CN-122013072-A - High-hardness corrosion-resistant iron-based amorphous alloy and preparation method thereof

Abstract

The invention discloses a high-hardness corrosion-resistant iron-based amorphous alloy and a preparation method thereof, and belongs to the technical field of amorphous alloy materials. The iron-based amorphous alloy comprises, by mass, 20% -24% of Cr, 3% -7% of Mo, 3.6% -4.0% of B, 0.3% -0.7% of C, 1.0% -1.4% of Si, 1% -5% of Al, 1% -3% of Nb and the balance of Fe. Mo and Cr cooperate to enhance corrosion resistance, B is a core amorphous forming element, C is used as a metalloid small atom to improve amorphous forming capability of an alloy system, si and B cooperate to improve amorphous forming capability and participate in forming a Si-O passive film, al optimizes melt fluidity of the alloy, nb is used as a large atom to improve atom mismatch degree of the system and improve amorphous forming capability, and the quality ratio of Fe, cr, mo, B, C, si, al, nb is accurately regulated to realize cooperative optimization of amorphous forming capability, hardness, corrosion resistance and forming stability, and meanwhile, the preparation process is simplified and the production cost is reduced.

Inventors

• GUO YATING
• WANG HAOHAN
• LI XIAOTONG
• XU DONGCHEN
• SHI HANQING

Assignees

• 南京工程学院

Dates

Publication Date

20260512

Application Date

20260202

Claims (10)

1. 1. A high-hardness corrosion-resistant iron-based amorphous alloy is characterized by comprising, by mass, 20% -24% of Cr, 3% -7% of Mo, 3.6% -4.0% of B, 0.3% -0.7% of C, 1.0% -1.4% of Si, 1% -5% of Al, 1% -3% of Nb and the balance of Fe.
2. 2. The high-hardness corrosion-resistant iron-based amorphous alloy according to claim 1, wherein the high-hardness corrosion-resistant iron-based amorphous alloy comprises, by mass, 22% of Cr, 5% of Mo, 3.8% of B, 0.5% of C, 1.2% of Si, 3% of Al, 2% of Nb, and the balance of Fe.
3. 3. The method for producing a high-hardness corrosion-resistant iron-based amorphous alloy according to claim 1, comprising the steps of: (1) Raw material pretreatment, namely selecting high-carbon ferrochrome, ferrocarbon ferrochrome, ferromolybdenum, boron carbide, ferrosilicon, electrolytic aluminum, ferroniobium and pure iron as raw materials, precisely weighing the raw materials according to the composition ratio, removing oxide skin and greasy dirt on the surface of the raw materials, and drying for later use; (2) Alloy smelting, namely placing the pretreated raw materials into a vacuum induction smelting furnace, vacuumizing until the vacuum degree is less than or equal to 5 multiplied by 10 - 3 Pa, introducing inert gas for protection, heating to 1550-1650 ℃, and preserving heat for 20-30min to enable the raw materials to be completely melted and uniformly mixed, and carrying out electromagnetic stirring during the period to ensure that alloy components are uniform; (3) Atomizing the molten alloy into amorphous alloy powder by adopting an air atomization process, cooling, sieving and collecting the powder.
4. 4. The method for producing a highly hard corrosion-resistant iron-based amorphous alloy according to claim 3, wherein in the step (2), the inert gas is nitrogen or argon, and the gas purity is not less than 99.99%.
5. 5. The method for producing a highly hard corrosion-resistant iron-based amorphous alloy according to claim 3, wherein in the step (2), the number of times of electromagnetic stirring is 2 to 3 times, and the time of each stirring is 3 to 5 minutes.
6. 6. The method for producing a highly hard corrosion-resistant iron-based amorphous alloy according to claim 3, wherein in the step (3), the atomizing pressure is 3 to 5MPa.
7. 7. The method for producing a highly hard corrosion-resistant iron-based amorphous alloy according to claim 3, wherein in the step (3), the cooling rate is not less than 10 5 K/s.
8. 8. The method for producing a highly hard corrosion-resistant iron-based amorphous alloy according to claim 3, wherein in the step (3), the particle size of the sieved powder is 50 to 150. Mu.m.
9. 9. The use of a high-hardness corrosion-resistant iron-based amorphous alloy as defined in claim 1 for the preparation of a wear-resistant corrosion-resistant iron-based amorphous coating.
10. 10. Use according to claim 9, characterized in that the powder is deposited by means of laser directed energy deposition LDED, the coating is prepared, in particular comprising the following steps: (1) Polishing the surface of the metal substrate to remove oxide skin and surface impurities; (2) Setting LDED parameters, namely, laser power is 1300-1500w, powder feeding speed is 20-25 g/min, laser scanning speed is 6-8 mm/s, and metal substrate is preheated to 300 ℃; (3) The preparation of the coating comprises the steps of generating a molten pool on the surface of a metal substrate through a laser beam, sending metal powder into a melting area through the laser beam and the powder nozzle to perform solidification and deposition, and continuously introducing argon to prevent oxidation in the deposition process.

