CN115852207A - Additively manufactured heat-resistant aluminum alloy material for high-power automobile engine and preparation method thereof - Google Patents

Abstract

The invention discloses an additively manufactured heat-resistant aluminum alloy material for high-power automobile engines and a preparation method thereof. The heat-resistant aluminum alloy material used for additively manufactured high-power automobile engines includes three groups of Ce, La and Al. The content of each component is calculated by weight percentage, the content of Ce is 2-5 wt%, the content of La is 1-5 wt%, and the balance is Al. It also includes Ca and or Mg, the content of Ca is 0.5-2wt%, and the content of Mg is 0.2-0.8wt%. The present invention creatively increases the volume fraction of intermetallic compounds through Ca alloying, produces a solid solution strengthening effect through Mg elements, and realizes a high-strength heat-resistant aluminum alloy material by means of additive manufacturing. Thirdly, the present invention contains nano-scale eutectic particles, and the high volume fraction of eutectic particles and its own thermal stability make the aluminum alloy material have both high strength and heat resistance.

Description

Additively manufactured heat-resistant aluminum alloy material for high-power automobile engine and its preparation method

technical field

The invention belongs to the technical field of aluminum alloy manufacturing, and in particular relates to an additively manufactured heat-resistant aluminum alloy material for high-power automobile engines and a preparation method thereof.

Background technique

Due to its low density, high specific strength, and good corrosion resistance, aluminum alloys have been increasingly used to replace iron alloys and titanium alloys to reduce weight in the manufacture of engine components such as engine blocks and cylinder heads. Most of the cast engine block and engine cylinder head in American and/or European aluminum alloy standards adopt traditional aluminum alloy grades such as A356, 319 and AS7GU (A356+0.5% Cu). The operating temperature of traditional internal combustion engines is about 160°C to 190°C, and engine blocks and cylinder heads cast from these traditional aluminum alloys exhibit good ductility and fatigue properties when operating in the above temperature range. The power density, exhaust temperature and cylinder pressure peaks of modern light fuel efficient engines have increased significantly, allowing the operating temperature to rise to 250°C to 350°C, much higher than the traditional range of 160°C to 190°C. However, at the above-mentioned temperature, due to the coarsening or dissolution of precipitated phases, the high-temperature strength and creep strength of the alloy show obvious deficiencies. Therefore, for the use of high-power fuel engines, a new type of aluminum alloy material is needed, which can exhibit excellent tensile, creep and fatigue strength characteristics at higher operating temperatures, and can be used in metal casting processes and Additive manufacturing process.

Contents of the invention

The invention provides a heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines and a preparation method thereof, which is used to overcome the problem that the aluminum alloy material prepared in the prior art cannot have both high strength and high temperature resistance.

To achieve the above object, the present invention adopts the following technical solutions:

Additive manufacturing heat-resistant aluminum alloy materials for high-power automobile engines, which include three components of Ce, La and Al, the content of each component is calculated by weight percentage, the content of Ce is 2-5wt%, and the content of La It is 1-5wt%, and the balance is Al.

The above-mentioned heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines also includes Ca and or Mg, the content of Ca is 0.5-2wt%, and the content of Mg is 0.2-0.8wt%.

The aforementioned heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines further includes Fe and or Cu, the content of Fe is 0.1-0.5 wt%, and the content of Cu is 0.2-0.5 wt%.

A method for preparing a heat-resistant aluminum alloy material for additive manufacturing of a high-power automobile engine, comprising the following steps:

S1: Select aluminum alloy powder raw materials; the aluminum alloy powder raw materials include Ce, La, Al, the content of Ce is 2-5wt%, the content of La is 1-5wt%, and the rest is Al;

S2: The aluminum alloy body is prepared by laser powder bed selective laser melting, the energy density of selective laser melting is 70-120J/m, and the scanning speed is 400-1600mm/s;

S3: performing stress relief annealing and strengthening heat treatment on the aluminum alloy body in sequence to obtain an aluminum alloy material.

In the above-mentioned method for preparing a heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines, in step S1, the aluminum alloy powder raw material also includes Ca and or Mg, and the Ca content is 0.5-2wt%, so Said Mg content is 0.2~0.8wt%.

