阅读说明：本技术 一种镍基高温合金及其制备方法 (Nickel-based high-temperature alloy and preparation method thereof ) 是由 周青春 罗晓芳 徐卫明 顾金才 于广文 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种镍基高温合金及其制备方法,具体涉及高温合金领域,其中各主要元素质量百分数分别为：铬Cr:2wt％-3.2wt％、钨W:4.8wt％-5wt％、钼Mo:0.2wt％-0.6wt％、钴Co:2.8wt％-4wt％、硅Si:0.5wt％-0.9wt％、铁Fe:12wt％-13.6wt％、铝A1:5.3wt％-6.4wt％、钛Ti:0.15wt％-0.3wt％、硼B:0.005wt％-0.01wt％、铌Nb:0.05wt％-0.15wt％、钽Ta:7.2wt％-9.6wt％、铪Hf:0.15wt％-0.28wt％、铬Cr:1.8wt％-2.4wt％,余量设置为镍Ni。本发明通过镍基合金中溶解较多合金元素,且能保持较好的组织稳定性；含铬的镍基合金具有比铁基高温合金更好的抗氧化和抗燃气腐蚀能力,从而提高制得的镍基高温合金的整体特性。(The invention discloses a nickel-based high-temperature alloy and a preparation method thereof, and particularly relates to the field of high-temperature alloys, wherein the nickel-based high-temperature alloy comprises the following main elements in percentage by mass: 2 to 3.2 weight percent of chromium Cr, 4.8 to 5 weight percent of tungsten W, 0.2 to 0.6 weight percent of molybdenum Mo, 2.8 to 4 weight percent of cobalt Co, 0.5 to 0.9 weight percent of silicon Si, 12 to 13.6 weight percent of ferrum Fe, 5.3 to 6.4 weight percent of aluminum A1, 0.15 to 0.3 weight percent of titanium Ti, 0.005 to 0.01 weight percent of boron B, 0.05 to 0.15 weight percent of niobium Nb, 7.2 to 9.6 weight percent of tantalum Ta, 0.15 to 0.28 weight percent of hafnium Hf, 1.8 to 2.4 weight percent of chromium Cr, and the balance of nickel Ni. The nickel-based alloy has the advantages that more alloy elements are dissolved in the nickel-based alloy, and the good structural stability can be kept; the chromium-containing nickel-based alloy has better oxidation resistance and fuel gas corrosion resistance than the iron-based high-temperature alloy, thereby improving the overall characteristics of the prepared nickel-based high-temperature alloy.)

1. A nickel-base superalloy, characterized by: wherein the mass percentages of the main elements are respectively as follows: 2 to 3.2 weight percent of chromium Cr, 4.8 to 5 weight percent of tungsten W, 0.2 to 0.6 weight percent of molybdenum Mo, 2.8 to 4 weight percent of cobalt Co, 0.5 to 0.9 weight percent of silicon Si, 12 to 13.6 weight percent of ferrum Fe, 5.3 to 6.4 weight percent of aluminum A1, 0.15 to 0.3 weight percent of titanium Ti, 0.005 to 0.01 weight percent of boron B, 0.05 to 0.15 weight percent of niobium Nb, 7.2 to 9.6 weight percent of tantalum Ta, 0.15 to 0.28 weight percent of hafnium Hf, 1.8 to 2.4 weight percent of chromium Cr, and the balance of nickel Ni.

2. The nickel-base superalloy as in claim 1, wherein: wherein the mass percentages of the main elements are respectively as follows: 2 wt% of Cr, 4.8 wt% of W, 0.2 wt% of Mo, 2.8 wt% of Co, 0.5 wt% of Si, 12 wt% of Fe, 5.3 wt% of Al 1, 0.15 wt% of Ti, 0.005 wt% of B, 0.05 wt% of Nb, 7.2 wt% of Ta, 0.15 wt% of Hf, 1.8 wt% of Cr, and the balance Ni.

3. The nickel-base superalloy as in claim 1, wherein: wherein the mass percentages of the main elements are respectively as follows: 2.6 wt% of Cr, 4.9 wt% of W, 0.4 wt% of Mo, 3.4 wt% of Co, 0.7 wt% of Si, 12.8 wt% of Fe, 5.85 wt% of Al A1, 0.23 wt% of Ti, 0.007 wt% of B, 0.1 wt% of Nb, 8.4 wt% of Ta, 0.21 wt% of Hf, 2.1 wt% of Cr, and the balance of Ni.

