Nickel-based superalloy non-vacuum furnace smelting device

Abstract

The utility model discloses a nickel-based superalloy non-vacuum furnace smelting device, which comprises an intermediate frequency furnace, a smelting furnace, a high-temperature furnace, a high-temperature furnace, a high-temperature furnace, a high-temperature furnace, a high-temperature furnace, a high-temperature furnace, a high-temperature furnace and a high-temperature furnace, a ceramic support is annularly arranged on the bottom side of the air injection assembly, the air injection assembly is placed at a furnace opening of the intermediate frequency furnace through the ceramic support, and a plurality of air nozzles are evenly distributed on the air injection assembly in the circumferential direction. The gas nozzles are arranged towards the interior of the intermediate frequency furnace, and inert gas sprayed out of the gas nozzles forms a protective gas layer above the smelting molten steel; the gas supply source is arranged on the outer side of the intermediate frequency furnace, is communicated with the gas nozzle pipeline and provides inert injection gas for the gas nozzle; during use, furnace charge is prepared firstly, then the furnace charge is put into an intermediate frequency furnace to be smelted, during smelting, a protective gas layer used for isolating air needs to be formed above molten steel through an air injection assembly, inclusion in the molten steel is avoided, then the molten steel is used for casting and molding products, and production of nickel-based superalloy castings under the non-vacuum condition is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to investment casting technical field, concretely relates to a nickel base high temperature alloy non-vacuum furnace smelting device. BACKGROUND

[0002] Nickel base high temperature alloy is with nickel as matrix, contains nickel generally greater than 50%, has chromium, molybdenum, tungsten and other strengthening elements, has higher strength and certain oxidation corrosion resistance and other comprehensive performance at high temperature, is mainly applied to space engine, gas turbine, ship, energy, petroleum chemical equipment and other key high temperature components, and investment casting is one of its main production modes.

[0003] Nickel base high temperature alloy material is easy to absorb gas, usually smelts parent alloy with vacuum medium frequency induction furnace to ensure composition and control gas and impurity content, and uses vacuum remelting, adopts investment casting mode to manufacture corresponding material industrial parts.But at present, most domestic precision foundry enterprises do not have such equipment conditions, to meet customer requirements, undertake part nickel base high temperature alloy material casting order, need to study the technical scheme of smelting nickel base high temperature alloy material with non-vacuum medium frequency furnace.

[0004] Therefore, how to provide a kind of nickel base high temperature alloy non-vacuum furnace smelting device is the problem of the person skilled in the art urgently needed to solve. INVENTION CONTENTS

[0005] Therefore, the utility model provides a kind of nickel base high temperature alloy non-vacuum furnace smelting device, and production condition is relatively easy to realize, and it is relatively easy to promote use.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a kind of nickel base high temperature alloy non-vacuum furnace smelting device, it includes:

[0007] Medium frequency furnace, the top of the medium frequency furnace is open, the inside of the medium frequency furnace is used to hold the metal raw material to be smelted;

[0008] Jet assembly, the bottom side of the jet assembly is annularly provided with a ceramic support, the jet assembly is placed at the furnace mouth of the medium frequency furnace by the ceramic support, a plurality of jet nozzles are uniformly distributed on the jet assembly;The jet nozzle is arranged towards the direction inside the medium frequency furnace, and the inert gas sprayed by the jet nozzle forms a protective gas layer above the molten steel;

[0009] Gas supply source, the gas supply source is arranged on the outside of the medium frequency furnace, and the gas supply source is in communication with the jet nozzle pipeline and provides inert blowing gas for the jet nozzle.

[0010] The utility model discloses beneficial effect is: in the metal raw material smelting, utilize the air supply source and the jet component to the middle -frequency intracranial inert gas and form the protective gas layer above the molten steel, avoid high -temperature liquid metal from the air and inhale, cause the casting defects such as oxidation inclusion and pore, the protective gas layer of setting is used to isolate the reaction of air and metal solution, avoid alloy element oxidation and burn loss, still can reduce the inhale tendency of alloy liquid, thereby improve the smelting quality and casting quality of alloy, thereby solved the condition restriction of smelting under the non - vacuum environment.

[0011] Preferably, the jet component and the top of the ceramic support are arranged with an annular pipe, a plurality of jet nozzles are arranged on the inner side of the annular pipe and communicated with the annular pipe, and the jet nozzles are arranged downwardly inclined.

[0012] Therefore, the technical effects are: the external inert gas is sent into the middle -frequency furnace by the plurality of jet nozzles, and the protective gas layer is formed at the furnace mouth, which can effectively isolate the contact of the molten steel and the external air, and the uniform jet nozzles can uniformly spray the inert gas, thereby ensuring the effective formation of the protective gas layer.