In the above-mentioned method for preparing a heat-resistant aluminum alloy material for additive manufacturing of a high-power automobile engine, in step S1, the aluminum alloy powder raw material also includes Fe and or Cu, and the content of Fe is 0.1-0.5wt% , the content of Cu is 0.2-0.5wt%.

In the step S1 of the above-mentioned preparation method for additively manufacturing heat-resistant aluminum alloy materials for high-power automobile engines, the particle size of each component of the aluminum alloy powder raw material is 20-63 μm.

The above-mentioned preparation method for additively manufacturing heat-resistant aluminum alloy materials for high-power automobile engines also includes nano-scale particles with a particle diameter of 50 nm (supplementing a suitable range value), and the proportion of the nano-scale particles is not More than 25% of the total volume of each component of the aluminum alloy powder raw material.

In the above-mentioned method for preparing heat-resistant aluminum alloy materials for additive manufacturing of high-power automobile engines, in step S2, the scanning strategy of the selective laser melting is plane progressive scanning and layer-by-layer scanning, and the energy density of each layer is Fluctuation ≤ 60J/m.

The above-mentioned preparation method for additively manufacturing heat-resistant aluminum alloy materials for high-power automobile engines, the stress-relief annealing treatment described in step S3, the temperature of the stress-relief annealing is 250-300°C, and the time is 1- 3h.

Compared with prior art, the beneficial effect of the present invention has:

1. The diffusion rate of La and Ce elements added in the present invention is extremely low in aluminum. Compared with conventional alloying elements Mg, Si, Cu, etc., the diffusion rate of rare earth La and Ce in aluminum is 1-2 lower than the above elements order of magnitude, and can maintain the stability of the compound structure under high temperature and long-term action. Secondly, the rare earths La and Ce react with Al to generate Al ₁₁ Ce ₃ and/or Al ₁₁ La ₃ intermetallic compounds with high melting points, which have strong thermal stability. On the basis of Al-Ce/La eutectic alloy, the present invention creatively increases the volume fraction of intermetallic compounds through Ca alloying, produces solid solution strengthening effect through Mg element, and realizes high strength and durability by means of additive manufacturing method. Thermal aluminum alloy material. Thirdly, the present invention contains nano-scale eutectic particles, and the high volume fraction of eutectic particles and its own thermal stability make the aluminum alloy material have both high strength and heat resistance.

2. The additive manufacturing aluminum alloy material provided by the present invention belongs to a heat-free aluminum alloy material, and the printed state is the final use state. Compared with the current commercial ScalmAlloy, the production cost is greatly reduced and the production efficiency is higher.

3. Because the composition of the alloy of the present invention is close to the eutectic composition and has a smaller solidification temperature range, it has excellent printing formability, good fluidity, small linear shrinkage rate, and small tendency to thermal cracking.

4. The present invention has excellent mechanical properties at room temperature and high temperature. The mechanical performance indicators at room temperature are: tensile strength ≥ 450MPa, elongation at break ≥ 10%. 250°C high temperature tensile properties: tensile strength ≥ 350MPa, elongation at break ≥ 15.

Description of drawings

In order to explain the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on the structures shown in these drawings without any creative effort.

Fig. 1 is the SEM figure of the aluminum alloy powder obtained in the embodiment of the present invention 1;

FIG. 2 is a SEM image of the aluminum alloy material obtained in Example 1 of the present invention.

Detailed ways

In order to explain the technical solution of the present invention more clearly, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Example 1

This embodiment provides a heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines, including Ce, La, Ca, Mg and Al. Calculated by weight percentage, the content of Ce is 2wt%, and the content of La is 1wt. %, the content of Ca is 1wt%, the content of Mg is 0.5wt%, and the balance is Al. As a rare earth element, La/Ce element has a strong binding force with aluminum, and can form a strong thermally stable Al11RE3 intermetallic compound with aluminum. Mg, as an alloy strengthening element, has a solid solution strengthening effect and can improve the mechanical properties of aluminum alloys. . The SEM image of the aluminum alloy powder of this embodiment is shown in FIG. 1 .

