A method for preparing a self-heating high-temperature alloy blade

Abstract

This invention relates to a method for preparing a self-heating high-temperature alloy blade. The method involves pre-installing a copper-magnesium-steel composite component inside the high-temperature alloy blade. This component can increase the operating temperature of the high-temperature alloy blade by approximately 15%, enabling the blade to maintain normal operation for extended periods under extreme high-temperature conditions. The copper-magnesium-steel composite component is composited in two steps. The first step involves low-temperature, small-deformation assisted by an electrical pulse, which melts magnesium and bonds it to the interface of copper and steel. Simultaneously, recrystallization occurs in both steel and copper, refining the grain size. The second step involves high-temperature, large-deformation using a heat source. During this process, the copper and steel undergo significant plastic deformation, resulting in a tighter interface bond, thus obtaining the copper-magnesium-steel composite component.

Description

Technical Field

[0001] This invention relates to a method for preparing self-heating high-temperature alloy blades, belonging to the field of heat treatment technology. Background Technology

[0002] International researchers have been working on functionally graded materials (FJTs) combining copper and steel, exploring their mechanical properties. This material combines the unique characteristics of both copper and steel—the heat resistance of steel and the thermal conductivity of copper—and holds promise for future applications in manufacturing combustion chamber components for aircraft and rocket engines, effectively preventing engine overheating damage.

[0003] High-temperature alloy turbine blades are key components of aero engines. Both domestic and international efforts have been focused on increasing their operating temperature, primarily through the continuous development of new materials. However, this often results in long development cycles and low economic efficiency. Summary of the Invention

[0004] The present invention addresses the aforementioned existing technical situation by providing a method for preparing a self-heating high-temperature alloy blade. The purpose is to pre-place a copper-magnesium-steel composite component inside the high-temperature alloy blade. The presence of this component can increase the operating temperature of the high-temperature alloy blade, enabling the high-temperature alloy blade with this structure to maintain normal operation for a long time under extreme high-temperature conditions.

[0005] To achieve the above objectives, the technical solution of this invention is as follows:

[0006] The steps of the preparation method of the self-heating high-temperature alloy blade proposed in this invention are as follows:

[0007] Step 1: Using machining methods, parallel grooves are machined on the surfaces of two high-temperature alloy plates of the same specifications and dimensions. The grooves on the surfaces of the two high-temperature alloy plates are positioned corresponding to each other. The grooves run through the entire surface of the high-temperature alloy plates to the edge. The width of the grooves is 1 / 10 of the width of the high-temperature alloy plates, and the depth of the grooves is 1 / 10 of the thickness of the high-temperature alloy plates. After machining, the surfaces of the two high-temperature alloy plates and the grooves are thoroughly cleaned with gasoline, acetone and alcohol.

[0008] Step 2: Lay magnesium foil on the surface of the two high-temperature alloy plates and the groove. Then, place a copper rod in the groove of one of the high-temperature alloy plates. The length and width of the copper rod are consistent with the groove to form a transition fit. The height of the copper rod is 2.5 to 3 times the depth of the groove. Then, invert the other high-temperature alloy plate and join them together so that the copper rod is placed in the cavity formed by the corresponding grooves on the upper and lower parts of the two high-temperature alloy plates, thus forming a steel-copper composite plate.

[0009] Step 3: Place the steel-copper composite plate in a vacuum chamber and heat it. Clamp a pulse power generator between opposite edges of the high-temperature alloy plate. Place pressure heads on the upper and lower surfaces of the steel-copper composite plate. While the steel-copper composite plate is energized, apply opposing compressive stress to the upper and lower surfaces of the steel-copper composite plate. The energizing process takes 10-15 minutes. The heating temperature of the steel-copper composite plate is 500-700℃, and the compressive stress is 300-700MPa. During this process, the magnesium foil melts, the copper rod undergoes plastic deformation, and the distance between the upper and lower high-temperature alloy plates on the steel-copper composite plate is reduced by 50% compared to before the pressure is applied.

[0010] Step 4: Place the steel-copper composite plate obtained after step 3 into an electric resistance furnace and heat it at a temperature of 700-1000℃ for 30-40 minutes. Then place it into a rolling mill for rolling, with a reduction of 5-10% per pass, until the gap between the two high-temperature alloy plates of the steel-copper composite plate closes, thus obtaining a copper-magnesium-steel composite component.

