Wear-resistant alloy for seabed ore deposit excavation and manufacturing method of wear-resistant alloy

Abstract

The invention relates to the technical field of metal materials, in particular to a wear-resistant alloy for seabed ore deposit excavation and a manufacturing method of the wear-resistant alloy for seabed ore deposit excavation, and the wear-resistant alloy comprises the following chemical components in percentage by weight: 28.0-28.4% of Fe; cr: 26.0% to 26.4%; 13.4% to 13.8% of Al; cu: 31.8% to 32.2%; the wear-resistant alloy has the beneficial effects that the hardness HRC of the wear-resistant alloy is greater than or equal to 52, the temperature is-20 DEG C, the U-shaped notch impact energy is greater than 20 J, the seawater medium corrosion rate is 0.001-0.002 mm / y, and the wear-resistant alloy has extremely high wear resistance, is suitable for being used in a marine environment, is simple in manufacturing process and relatively low in cost, and has a wide development prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of metal materials, and in particular to a wear-resistant alloy for seabed ore mining and a manufacturing method thereof. Background Art

[0002] Since the beginning of the 21st century, with the increasing scarcity of land resources, the development of marine mineral resources has become extremely important. The ocean is not only rich in energy resources such as oil, natural gas, and combustible ice, but also rich in metal deposits. Currently, marine energy development has been fully launched, and the development of metal mineral resources is about to enter an era of large-scale development. In view of this, high-quality wear-resistant materials that can adapt to the harsh environment of the ocean are bound to usher in good development opportunities and a broad market. At present, traditional wear-resistant materials do not have the performance to be used in marine environments. Wear-resistant materials suitable for use in marine environments are all wear-resistant alloys containing expensive metal elements such as Co, Ni, Mo, V, Ti, and Nb, and the alloy costs are too high. Therefore, it is particularly urgent to develop a wear-resistant alloy for marine use that is adaptable to the marine environment, has excellent wear resistance, and is reasonably priced.

[0003] The Chinese invention patent with patent publication number CN118516607A, "A Method for Preparing Wear-Resistant Cast Steel," provides a wear-resistant alloy and a preparation method thereof, relating to the technical field of wear-resistant materials. The components of the wear-resistant alloy, in weight percentage, are C2-4wt%, V9-11wt%, Cr5-8wt%, Mo2-5wt%, Mn0.5-1.0wt%, Si0.5-1.0wt%, Al0.5-1.0wt%, Ni0.4-1.0wt%, N0.05-0.15wt%, S≤0.07wt%, P≤0.07wt%, La+Ce0.25-0.45wt%, and the balance is Fe. The wear-resistant alloy of the present invention has higher hardness, better wear resistance, and excellent casting formability, while the processing and preparation method is simple. The alloy of the present invention can be applied to the key components of the metallurgical mining field and military equipment, but the patent has no use value in the direction of marine resource development. It has poor resistance to seawater corrosion and does not have the performance to be used in marine environment.

[0004] The Chinese invention patent with patent publication number CN103114247A "High-hardness and high-toughness wear-resistant steel and preparation method thereof" provides a high-hardness and high-toughness wear-resistant steel with a weight percentage composition of C 1-1.5%, Si 0.2-0.5%, Mn 10-12%, Cr 1.3-1.5%, V 0.1-0.3%, Ti 0.05-0.2%, and the balance of Fe. The invention improves the hardenability, hardenability and mechanical properties of the material by controlling the content of alloying elements and controlling the Mn / C value between 4.8 and 8.2, so that the castings poured with the material can obtain high-hardness martensite structure and good comprehensive performance of bainite structure in as-cast state, which has high strength and excellent wear resistance, and the manufacturing process is simple and the production cost is low. However, this patent is not suitable for marine resource development, and its seawater corrosion resistance is poor, and it does not have the function of use in marine environment.

[0005] The Chinese invention patent with patent publication number CN117737509A "GH5630C wear-resistant alloy and preparation method and application thereof" provides a GH5630C wear-resistant alloy including the following chemical components: C 1.1-1.4%; Cr 28.5-31.5%; Ni 1.0-2.5%; W 4.5-5.5%; Mo 0.50-1.50%; Mn 0.50-1.70%; Si 0.20-1.50%; Nb 0.3-0.6%; La 0.02-0.2%; Fe ≤3.00%; S ≤0.03%; P ≤0.04%; and the balance of Co. The application also provides a preparation method of the GH5630C wear-resistant alloy. The GH5630C wear-resistant alloy of the application has a temperature resistance of more than 500℃, and good wear resistance, impact toughness and fatigue resistance, and can be used to manufacture bearing parts for high-temperature aerobic or corrosive environment applications. However, the wear-resistant alloy in this application is suitable for wear-resistant bearing parts, but its corrosion resistance is not suitable for marine environment and cannot be applied in marine environment.

