Metal material and preparation method thereof

Abstract

The invention provides a preparation method of a metal material and an oxide reinforced metal material. The preparation method adopts a metal additive manufacturing process and comprises the following steps: in a printing cabin of the metal additive manufacturing process, performing in-situ oxidation on alloy raw material powder; and carrying out forming treatment on the alloy raw material powder subjected to in-situ oxidation by adopting a metal additive manufacturing process to obtain the oxide reinforced metal material. The size of the oxide in the oxide reinforced metal material is 1-10 nm.

Description

Technical Field

[0001] The present disclosure relates to the technical field of metal additive manufacturing, and more particularly, to a method for preparing a metal material and an oxide-strengthened metal material obtained by using the method. Background Art

[0002] Nano-oxide dispersion-strengthened (ODS) metal materials are very suitable for various extreme high-temperature working environments, such as aviation, aerospace, nuclear reactors, etc., due to their excellent high-temperature mechanical properties, high-temperature creep properties, radiation resistance, etc.

[0003] However, the traditional method for preparing nano-oxides is to uniformly mix alloy powders with nano-oxide particles, and then use mechanical alloying to uniformly introduce the oxide particles into the alloy powders. Finally, bulk nano-oxide dispersion-strengthened metal materials are prepared by powder metallurgy methods, such as hot isostatic pressing, hot extrusion, etc. The traditional method has high costs, low forming quality, low product yield, and cannot be prepared in large quantities. Moreover, the process of mechanical alloying is likely to introduce gas molecules or other impurity elements, affecting the final properties of the formed samples. The disadvantages of the traditional preparation method of nano-oxide dispersion-strengthened metal materials greatly limit their applications and also increase the application costs in some fields where ODS metal materials have to be used. When using the casting method to prepare ODS metal materials, the problems of oxide aggregation and growth will inevitably occur, seriously affecting the final properties of ODS metal materials. Therefore, it is very meaningful to develop a new low-cost preparation method for ultra-high-strength nano-oxide dispersion-strengthened metal materials. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide a method for preparing a metal material and an oxide-strengthened metal material obtained by using the method.

[0005] According to one aspect of the present disclosure, there is provided a method for preparing a metal material, the preparation method using a metal additive manufacturing process, including: in a printing chamber of the metal additive manufacturing process, in-situ oxidizing an alloy raw material powder; and using the metal additive manufacturing process to perform a forming process on the in-situ oxidized alloy raw material powder to obtain an oxide-strengthened metal material.

[0006] According to an embodiment of the present disclosure, the chemical components of the alloy raw material powder include at least a first chemical component and a second chemical component, wherein the oxidability of the first chemical component is less than that of the second chemical component, the first chemical component is used for in-situ oxidizing to form an oxide layer, and the second chemical component is used for destroying the oxide layer and combining with oxygen in the oxide layer to form an oxide for strengthening the metal material.

[0007] According to an embodiment of the present disclosure, the step of in-situ oxidizing the alloy raw material powder in the printing chamber of the metal additive manufacturing process includes: controlling the oxygen concentration in the printing chamber, in-situ oxidizing the first chemical component in the alloy raw material powder, and forming the oxide layer on the surface of the alloy raw material powder.

[0008] According to an embodiment of the present disclosure, the oxygen concentration in the printing chamber is 300 - 5000 ppm.

[0009] According to an embodiment of the present disclosure, the thickness of the oxide layer is greater than or equal to 10 nm.

[0010] According to an embodiment of the present disclosure, the step of using the metal additive manufacturing process to form the in-situ oxidized alloy raw material powder into an oxide-strengthened metal material includes: using the metal additive manufacturing process to break the oxide layer formed on the surface of the alloy raw material powder; and the O in the oxide layer combines with the second chemical component to form fine and dispersed oxides to strengthen the metal material, thereby obtaining the oxide-strengthened metal material.

[0011] According to an embodiment of the present disclosure, the size of the oxide is 1 - 10 nm.

[0012] According to an embodiment of the present disclosure, the O content of the oxide is 0.05 - 0.5%.