The preparation method of this embodiment includes: selecting an aluminum alloy powder raw material with a particle size in the range of 20-63 μm; the aluminum alloy powder raw material contains 2wt% Ce, 1wt% La, 1wt% Ca, 0.5wt% Mg, and the rest is Al ;The aluminum alloy product body is prepared by selective laser melting. The scanning strategy of selective laser melting is plane progressive scanning and layer-by-layer scanning. The energy density of selective laser melting is 80J/m, and the scanning speed is 1100mm/s. The energy density fluctuation of each layer is ≤60J/m. The main body of the aluminum alloy product is subjected to stress relief annealing treatment and enhanced heat treatment in sequence. The temperature of the stress relief annealing is 280° C. for 2 hours, so as to eliminate the internal stress of the aluminum alloy product. The room temperature tensile strength of the final aluminum alloy material in this embodiment is 480 MPa, and the elongation is 8%. The high temperature tensile strength at 250°C is 360MPa, and the elongation is 12%. The SEM image of the aluminum alloy material of this embodiment is shown in FIG. 2 .

Comparative example 1

Compared with Example 1, the energy density of selective laser melting in this comparative example is 140 J/m, and the scanning speed is 1400 mm/s; other steps are the same as in Example 1. The room temperature tensile strength of the prepared heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines is 450 MPa, and the elongation is 7%. The high temperature tensile strength at 250°C is 330MPa, and the elongation is 8%.

Comparative example 2

Compared with Example 1, the energy density of selective laser melting in this comparative example is 55 J/m, and the scanning speed is 1000 mm/s; other steps are the same as in Example 1. The room temperature tensile strength of the final aluminum alloy material of this comparative example is 420 MPa, and the elongation is 4%. The high temperature tensile strength at 250°C is 310MPa, and the elongation is 6%.

Comparative example 3

Compared with Example 1, the energy density of selective laser melting in this comparative example is 70 J/m, and the scanning speed is 1000 m/s; other steps are the same as in Example 1. The room temperature tensile strength of the aluminum alloy material prepared in this comparative example is 450 MPa, and the elongation is 14%. The high temperature tensile strength at 250°C is 330MPa, and the elongation is 16%.

Example 2

The difference between this example and Example 1 is that the heat-resistant aluminum alloy materials used for additive manufacturing of high-power automobile engines include Ce, La, Ca, Fe and Al, and the content of Ce is 5wt% calculated by weight percentage , the content of La is 2wt%, the content of Ca is 0.5wt%, the content of Fe is 0.1wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting aluminum alloy powder raw materials with particle diameters in the range of 20-63 μm; the aluminum alloy powder raw materials include 5wt% Ce, 2wt% La, 0.5wt% Ca, 0.1wt% Fe, and the rest is Al; the aluminum alloy product body is prepared by selective laser melting; the energy density of the selective laser melting is 70J/m, and the scanning speed is 1600mm/s; the aluminum alloy product body is sequentially subjected to stress relief annealing treatment And strengthening heat treatment, the temperature of stress relief annealing is 300 ℃, time 1h, in order to eliminate the internal stress of aluminum alloy material products.

Example 3

The difference between this embodiment and Embodiment 1 is that the heat-resistant aluminum alloy materials used for additive manufacturing of high-power automobile engines include Ce, La, Mg and Al. Calculated by weight percentage, the content of Ce is 3wt%, and the content of La The content of Mg is 5wt%, the content of Mg is 0.2wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting the aluminum alloy powder raw material; the aluminum alloy powder raw material contains 3wt% Ce, 5wt% La, 0.2wt% Mg, and the rest is Al; the aluminum alloy powder raw material includes nanometer particles with a particle size of 50nm The proportion of the nano-scale particles is 15% of the total volume of the aluminum alloy powder raw materials, and the particle size of the rest of the aluminum alloy powder raw materials is 40-63 μm. The high volume fraction of eutectic particles and its own thermal stability make the aluminum alloy material have both high strength and heat resistance. The aluminum alloy product body is prepared by selective laser melting; the energy density of the selective laser melting is 120J/m, and the scanning speed is 400mm/s; the aluminum alloy product body is sequentially subjected to stress relief annealing treatment and enhanced heat treatment , the temperature of stress relief annealing is 250°C and the time is 3h, so as to eliminate the internal stress of the aluminum alloy material products.