[0013] Preferably, the jet nozzle is formed of heat-resistant steel material, and the gas outlet hole of the jet nozzle is 3mm-5mm.

[0014] Therefore, the technical effects are: considering the high-temperature environment in the middle -frequency furnace, the heat resistance of the jet nozzle needs to be good, so the heat-resistant steel material is selected for forming, and in specific implementation, the annular pipe is also formed of heat-resistant steel material.

[0015] Preferably, the air supply source is carried by a high-pressure tank, and a gas path is connected between the air supply source and the annular pipe.

[0016] Therefore, the technical effects are: in specific implementation, the stainless steel pipe is used to connect between the gas tank and the annular pipe, which has certain pressure-bearing capacity. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure diagram of the nickel-based high-temperature alloy non-vacuum furnace smelting device.

[0018] Figure 2 It is the jet component structure of the nickel-based high-temperature alloy non-vacuum furnace smelting device. Figure 1 ;

[0019] Figure 3 It is the jet component structure of the nickel-based high-temperature alloy non-vacuum furnace smelting device. Figure 2 ;

[0020] Figure 4 It is the shell structure diagram used by the nickel-based high-temperature alloy non-vacuum furnace smelting device.

[0021] Figure 5 The castings produced by the utility model.

[0022] 1 intermediate frequency furnace, 2 liquid steel, 3 air injection assembly, 31 annular pipe, 32 ceramic support, 33 air injection nozzle, 4 gas supply source, 5 protective gas layer, 6 inert gas, 7 shell, 8 pouring gate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Refer to the drawings of the utility model Figures 1 to 5 According to the nickel-based high-temperature alloy non-vacuum furnace smelting device provided by the embodiment of the utility model, the device comprises:

[0025] The intermediate frequency furnace 1 is open at the top, and the inside of the intermediate frequency furnace 1 is used for containing the metal raw material to be smelted;

[0026] The air injection assembly 3 is arranged at the furnace opening of the intermediate frequency furnace 1 through the ceramic support 32, and 10 air injection nozzles 33 are uniformly distributed on the air injection assembly 3 in the circumferential direction; the air injection nozzles 33 are arranged towards the inside of the intermediate frequency furnace, and the argon 6 sprayed by the air injection nozzles 33 forms a protective gas layer 5 above the smelted liquid steel;

[0027] The gas supply source 4 is actually an inert gas supply source, which is arranged outside the intermediate frequency furnace 1 in the form of a storage tank, and the gas supply source 4 is in pipeline communication with the air injection nozzles 33 and provides inert blowing gas for the air injection nozzles.

[0028] In other embodiments, the air injection assembly 3 is arranged with an annular pipe 31 at the top corresponding to the ceramic support 32, a plurality of air injection nozzles 33 are arranged at intervals on the inside of the annular pipe 31 and are in communication with the annular pipe 31, and the air injection nozzles 33 are arranged downwardly inclined, and the specific inclination angle is 30 to 40 degrees.

[0029] In other specific embodiments, the annular pipe and the air injection nozzles 33 are both formed of 2520 heat-resistant stainless steel material, and the gas outlet hole of the air injection nozzles 33 is 3mm to 5mm.

[0030] In other embodiments, the gas supply source 4 is stored by a high-pressure tank, and a gas circuit is connected between the gas supply source 4 and the annular pipe 31.

[0031] This utility model also discloses a non-vacuum furnace melting method for nickel-based high-temperature alloys, which uses the above-mentioned melting apparatus and includes the following steps:

[0032] Step 1: Prepare the furnace charge. Calculate the required alloy types and proportions based on the specific chemical composition requirements and alloy burn-off rate of the nickel-based high-temperature alloy grade. Weigh the materials strictly according to the proportions and heat and dry them to remove moisture and impurities. In Step 1, various metal raw materials to be smelted are heated and dried at 500°C in a roasting furnace, and then removed and placed separately.

[0033] Step Two: Raw Material Melting. The metal raw materials are placed sequentially in batches into the medium-frequency furnace for melting. The jetting assembly is placed and covered with the furnace top. An external gas supply source is connected, and inert gas is sprayed into the furnace opening through the jet nozzle. At this time, an inert gas protective layer is formed above the molten steel to reduce the contact between the metal in the furnace and the outside air. In Step Two, the external gas supply source is an argon source. The argon source covers the furnace opening through the jet nozzle at a pressure of 0.2-0.4 MPa. After the molten metal is melted, 0.3 kg of electrolytic manganese and 0.3 kg of metallic silicon are used for deoxidation, and the pouring temperature is adjusted to 1700-1720℃.