[0013] According to an embodiment of the present disclosure, the first chemical component and the second chemical component are different ones selected from Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu.

[0014] According to an embodiment of the present disclosure, the first chemical component is Fe and the second chemical component is Ti.

[0015] According to an embodiment of the present disclosure, the chemical components of the oxide layer include Fe and O, and the chemical components of the oxide include Ti and O.

[0016] According to an embodiment of the present disclosure, before the step of in-situ oxidizing the alloy raw material powder, it further includes: preparing the alloy raw material powder according to the composition ratio of the metal material by using vacuum atomization powder making technology and / or rotating electrode technology.

[0017] According to an embodiment of the present disclosure, the metal additive manufacturing technology is any one of selective laser melting technology, laser direct deposition, and selective electron beam melting technology.

[0018] Another aspect of the present disclosure provides an oxide-strengthened metal material prepared by the above method, wherein the size of the oxide in the obtained oxide-strengthened metal material is 1-10 nm.

[0019] According to an embodiment of the present disclosure, the O content of the oxide is 0.05-0.5%.

[0020] According to an embodiment of the present disclosure, the chemical components of the oxide include at least one of Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu.

[0021] As can be seen from the above technical solutions, the beneficial effects of the metal material and its preparation method provided by the present disclosure are as follows:

[0022] 1. The preparation method of the metal material provided by the present disclosure introduces oxygen elements by in-situ oxidation during the additive manufacturing process, and during the subsequent forming process, the oxygen elements are combined with the alloy raw material powder to in-situ form a large number of fine and dispersed oxides, preparing an oxide dispersion-strengthened metal material. Compared with the traditional mechanical alloying method, the additive manufacturing technology is more economical, efficient, and can be prepared in large quantities. It is very suitable for manufacturing parts with complex structures, promoting the application of ODS metal materials in extreme service fields such as aerospace, aviation, and nuclear energy.

[0023] 2. The preparation method of the metal material provided by the present disclosure does not require pre-mixing oxides into the alloy powder in advance, nor does it require pre-treatment of the powder, greatly reducing the time cost. Only the printing process needs to be controlled to oxidize the alloy powder, simplifying the preparation process of ODS metal materials, reducing the preparation cost, and improving the preparation quality.

[0024] 3. The preparation method of the metal material provided by the present disclosure prepares metal materials by additive manufacturing, and parts with complex structures can be prepared without mechanical processing, enabling the ODS metal materials to be prepared in large quantities and with high quality and freely formed.

[0025] 4. For the oxide-strengthened metal material provided by the present disclosure, the size of the oxide is 1-10 nm, and the forming density reaches more than 99.8%. Its mechanical properties and service time under extreme conditions are optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Through the following description of the embodiments of the present disclosure with reference to the drawings, the above and other objects, features, and advantages of the present disclosure will become clearer. In the drawings:

[0027] Figure 1 Schematically shows a flowchart of the preparation method of the metal material in the embodiment of the present disclosure;

[0028] Figure 2 Schematically shows the diffraction spot pattern of the TEM of the oxide-strengthened metal material in Embodiment 1 of the present disclosure;

[0029] Figure 3 Schematically shows the TEM image of the oxide-strengthened metal material in Embodiment 1 of the present disclosure;

[0030] Figure 4 Schematically shows the EBSD image of the oxide-strengthened metal material in Embodiment 1 of the present disclosure;

[0031] Figure 5 Schematically shows the SEM image of the oxide-strengthened metal material in Embodiment 1 of the present disclosure.

[0032] The reference signs in the drawings are: 1 - oxide, 2 - ferrite, 3 - oxide layer. Detailed implementation manners

[0033] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, obviously, one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present disclosure.

[0034] The terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The terms "including", "comprising", etc. used herein indicate the presence of the described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0035] In the case of using expressions such as "at least one of A, B, or C, etc.", generally, it should be interpreted according to the meaning that those skilled in the art usually understand this expression (for example, "a system having at least one of A, B, or C" should include, but is not limited to, a system having only A, only B, only C, having A and B, having A and C, having B and C, and / or having A, B, C, etc.). The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features.

