Powder metallurgy material and preparation method

Abstract

The invention discloses a powder metallurgy material and a preparation method, relates to the field of material heat treatment, and aims to solve the problem that the hardness and wear resistance of a powder metallurgy material prepared by an existing process are difficult to meet the requirements in the fields of aerospace and the like. The powder metallurgy material comprises basic components (Si, Mn, S, P, Cr and C) and trace components (W is smaller than or equal to 0.5% by mass, 1.1-1.5% by mass of Mo, 9.25-10.25% by mass of V and smaller than or equal to 0.5% by mass of Co). The preparation method comprises the following steps: tempering a powder metallurgy material, and then carrying out two-stage nitriding (the first stage is 520 + / -5 DEG C heat preservation for 5 hours and the nitrogen potential is 12.5 + / -2, and the second stage is 550 + / -5 DEG C heat preservation for 50 hours and the nitrogen potential is 0.6 + / -0.1); the nitriding surface hardness of the prepared material reaches HV1030, the nitriding layer depth is 0.4 mm, the brittleness level I is achieved, and the material has high hardness and high abrasion resistance, can prolong the service life of parts, is suitable for aviation parts and can also be popularized to other powder metallurgy, structural steel and stainless steel gas nitriding processes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material heat treatment, in particular to a powder metallurgy material and a preparation method. BACKGROUND

[0002] The powder metallurgy material is widely used in the automobile, household goods, equipment manufacturing industry, and is gradually replacing the cast iron material with low strength, low density and low hardness, and with the continuous improvement of the powder metallurgy material technology, it has a very broad prospect in high-precision parts. Among them, the heat treatment process level of the powder metallurgy material is one of the main problems causing the difference in physical properties of the powder metallurgy material. In order to expand the application of the powder metallurgy material, effective measures must be taken to improve the heat treatment process level and improve the performance of the powder metallurgy material.

[0003] With the development of national economy, the research and application of powder metallurgy material in chemical heat treatment has become a hot spot pursued by scholars at home and abroad. The chemical treatment of powder metallurgy material includes multi-element co-permeation, nitriding, carburizing, sulfurizing and other ways. In the process of chemical treatment, the hardening depth of the material has a great relationship with the density of the material, so corresponding measures should be taken in the process of heat treatment of powder metallurgy material, such as adopting appropriate extension time for treatment, so as to better improve the hardness and wear resistance of the material. The existing nitriding process of structural steel and stainless steel materials in China generally follows HB / Z 79-95 “Aircraft Structural Steel and Stainless Steel Nitriding Process Specification”. The rapid development of aerospace, automobile manufacturing and other fields puts forward higher requirements for the performance of powder metallurgy material. The hardness and wear resistance of the powder metallurgy material prepared by the existing process are difficult to meet the requirements. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a powder metallurgy material and a preparation method, which adopts two-stage nitriding process to make the powder metallurgy parts have high hardness and high wear resistance, and prolong the service life of the parts.

[0005] The present application is realized by the following technical solutions:

[0006] A preparation method of a powder metallurgy material, comprising the following steps:

[0007] Step 1, quenching and tempering the powder metallurgy material;

[0008] Step 2, two-stage nitriding the powder metallurgy material obtained in step 1 to obtain the final powder metallurgy material;

[0009] The first-stage nitriding temperature is 520±5℃, the holding time is 5h, and the nitrogen potential Kn=12.5±2;

[0010] The nitriding temperature of the second section is 550±5℃, the holding time is 50h, and the nitrogen potential Kn is 0.6±0.1.

[0011] Preferably, the method for quenching and tempering the powder metallurgy material is as follows:

[0012] First, the powder metallurgy material is vacuum quenched;

[0013] Then, the quenched powder metallurgy material is vacuum tempered for three times to obtain the quenched and tempered powder metallurgy material.

[0014] Preferably, the method for vacuum quenching the powder metallurgy material is as follows:

[0015] First, the temperature is raised to 500-550℃ at a rate of ≤10℃ / min, and preheated for 50-60min;

[0016] Then, the temperature is raised to 800-850℃ at a rate of ≤10℃ / min, and preheated for 50-60min;

[0017] Secondly, the temperature is raised to 1070±10℃ at a rate of ≤10℃ / min, and held for 60-90min;

[0018] Finally, the powder metallurgy material is cooled to room temperature.