4. The nickel-base superalloy as in claim 1, wherein: wherein the mass percentages of the main elements are respectively as follows: 3.2 wt% of Cr, 5 wt% of W, 0.6 wt% of Mo, 4 wt% of Co, 0.9 wt% of Si, 13.6 wt% of Fe, 6.4 wt% of Al 1, 0.3 wt% of Ti, 0.01 wt% of B, 0.15 wt% of Nb, 9.6 wt% of Ta, 0.28 wt% of Hf, 2.4 wt% of Cr, and the balance of Ni.

5. The nickel-base superalloy according to any of claims 1 to 4, wherein: the preparation method of the nickel-based superalloy comprises the following specific steps:

s1, smelting to prepare powder: preparing high-temperature alloy powder by using a vacuum consumable furnace and adopting a vacuum induction smelting mode to carry out a gas smelting atomization method;

s2, forging and casting: increasing the temperature in the air induction furnace, smelting the alloy powder prepared in the step S1 by adopting forging and rolling processes, ensuring the control quantity of gas and the impurity content during smelting the alloy components, and preparing a part blank by using a vacuum remelting-precision casting method;

s3, heat treatment: carrying out solution treatment, intermediate treatment and aging treatment on the part blank prepared in the step S2;

s4, surface treatment: residual compressive stress is introduced into the metal surface layer through shock waves induced by strong laser to carry out surface modification.

6. The method of claim 5, wherein the nickel-base superalloy is prepared by: in the step S3, the solution treatment temperature is set to 1150-1200 ℃, the treatment time is set to 1.5-2.5h, and then the solution is naturally cooled to room temperature.

7. The method of claim 5, wherein the nickel-base superalloy is prepared by: the intermediate treatment temperature in the step S3 is set to 1050-.

8. The method of claim 5, wherein the nickel-base superalloy is prepared by: the aging treatment in the step S3 comprises a primary aging treatment and a secondary aging treatment, wherein the temperature of the primary aging treatment is set to 820-.

Technical Field

The invention relates to the technical field of high-temperature alloys, in particular to a nickel-based high-temperature alloy and a preparation method thereof.

Background

The high-temperature alloy is an alloy which takes iron, nickel and cobalt as bases, is in service in a high-temperature environment, can bear severe mechanical stress and has good surface stability. Superalloys generally have high room temperature and high temperature strength, good oxidation and hot corrosion resistance, excellent creep and fatigue resistance, good structural stability, and reliability in use. Therefore, the high-temperature alloy is not only a key material for high-temperature components of aviation and aerospace engines, but also an indispensable important material in the industrial fields of ships, energy sources, petrochemical industry and the like, and becomes one of important marks for measuring the development level of national materials. In the whole field of high-temperature alloys, nickel-based high-temperature alloys take a particularly important position. Compared with iron-based and cobalt-based high-temperature alloys, the nickel-based high-temperature alloy has higher high-temperature strength and structural stability, and is widely applied to manufacturing hot end components of aviation jet engines and industrial gas turbines. Modern gas turbine engines use more than 50% by mass of the material as a superalloy, with the amount of nickel-based superalloy accounting for about 40% of the engine material. Nickel-based alloys have an excellent combination of properties at medium and high temperatures, are suitable for long term operation at high temperatures, are resistant to corrosion and erosion, are the most complex alloys, are most widely used in high temperature components, and are of great interest to many metallurgists in all superalloys. The nickel-based high-temperature alloy is mainly used for structural parts working at the temperature of 950-.

The nickel-based high-temperature alloy refers to a high-temperature alloy which takes nickel as a matrix (the content is generally more than 50 percent) and has higher strength and good oxidation resistance and fuel gas corrosion resistance in the range of 650-1000 ℃. Although the existing nickel-based alloy has better hot corrosion resistance, the nickel-based superalloy in the prior art cannot meet the use requirement along with the higher and higher high temperature resistance requirement of various industries on the high temperature resistant alloy, and the nickel-based superalloy with higher temperature resistance needs to be prepared to meet the use requirement.

Disclosure of Invention

In order to overcome the above defects in the prior art, embodiments of the present invention provide a nickel-based superalloy and a method for preparing the same, and the present invention aims to solve the following technical problems: how to prepare the nickel-based high-temperature alloy which can resist higher temperature to meet the use requirement.

