative example is the commercially available iron-nickel alloy 4J52.

[0111] Performance Testing

[0112] The wear-resistant and corrosion-resistant iron-nickel alloy materials prepared in Examples 1-3 and Comparative Examples 1-7 of the present application were made into samples with a specification of 10 cm×5 cm and a thickness of 2 mm.

[0113] The mechanical properties of the samples prepared in Examples 1-3 and Comparative Examples 1-7 were tested. The samples obtained in different groups were fixed on the fixture of a tensile testing machine, and a tensile load was applied. The load was gradually increased, and the yield strength and tensile strength parameters were recorded. The surface hardness of the samples was tested using a Brinell hardness test, with a spherical indenter diameter of 5 mm, a load of 1000 kgf, a holding time of 30 s, and the hardness parameters were recorded. Five readings were obtained for each sample and the average value was taken. The test results are shown in Table 1 below.

[0114] Table 1 Test of mechanical properties of samples prepared in Examples 1-3 and Comparative Examples 1-7

[0115] Group Yield strength / MPa Tensile strength / MPa Hardness (HB) Example 1 452 597 287 Example 2 461 605 291 Example 3 460 602 283 Comparative Example 1 448 592 274 Comparative Example 2 446 590 276 Comparative Example 3 440 578 270 Comparative Example 4 436 567 244 Comparative Example 5 435 560 240 Comparative Example 6 440 570 249 Comparative Example 7 432 551 189

[0116] It can be seen from the results in Table 1 that the iron-nickel alloy materials prepared in Examples 1-3 exhibit the best mechanical properties. It can be seen from the results in the comparative examples that the use of composite metal elements to strengthen the iron-nickel alloy matrix, combined with subsequent multiple heat treatments, and TiN and WC-enhanced NiCrBSi coatings, can greatly improve the mechanical properties of the prepared iron-nickel alloy materials. It can be seen from the results in Comparative Examples 4 and 5 that the pre-oxidation treatment can further consolidate the bonding between the coating and the substrate, while improving the corrosion resistance of the alloy; and the pre-oxidation treatment in the first place will cause the oxide film formed by the pre-oxidation treatment to be broken or fallen off due to the impact of shot peening during the roughening treatment, resulting in a decrease in the bonding between the coating and the substrate, thereby affecting the wear resistance and corrosion resistance of the product. It can be seen from the results in Comparative Example 6 that the excessive proportion of WC powder leads to an increase in the brittleness of the material, which is manifested as a decrease in yield strength and tensile strength.

[0117] The wear resistance and corrosion resistance of the iron-nickel alloy materials prepared in Examples 1-3 and Comparative Examples 1-7 are now tested.

[0118] Wear resistance test: The dry friction and wear performance of the coating was studied using a "ball-on-disk" UMT-2 tribometer. A ceramic ball with a diameter of 10 mm was used on the upper body. The load was set to 50 N, the linear speed was 10 mm / s, and the wear cycle was 60 mm. The mass loss after the experiment was recorded to evaluate the wear resistance of the iron-nickel alloy material.

[0119] Corrosion resistance test: At room temperature, samples in different groups were completely immersed in a hydrochloric acid solution with a pH value of 5 for 24 hours, taken out, washed with deionized water, and then dried naturally. The mass loss was recorded and the surface was inspected to evaluate the corrosion resistance.

[0120] The appearance inspection standards are as follows:

[0121] Grade A: There is almost no change on the sample surface, with no visible corrosion marks, pitting, cracks or peeling.

[0122] Grade B: There are slight changes on the surface of the sample, but no obvious corrosion pits or peeling. There are tiny pitting or slight discoloration, which does not affect the overall structure.

[0123] Grade C: There are obvious signs of corrosion on the sample surface, including pitting, cracks or slight peeling.

[0124] Grade D: Severe corrosion occurs on the surface of the sample, including large-scale peeling, cracks and obvious corrosion pits.

[0125] The test results are shown in Table 2 below.