[0036] Metal additive manufacturing technologies, such as Selective Laser Melting (SLM), Electron Beam Selective Melting, etc., are manufacturing technologies that use powder as raw material and through laser or other energy sources, layer by layer melt and solidify the powder and finally form a shape. Metal additive manufacturing technologies use high-density energy sources for forming, with characteristics of micron-sized small molten pools and a cooling rate of 10 3 -10 6 K / s, which can greatly reduce the problem of aggregation and growth of oxides during the forming process, and can form fine-grained structures to further improve high-temperature mechanical properties and thermal creep properties.

[0037] Figure 1 Schematically shows the flowchart of the method for preparing a metal material in an embodiment of the present disclosure.

[0038] As Figure 1 shown, an embodiment of the present disclosure provides a method for preparing a metal material. The preparation method uses a metal additive manufacturing process, and the specific steps are as follows:

[0039] Step 1: In the printing chamber of the metal additive manufacturing process, in-situ oxidation is carried out on the alloy raw material powder to adsorb a large amount of oxygen elements.

[0040] Step 2: Use the metal additive manufacturing process to carry out a forming process on the alloy raw material powder after the in-situ oxidation to obtain an oxide-strengthened metal material.

[0041] The method for preparing a metal material provided by the present disclosure introduces oxygen elements by using in-situ oxidation during the additive manufacturing process, and during the subsequent forming process, makes the oxygen elements combine with the alloy raw material powder to in-situ form a large number of fine and dispersed oxides, and prepares an oxide dispersion-strengthened metal material. Compared with the traditional mechanical alloying method, the additive manufacturing technology is more economical, efficient, and can be prepared in large quantities, and is very suitable for manufacturing parts with complex structures, promoting the application of ODS metal materials in extreme service fields such as aerospace, aviation, and nuclear energy.

[0042] According to an embodiment of the present disclosure, the alloy raw material powder contains oxidizing elements for adsorbing oxygen elements. Optionally, in order to further refine the size of the oxides used to strengthen the metal material, the chemical components of the oxidizing elements in the alloy raw material powder at least include a first chemical component and a second chemical component, wherein the oxidizing property of the first chemical component is less than that of the second chemical component. The first chemical component is used to form an oxide layer by in-situ oxidation before the alloy powder is melted, and the second chemical component is used to break the oxide layer during the subsequent forming process and combine with the oxygen in the oxide layer to form fine and dispersed oxides for strengthening the metal material. For example, in the printing chamber, before the alloy raw material powder is melted by laser, a layer of the already spread alloy raw material powder is oxidized in-situ, so that an oxide layer with a thickness of 50-200 nm is formed on the surface of this layer of powder. This oxide layer is mainly formed by the in-situ oxidation of the first chemical component. Under the action of the subsequent laser, the oxide layer reacts with the second chemical component with stronger oxidizing property in the powder to generate fine and dispersed oxides. It should be noted that in order to ensure that during the in-situ oxidation to form the oxide layer, it is mainly the oxidation reaction of the first chemical component with weak oxidizing property and to avoid the premature oxidation of other elements, the content of the second chemical component with strong oxidizing property should not be too high, and the mass percentage should be 0.05-5%.

[0043] According to an embodiment of the present disclosure, in the printing chamber of the metal additive manufacturing process, the step of in-situ oxidizing the alloy raw material powder includes: controlling the oxygen concentration in the printing chamber to in-situ oxidize the first chemical component in the alloy raw material powder and form the oxide layer on the surface of the alloy raw material powder.

[0044] According to an embodiment of the present disclosure, the oxygen concentration in the printing chamber is 300-5000 ppm.

[0045] According to an embodiment of the present disclosure, the thickness of the oxide layer is greater than or equal to 10 nm.

[0046] According to an embodiment of the present disclosure, the step of using the metal additive manufacturing process to form the in-situ oxidized alloy raw material powder into an oxide-strengthened metal material includes: using the metal additive manufacturing process to break the oxide layer formed on the surface of the alloy raw material powder; and the O in the oxide layer combines with the second chemical component to form fine and dispersed oxides to strengthen the metal material, thereby obtaining an oxide-strengthened metal material.