[0011] Step 5: Place the copper-magnesium-steel composite component obtained after processing in Step 4 at the center of a cylindrical stainless steel cladding. The height of the cladding cavity is twice the length of the copper-magnesium-steel composite component in that direction. Fill the gap between the copper-magnesium-steel composite component and the inner wall of the cladding with high-temperature alloy powder. Then, seal the cladding by welding and vacuuming. Heat the cladding to 1000-1050℃ and hold for 1 hour. Then, use a hydraulic press in an atmospheric environment to perform one direct forging to obtain a blade blank with a copper-magnesium-steel composite component as the core.

[0012] Step 6: Machining the blade blank to finally obtain the high-temperature alloy blade.

[0013] In practice, the material grade of the high-temperature alloy plate mentioned in step one is 4340. Furthermore, the length of the high-temperature alloy plate is 70-100mm, the width is 30-50mm, and the thickness is 7-10mm.

[0014] In practice, the thickness of the magnesium foil mentioned in step two is 0.1 mm.

[0015] The features and beneficial effects of the technical solution of this invention are as follows:

[0016] I. The technical solution of this invention pre-places a copper-magnesium-steel composite component inside a high-temperature alloy blade. This component can increase the operating temperature of the high-temperature alloy blade by approximately 15%, enabling the high-temperature alloy blade with this structure to maintain normal operation for extended periods under extreme high-temperature conditions. In this invention, the copper-magnesium-steel composite component is composited through two steps. The first step involves low-temperature, small-deformation assisted by an electric pulse, which melts the magnesium and allows it to bond with the copper and steel interface. Simultaneously, recrystallization occurs in both the steel and copper, refining the grain size. The second step involves high-temperature, large-deformation using a heat source. During this process, the copper and steel interface bond more tightly through large plastic deformation, thus obtaining the copper-magnesium-steel composite component.

[0017] Second, in the preparation of blade blanks, the present invention directly places the copper-magnesium-steel composite component into the powder high-temperature alloy and performs direct one-pass forging. Since it is carried out in an atmospheric environment, the microstructure does not have enough time to grow, resulting in a refined microstructure.

[0018] Third, the present invention uses a plastic forming method to combine four metals—copper, steel, magnesium, and high-temperature alloys—under different energy field combinations by means of electric field, temperature field, and strain field. Detailed Implementation

[0019] The technical solution of the present invention will be further described in detail below with reference to the embodiments:

[0020] Example

[0021] The method for preparing self-heating high-temperature alloy blades using the technical solution of this invention has the following steps:

[0022] Step 1: Prepare two high-temperature alloy plates of the same specifications and dimensions, with a material grade of 4340. The length of the high-temperature alloy plate is 70-100mm, the width is 30-50mm, and the thickness is 7-10mm. Machining is used to process grooves parallel to the long side on the surface of the two high-temperature alloy plates. The number of grooves is 2-8. The grooves on the surface of the two high-temperature alloy plates correspond to each other. The grooves run through the entire surface of the high-temperature alloy plates to the edge. The width of the groove is 1 / 10 of the width of the high-temperature alloy plate, and the depth of the groove is 1 / 10 of the thickness of the high-temperature alloy plate. After machining, the surface of the two high-temperature alloy plates and the surface of the grooves are thoroughly cleaned with gasoline, acetone, and alcohol.

[0023] Step 2: Lay magnesium foil with a thickness of 0.1mm on the surface of the two high-temperature alloy plates and the groove. Then, place a copper rod in the groove of one of the high-temperature alloy plates. The length and width of the copper rod are consistent with the groove to form a transition fit. The height of the copper rod is 3 times the depth of the groove. Then, invert the other high-temperature alloy plate and join them together so that the copper rod is placed in the cavity formed by the corresponding grooves on the upper and lower parts of the two high-temperature alloy plates, thus forming a steel-copper composite plate.

[0024] Step 3: Place the steel-copper composite plate in a vacuum chamber and heat it. Clamp a pulse power generator between opposite edges of the high-temperature alloy plate. Place pressure heads on the upper and lower surfaces of the steel-copper composite plate. While the steel-copper composite plate is energized, apply opposing compressive stress to the upper and lower surfaces of the steel-copper composite plate. The energizing process takes 10-15 minutes. The heating temperature of the steel-copper composite plate is 500-700℃, and the compressive stress is 300-700MPa. During this process, the magnesium foil melts, the copper rod undergoes plastic deformation, and the distance between the upper and lower high-temperature alloy plates on the steel-copper composite plate is reduced by 50% compared to before the pressure is applied.