[0019] Preferably, the cooling method is oil cooling.

[0020] Preferably, the method for vacuum tempering the powder metallurgy material for three times is as follows:

[0021] First tempering: the temperature is raised to 550±10℃ at a rate of ≤10℃ / min, and held for 2-2.5h;

[0022] Second tempering: the temperature is raised to 650±10℃ at a rate of ≤10℃ / min, and held for 2-2.5h;

[0023] Third tempering: the temperature is raised to 650±10℃ at a rate of ≤10℃ / min, and held for 2-2.5h;

[0024] Preferably, after each holding time, the powder metallurgy material is air cooled to room temperature.

[0025] Preferably, the vacuum degree of the quenching and tempering is 13.3-0.0133Pa.

[0026] A powder metallurgy material, comprising a base component and a trace component;

[0027] The base component comprises Si, Mn, S, P, Cr and C;

[0028] Trace elements include, by mass fraction: W ≤ 0.5%, Mo 1.1-1.5%, V 9.25-10.25%, Co ≤ 0.5%.

[0029] Preferably, Si 0.75-1.1%, Mn 0.28-0.6%, S ≤ 0.03%, P ≤ 0.03%, Cr 4.75-4.6, C 2.2-2.55%.

[0030] Application of a powder metallurgy material to an aeronautical component.

[0031] Compared with the prior art, the present application has the following beneficial technical effects:

[0032] The powder metallurgy material preparation method provided by the present application has the core advantages of innovatively adopting a two-stage nitriding process, and the material performance is significantly improved by precisely controlling the process parameters in each stage. In the first stage, the process conditions are 520±5℃ for 5h and nitrogen potential Kn=12.5±2, which can quickly form an initial nitriding layer on the surface of the material, laying a foundation for subsequent performance optimization; in the second stage, the parameter settings are 550±5℃ for 50h and nitrogen potential Kn=0.6±0.1, which can promote the depth and uniform diffusion of the nitriding elements, and ensure the quality of the nitriding layer. The powder metallurgy material treated by this process has a nitriding surface hardness of HV1030, which is much higher than the requirement of HV≥800 for conventional materials specified by the aviation standard, and the nitriding layer depth reaches 0.4mm and the brittleness is grade I, greatly improving the hardness and wear resistance of the part and effectively prolonging the service life. At the same time, this process breaks through the limitations of the original nitriding material process in performance and application range, and is not only suitable for specific powder metallurgy materials, but also provides a reference for the optimization of gas nitriding processes for other similar materials, improves the applicability of the gas nitriding process, and meets the demand for high-precision and high-performance parts in the field of aviation and other fields. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Fig. 1 The microstructure diagram of the powder metallurgy material of the present application;

[0035] Fig. 2 The microstructure diagram of the powder metallurgy material of the present application after quenching and tempering;

[0036] Fig. 3 The brittleness diagram of the powder metallurgy material of the present application. DETAILED DESCRIPTION

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0039] A powder metallurgy material, comprising a base component and a trace component;

[0040] The base component comprises Si, Mn, S, P, Cr and C;

[0041] The trace component comprises, in terms of mass fraction: W≤0.5%, Mo 1.1-1.5%, V 9.25-10.25%, Co≤0.5%.

[0042] The base component comprises Si, Mn, S, P, Cr and C;

[0043] The powder metallurgy material is formed by adding the trace component (W, Mo, V, Co) to form carbides (C6, W2C, Mo2C, Fe3W3C, Fe3Mo3C and VC) in the powder metallurgy material to improve the hardness and wear resistance of the powder metallurgy material. 23 C6, W2C, Mo2C, Fe3W3C, Fe3Mo3C and VC to improve the hardness and wear resistance of the powder metallurgy material.

[0044] The Cr in the base component improves the hardenability and temper resistance of the steel, and increases the oxidation resistance, decarburization resistance and corrosion resistance of the steel; the W and Mo not only improve the hardenability, but more importantly, improve the temper resistance and hot hardness of the steel, the martensite with a large amount of W and Mo has high temper resistance, and the special carbides (W2C and Mo2C) precipitated at the tempering temperature of 500-600C also produce secondary hardening to keep the part high red hardness; the main role of V is to form fine VC with high hardness to improve the hardness and hot hardness of the steel, and refine the grains.