[0047] According to an embodiment of the present disclosure, the size of the oxides is 1-10 nm, preferably, the size of the oxides is 1-3 nm.

[0048] It should be noted that the oxides in the finally obtained oxide-strengthened metal material are not introduced in the initial oxidation process, but are generated by subsequent reactions. The existence of the reaction process can reorganize the oxides, refine the large particle oxides, and play a role in refining the oxides.

[0049] During the powder making process, it is very difficult to achieve uniform oxidation of the powder, and it is very likely that different amounts of oxides are formed in the powder at different positions. After the powder is oxidized, it will inevitably cause the problem of poor fluidity, which affects the subsequent printing quality. Moreover, oxidizing during the powder making process will result in the formation of larger and more stable oxide particles in the powder, and finer and more dispersed oxides cannot be formed, and the performance enhancement effect is limited. However, the in-situ oxidation technology adopted in the embodiments of the present disclosure obtains alloy raw material powders that are fully uniform, so that there are more sites where the second chemical component contacts oxygen, which is equivalent to increasing the nucleation sites to further refine the oxides. Since the in-situ oxidation is carried out after the powder is spread, there is no need to consider the change in the fluidity of the powder after oxidation, and the oxidation has no effect on the printing quality. At the same time, since the powder has been spread out, it is not restricted by the fluidity of the powder after oxidation. It is precisely because the powder has been spread out that this layer of powder can be in full contact with the gas atmosphere, and the conditions of each powder are almost exactly the same, and the oxidation degree of each powder is also almost exactly the same. By controlling the oxidation process with a printer, it is more precise. The uniform oxide layer on the surface of each powder can ensure that the second chemical component in the powder can react more uniformly with the oxide layer, thereby generating finer and more dispersed oxides. Further reduce the oxide size. In addition, since the oxide layer is on the surface of the alloy raw material powder and is directly affected by the laser, the energy barrier for the oxide layer to participate in the reaction is greatly reduced. Compared with oxide particles, the reaction is more uniform, further refining the oxides.

[0050] According to an embodiment of the present disclosure, the O content of the oxide is 0.05-0.5%.

[0051] According to an embodiment of the present disclosure, the first chemical component and the second chemical component are each a different one of Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu. Among them, the first chemical component is used to combine with O in the printing chamber before the alloy powder melts to form the oxide layer, and the second chemical component and other elements that are more likely to combine with oxygen are used to break the oxide layer in situ to form fine and dispersed oxides during the subsequent forming process. Any active element that is easy to combine with oxygen elements can be used to prepare oxide dispersion strengthened metal materials by this preparation method, and the embodiments of the present disclosure do not limit this.

[0052] According to an embodiment of the present disclosure, the first chemical component is Fe and the second chemical component is Ti. Taking Fe-0.27Ti-9Cr-1W as an example, where Fe is the first chemical component and Ti is the second chemical component. Fe is in-situ oxidized with O to form an initial oxide layer with a thickness of 50 nm - 200 nm. And Ti, as a more active oxygen-active element than Fe, reacts with the oxide of Fe under the action of laser to in-situ generate very fine and dispersed titanium oxides.

[0053] According to an embodiment of the present disclosure, the chemical components of the oxide layer include Fe and O, and the chemical components of the oxide include Ti and O.

[0054] According to an embodiment of the present disclosure, before the step of in-situ oxidizing the alloy raw material powder, it further includes: preparing the alloy raw material powder according to the component ratio of the metal material by using vacuum atomization powder making technology and / or rotating electrode technology.

[0055] Optionally, in an embodiment of the present disclosure, the particle size of the raw material powder is 15 - 53 μm, D50 is 36 μm, the sphericity > 90%, the fluidity < 20 s, and the loose bulk density > 4.1 g / cm3.

[0056] According to an embodiment of the present disclosure, the metal additive manufacturing technology is any one of selective laser melting technology, laser direct deposition, and selective electron beam melting technology.