[0126] Table 2 Wear resistance and corrosion resistance test of the iron-nickel alloy materials prepared in Examples 1-3 and Comparative Examples 1-7

[0127]

[0128] It can be seen from the results shown in Table 2 above that the comprehensive performance of the iron-nickel alloy materials prepared in Examples 1-3 of the present application, including wear resistance and corrosion resistance, is significantly better than that of the samples prepared in Comparative Examples 1-7, that is, within the technical solution defined in the present application, the comprehensive performance of the iron-nickel alloy materials prepared is excellent.

[0129] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0130] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material, characterized in that: The method comprises the following preparation steps: S1. Using Mo, Si and Cr elements to strengthen the iron-nickel alloy matrix, mixing the raw materials of each component evenly according to the proportion, smelting and pouring into a mold, and then naturally cooling to room temperature to obtain an ingot; S2, subjecting the ingot obtained in step S1 to heat treatment steps including quenching, tempering and homogenization to obtain a preform, the specific operations are as follows: A1, quenching: the ingot obtained in step S1 is heated to 700-800°C at a heating rate of 10-20°C / min, then the heating rate is reduced to 5-10°C / min and the temperature is further increased to 850-950°C, and after being kept at this temperature for 1-2 hours, the temperature is reduced to 600-700°C at a rate of 10-20°C / min, and the temperature is further kept at this temperature for 0.5-1 hour, and the ingot is immersed in a quenching medium for cooling; wherein the quenching medium used is at least one of deionized water, oil and brine; A2. Tempering: The quenched alloy is heated to 400-600°C at 5-10°C / min, then kept at this temperature for 2-4 hours, then furnace cooled to 200-300°C and air cooled to room temperature; A3. Homogenization: Heat the tempered alloy to 700-800℃ at 5-10℃ / min and keep it at this temperature for 4-8 hours; S3, roughening the surface of the blank obtained in step S2, then pre-oxidizing it, and then coating the surface with nano-TiN and WC-enhanced NiCrBSi material to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material, the specific operation is as follows: NiCrBSi alloy powder is selected as a basic material and mixed with nano-TiN and WC powder to prepare a NiCrBSi material reinforced with nano-TiN and WC; then, the pre-oxidized raw blank is coated with the nano-TiN and WC reinforced NiCrBSi material on the pre-oxidized alloy surface by a plasma spraying method, and the coating thickness is set to 0.2-0.4 mm; then, the raw blank is subjected to aging treatment at 170-192° C. for 6-8 hours to obtain a wear-resistant and corrosion-resistant iron-nickel alloy material; the mass ratio of NiCrBSi alloy powder, nano-TiN and WC powder is 90:(1-5):(1-3); during the spraying process, the spraying distance is set to 70-150 mm, the spraying speed is set to 0.3-0.8 m / s, and the powder feeding amount is set to 15-20 g / min.

2. The method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material according to claim 1, characterized in that: In step S1, by mass, the amount of Mo added is 2-5%, the amount of Si added is 1-3%, and the amount of Cr added is 2-7%.

3. The method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material according to claim 1, characterized in that: In step S3, the specific operation of the surface roughening is: The blank obtained in step S2 is washed and dried, and then placed in a shot peening machine for treatment, wherein the shot material used is cast iron shot with a diameter of 2.0-2.8 mm and a surface hardness of HRC58-63, and the shot peening machine is set to have a jet velocity of 20-80 m / s and a shot peening time of 15-20 minutes.

4. The method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material according to claim 1, characterized in that: In step S3, the specific operation of the pre-oxidation treatment is: Place the shot-peened blank in an electrolyte solution, apply voltage, and pass direct current. Set the voltage to 10-25V and the current density to 0.8-1.5A / dm 2 , the processing temperature is 15-25℃, and the processing time is 20-40 minutes.

5. The method for preparing a wear-resistant and corrosion-resistant iron-nickel alloy material according to claim 4, characterized in that: The electrolyte solution is at least one of sulfuric acid, chromic acid, oxalic acid and phosphoric acid, and the pH value of the electrolyte solution is 1-3.

6. An iron-nickel alloy material obtained by the method for preparing the wear-resistant and corrosion-resistant iron-nickel alloy material as claimed in any one of claims 1 to 5.

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