阅读说明：本技术 一种抗氧化镍基合金 (Oxidation-resistant nickel-based alloy ) 是由 谭政 佟健 郑志 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种镍基合金,属于抗氧化镍基合金领域。该合金的成分组成与百分含量(wt.％)为：C 0.2～0.5％,Cr 26～28％,Nb 0.5～1.5％,W 3～5％,Ti 2～4％,Al 1～3％,B 0.005～0.012％,Si 0.1～0.5％,Zr 0.01～0.1％,Fe 0～5％,RE 0.01～0.1％,其余为Ni。通过适当的元素选择及成分设计,使该合金既具有较高的高温力学性能,又兼备优异的抗高温氧化性能,且生产成本低廉,适用于制造在高温高应力下工作的玻璃棉用离心器。(The invention discloses a nickel-based alloy, and belongs to the field of oxidation-resistant nickel-based alloys. The alloy comprises the following components in percentage by weight: 0.2-0.5% of C, 26-28% of Cr, 0.5-1.5% of Nb, 3-5% of W, 2-4% of Ti, 1-3% of Al, 0.005-0.012% of B, 0.1-0.5% of Si, 0.01-0.1% of Zr, 0-5% of Fe, 0.01-0.1% of RE and the balance of Ni. Through proper element selection and component design, the alloy has high-temperature mechanical property, excellent high-temperature oxidation resistance and low production cost, and is suitable for manufacturing a glass wool centrifuge working under high temperature and high stress.)

1. An oxidation-resistant nickel-based alloy, characterized in that: the alloy comprises, by mass, 0.2-0.5% of C, 26-28% of Cr, 0.5-1.5% of Nb, 3-5% of W, 2-4% of Ti, 1-3% of Al, 0.005-0.012% of B, 0.1-0.5% of Si, 0.01-0.1% of Zr, 0-5% of Fe, 0.01-0.1% of rare earth and the balance of Ni.

2. The oxidation resistant nickel-base alloy of claim 1, wherein: in the oxidation-resistant nickel-based alloy, W + Cr-5C is less than or equal to 31%, wherein W, Cr and C respectively represent the mass fractions of elements W, Cr and C in the oxidation-resistant nickel-based alloy.

3. The oxidation resistant nickel-base alloy of claim 1, wherein: in the oxidation-resistant nickel-based alloy, Ti/Al is more than or equal to 0.8 and less than or equal to 3.5, wherein Ti and Al respectively represent the mass fraction of elements Ti and Al in the oxidation-resistant nickel-based alloy.

Technical Field

The invention relates to a nickel-based alloy, in particular to an oxidation-resistant nickel-based alloy with good high-temperature mechanical property and excellent high-temperature oxidation resistance.

Background

The centrifugal device is a key part for producing glass wool and products thereof by a centrifugal blowing method. The molten glass liquid flows into a high-speed rotating centrifuge through a channel and a bushing plate, under the action of centrifugal force, the glass liquid forms a thin stream through tens of thousands of small holes in the side wall of the centrifuge, and then is further pulled to generate glass wool with the diameter of about 4-8 mu m under the action of high-temperature high-speed gas flow.

Because the working environment is severe and the alloy used for manufacturing the centrifuge is required to have good high-temperature mechanical property, high-temperature oxidation resistance and molten glass corrosion and scouring resistance, the centrifuge is mostly prepared by adopting Ni-based or Co-based oxidation resistant alloy. However, cobalt is expensive and a rare element, and in view of cost, most of the glass wool centrifuges used at present are made of nickel-based oxidation resistant alloy.

With the continuous improvement of the production efficiency and quality requirements of glass wool, the design size, the rotation speed and the working temperature of the centrifuge are also continuously increased. The size of the existing centrifuge is larger (more than phi 400 mm) and the working temperature is higher (1050 ℃ -1080 ℃), which provides new challenges for the mechanical property and oxidation resistance of centrifuge materials at higher temperature. The existing centrifuge alloys such as Inconel 625, ZG40Cr28Ni48W5 and the like have insufficient high-temperature mechanical properties or poor high-temperature oxidation resistance, and are difficult to meet the use requirements under new working conditions. Therefore, an antioxidant nickel-based alloy with high-temperature mechanical property, excellent high-temperature oxidation resistance and low cost is urgently needed to be developed and used for preparing a glass wool centrifuge.