[0057] Optionally, in an embodiment of the present disclosure, the parameters of the additive manufacturing process are: the laser power is 180 - 220 W, the scanning speed is 700 - 1000 mm / s, the scanning spacing is 80 - 120 μm, the layer thickness is 30 μm, the rotation angle is 67°, and the scanning strategy is the stripe mode.

[0058] The method for preparing the metal material provided by the present disclosure does not require pre-mixing oxides into the alloy powder in advance, nor does it require pre-treatment of the powder, greatly reducing the time cost. It only needs to control the printing process to oxidize the alloy powder, simplifying the preparation process of the ODS metal material, reducing the preparation cost, and improving the preparation quality. The method for preparing the metal material provided by the present disclosure can prepare parts with complex structures without mechanical processing by using additive manufacturing, enabling the ODS metal material to be prepared in large quantities with high quality and freely formed.

[0059] Another aspect of the present disclosure provides an oxide-strengthened metal material prepared by the above method. The size of the oxide in the obtained oxide-strengthened metal material is 1 - 10 nm, and preferably, the size of the oxide is 1 - 3 nm.

[0060] According to an embodiment of the present disclosure, the O content of the oxide is 0.05 - 0.5%.

[0061] According to an embodiment of the present disclosure, the chemical components of the oxide include at least one of Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu.

[0062] Exemplarily, taking low activation steel as an example, the strength of the sample obtained by this method at 600 °C is 930 MPa, and the performance is improved by more than 150% compared with ordinary 3D printed low activation steel, comparable to ODS low activation steel prepared by traditional methods, and the forming quality and cost are better than traditional methods.

[0063] For the metal material strengthened by the oxide provided by the present disclosure, the size of the oxide is 1 - 10 nm, the forming density reaches more than 99.8%, its mechanical properties and service time under extreme conditions are optimized. On the one hand, it can avoid the formation of M23C6 phase in traditional ODS metal materials, and on the other hand, the microstructure and mechanical properties are comparable to traditional ODS metal materials, with a higher density of precipitated phases and higher mechanical properties.

[0064] Hereinafter, the preparation method of the metal material of the present disclosure and the metal material strengthened by the oxide will be described in detail in conjunction with examples and related experiments.

[0065] Example 1

[0066] In terms of mass percentage, the ODS metal material of this example is an ODS alloy steel, and its elemental composition is: Cr: 8.90%, W: 0.82%, Mn: 0.23%, Si: 0.086%, Ti: 0.27%, C: 0.075%, Fe: bal.

[0067] The ODS steel of this example is prepared through the following process:

[0068] Step 1: Through vacuum atomization powder preparation technology, melt the elemental raw materials of Fe, Cr, W, Mn, V, Ti, C, and Si according to the elemental formula to obtain powders suitable for additive manufacturing;

[0069] Step 2: The powder obtained in Step 1 is subjected to a forming process using an slm280 device through additive manufacturing technology. The laser rapidly solidifies and melts the swept powder along a set path. Among them, the laser parameters are as follows: laser power: 200W, scanning speed: 600mm / s, scanning spacing: 120μm, layer thickness: 30μm, rotation angle: 67°, and the scanning strategy is the stripe mode. During the printing process, measures such as controlling the oxygen concentration in the printing chamber to 500ppm are adopted to promote the oxidation of the powder before melting, with a large amount of oxygen elements adsorbed on the surface, forming an oxide layer of more than dozens of nanometers.

[0070] Step 3: The sample obtained in Step 2 is cut from the substrate and subjected to microstructure characterization and mechanical property testing.

[0071] As Figure 2-3 shown, Figure 2 is the diffraction spot of the central dark field pattern set, Figure 3 and the corresponding precipitated phase. It can be seen that the matrix of the sample obtained in Step 3 contains a large number of fine and dispersed oxide 1 precipitated phases with a size of 1 - 3nm, and the element composition is Ti and O.

[0072] As Figure 4 shown, the microstructure of the sample obtained in Step 3 is ultrafine-grained ferrite 2, and the average grain size is 1 - 2um. This is due to the grain refinement effect of the fine and dispersed oxide particles.

[0073] As Figure 5 shown, the powder in Step 2 can be oxidized before melting, with a large amount of oxygen elements adsorbed on the surface, forming an oxide layer 3 of more than 50 - 100 nanometers. Among them, the element composition of the oxide layer is Fe and O.