[0025] Step 4: Place the steel-copper composite plate obtained after step 3 into an electric resistance furnace and heat it at a temperature of 700-1000℃ for 30-40 minutes. Then place it into a rolling mill for rolling, with a reduction of 5-10% per pass, until the gap between the two high-temperature alloy plates of the steel-copper composite plate closes, thus obtaining a copper-magnesium-steel composite component.

[0026] Step 5: Place the copper-magnesium-steel composite component obtained after processing in Step 4 at the center of a cylindrical stainless steel cladding. The long side of the copper-magnesium-steel composite component is parallel to the central axis of the cladding. The height of the inner cavity of the cladding is twice the length of the copper-magnesium-steel composite component in that direction. Fill the gap between the copper-magnesium-steel composite component and the inner wall of the cladding with high-temperature alloy powder. Then, seal the cladding by welding and vacuuming. Then, heat the cladding to 1000-1050℃ and hold it for 1 hour. Then, use a hydraulic press in an atmospheric environment to perform one direct forging to obtain a blade blank with a copper-magnesium-steel composite component as the core.

[0027] Step 6: Machining the blade blank to finally obtain the high-temperature alloy blade.

Claims

1. A method for preparing a self-heating high-temperature alloy blade, characterized in that: The preparation method involves the following steps: Step 1: Using machining methods, parallel grooves are machined on the surfaces of two high-temperature alloy plates of the same specifications and dimensions. The grooves on the surfaces of the two high-temperature alloy plates are positioned corresponding to each other. The grooves run through the entire surface of the high-temperature alloy plates to the edge. The width of the grooves is 1 / 10 of the width of the high-temperature alloy plates, and the depth of the grooves is 1 / 10 of the thickness of the high-temperature alloy plates. After machining, the surfaces of the two high-temperature alloy plates and the grooves are thoroughly cleaned with gasoline, acetone and alcohol. Step 2: Lay magnesium foil on the surface of the two high-temperature alloy plates and the groove. Then, place a copper rod in the groove of one of the high-temperature alloy plates. The length and width of the copper rod are consistent with the groove to form a transition fit. The height of the copper rod is 2.5 to 3 times the depth of the groove. Then, invert the other high-temperature alloy plate and join them together so that the copper rod is placed in the cavity formed by the corresponding grooves on the upper and lower parts of the two high-temperature alloy plates, thus forming a steel-copper composite plate. Step 3: Place the steel-copper composite plate in a vacuum chamber and heat it. Clamp a pulse power generator between opposite edges of the high-temperature alloy plate. Place pressure heads on the upper and lower surfaces of the steel-copper composite plate. While the steel-copper composite plate is energized, apply opposing compressive stress to the upper and lower surfaces of the steel-copper composite plate. The energizing process takes 10-15 minutes. The heating temperature of the steel-copper composite plate is 500-700℃, and the compressive stress is 300-700MPa. During this process, the magnesium foil melts, the copper rod undergoes plastic deformation, and the distance between the upper and lower high-temperature alloy plates on the steel-copper composite plate is reduced by 50% compared to before the pressure is applied. Step 4: Place the steel-copper composite plate obtained after step 3 into an electric resistance furnace and heat it at a temperature of 700-1000℃ for 30-40 minutes. Then place it into a rolling mill for rolling, with a reduction of 5-10% per pass, until the gap between the two high-temperature alloy plates of the steel-copper composite plate closes, thus obtaining a copper-magnesium-steel composite component. Step 5: Place the copper-magnesium-steel composite component obtained after processing in Step 4 at the center of a cylindrical stainless steel cladding. The height of the cladding cavity is twice the length of the copper-magnesium-steel composite component in that direction. Fill the gap between the copper-magnesium-steel composite component and the inner wall of the cladding with high-temperature alloy powder. Then, seal the cladding by welding and vacuuming. Heat the cladding to 1000-1050℃ and hold for 1 hour. Then, use a hydraulic press in an atmospheric environment to perform one direct forging to obtain a blade blank with a copper-magnesium-steel composite component as the core. Step 6: Machining the blade blank to finally obtain the high-temperature alloy blade.

2. The method for preparing the self-heating high-temperature alloy blade according to claim 1, characterized in that: The material grade of the high-temperature alloy plate mentioned in step one is 4340.

3. The method for preparing the self-heating high-temperature alloy blade according to claim 2, characterized in that: The high-temperature alloy plate mentioned in step one has a length of 70-100mm, a width of 30-50mm, and a thickness of 7-10mm.

4. The method for preparing the self-heating high-temperature alloy blade according to claim 1, characterized in that: The thickness of the magnesium foil mentioned in step two is 0.1 mm.