[0034] Step 3: Molten metal pouring. Before pouring, clean the inner cavity of the mold with hot water and let it stand for four hours. Then, with the mold pouring cup facing down, bake the mold at a temperature of 1050-1150℃ for 40-60 minutes. The pouring temperature is 1700-1720℃. Before pouring, inert gas needs to be blown into the mold, and then the mold is poured. In Step 3, before pouring, argon gas needs to be blown into the mold at a pressure of 0.2-0.4 MPa for 18-22 seconds, and then the mold is poured.

[0035] Specific application example: Taking the 824 pump body casting as an example, see attached document. Figure 5 As shown, the casting is made of high-temperature alloy 2.4607, with the following chemical composition requirements: Cr 19-21%, Mo 15-16%, C ≤0.03%, Fe ≤1.5%, Si ≤0.4%, Mn ≤0.4%, and the balance Ni. The melting and casting process is as follows:

[0036] 1. The total amount of ingredients is 150 kg, including 30.7 kg of metallic chromium, 23.7 kg of metallic molybdenum, and 95.6 kg of metallic nickel. Weigh these ingredients and set them aside as furnace charge. Dry the furnace charge in a roasting furnace at 500℃, then remove it and store it separately.

[0037] 2. The alloy is placed in the medium-frequency furnace in batches according to the order of nickel, molybdenum, and chromium for melting. Simultaneously, argon gas is blown into the furnace opening using the furnace top covering jet assembly. Figure 2 , 3As shown, 10 jet nozzles are evenly welded to the inside of the annular tube, tilted downwards at 30-40 degrees. A ceramic support sits below the annular tube. Both the annular tube and the jet nozzles are made of 2520 heat-resistant steel. The jet nozzles have an inner diameter of 5mm. Argon gas at a pressure of 0.2-0.4MPa is passed through the jet nozzles to cover the furnace opening, reducing the contact between the metal inside the furnace and the surrounding air, thereby reducing oxidation inclusions in the high-temperature alloy caused by gas absorption. After the molten metal is melted, 0.3kg of electrolytic manganese and 0.3kg of metallic silicon are used for deoxidation, and the pouring temperature is adjusted to 1700-1720℃, ready for pouring.

[0038] 3. Remove the baked shell from the furnace, connect it to an argon gas pipe, and blow argon gas into the cavity at a pressure of 0.2-0.4 MPa for about 20 seconds, then pour the gas and finally form the product.

[0039] This invention utilizes a non-vacuum induction furnace to melt nickel-based superalloys, resulting in castings free of oxide inclusions and casting defects such as peeling, with quality meeting standard requirements. It also satisfies the technological requirements of general precision casting manufacturers that lack a vacuum furnace to produce general nickel-based superalloy castings.

[0040] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-vacuum furnace melting apparatus for nickel-based high-temperature alloys, characterized in that, include: Medium frequency furnace (1), the top of the medium frequency furnace (1) is open, and the interior of the medium frequency furnace (1) is used to hold metal raw materials to be melted; A jet assembly (3) is provided with a ceramic support (32) on its bottom side ring. The jet assembly (3) is placed at the furnace mouth of the medium frequency furnace (1) through the ceramic support (32). The jet assembly (3) has multiple jet nozzles (33) evenly distributed in the circumferential direction. The jet nozzles (33) are arranged facing the inside of the medium frequency furnace. The inert gas (6) ejected by the jet nozzles (33) forms a protective gas layer (5) above the molten steel. Gas supply source (4) is arranged outside the medium frequency furnace (1). The gas supply source (4) is connected to the nozzle (33) pipeline and provides inert gas to the nozzle.

2. The non-vacuum furnace melting apparatus for nickel-based high-temperature alloys according to claim 1, characterized in that, The jet assembly (3) and the top of the corresponding ceramic support (32) are provided with an annular tube (31), and a plurality of jet nozzles (33) are spaced around the inner side of the annular tube (31) and communicate with the annular tube (31). The jet nozzles (33) are arranged at a downward angle.

3. The non-vacuum furnace melting apparatus for nickel-based high-temperature alloys according to claim 2, characterized in that, The jet nozzle (33) is made of heat-resistant steel, and the air outlet of the jet nozzle (33) is 3mm to 5mm.

4. The non-vacuum furnace melting apparatus for nickel-based high-temperature alloys according to claim 2, characterized in that, The gas supply source (4) is stored in a high-pressure tank, and a gas passage is connected between the gas supply source (4) and the annular pipe (31).

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