In order to achieve the purpose, the invention provides the following technical scheme: the nickel-based high-temperature alloy comprises the following main elements in percentage by mass: 2 to 3.2 weight percent of chromium Cr, 4.8 to 5 weight percent of tungsten W, 0.2 to 0.6 weight percent of molybdenum Mo, 2.8 to 4 weight percent of cobalt Co, 0.5 to 0.9 weight percent of silicon Si, 12 to 13.6 weight percent of ferrum Fe, 5.3 to 6.4 weight percent of aluminum A1, 0.15 to 0.3 weight percent of titanium Ti, 0.005 to 0.01 weight percent of boron B, 0.05 to 0.15 weight percent of niobium Nb, 7.2 to 9.6 weight percent of tantalum Ta, 0.15 to 0.28 weight percent of hafnium Hf, 1.8 to 2.4 weight percent of chromium Cr, and the balance of nickel Ni.

In a preferred embodiment, the mass percentages of the main elements are respectively as follows: 2 wt% of Cr, 4.8 wt% of W, 0.2 wt% of Mo, 2.8 wt% of Co, 0.5 wt% of Si, 12 wt% of Fe, 5.3 wt% of Al 1, 0.15 wt% of Ti, 0.005 wt% of B, 0.05 wt% of Nb, 7.2 wt% of Ta, 0.15 wt% of Hf, 1.8 wt% of Cr, and the balance Ni.

In a preferred embodiment, the mass percentages of the main elements are respectively as follows: 2.6 wt% of Cr, 4.9 wt% of W, 0.4 wt% of Mo, 3.4 wt% of Co, 0.7 wt% of Si, 12.8 wt% of Fe, 5.85 wt% of Al A1, 0.23 wt% of Ti, 0.007 wt% of B, 0.1 wt% of Nb, 8.4 wt% of Ta, 0.21 wt% of Hf, 2.1 wt% of Cr, and the balance of Ni.

In a preferred embodiment, the mass percentages of the main elements are respectively as follows: 3.2 wt% of Cr, 5 wt% of W, 0.6 wt% of Mo, 4 wt% of Co, 0.9 wt% of Si, 13.6 wt% of Fe, 6.4 wt% of Al 1, 0.3 wt% of Ti, 0.01 wt% of B, 0.15 wt% of Nb, 9.6 wt% of Ta, 0.28 wt% of Hf, 2.4 wt% of Cr, and the balance of Ni.

The invention also comprises a preparation method of the nickel-based superalloy, which comprises the following specific steps:

s1, smelting to prepare powder: preparing high-temperature alloy powder by using a vacuum consumable furnace and adopting a vacuum induction smelting mode to carry out a gas smelting atomization method;

s2, forging and casting: increasing the temperature in the air induction furnace, smelting the alloy powder prepared in the step S1 by adopting forging and rolling processes, ensuring the control quantity of gas and impurity content during smelting the alloy components, and preparing a part blank by using a vacuum remelting-precision casting method, wherein the purpose of casting deformation is to crush casting tissues and optimize a microstructure;

s3, heat treatment: carrying out solution treatment, intermediate treatment and aging treatment on the part blank prepared in the step S2 to obtain a required structural state and good comprehensive performance;

s4, surface treatment: residual compressive stress is introduced into the metal surface layer through the shock wave induced by the strong laser to carry out surface modification, and the residual compressive stress is introduced into the metal surface layer through the shock wave induced by the strong laser to inhibit the initiation and the development of fatigue cracks, thereby improving the fatigue life gain coefficient.

In a preferred embodiment, the solution treatment temperature in the step S3 is set to 1150-1200 ℃, the treatment time is set to 1.5-2.5h, and then the solution is naturally cooled to room temperature.

In a preferred embodiment, the intermediate treatment temperature in step S3 is set to 1050-.

In a preferred embodiment, the aging treatment in step S3 includes a primary aging treatment and a secondary aging treatment, the primary aging treatment temperature is set at 820-.

The invention has the technical effects and advantages that:

the nickel-based alloy has the advantages that more alloy elements are dissolved in the nickel-based alloy, and the good structural stability can be kept; forming an A3B intermetallic compound gamma [ Ni3(Al, Ti) ] phase with coherent order as a strengthening phase, so that the alloy is effectively strengthened, and the high-temperature strength is higher than that of the iron-based high-temperature alloy and the cobalt-based high-temperature alloy; the nickel-based alloy containing chromium has better oxidation resistance and fuel gas corrosion resistance than the iron-based high-temperature alloy, so that the overall characteristics of the prepared nickel-based high-temperature alloy are improved, the working temperature of the nickel-based alloy is improved, and the use requirement of the existing industry on the nickel-based alloy can be better met.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.