阅读说明：本技术 一种gh2018合金电渣锭及其制备方法 (GH2018 alloy electroslag ingot and preparation method thereof ) 是由 李成龙 浦益龙 王世普 赵长虹 荣文凯 王玉葵 李晴 王�琦 钟裕国 贾鸿远 夏 于 2020-07-13 设计创作，主要内容包括：本发明提供一种GH2018合金电渣锭,合金中元素的组分含量为：C 0.040～0.050wt%、Cr 18.5～20.5wt%、Ni 40.5～43.5wt%、Al 0.6～0.7wt%、Ti 2.0～2.2wt%、W 1.85～2.15wt%、Mo 3.8～4.2wt%、Mn 0.01～0.03wt%、Ce 0.002～0.02wt%、Si 0.2～0.6wt%、P 0.001～0.02wt%、S 0.001～0.01wt%、B 0.001～0.01wt%、Zr 0.005～0.05wt%、Cu 0.02～0.2wt%、余量为Fe。本发明的合金电渣锭电渣重熔过程补加铝粉和充惰性氩气,提高了电渣锭成分均匀性。(The invention provides a GH2018 alloy electroslag ingot, which comprises the following elements in alloy: 0.040-0.050 wt% of C, 18.5-20.5 wt% of Cr, 40.5-43.5 wt% of Ni, 0.6-0.7 wt% of Al, 2.0-2.2 wt% of Ti, 1.85-2.15 wt% of W, 3.8-4.2 wt% of Mo, 0.01-0.03 wt% of Mn, 0.002-0.02 wt% of Ce, 0.2-0.6 wt% of Si, 0.001-0.02 wt% of P, 0.001-0.01 wt% of S, 0.001-0.01 wt% of B, 0.005-0.05 wt% of Zr, 0.02-0.2 wt% of Cu, and the balance Fe. The alloy electroslag ingot of the invention is added with aluminum powder and inert argon gas in the electroslag remelting process, thus improving the component uniformity of the electroslag ingot.)

1. A GH2018 alloy electroslag ingot is characterized in that: the alloy comprises the following elements in percentage by mass: 0.040-0.050 wt% of C, 18.5-20.5 wt% of Cr, 40.5-43.5 wt% of Ni, 0.6-0.7 wt% of Al, 2.0-2.2 wt% of Ti, 1.85-2.15 wt% of W, 3.8-4.2 wt% of Mo, 0.01-0.03 wt% of Mn, 0.002-0.02 wt% of Ce, 0.2-0.6 wt% of Si, 0.001-0.02 wt% of P, 0.001-0.01 wt% of S, 0.001-0.01 wt% of B, 0.005-0.05 wt% of Zr, 0.02-0.2 wt% of Cu, and the balance Fe.

2. A preparation method of GH2018 alloy electroslag ingot 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: 0.040-0.050 wt% of C, 18.5-20.5 wt% of Cr, 40.5-43.5 wt% of Ni, 0.6-0.7 wt% of Al, 2.0-2.2 wt% of Ti, 1.85-2.15 wt% of W, 3.8-4.2 wt% of Mo, 0.01-0.03 wt% of Mn, 0.002-0.02 wt% of Ce, 0.2-0.6 wt% of Si, 0.001-0.02 wt% of P, 0.001-0.01 wt% of S, 0.001-0.01 wt% of B, 0.005-0.05 wt% of Zr, 0.02-0.2 wt% of Cu, and the balance of Fe; adding C, Cr, Ni, W, Mo, Mn, Ce, Si, P, S, B, Zr and Cu into a crucible, putting the crucible into a vacuum induction furnace for vacuum smelting, respectively adding Al and Ti into the crucible for refining, filling argon, then adding B, Ce and Zr, and casting to obtain an ingot;

2) and performing tumbling grinding treatment on the cast ingot, then adding the cast ingot into a slag pool, and adding molten slag to perform electroslag remelting to obtain an electroslag ingot.

3. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: 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 1520-1540 ℃.

4. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: and in the step 1), during vacuum melting, 1/3-1/2C is added into a crucible for vacuum melting until the C is completely melted, and then the rest C is added.

5. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: the total melting time in the step 1) is 20-40 min, the rest C is added for 15-30 min, and then Al and Ti are added for refining.

6. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: the refining vacuum degree in the step 1) is less than or equal to 5Pa, and the refining time is more than or equal to 60 min.

7. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: the pressure of argon filling in the step 1) is 3000-4000 Pa; the casting temperature is 1440-1460 ℃.

8. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: the slag in the step 2) comprises 69-71% of CaF₂、14.5%～15.5%Al₂O₃14.5 to 15.5 percent of CaO; the adding amount of the slag is 5.4 to 5.8 percent of the weight of the ingot; adding Al again in the electroslag remelting process₂O₃，Al₂O₃The mass of the slag accounts for 0.8 to 2.5 percent of the slag.

9. The method for preparing the GH2018 alloy electroslag ingot according to claim 8, wherein the method comprises the following steps: 10-18% of Al is added in the electroslag remelting and slagging stage in the step 2), and 40-45% of Al is added in the middle-stage smelting and the later-stage smelting respectively; argon is filled in the electroslag remelting process, and the flow rate of the argon is 8.0-9.0L/min.

10. The method for preparing GH2018 alloy electroslag ingot according to claim 2, wherein the method comprises the following steps: the surface polishing amount of the barreling treatment in the step 2) is 3-5 mm.

Technical Field

The invention relates to the field of alloy manufacturing, in particular to a GH2018 alloy electroslag ingot and a preparation method thereof.

Background

The GH2018 alloy is a Fe-Ni-Cr-based alloy which is subjected to solid solution strengthening by Cr, W and Mo elements and aging strengthening by Al and Ti elements, and the components are shown in Table 1. The alloy has high plasticity, high temperature strength level, good oxidation resistance, stamping welding performance and the like. The flame tube is suitable for high-temperature parts such as a flame tube of a combustion chamber of an aircraft engine working for a long time at 800 ℃. The alloy has a single-phase austenite structure in a solid solution state, and contains MC type carbide and a trace amount of M₃B₂A type boride.

TABLE 1 elemental composition wt%

The alloy contains certain Al and Ti elements with larger content difference, the material can be released with air in the electroslag remelting process, and the Al and Ti elements are active and easy to react with oxygen in the atmosphere; meanwhile, with the whole process of electroslag remelting, the conditions of reaction between a metal melting pool and oxygen at each stage of the electroslag remelting are different, so that the phenomenon that the components of the alloy ingot are uneven after the alloy ingot is subjected to electroslag remelting is caused.

Disclosure of Invention

The invention aims to overcome and supplement the defects in the prior art, and provides a GH2018 alloy electroslag ingot and a preparation method thereof, wherein the surface quality of the electroslag ingot is improved by changing a process method on the premise of ensuring that the conventional mechanical property of the electroslag ingot is not influenced, so that the electroslag ingot with uniform components, good surface and easiness in hot processing is obtained. The technical scheme adopted by the invention is as follows:

a GH2018 alloy electroslag ingot, wherein: the alloy comprises the following elements in percentage by mass: 0.040-0.050 wt% of C, 18.5-20.5 wt% of Cr, 40.5-43.5 wt% of Ni, 0.6-0.7 wt% of Al, 0.0-2.2 wt% of Ti2, 1.85-2.15 wt% of W, 3.8-4.2 wt% of Mo, 0.01-0.03 wt% of Mn, 0.002-0.02 wt% of Ce, 0.2-0.6 wt% of Si, 0.001-0.02 wt% of P, 0.001-0.01 wt% of S, 0.001-0.01 wt% of B, 0.005-0.05 wt% of Zr, 0.02-0.2 wt% of Cu, and the balance Fe.