[0006] The Chinese invention patent with patent publication number CN117020214A "Preparation method of boron-containing iron-based wear-resistant alloy" provides a preparation method of a boron-containing iron-based wear-resistant alloy, which includes: mixing raw material powders according to the percentage of components, ball milling the mixed powders with a ball mill; plasma gas atomization treatment of the ball-milled powders; melting the plasma gas atomization treated powders, followed by deoxidation and deslagging treatment; after the temperature is adjusted to 1500-1550℃, adding a modifier for modification treatment, and then standing for a period of time; under vibration conditions, the iron liquid after standing is poured and cooled. The preparation method is simple in operation, high in production efficiency, and the hardness, toughness and wear resistance of the prepared boron-containing iron-based wear-resistant material are greatly improved. However, for marine environment application, its corrosion resistance is poor and not suitable for marine environment. Summary of the Invention

[0007] In order to overcome the shortcomings of the existing technology, the present invention provides a wear-resistant alloy for seabed mineral mining and a manufacturing method thereof. The invention adopts a multi-component alloy design with an equal molar ratio, and Fe, Cr, Al, and Cu can obtain a wear-resistant alloy with a single structure in the casting state. The wear-resistant alloy has a hardness of HRC ≥ 52, an impact energy of U-shaped notch > 20J at -20°C, and has extremely high wear resistance and is suitable for use in marine environments. The manufacturing process is simple, the cost is relatively low, and it has broad development prospects.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A wear-resistant alloy for seabed mineral deposit mining, wherein the chemical composition of the wear-resistant alloy is as follows by weight percentage: Fe: 28.0% to 28.4%; Cr: 26.0% to 26.4%; Al: 13.4% to 13.8%; Cu: 31.8% to 32.2%; the balance being unavoidable impurity elements, and the content of the impurity elements is no more than 0.1%.

[0010] The reasons for the chemical composition design of the present invention are described in detail below:

[0011] A solid solution with a single structure and large lattice distortion can only be formed when the configuration entropy of the alloy system reaches its maximum. Therefore, the condition of high configuration entropy can only be met when the atomic molar ratio of each component is close to 1. Therefore, the present invention has relatively strict requirements on chemical composition.

[0012] Fe is a common and economical alloying element that easily forms solid solutions with a variety of elements. It has high corrosion resistance itself and can also improve the wear resistance of the alloy. Fe is controlled at 28.0% to 28.4%.

[0013] Cr is an element in the same period as Fe and can easily form a solid solution with iron. At the same time, chromium is an excellent corrosion-resistant element, which can greatly improve the steel's resistance to seawater corrosion and wear resistance. Cr is controlled at 26.0% to 26.4%.

[0014] Compared to other elements, aluminum has a significantly different atomic radius and electronegativity. Forming a solid solution can increase lattice distortion and improve the hardness of the alloy. Furthermore, aluminum can significantly reduce the density of the alloy, with the Al content controlled at 13.4% to 13.8%.

[0015] Cu has stable chemical properties and can improve the thermal conductivity of steel, thereby increasing the cooling rate of the alloy during solidification and facilitating the formation of a single-structure solid solution. Cu can also significantly improve the toughness of the alloy, with the Cu content controlled at 31.8% to 32.2%.

[0016] Furthermore, the Fe, Cr, Al, and Cu are selected from metal elements with a purity of 99.9% or alloys with a molar ratio of each element adjusted to 1.

[0017] Furthermore, the wear-resistant alloy has a hardness of HRC ≥ 52; a U-shaped notch impact energy of > 20J at -20°C; and a density of < 6.6g / cm 3 ;The corrosion rate of seawater medium is 0.001~0.002mm / y.