Example 4

This embodiment provides a heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines, including three components of Ce, La, Mg and Al, the content of each component is calculated by weight percentage, and the content of Ce is 2wt %, the content of La is 2wt%, the content of Mg is 0.8wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting an aluminum alloy powder raw material with a particle size in the range of 20-63 μm; the aluminum alloy powder raw material contains 2wt% Ce, 2wt% La, 0.8wt% Mg, and the rest is Al; The aluminum alloy body is prepared by selective laser melting, and the aluminum alloy product body is obtained; the scanning strategy of the selective laser melting is plane progressive scanning and layer-by-layer scanning, the energy density of selective laser melting is 78J/m, and the scanning speed is 1300mm /s, the energy density fluctuation of each layer is ≤50J/m. Stress-relief annealing and enhanced heat treatment are carried out on the aluminum alloy product body. The temperature of stress-relief annealing is 280° C. and the time is 2 hours, so as to eliminate the internal stress of the aluminum alloy body, and finally obtain a heat-resistant material for additive manufacturing of high-power automobile engines. Aluminum alloy material. The room temperature tensile strength of the final aluminum alloy material in this embodiment is 350 MPa, and the elongation is 14%. The high temperature tensile strength at 250°C is 200MPa, and the elongation is 18%.

Example 5

The difference between this embodiment and Embodiment 4 is that the heat-resistant aluminum alloy material used for additive manufacturing of high-power automobile engines includes Ce, La, Ca, Fe and Al, and the content of each component is calculated by weight percentage. Ce The content of Fe is 3wt%, the content of La is 5wt%, the content of Ca is 2wt%, the content of Fe is 0.2wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting an aluminum alloy powder raw material with a particle size in the range of 20-40 μm; the aluminum alloy powder raw material contains 3wt% Ce, 5wt% La, 2wt% Ca, 0.2wt% Fe, and the rest is Al; the aluminum alloy body is prepared by selective laser melting; the energy density of selective laser melting is 70J/m, and the scanning speed is 1600mm/s; The temperature is 250°C and the time is 3 hours to eliminate the internal stress of the aluminum alloy body.

Example 6

The difference between this embodiment and Embodiment 4 is that the heat-resistant aluminum alloy materials used for additive manufacturing of high-power automobile engines include Ce, La, Cu and Al, calculated by weight percentage, the content of Ce is 5wt%, and the content of La The content of Cu is 1 wt%, the content of Cu is 0.5 wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting the aluminum alloy powder raw material, the aluminum alloy powder raw material contains 5wt% Ce, 1wt% La, 0.5wt% Cu, and the rest is Al; the aluminum alloy powder raw material includes Nano-scale particles, the proportion of the nano-scale particles is 25% of the total volume of the aluminum alloy powder raw material, and the particle size of the rest of the aluminum alloy powder raw material is 30-63 μm. The high volume fraction of eutectic particles and its own thermal stability make the aluminum alloy material have both high strength and heat resistance. The aluminum alloy body is prepared by selective laser melting to obtain the aluminum alloy product body; the scanning strategy of the selective laser melting is plane progressive scanning and layer-by-layer scanning, the energy density of selective laser melting is 120J/m, and the scanning speed is 400mm/s; the energy density fluctuation of each layer is ≤30J/m. The main body of the aluminum alloy product is subjected to stress relief annealing and enhanced heat treatment. The temperature of the stress relief annealing is 300° C. for 1 hour, so as to eliminate the internal stress of the aluminum alloy body.