[0045] Correspondingly, the present application also provides a preparation method of the powder metallurgy material, comprising the following steps:

[0046] Step 1, quenching and tempering the powder metallurgy material;

[0047] It should be noted that the powder metallurgy material is a powder metallurgy material prepared by a powder metallurgy preparation process, which can also be understood as a powder metallurgy workpiece. The powder metallurgy preparation process includes gas atomization powdering, canning, hot isostatic pressing (HIP) to press the powder metallurgy steel blank, and then rolling to process the powder metallurgy material.

[0048] Step 2, two-stage nitriding of the powder metallurgy material obtained in step 1 to obtain the final powder metallurgy material;

[0049] The first-stage nitriding temperature is 520±5℃, the holding time is 5h, and the nitrogen potential Kn=12.5±2;

[0050] The second-stage nitriding temperature is 550±5℃, the holding time is 50h, and the nitrogen potential Kn=0.6±0.1.

[0051] During the nitriding process, the four trace elements (W, Mo, V, and Co) play a key role in improving the nitriding metallographic structure and increasing the surface hardness of nitriding: first, the four trace elements (W, Mo, V, and Co) can strongly react with O, H, and N, especially with O. Second, trace elements are accompanied by N atoms penetrating into the metal surface at a certain temperature, with trace solid solution characteristics. Since the atomic radius of some trace elements is much larger than that of Fe atoms, the presence of these trace elements will cause distortion of the atomic lattice around them. This lattice distortion produces the following effects: on the one hand, the concentration of C and N interstitial atoms increases in the distortion zone, accelerating the diffusion of C and N atoms; on the other hand, the crystal defects act as channels for atomic diffusion, promoting the rapid diffusion of interstitial atoms along the distortion zone such as dislocations.

[0052] In some embodiments, the method of quenching and tempering the powder metallurgy material is as follows:

[0053] First, vacuum quenching the powder metallurgy material;

[0054] Place the powder metallurgy material in a vacuum furnace body, and heat it to 500-550℃ at a rate of ≤10℃ / min, preheat for 50-60 minutes; then heat it to 800-850℃ at a rate of ≤10℃ / min, preheat for 50-60 minutes; then heat it to 1070±10℃ at a rate of ≤10℃ / min, hold for 60-90 minutes, and finally oil cooling.

[0055] The vacuum degree of the vacuum furnace body is 13.3-0.0133Pa.

[0056] Then, three times of tempering the quenched powder metallurgy material to obtain the quenched and tempered powder metallurgy material.

[0057] First tempering: heating to 550±10℃ at a rate of ≤10℃ / min, holding for 2-2.5 hours, and air cooling to room temperature. Vacuum: 13.3-0.0133 Pa.

[0058] Second tempering: heating to 650±10℃ at a rate of ≤10℃ / min, holding for 2-2.5 hours, and air cooling to room temperature. Vacuum: 13.3-0.0133 Pa.

[0059] Third tempering: heating to 650±10℃ at a rate of ≤10℃ / min, holding for 2-2.5 hours, and air cooling to room temperature. Vacuum: 13.3-0.0133 Pa.

[0060] After quenching and tempering, the powder metallurgy material has uniform and consistent microstructure, no internal cracks, fine and dense carbides, WC phase (α), binder phase (β), uniform and fusion trend, and interconnected pores. Due to the characteristics of containing four trace elements (W, Mo, V, and Co), the part has high hardness, and has uniform hard phase, soft phase, and pores.

[0061] After quenching and three times of tempering, the powder metallurgy material has uniform and consistent microstructure, no internal cracks, fine and dense carbides, WC phase (α), binder phase (β), uniform and fusion trend, and interconnected pores. Due to the characteristics of containing four trace elements (W, Mo, V, and Co), the part has high hardness, and has uniform hard phase, soft phase, and pores.

[0062] Example 1

[0063] A method for preparing a powder metallurgy material, comprising the following steps:

[0064] Step 1, quenching and tempering the powder metallurgy material, wherein the powder metallurgy material is HOP10V powder metallurgy material.