Disclosure of Invention

In view of the above disadvantages of the prior art, the present invention provides an oxidation resistant nickel-based alloy.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the oxidation-resistant nickel-based alloy comprises, by weight, 0.2-0.5% of C, 26-28% of Cr, 0.5-1.5% of Nb, 3-5% of W, 2-4% of Ti, 1-3% of Al, 0.005-0.012% of B, 0.1-0.5% of Si, 0.01-0.1% of Zr, 0-5% of Fe, 0.01-0.1% of rare earth and the balance of Ni.

As a preferred technical scheme: in the oxidation-resistant nickel-based alloy, W + Cr-5C is less than or equal to 31%, Ti/Al is less than or equal to 3.5 and more than or equal to 0.8, wherein W, Cr, C, Ti and Al respectively represent the mass fraction of elements W, Cr, C, Ti and Al in the oxidation-resistant nickel-based alloy.

The chemical composition of the alloy of the invention is designed mainly based on the following reasons:

the alloy of the invention takes Ni as a matrix, and simultaneously can be added with a small amount of Fe to reduce the cost under the condition of ensuring that the high-temperature performance of the alloy is not damaged.

C (carbon) is an important element influencing the high-temperature mechanical property and the wear resistance of the alloy. C forms different types of carbide in the alloy, so that dislocation movement is hindered, and the strength of the alloy is improved. In addition, the carbide has higher hardness, which is beneficial to improving the capability of the alloy for resisting the abrasion of molten glass and high-temperature airflow. However, the carbide is easily oxidized preferentially to form loose pores during high-temperature oxidation, which damages the compactness of the alloy oxide film and affects the high-temperature oxidation resistance of the alloy. Therefore, the content of C in the alloy is controlled to be 0.2-0.5 wt.%.

Cr (Cr) is an important element for influencing the oxidation resistance and molten glass corrosion resistance of the alloy, and can be combined with C to generate a skeleton carbide for strengthening. Cr can also be dissolved in the matrix to play a solid solution strengthening role. Further, W (tungsten) is also an important solid-solution strengthening element. However, too high a content of solid solution elements may decrease the structural stability of the alloy, resulting in precipitation of harmful phases. Comprehensively considering the antioxidation and solid solution strengthening effects of elements, the content of Cr in the alloy is controlled to be 26-28 wt.%, the content of W is controlled to be 3-5 wt.%, and W + Cr-5C is less than or equal to 31%, wherein W, Cr and C respectively represent the mass fractions of the elements W, Cr and C in the antioxidation nickel-based alloy.

Nb (niobium) is an important element affecting the high-temperature mechanical properties of the alloy, and can be combined with C to form MC type carbide NbC. On one hand, the carbide of Nb replaces a part of carbide of Cr, which is beneficial to improving the Cr content in the matrix and enhancing the high-temperature oxidation resistance of the alloy; on the other hand, NbC is distributed in the alloy in a fine and dispersed manner, which is beneficial to improving the high-temperature mechanical property of the alloy. However, excessive Nb causes harmful phase precipitation at the grain boundary of the alloy, so that the content of Nb in the alloy is controlled to be 0.5-1.5 wt.%.

Al (aluminum) is a precipitation strengthening phase gamma' (Ni) in the alloy₃Al), and a proper amount of Al contributes to the improvement of the high-temperature strength of the alloy. However, Al generates Al upon high-temperature oxidation₂O₃And the alloy can react with alkaline molten glass to destroy the integrity of an oxide film, so that the corrosion resistance of the alloy to the molten glass is not facilitated. Ti (titanium) atoms may replace Al atoms in the gamma' phase to form Ni₃(Al, Ti) also has a precipitation strengthening effect. In addition, Ti may promote MC type carbideAnd the high-temperature strength of the alloy is improved. However, too high a Ti/Al ratio may decrease the stability of the γ' phase. In addition, Ti belongs to active metal elements, is easy to generate internal oxidation or internal nitridation when the alloy is oxidized at high temperature, and is not beneficial to the high-temperature oxidation resistance of the alloy. By combining the factors, the content of Al is controlled to be 1-3 wt.%, the content of Ti is controlled to be 2-4 wt.%, and Ti/Al is more than or equal to 0.8 and less than or equal to 3.5, wherein Ti and Al respectively represent the mass fractions of elements Ti and Al in the antioxidant nickel-based alloy.