Example 7

This embodiment provides a heat-resistant aluminum alloy material for additive manufacturing of high-power automobile engines, including Ce, La, Ca and Al. Calculated by weight percentage, the content of Ce is 2wt%, and the content of La is 1wt%. The content of Ca is 1 wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting the aluminum alloy powder raw material; the aluminum alloy powder raw material contains 2wt% Ce, 1wt% La, 1wt% Ca, and the rest is Al; the aluminum alloy powder raw material includes nanometer particles with a particle size of 50nm The proportion of the nano-scale particles is 10% of the total volume of the aluminum alloy powder raw materials, and the particle size of the rest of the aluminum alloy powder raw materials is 30-63 μm. The high volume fraction of eutectic particles and its own thermal stability make the aluminum alloy material have both high strength and heat resistance. The aluminum alloy body is prepared by selective laser melting to obtain the aluminum alloy product body; the energy density of the selective laser melting is 85J/m, and the scanning speed is 1100mm/s; the aluminum alloy product body is sequentially removed Stress annealing and enhanced heat treatment, the temperature of stress relief annealing is 280 ℃, time 2h, in order to eliminate the internal stress of aluminum alloy material products. The room temperature tensile strength of the final aluminum alloy material in this embodiment is 430 MPa, and the elongation is 12%. The high temperature tensile strength at 250°C is 289MPa, and the elongation is 18%.

Example 8

The difference between this embodiment and Embodiment 7 is that the heat-resistant aluminum alloy materials used for additive manufacturing of high-power automobile engines include Ce, La, Ca, Fe, Cu and Al, and the content of Ce is 5wt% calculated by weight percentage , the content of La is 2wt%, the content of Ca is 0.5wt%, the content of Fe is 0.5wt%, the content of Cu is 0.2wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting the aluminum alloy powder raw material with a particle size of 20-50 μm; the aluminum alloy powder raw material contains 5wt% Ce, 2wt% La, 0.5wt% Ca, 0.5wt% Fe, 0.2wt% Cu , the rest is Al; the aluminum alloy body is prepared by selective laser melting to obtain the aluminum alloy product body; the energy density of the selective laser melting is 90J/m, and the scanning speed is 800mm/s; for the aluminum alloy The product body is subjected to stress relief annealing and enhanced heat treatment in sequence. The temperature of stress relief annealing is 250°C for 3 hours to eliminate the internal stress of the aluminum alloy product.

Example 9

The difference between this embodiment and Embodiment 7 is that the heat-resistant aluminum alloy materials used for additive manufacturing of high-power automobile engines include Ce, La, Ca, Cu and Al. Calculated by weight percentage, the content of Ce is 4wt%, La The content of Ca is 5wt%, the content of Ca is 2wt%, the content of Cu is 0.3wt%, and the balance is Al.

The preparation method of this embodiment includes: selecting the aluminum alloy powder raw material with a particle size of 20-50 μm; the aluminum alloy powder raw material contains 4wt% Ce, 5wt% La, 2wt% Ca, 0.3wt% Cu, and the rest is Al; The aluminum alloy body is prepared by selective laser melting to obtain the aluminum alloy product body; the energy density of the selective laser melting is 70J/m, and the scanning speed is 1400mm/s; the stress relief of the aluminum alloy product body is carried out sequentially Annealing and strengthening heat treatment, the temperature of stress relief annealing is 290 ℃, time 3h, in order to eliminate the internal stress of aluminum alloy material products.

Compared with the prior art, the innovation of the present invention is:

1. The present invention contains nano-scale eutectic particles, the size of the eutectic particles is about 50nm, and the volume fraction of the particles can reach about 25%. According to the theory of metal heat resistance, the heat resistance of alloys is closely related to the volume fraction, distribution state, morphology and thermal stability of intermetallic compounds. The thermal stability of the eutectic second phase is directly related to the crystal structure, chemical composition, and diffusion rate of constituent elements. On the one hand, the diffusion rate of La and Ce elements in aluminum is extremely low. Compared with conventional alloying elements Mg, Si, Cu, etc., the diffusion rate of rare earth La and Ce in aluminum is 1-2 orders of magnitude lower than the above elements. It can maintain the stability of the structure of the compound under the action of high temperature for a long time. On the other hand, the rare earths La and Ce can generate Al11Ce3 and/or Al11La3 intermetallic compounds with high melting points by reacting with Al, and these intermetallic compounds have strong thermal stability. On the basis of Al-Ce/La eutectic alloy, the present invention creatively increases the volume fraction of intermetallic compounds through Ca alloying, produces solid solution strengthening effect through Mg element, and realizes high strength and durability by means of additive manufacturing method. Thermal aluminum alloy material.