[0065] First, vacuum quenching the powder metallurgy material;

[0066] Placing the powder metallurgy material in a vacuum quenching furnace at 13.3 Pa, heating to 500℃ at a rate of 10℃ / min, preheating for 50 minutes, then heating to 800℃ at a rate of 10℃ / min, preheating for 50 minutes, then heating to 1060℃ at a rate of 10℃ / min, holding for 60 minutes, and finally oil cooling.

[0067] Then, vacuum tempering the quenched powder metallurgy material three times to obtain the quenched and tempered powder metallurgy material, and the vacuum degree is 13.3 Pa.

[0068] First tempering: heating to 540℃ at a rate of 10℃ / min, holding for 2 hours, and air cooling to room temperature.

[0069] Second tempering: heating up to 640℃ at a rate of 10℃ / min, holding for 2 hours, and air cooling to room temperature.

[0070] Third tempering: heating up to 640℃ at a rate of 10℃ / min, holding for 2 hours, and air cooling to room temperature.

[0071] Step 2, carrying out two-stage nitriding on the powder metallurgy material obtained in Step 1 to obtain a final powder metallurgy material;

[0072] The first-stage nitriding temperature is 515℃, holding for 5h, and the nitrogen potential Kn=12.3;

[0073] The second-stage nitriding temperature is 545℃, holding for 50h, and the nitrogen potential Kn=0.5.

[0074] Example 2

[0075] A method for preparing a powder metallurgy material, comprising the following steps:

[0076] Step 1, quenching and tempering the powder metallurgy material;

[0077] Firstly, vacuum quenching the powder metallurgy material;

[0078] Placing the powder metallurgy material in a vacuum quenching furnace at 10Pa, heating up to 520℃ at a rate of 20℃ / min, preheating for 55min; then heating up to 800℃ at a rate of 15℃ / min, preheating for 52min; then heating up to 1070℃ at a rate of 20℃ / min, holding for 65min, and finally oil cooling.

[0079] Then, vacuum tempering the quenched powder metallurgy material three times to obtain a quenched and tempered powder metallurgy material, and the vacuum degree is 13.3Pa.

[0080] First tempering: heating up to 550℃ at a rate of 15℃ / min, holding for 2.2 hours, and air cooling to room temperature.

[0081] Second tempering: heating up to 650℃ at a rate of 20℃ / min, holding for 2.2 hours, and air cooling to room temperature.

[0082] Third tempering: heating up to 650℃ at a rate of 30℃ / min, holding for 2.2 hours, and air cooling to room temperature.

[0083] Step 2, carrying out two-stage nitriding on the powder metallurgy material obtained in Step 1 to obtain a final powder metallurgy material;

[0084] The first-stage nitriding temperature is 520℃, holding for 5h, and the nitrogen potential Kn=12.5;

[0085] The nitriding temperature of the second section is 550℃, the holding time is 50h, and the nitrogen potential Kn=0.5.

[0086] Example 3

[0087] A method for preparing a powder metallurgy material, comprising the following steps:

[0088] Step 1, quenching and tempering the powder metallurgy material;

[0089] First, vacuum quenching the powder metallurgy material;

[0090] The powder metallurgy material is placed in a vacuum quenching furnace with a vacuum degree of 10Pa, and the furnace is heated to 550℃ at a rate of 25℃ / min, preheated for 60min; then heated to 800℃ at a rate of 20℃ / min, preheated for 60min; then heated to 1080℃ at a rate of 30℃ / min, held for 90min, and finally oil-cooled.

[0091] Then, the quenched powder metallurgy material is vacuum tempered three times to obtain the quenched and tempered powder metallurgy material, and the vacuum degree is 13.3Pa.

[0092] First tempering: the furnace is heated to 560℃ at a rate of 30℃ / min, held for 2.5h, and air-cooled to room temperature.

[0093] Second tempering: the furnace is heated to 660℃ at a rate of 40℃ / min, held for 2.5h, and air-cooled to room temperature.

[0094] Third tempering: the furnace is heated to 660℃ at a rate of 50℃ / min, held for 2.5h, and air-cooled to room temperature.