A preparation method of GH2018 alloy electroslag ingot is disclosed, wherein: the method comprises the following steps:

1) the nickel-based high-temperature alloy comprises the following components in percentage by mass: 0.040-0.050 wt% of C, 18.5-20.5 wt% of Cr, 40.5-43.5 wt% of Ni, 0.6-0.7 wt% of Al, 2.0-2.2 wt% of Ti, 1.85-2.15 wt% of W, 3.8-4.2 wt% of Mo, 0.01-0.03 wt% of Mn, 0.002-0.02 wt% of Ce, 0.2-0.6 wt% of Si, 0.001-0.02 wt% of P, 0.001-0.01 wt% of S, 0.001-0.01 wt% of B, 0.005-0.05 wt% of Zr, 0.02-0.2 wt% of Cu, and the balance of Fe; adding C, Cr, Ni, W, Mo, Mn, Ce, Si, P, S, B, Zr and Cu into a crucible, putting the crucible into a vacuum induction furnace for vacuum smelting, respectively adding Al and Ti into the crucible for refining, filling argon, then adding B, Ce and Zr, and casting to obtain a cast ingot;

2) and performing tumbling grinding treatment on the cast ingot, then adding the cast ingot into a slag pool, and adding molten slag to perform electroslag remelting to obtain an electroslag ingot. Inert argon is filled in the electroslag remelting process to isolate air as much as possible, so that the reaction of Al and Ti elements and oxygen in the atmosphere is reduced.

The vacuum induction melting casting electrode is subjected to barreling treatment, so that the surface of the electrode is free from defects of heavy skin, flying burrs and the like, and the pollution of an electroslag remelting process to a metal molten pool is avoided.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: 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 1520-1540 ℃.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: and in the step 1), adding 1/3-1/2C into a crucible during vacuum melting, performing vacuum melting until the C is completely melted, and then adding the rest C.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: the total melting time in the step 1) is 20-40 min, the rest C15-30 min is added, and then Al and Ti are added for refining.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: the refining vacuum degree in the step 1) is less than or equal to 5Pa, and the refining time is more than or equal to 60 min.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: the pressure of argon filling in the step 1) is 3000-4000 Pa; the casting temperature is 1440-1460 ℃.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: the slag in the step 2) comprises 69-71% of CaF₂、14.5％～15.5％Al₂O₃14.5 to 15.5 percent of CaO; the adding amount of the slag is 5.4 to 5.8 percent of the weight of the ingot; adding Al again in the electroslag remelting₂O₃，Al₂O₃The mass of the slag accounts for 0.8 to 2.5 percent of that of the slag; argon is filled in the electroslag remelting process, and the flow of the argon is 8.0-9.0L/min.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: 10-18% of Al is added in the remelting and slagging stage of the electroslag in the step 2), and 40-45% of Al is added in the middle-stage smelting and the later-stage smelting respectively. Aluminum powder is added to inhibit Al and Ti in the electrode from reacting with oxygen in the atmosphere, so that element burning loss is reduced, and component uniformity is improved.

Preferably, the preparation method of the GH2018 alloy electroslag ingot is as follows: the surface polishing amount of the roll polishing treatment in the step 2) is 3-5 mm.

The invention has the advantages that: the GH2018 alloy electroslag ingot disclosed by the invention is made of high-quality raw materials, so that harmful elements are prevented from being brought in; optimizing the element component proportion, and accurately controlling the chemical components after vacuum induction melting; the content of the O, N element in the material is reduced (O is less than or equal to 15ppm, N is less than or equal to 30 ppm); the fluctuation range of smelting parameters of electroslag remelting is narrowed, and the surface quality of an electroslag ingot is ensured; the method of replenishing aluminum powder and charging inert Ar gas in the electroslag remelting process reduces the burning loss of Al and Ti elements and improves the component uniformity of the electroslag ingot.

Detailed Description

The present invention will be further described with reference to the following specific examples.