2. The additive manufacturing aluminum alloy material provided by the present invention belongs to a heat-free aluminum alloy material, and the printed state is the final use state. Compared with the current commercial ScalmAlloy, the production cost is greatly reduced and the production efficiency is higher.

3. Because the composition of the present invention is close to the eutectic composition and has a smaller solidification temperature range, it has excellent printing formability, good fluidity, small linear shrinkage, and small tendency to thermal cracking.

4. The additively manufactured aluminum alloy material provided by the present invention has excellent mechanical properties at room temperature and high temperature. The new material not only has excellent comprehensive properties of room temperature strength and plasticity, but also has better high-temperature mechanical properties than AlSi10Mg and commercial ScalmAlloy.

5. The aluminum alloy material provided by the present invention or the aluminum alloy material prepared by the preparation method of the present invention is tested according to GB/T 228.1-2010 and GB/T 4338-2006 standards, and the room temperature mechanical performance index of the aluminum alloy material is: Tensile strength ≥ 450MPa, elongation at break ≥ 10%. 250°C high temperature tensile properties: tensile strength ≥ 350MPa, elongation at break ≥ 15.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The additive manufacturing heat-resistant aluminum alloy material for the high-power automobile engine is characterized by comprising Ce,

La and Al, wherein the content of each component is calculated according to the weight percentage, the content of Ce is 2-5 wt%, the content of La is 1-5 wt%, and the balance is Al.

2. The additive manufacturing heat-resistant aluminum alloy material for the high-power automobile engine as claimed in claim 1, further comprising 0.5-2wt% of Ca and 0.2-0.8wt% of Mg.

3. The additive manufacturing heat-resistant aluminum alloy material for the high-power automobile engine as recited in claim 1, further comprising Fe and/or Cu, wherein the content of Fe is 0.1-0.5wt%, and the content of Cu is 0.2-0.5wt%.

4. The preparation method of the additive manufacturing heat-resistant aluminum alloy material for the high-power automobile engine as claimed in any one of claims 1 to 3, characterized by comprising the following steps of:

s1: selecting an aluminum alloy powder raw material; the aluminum alloy powder raw material comprises 2-5 wt% of Ce, la, al and Ce, 1-5 wt% of La and the balance of Al;

s2: preparing an aluminum alloy body by a laser powder bed selective laser melting mode, wherein the energy density of selective laser melting is 70-120J/m, and the scanning speed is 400-1600 mm/s;

s3: and sequentially carrying out stress relief annealing and strengthening heat treatment on the aluminum alloy body to obtain the aluminum alloy material.

5. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 4

The preparation method is characterized in that in the step S1, the aluminum alloy powder raw material further comprises Ca and/or Mg, the content of the Ca is 0.5-2wt%, and the content of the Mg is 0.2-0.8wt%.

6. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 4

The preparation method is characterized in that in the step S1, the aluminum alloy powder raw material also comprises Fe and/or Cu, wherein the content of Fe is 0.1-0.5wt%, and the content of Cu is 0.2-0.5wt%.

7. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 4

The preparation method is characterized in that in the step S1, the particle size of each component of the aluminum alloy powder raw material is 20-63 mu m.

8. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 7

The preparation method is characterized by further comprising nano-scale particles with the particle size of 50nm (supplemented with proper range values), wherein the proportion of the nano-scale particles is not more than 25 percent of the total volume of all the components of the aluminum alloy powder raw material.

9. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 4

The preparation method is characterized in that in the step S2, the scanning strategies of selective laser melting are plane progressive scanning and layer-by-layer scanning, and the energy density fluctuation of each layer is less than or equal to 60J/m.

10. Additive manufacturing heat-resistant aluminum alloy material for high-power automobile engine according to claim 4

The preparation method is characterized in that the stress relief annealing treatment is carried out in the step S3, the temperature of the stress relief annealing treatment is 250-300 ℃, and the time is 1-3 h.

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