阅读说明：本技术 一种高W、Mo含量镍基高温合金及其制备方法 (Nickel-based high-temperature alloy with high W, Mo content and preparation method thereof ) 是由 李成龙 浦益龙 赵长虹 王世普 孙文儒 荣文凯 王玉葵 贾鸿远 钟裕国 夏翅鹏 于 2020-05-28 设计创作，主要内容包括：本发明提供一种高W、Mo含量镍基高温合金,按质量百分比计,合金中元素的组分含量为：C 0.013～0.018wt%、Cr 20～21wt%、W 7.9～8.1wt%、Mo 7.9～8.1wt%、Al 0.6～0.75wt%、Ti 0.6～0.75wt%、Mn 0.28～0.33wt%、Si 0.15～0.20wt%、P 0.002～0.013wt%、S 0.001～0.013wt%、Fe 0.11～0.19wt%、B 0.002～0.005wt%、Ce 0.02～0.05wt%、Zr 0.02～0.06wt%、余量为Ni。本发明通过优化元素成分配比,降低了碳化物的析出倾向,碳化物分布更加均匀,减少聚集倾向。(The invention provides a high W, Mo content nickel-based high-temperature alloy, which comprises the following elements in percentage by mass: 0.013-0.018 wt% of C, 20-21 wt% of Cr, 7.9-8.1 wt% of W, 7.9-8.1 wt% of Mo, 0.6-0.75 wt% of Al, 0.6-0.75 wt% of Ti, 0.28-0.33 wt% of Mn, 0.15-0.20 wt% of Si, 0.002-0.013 wt% of P, 0.001-0.013 wt% of S, 0.11-0.19 wt% of Fe, 0.002-0.005 wt% of B, 0.02-0.05 wt% of Ce, 0.02-0.06 wt% of Zr and the balance of Ni. According to the invention, by optimizing the element component proportion, the precipitation tendency of the carbide is reduced, the carbide is more uniformly distributed, and the aggregation tendency is reduced.)

1. A high W, Mo content nickel-base superalloy, comprising: the alloy comprises the following elements in percentage by mass: 0.013-0.018 wt% of C, 20-21 wt% of Cr, 7.9-8.1 wt% of W, 7.9-8.1 wt% of Mo, 0.6-0.75 wt% of Al, 0.6-0.75 wt% of Ti, 0.28-0.33 wt% of Mn, 0.15-0.20 wt% of Si, 0.002-0.013 wt% of P, 0.001-0.013 wt% of S, 0.11-0.19 wt% of Fe, 0.002-0.005 wt% of B, 0.02-0.05 wt% of Ce, 0.02-0.06 wt% of Zr and the balance of Ni.

2. A preparation method of a high W, Mo content nickel-based superalloy is characterized by comprising the following steps: the method comprises the following steps:

1) the nickel-based high-temperature alloy comprises the following components in percentage by mass: 0.013-0.018 wt% of C, 20-21 wt% of Cr, 7.9-8.1 wt% of W, 7.9-8.1 wt% of Mo, 0.6-0.75 wt% of Al, 0.6-0.75 wt% of Ti, 0.28-0.33 wt% of Mn, 0.28-0.33 wt% of Si, 0.002-0.013 wt% of P, 0.001-0.013 wt% of S, 0.11-0.19 wt% of Fe, 0.002-0.005 wt% of B, 0.02-0.05 wt% of Ce, 0.02-0.06 wt% of Zr and the balance of Ni; adding C, Cr, W, Mo, Si, P, S, Fe and Ni into a crucible, putting the crucible into a vacuum induction furnace for vacuum melting, adding Al and Ti into the crucible for refining, then adding B, Ce, Zr and Mn, filling argon, and casting to obtain an ingot;

2) adding the cast ingot into a slag pool, and adding slag for electroslag remelting to obtain an electroslag ingot;

3) and adding the electroslag ingot into a heating furnace to perform heat treatment along with the furnace, forging and cooling to obtain a forged piece.

3. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: the working vacuum degree in the vacuum smelting in the step 1) is less than or equal to 15 Pa; the melting temperature of the raw materials is 1480-1500 ℃.

4. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: the refining vacuum degree in the step 1) is less than or equal to 5Pa, the refining temperature is 1500-1520 ℃, and the refining time is 60-120 min.

5. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: the pressure of argon filling in the step 1) is 3000-5000 Pa; the temperature when argon is filled is 1480-1500 ℃.

6. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: the slag in the step 2) comprises 58.5-60.5% of CaF₂、19.5%～21.5%Al₂O₃10 to 11 percent of CaO and 9 to 10 percent of MgO; the adding amount of the slag is 4-8% of the weight of the ingot.

7. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: the heat treatment temperature in the step 3) is 1160-1200 ℃, and the time is 40-80 h.

8. The method of making a high W, Mo content nickel-base superalloy as in claim 2, wherein: and 3) forging and upsetting for multiple times.

9. The method of making a high W, Mo content nickel-base superalloy as in claim 8, wherein: the upsetting reduction is more than or equal to 30% each time, the drawing operation is carried out immediately after each upsetting, the reduction is controlled to be 30-50 mm, and the deformation is controlled to be more than or equal to 50% each time.

Technical Field

The invention relates to the field of nickel-based superalloy manufacturing, in particular to a high W, Mo content nickel-based superalloy and a preparation method thereof.

Background

The GH3128 alloy is a nickel-based alloy which is solid-solution-strengthened with W, Mo element and grain boundaries are strengthened with B, Ce, and Zr, and the composition is shown in table 1. The alloy has high plasticity, high creep strength, good oxidation resistance, good stamping and welding performance and the like. The flame tube is suitable for a combustion chamber flame tube, an afterburner shell, an adjusting sheet and other high-temperature parts of an aircraft engine working for a long time at 950 ℃. The alloy is a single-phase austenite structure in a solid solution state, contains a small amount of fine and uniformly distributed TiN and a large amount of M6C, and precipitates M6C, mu, M23C6 and the like in the long-term failure process.

TABLE 1 elemental composition wt%

The current domestic mainstream production mode is as follows: the alloy is formed by non-vacuum induction, electroslag-tolerant remelting and free forging, because the content of W, Mo element is high (average 8%) and the average content of Cr element is 20.5%, a great deal of carbide is precipitated by taking M6C as a representative in the solidification process of the alloy, and abnormal aggregation is easily generated in the precipitation process of the carbide to cause uneven structure, and the high-power structure is shown in figure 1; the carbides which are abnormally aggregated inside bring product quality risks to downstream users, the users have certain probability of cracks in the hot working process, and the positions where the cracks appear are all accompanied with the abnormal aggregation of the carbides after later verification, so that the key link of improving the quality level of the GH3128 alloy bar by the carbide aggregation of the internal structure is improved.

Disclosure of Invention

The invention aims to overcome and supplement the defects in the prior art, and provides a high W, Mo content nickel-based superalloy and a preparation method thereof, wherein the aggregation degree of internal carbides is reduced and the uniformity of the material is improved on the premise of ensuring that the conventional mechanical property of the material is not influenced by changing a process manufacturing method, so that the nickel-based superalloy with better comprehensive performance is obtained.

The technical scheme adopted by the invention is as follows:

a high W, Mo content nickel-base superalloy, wherein: the alloy comprises the following elements in percentage by mass: 0.013-0.018 wt% of C, 20-21 wt% of Cr, 7.9-8.1 wt% of W, 7.9-8.1 wt% of Mo, 0.6-0.75 wt% of Al, 0.6-0.75 wt% of Ti, 0.28-0.33 wt% of Mn, 0.15-0.20 wt% of Si, 0.002-0.013 wt% of P, 0.001-0.013 wt% of S, 0.11-0.19 wt% of Fe, 0.002-0.005 wt% of B, 0.02-0.05 wt% of Ce, 0.02-0.06 wt% of Zr and the balance of Ni.