[0018] Furthermore, the manufacturing process of the wear-resistant alloy is: smelting → casting → tempering:

[0019] Melting process: Use electric furnace vacuum smelting, the smelting temperature is 1300℃~1450℃, after the alloy is fully melted, keep warm for 5~10 minutes before casting;

[0020] Casting process: casting thickness d≤150mm; pouring temperature 1350℃~1400℃; demoulding when the mold surface temperature is less than 100℃;

[0021] Tempering process: The casting is heated to 300℃~350℃ with the furnace and kept warm for 10~15 minutes.

[0022] Furthermore, the casting process uses a metal casting mold, graphite is sprayed into the mold and then baked.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) Fe, Cr, Al, and Cu can obtain a single-structure wear-resistant alloy in the casting state, and its cost is relatively low, the manufacturing process is simple, and it has broad development prospects.

[0025] 2) The wear-resistant alloy of this composition has high hardness and high toughness, hardness HRC ≥ 52, -20℃, U-shaped notch impact energy > 20J, thus having good wear resistance.

[0026] 3) Compared with ordinary wear-resistant alloys, this alloy has a lower density <6.6g / cm 3 And good seawater corrosion resistance, the seawater medium corrosion rate is 0.001 ~ 0.002mm / y, suitable for use in marine environment.

[0027] 4) The heat treatment process is simple and saves energy. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are further described below:

[0029] Embodiment: The present invention adopts an equimolar ratio multi-element alloy design, and uses a vacuum electric furnace to smelt an alloy melt with qualified components. The smelting temperature is 1400℃~1450℃. After the alloy is fully melted, it is kept warm for 5~10 minutes. The alloy melt is cooled to 1350~1400℃ and casting begins. Demolding is performed when the surface temperature of the mold is less than 100℃. When the casting cools to room temperature, the surface is cleaned and the quality of the casting is inspected with the naked eye. Load it into a heating furnace, heat it to 300~350℃ with the furnace, keep it warm for 10~15 minutes, and cool it with the furnace. The specific alloy compositions of the five embodiments of the present invention are shown in Table 1, the heat treatment process parameters of the castings are shown in Table 2, and the various performance indicators of the wear-resistant alloy are shown in Table 3.

[0030] Table 1 Specific alloy composition of the embodiment of the present invention (wt, %):

[0031]

[0032] Table 2 Heat treatment process parameters of the castings according to the embodiment of the present invention:

[0033]

[0034] Table 3 Various performance indicators of the wear-resistant alloy of the embodiment of the present invention:

[0035]

[0036] From the above examples, it can be seen that the wear-resistant alloy of this composition has high hardness and high toughness, hardness HRC ≥ 52, -20℃, U-shaped notch impact energy > 20J, thus having good wear resistance and low density < 6.6g / cm 3 And good seawater corrosion resistance, the seawater medium corrosion rate is 0.001 ~ 0.002mm / y, mm / y represents the thickness corroded per year, suitable for use in marine environment.

[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A wear-resistant alloy for seabed mineral mining, characterized in that: The chemical composition of the wear-resistant alloy is as follows by weight percentage: Fe: 28.0% to 28.4%; Cr: 26.0% to 26.4%; Al: 13.4% to 13.8%; Cu: 31.8% to 32.2%; the balance is unavoidable impurity elements, and the impurity element content is not more than 0.1%; the wear-resistant alloy has a hardness HRC ≥ 52; the U-notch impact energy at -20°C is greater than 20J; the density is less than 6.6g / cm3, and the seawater medium corrosion rate is 0.001 to 0.002mm / y.

2. The wear-resistant alloy for seabed mineral deposit mining according to claim 1, characterized in that: The Fe, Cr, Al and Cu are selected from metal elements with a purity of 99.9% or alloys with a molar ratio of each element being 1.

3. A method for manufacturing a wear-resistant alloy for seabed mineral deposit mining according to claim 1, characterized in that: The manufacturing process of the wear-resistant alloy is: smelting → casting → tempering: Melting process: Use electric furnace vacuum smelting, the smelting temperature is 1300℃~1450℃, after the alloy is fully melted, keep warm for 5~10 minutes before casting; Casting process: casting thickness d≤150mm; pouring temperature 1350℃~1400℃; demoulding when the mold surface temperature is less than 100℃; Tempering process: The casting is heated to 300℃~350℃ with the furnace and kept warm for 10~15 minutes.

4. The method for manufacturing a wear-resistant alloy for seabed mineral deposit mining according to claim 3, characterized in that: The casting process adopts a metal casting mold, graphite is sprayed in the mold and then baked.

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