[0074] The tensile test results of the sample in Example 1 are as follows: tensile strength at room temperature is 1200MPa, elongation is 18%, tensile strength at 600°C is 930MPa, and fracture elongation is 14%.

[0075] Those skilled in the art can understand that the features recited in the various embodiments and / or claims of the present disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly recited in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features recited in the various embodiments and / or claims of the present disclosure can be combined and combined in various ways. All such combinations and / or combinations fall within the scope of the present disclosure.

[0076] The embodiments of the present disclosure have been described above. However, these embodiments are merely for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments have been described separately above, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art can make various substitutions and modifications, and these substitutions and modifications should fall within the scope of the present disclosure.

Claims

1. A method for preparing a metal material, characterized in that, The preparation method adopts a metal additive manufacturing process, including: In the printing chamber of the metal additive manufacturing process, in-situ oxidation of the alloy raw material powder is carried out; and The in-situ oxidized alloy raw material powder is subjected to a forming process by using a metal additive manufacturing process to obtain an oxide-strengthened metal material.

2. The method according to claim 1, wherein The chemical components of the alloy raw material powder include at least a first chemical component and a second chemical component. Among them, the oxidizing property of the first chemical component is less than that of the second chemical component. The first chemical component is used for in-situ oxidation to form an oxide layer, and the second chemical component is used to destroy the oxide layer and combine with the oxygen in the oxide layer to form an oxide for strengthening the metal material.

3. The method according to claim 2, characterized in that, The step of carrying out in-situ oxidation of the alloy raw material powder in the printing chamber of the metal additive manufacturing process includes: Controlling the oxygen concentration in the printing chamber, carrying out in-situ oxidation of the first chemical component in the alloy raw material powder, and forming the oxide layer on the surface of the alloy raw material powder.

4. The method according to claim 3, characterized in that, The oxygen concentration in the printing chamber is 300 - 5000 ppm.

5. The method according to claim 3, characterized in that, The thickness of the oxide layer is greater than or equal to 10 nm.

6. The method according to claim 3, wherein The step of subjecting the in-situ oxidized alloy raw material powder to a forming process by using a metal additive manufacturing process to obtain an oxide-strengthened metal material includes: Using a metal additive manufacturing process to destroy the oxide layer formed on the surface of the alloy raw material powder; and The O in the oxide layer combines with the second chemical component to form fine and dispersed oxides to strengthen the metal material, thereby obtaining an oxide-strengthened metal material.

7. The method according to claim 6, wherein The size of the oxide is 1 - 10 nm.

8. The method according to claim 6, characterized in that, The O content of the oxide is 0.05 - 0.5%.

9. The method according to claim 2, wherein The first chemical component and the second chemical component are each a different one selected from Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu.

10. The method according to claim 9, wherein The first chemical component is Fe, and the second chemical component is Ti.

11. The method according to claim 10, wherein, The chemical components of the oxide layer include Fe and O, and the chemical components of the oxide include Ti and O.

12. The method according to claim 1, characterized in that, Before the step of carrying out in-situ oxidation of the alloy raw material powder, it further includes: Preparing the alloy raw material powder according to the composition ratio of the metal material by using a vacuum atomization powder preparation technology and / or a rotating electrode technology.

13. The method according to claim 1, characterized in that, The metal additive manufacturing technology is any one of a selective laser melting technology, a laser direct deposition, and a selective electron beam melting technology.

14. An oxide-strengthened metallic material prepared by the method according to any one of claims 1-13, characterized in that, The size of the oxide in the obtained oxide-strengthened metal material is 1 - 10 nm.

15. The metallic material according to claim 14, characterized in that, The O content of the oxide is 0.05 - 0.5%.

16. The metallic material according to claim 15, characterized in that, The chemical components of the oxide include at least one of Ti, Al, Y, Zr, Mg, Si, Mn, Fe, Ni, Ca, V, Cr, Hf, Mo, Ta, Nb, W, Zn, Sc, Co, and Cu.

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