[0095] Step 2, two-stage nitriding of the powder metallurgy material obtained in step 1 to obtain the final powder metallurgy material;

[0096] The nitriding temperature of the first section is 525℃, the holding time is 5h, and the nitrogen potential Kn=12.7;

[0097] The nitriding temperature of the second section is 555℃, the holding time is 50h, and the nitrogen potential Kn=0.7.

[0098] Example 4

[0099] A method for preparing a powder metallurgy material, comprising the following steps:

[0100] Step 1, quenching and tempering the powder metallurgy material;

[0101] First, vacuum quenching the powder metallurgy material;

[0102] The powder metallurgy material is placed in a vacuum quenching furnace at 10 Pa, and is heated at a rate of 25 °C / min to 530 °C, preheated for 50 min; then heated at a rate of 20 °C / min to 840 °C, preheated for 56 min; then heated at a rate of 30 °C / min to 1075 °C, and held for 80 min, and finally oil-cooled.

[0103] Then, the quenched powder metallurgy material is vacuum tempered three times to obtain a quenched and tempered powder metallurgy material, and the vacuum degree is 13.3 Pa.

[0104] First tempering: heated at a rate of 30 °C / min to 553 °C, held for 2.3 h, and air-cooled to room temperature.

[0105] Second tempering: heated at a rate of 40 °C / min to 660 °C, held for 2.2 h, and air-cooled to room temperature.

[0106] Third tempering: heated at a rate of 50 °C / min to 655 °C, held for 2.4 h, and air-cooled to room temperature.

[0107] Step 2, the powder metallurgy material obtained in step 1 is subjected to two-stage nitriding to obtain a final powder metallurgy material;

[0108] The first-stage nitriding temperature is 523 °C, the holding time is 5 h, and the nitrogen potential Kn is 12.7;

[0109] The second-stage nitriding temperature is 555 °C, the holding time is 50 h, and the nitrogen potential Kn is 0.7.

[0110] Reference Figs. 1-3 The powder metallurgy materials prepared in Examples 1-4 are detected, the nitriding layer thickness is 0.4 mm, the hardness is HV1030, the brittleness is I, and the entire material surface is uniformly black. Therefore, after the powder metallurgy material prepared by the above preparation method is quenched and tempered, and then subjected to gas nitriding, the gas nitriding processing part reaches the requirements in terms of nitriding layer, surface hardness, brittleness and appearance, and the results are stable.

[0111] The powder metallurgy material of Example 1 is compared with the powder metallurgy material processed by the structure steel and stainless steel process specified by the navigation mark, and the comparison results are shown in Table 1.

[0112]

[0113]

[0114] The preparation method of the application is compared with the gas nitriding process stipulated by the navigation mark, the temperature, holding time and nitrogen potential control of the two-stage nitriding are all different, and the performance is better. In the nitriding process, the four trace elements (W, Mo, V and Co) play a key role in improving the nitriding metallographic structure and increasing the surface hardness of the nitriding. The specific comparison is as follows:

[0115] A. 4Cr14Ni14W2Mo stainless steel material, according to the stipulation of HB / Z79-95, the nitriding layer depth reaches 0.1mm, the surface hardness is HV959, and the brittleness is grade II. The process is that the first stage temperature is 545±5℃, the holding time is 30h, and the decomposition rate is 45-55%; the second stage temperature is 565±5℃, the holding time is 20h, and the decomposition rate is 55-65%. The strong nitriding time of the first stage is longer than the diffusion time of the second stage, the strong nitriding temperature is different from the diffusion temperature by 20℃, the nitriding layer, surface hardness, brittleness and structure are all normal;

[0116] B. 25Cr3MoA structural steel material, according to the stipulation of HB / Z79-95, the nitriding layer depth reaches 0.3mm, the surface hardness is HV880, and the brittleness is grade II. The process is that the first stage temperature is 500±5℃, the holding time is 16h, and the decomposition rate is 20-30%; the second stage temperature is 540±5℃, the holding time is 20h, and the decomposition rate is 35-50%. The strong nitriding time of the first stage is close to the diffusion time of the second stage, the strong nitriding temperature is different from the diffusion temperature by 40℃, the nitriding layer, surface hardness, brittleness and structure are all normal;