After B (boron) and Zr (zirconium) are added into the alloy, the B (boron) and the Zr (zirconium) are partially polymerized at a crystal boundary, so that the mechanical property of the alloy is improved to a certain extent, and the effect is more obvious when the B (boron) and the Zr (zirconium) are added in a composite way. However, too high B, Zr content lowers the initial melting temperature of the alloy, which is detrimental to the high temperature performance of the alloy. B, Zr elements are simultaneously added into the alloy, and the addition amounts are respectively controlled to be 0.005-0.012 wt.% of B and 0.01-0.1 wt.% of ZrC.

Si (silicon) can improve the appearance of carbide in the alloy and is beneficial to improving the high-temperature wear resistance of the alloy. However, the high-temperature mechanical property of the alloy is damaged due to the excessively high Si content, so that the Si content in the alloy is controlled to be 0.1-0.5 wt%.

RE (rare earth) is added into the alloy, and trace rare earth elements are added into the alloy to form an oxide pinning matrix in the high-temperature oxidation process, so that the adhesion of an oxide film can be improved, and the high-temperature airflow and molten glass liquid erosion resistance of the alloy can be enhanced. Therefore, 0.01-0.1 wt.% of RE is added into the alloy, so that the service performance of the alloy is improved.

The reasonable proportion of the elements is the basis for obtaining excellent comprehensive performance of the alloy. According to different effects of each element on the high-temperature mechanical property and the oxidation resistance of the alloy, the invention determines the appropriate content range of each element through a large number of experimental researches, so that the alloy has both higher high-temperature mechanical property and excellent high-temperature oxidation resistance.

The invention has the advantages that: compared with the alloy for the existing glass cotton centrifuge, the alloy provided by the invention has higher high-temperature mechanical property and excellent high-temperature oxidation resistance, and the large-size glass cotton centrifuge prepared from the alloy provided by the invention is not easy to deform when used at a high temperature of 1050-1080 ℃, so that the service life is obviously prolonged, the alloy cost is low, and the alloy has very good economic benefits.

Drawings

FIG. 1 is a graph comparing the 1080 ℃ oxidation damage depth of the example alloy, and the comparative alloy.

FIG. 2 is a comparison of 1080 ℃ oxidation damage depth for example three, four alloys and a comparison file alloy.

FIG. 3 is a comparison of 1080 ℃ oxidation damage depth for example five and six alloys versus a comparative file alloy.

FIG. 4 shows the oxide layer of an alloy of the embodiment after oxidizing at 1080 ℃ for 150 h.

FIG. 5 shows the oxide layer of the second alloy of the embodiment after oxidizing at 1080 ℃ for 150 h.

FIG. 6 shows the oxide layer of the three alloys of the example after oxidizing at 1080 ℃ for 150 h.

FIG. 7 shows the oxide layer of the four-alloy of the embodiment after oxidizing at 1080 ℃ for 150 h.

FIG. 8 shows the oxide layer of the example V-alloy after oxidizing at 1080 ℃ for 150 h.

FIG. 9 shows the oxide layer of the six-alloy of the embodiment after oxidizing for 150h at 1080 ℃.

FIG. 10 shows the oxide layer of a comparative example-alloy after 150h of oxidation at 1080 ℃.

FIG. 11 shows the oxide layer of the second alloy of the comparative document after oxidizing for 150h at 1080 ℃.

Detailed Description

The invention is described in detail below with reference to the drawings.

The oxidation-resistant nickel-based alloy comprises, by weight, 0.2-0.5% of C, 26-28% of Cr, 0.5-1.5% of Nb, 3-5% of W, 2-4% of Ti, 1-3% of Al, 0.005-0.012% of B, 0.1-0.5% of Si, 0.01-0.1% of Zr, 0-5% of Fe, 0.01-0.1% of rare earth and the balance of Ni.