Description

High-hardness corrosion-resistant iron-based amorphous alloy and preparation method thereof Technical Field The invention belongs to the technical field of amorphous alloy materials, and particularly relates to a high-hardness corrosion-resistant iron-based amorphous alloy and a preparation method thereof, which are particularly suitable for scenes such as wear-resistant protective coatings, precision mechanical parts and the like in strong corrosion environments such as ocean and chemical industry. Background The iron-based amorphous alloy has the advantages of high hardness, high strength, excellent corrosion resistance and soft magnetic performance, and irreplaceable advantages in the fields of power electronics, chemical corrosion protection, mechanical wear resistance and the like due to the special structure of ordered short range and disordered long range of atomic arrangement, and becomes a research hot spot in the fields of novel functional and structural materials. The performance optimization of the existing iron-based amorphous alloy focuses on the proportioning regulation and control of key elements such as Cr, mo, B, C, si, but long-term problems of contradiction between component design and performance coordination, mutual restriction of amorphous forming capacity and corrosion resistance/wear resistance and the like exist, for example, an iron-based alloy system with high Cr content is high in corrosion resistance generally, but weak in amorphous forming capacity. In addition, the problems of complex process, high cost, poor molding stability and the like still exist in the aspect of preparing the iron-based amorphous coating, and the large-scale application of the iron-based amorphous coating in actual engineering scenes is restricted. In particular, the limitation of the prior art comprises that CN117363996A discloses an iron-based amorphous alloy design with high Mo content (35-40 at percent) and a laser cladding coating preparation process, and although the high amorphous ratio is realized, the method has strict requirements on the particle size of powder, and the high Mo content leads to the obvious increase of the cost of raw materials, so that the method is not beneficial to large-scale industrial application. CN107470641a attempts to prepare iron-based amorphous powder by atomization process to reduce cost, but introducing S element into the composition adversely affects toughness and corrosion resistance of the coating. CN115608977a describes a wear-resistant amorphous coating based on a Fe-Si-B-P-Y system, and adopts vacuum gas atomization and supersonic flame spraying processes, so that although the cost is controlled, the P content in the component needs to be strictly controlled, otherwise, local crystallization of the coating is easily caused, the coating is more focused on wear resistance, the corrosion resistance under a strong corrosion environment is not fully optimized, and the comprehensive performance is still limited. CN112575280a proposes that the seawater corrosion resistance of the iron-based amorphous coating is improved by adopting a method of combining plasma spraying with water-soluble Al 2O3 or SiO 2 hole sealing, but the energy density of the plasma spraying is lower, the cooling speed of molten drops is insufficient, the amorphous phase content in the coating is usually less than or equal to 80%, the hole sealing process increases the production steps and the time cost, the interface between the hole sealing layer and the coating is easy to become a peeling starting point, and the long-term service reliability is poor. At present, most iron-based amorphous alloys are difficult to consider amorphous forming capability, high hardness, strong corrosion resistance and forming stability, or have single performance due to unreasonable component design, and cannot meet the requirements of complex service environments. Therefore, the iron-based amorphous alloy with strong amorphous forming capability, excellent comprehensive performance and stable preparation process is developed, and has important practical value. Disclosure of Invention Aiming at the technical problems that the amorphous forming capability and the comprehensive performance (hardness and corrosion resistance) of the existing iron-based amorphous alloy are difficult to be compatible, crystallization, inclusion defects and the like are easy to occur in the preparation process, the invention provides the high-hardness corrosion-resistant iron-based amorphous alloy and the preparation method thereof, and the cooperative optimization of the amorphous forming capability, the hardness, the corrosion resistance and the forming stability is realized by accurately regulating and controlling the mass ratio of Fe, cr, mo, B, C, si, al, nb, meanwhile, the preparation process is simplified, and the production cost is reduced. The high-hardness corrosion-resistant iron-based amorphous alloy comprises, by mass, 20%