[0117] C. HOP10V powder metallurgy material, there is no process parameter of the material in HB / Z79-95, the process is that the first stage temperature is 520±5℃, the holding time is 5h, and Kn=12.5±2; the second stage temperature is 550±5℃, the holding time is 50h, and Kn=0.6±0.1. The strong nitriding time of the first stage is shorter than the diffusion time of the second stage, the nitrogen potential of the two stages is accurately controlled at 12.5 and 0.6 respectively, the strong nitriding temperature is different from the diffusion temperature by 30℃, the result shows that the nitriding structure has no net-like nitride, which shows that it is qualified; the nitriding layer depth reaches 0.4mm, which is the effect of long diffusion time; the hardness is HV1030, and the brittleness is grade I. The surface hardness of the application is higher than that of the methods A and B, and the brittleness is also better.

[0118] The application of a powder metallurgy material in an aviation component.

[0119] The preparation method of the present application can be popularized to other powder metallurgy, structural steel and stainless steel material (for example, 1Cr11Ni2W2MoV, 1Cr12Ni2WMoVNb, etc.) gas nitriding process, the nitrogen potential is accurately controlled, the performance of the diffusion layer and the surface hardness is improved, the processed parts achieve excellent performance of high hardness and high wear resistance, the service life of the parts is prolonged, the performance requirements of the products are met, the original nitriding material process is broken, and the applicability of the gas nitriding process is improved.

[0120] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A method for producing a powder metallurgical material, characterized in that, It comprises the following steps: Step 1, quenching and tempering the powder metallurgy material; Step 2, two-stage nitriding the powder metallurgy material obtained in Step 1 to obtain the final powder metallurgy material; The first-stage nitriding temperature is 520±5℃, the holding time is 5h, and the nitrogen potential Kn=12.5±2; The second-stage nitriding temperature is 550±5℃, the holding time is 50h, and the nitrogen potential Kn=0.6±0.

1.

2. The method of claim 1, wherein The method for quenching and tempering the powder metallurgy material is as follows: First, vacuum quenching the powder metallurgy material; Then, vacuum tempering the quenched powder metallurgy material three times to obtain the quenched and tempered powder metallurgy material.

3. The method of claim 2, wherein the powder metallurgy material is prepared by a method comprising: The method for vacuum quenching the powder metallurgy material is as follows: First, heating the powder metallurgy material to 500-550℃ at a rate of ≤10℃ / min, and preheating for 50-60min; Then, heating the powder metallurgy material to 800-850℃ at a rate of ≤10℃ / min, and preheating for 50-60min; Second, heating the powder metallurgy material to 1070±10℃ at a rate of ≤10℃ / min, and holding for 60-90min; Finally, cooling the powder metallurgy material to room temperature.

4. The method of claim 3, wherein the powder metallurgy material is prepared by a method comprising: The cooling method is oil cooling.

5. The method of claim 2, wherein the powder metallurgy material is prepared by a method comprising: The method for vacuum tempering the powder metallurgy material three times is as follows: First-time tempering: heating the powder metallurgy material to 550±10℃ at a rate of ≤10℃ / min, and holding for 2-2.5h; Second-time tempering: heating the powder metallurgy material to 650±10℃ at a rate of ≤10℃ / min, and holding for 2-2.5h; Third-time tempering: heating the powder metallurgy material to 650±10℃ at a rate of ≤10℃ / min, and holding for 2-2.5h.

6. The method of producing a powder metallurgical material according to claim 5, characterized in that After each holding, the powder metallurgy material is air-cooled to room temperature.

7. The method of claim 2, wherein the powder metallurgy material is prepared by a method comprising: The vacuum degree of the quenching and tempering is 13.3-0.0133Pa. ​ 8. A powder metallurgical material produced by the method according to any one of claims 1 to 7, characterized in that It comprises basic components and trace components; The basic components comprise Si, Mn, S, P, Cr and C; The trace components comprise, by mass fraction: W≤0.5%, Mo 1.1-1.5%, V 9.25-10.25%, Co≤0.5%.

9. The powder metallurgy material of claim 8, wherein, The basic components comprise, by mass fraction: Si 0.75-1.1%, Mn 0.28-0.6%, S≤0.03%, P≤0.03%, Cr 4.75-4.6, and C 2.2-2.55%.

10. The powder metallurgy material of claim 8 or 9 for use in an aeronautical component.

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