A method for preparing a high W, Mo content nickel-base superalloy, wherein: the method comprises the following steps:

1) the nickel-based high-temperature alloy comprises the following components in percentage by mass: 0.013-0.018 wt% of C, 20-21 wt% of Cr, 7.9-8.1 wt% of W, 7.9-8.1 wt% of Mo, 0.6-0.75 wt% of Al, 0.6-0.75 wt% of Ti, 0.28-0.33 wt% of Mn, 0.28-0.33 wt% of Si, 0.002-0.013 wt% of P, 0.001-0.013 wt% of S, 0.11-0.19 wt% of Fe0.11-0.19 wt% of B, 0.002-0.005 wt% of Ce, 0.02-0.05 wt% of Zr, 0.02-0.06 wt% of Ni and the balance of Ni; adding C, Cr, W, Mo, Si, P, S, Fe and Ni into a crucible, putting the crucible into a vacuum induction furnace for vacuum melting, adding Al and Ti into the crucible for refining, then adding B, Ce, Zr and Mn, filling argon, and casting to obtain an ingot;

2) adding the cast ingot into a slag pool, and adding slag for electroslag remelting to obtain an electroslag ingot;

3) and adding the electroslag ingot into a heating furnace to perform heat treatment along with the furnace, forging and cooling to obtain a forged piece.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the working vacuum degree in the vacuum smelting in the step 1) is less than or equal to 15 Pa; the melting temperature of the raw materials is 1480-1500 ℃.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the refining vacuum degree in the step 1) is less than or equal to 5Pa, the refining temperature is 1500-1520 ℃, and the refining time is 60-120 min.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the pressure of argon filling in the step 1) is 3000-5000 Pa; the temperature when argon is filled is 1480-1500 ℃.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the slag in the step 2) comprises 58.5-60.5% of CaF₂、19.5％～21.5％Al₂O₃10 to 11 percent of CaO and 9 to 10 percent of MgO; the adding amount of the slag is 4-8% of the weight of the ingot.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the heat treatment temperature in the step 3) is 1160-1200 ℃, and the time is 40-80 h.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: and 3) forging and upsetting for multiple times.

Preferably, the preparation method of the high W, Mo content nickel-based superalloy is that: the upsetting reduction is more than or equal to 30% each time, the drawing operation is carried out immediately after each upsetting, the reduction is controlled to be 30-50 mm, and the deformation is controlled to be more than or equal to 50% each time.

The invention has the advantages that: the nickel-based high-temperature alloy with high W, Mo content and the preparation method thereof select high-quality raw materials to avoid the introduction of harmful elements; by optimizing the element component proportion, the precipitation tendency of carbide is reduced; the smelting equipment is a vacuum induction furnace, so that the gas N element of the material can be effectively controlled, and the content of the gas N element in the material is reduced from 300ppm on average to less than or equal to 50 ppm; the electrode selected for electroslag remelting adopts a smelting mode that a filling end is melted first, so that the fluctuation range of smelting parameters of the electroslag remelting is reduced; the carbide after the bar is forged is more uniformly distributed, and the aggregation tendency is reduced.

Drawings

FIG. 1 is an internal high magnification organization chart of a GH3128 conventional wrought nickel-base superalloy.

FIG. 2 is a graph of the distribution of internal crack-neighborhood carbides of a conventional wrought nickel-base superalloy of GH3128 after further hot working.

FIG. 3 is a high power internal structure diagram of a nickel-based superalloy prepared in example 1 of the present invention.

FIG. 4 is a high power internal structure diagram of a nickel-base superalloy prepared in example 2 of the present invention.

FIG. 5 is a high power internal structure diagram of a nickel-base superalloy prepared in example 3 of the present invention.

Detailed Description

The invention is further illustrated by the following specific figures and examples.