A GH4065A high temperature alloy inertia friction welding method

Abstract

The present application relates to the technical field of inertia friction welding, and specifically discloses a method for inertia friction welding of GH4065A high temperature alloy. The inertia friction welding method specifically comprises the following steps: pre-welding heat treatment of the base material: solution treatment at 1020-1100℃ for 0.5-8h; welding: moment of inertia 200-1800Kg·m 2 , rotation speed 300-1000r / min, primary welding pressure 200-1800kN, secondary welding pressure 300-2500kN; post-weld cooling: cooling rate 50-200℃ / min; post-weld aging heat treatment: post-weld aging heat treatment at 700-800℃ for 2-15h. This application is applicable to GH4065A deformed high-temperature alloy discs. By adjusting the pre-weld state of the parent material, the parameter selection of the welding process, the cooling method after welding and the performance recovery heat treatment process, the organization and comprehensive mechanical properties of the joint can be effectively optimized.

Description

Technical Field

[0001] The present application relates to the technical field of inertia friction welding, and more specifically, to an inertia friction welding method for GH4065A high temperature alloy. Background Art

[0002] In order to meet the needs of lightweight, high thrust-to-weight ratio and high stability of my country's aviation engines, interstage inertial friction welding of compressor discs has begun to develop rapidly as an advanced solid-phase welding method. Its weld seam has high precision, excellent performance, easy batch production and high material utilization, becoming the main trend of compressor technology development. The use of inertial friction welding technology to manufacture the core rotor components of the engine has better organization and comprehensive mechanical properties, which can improve the overall stiffness of rotor components, reduce escape loss and failure sources, effectively reduce the risk of thermal mechanical fatigue, improve the aerodynamic efficiency and stability of the compressor, reduce the number of fasteners, reduce the weight of the engine, and improve the utilization of materials, thereby achieving the goal of improving the thrust-to-weight ratio and reliability of the engine and reducing costs. However, there has not yet been a comprehensive breakthrough in the overall welding technology of high-performance discs, but related applications are imminent.

[0003] With the maturity of difficult-to-deform high-temperature alloy technology, GH4065A high-temperature alloy has developed rapidly and become the main material for high-performance aircraft engine rotors. It has higher temperature bearing capacity than GH4169 and more significant cost-effectiveness than powder high-temperature alloys.

[0004] With the improvement of thrust-to-weight ratio of domestic aircraft engines, GH4065A high-temperature alloy discs are required to be connected by inertia friction welding to achieve the purpose of weight reduction and improved thrust-to-weight ratio. However, there is currently no systematic process that covers inertia friction welding of GH4065A alloy discs and pre- and post-processing and effectively improves the comprehensive mechanical properties of the joints. Summary of the invention

[0005] The present application provides a GH4065A high-temperature alloy inertia friction welding method, which is suitable for GH4065A deformed high-temperature alloy discs. By adjusting the pre-welding state of the parent material, the parameter selection of the welding process, the cooling method after welding and the performance recovery heat treatment process, the organization and comprehensive mechanical properties of the joint can be effectively optimized.

[0006] The GH4065A high temperature alloy inertia friction welding method provided in this application adopts the following technical solution:

[0007] A GH4065A high temperature alloy inertia friction welding method, the inertia friction welding method specifically comprising the following steps:

[0008] Heat treatment of base material before welding: solution treatment at 1020-1100℃ for 0.5-8h;

[0009] Welding: Moment of inertia is 200-1800Kg·m 2 , speed 300-1000r / min, first-level welding pressure 200-1800kN, second-level welding pressure 300-2500kN;

[0010] Post-weld cooling: cooling rate is 50-200℃ / min;

[0011] Post-weld aging heat treatment: Post-weld aging heat treatment at 700-800℃ for 2-15h.

[0012] The present application can effectively optimize the organization and comprehensive mechanical properties of the joint by adjusting the pre-welding state of the parent material, the parameter selection of the welding process, the cooling method after welding and the performance recovery heat treatment process.

[0013] Since the pre-weld microstructure of the parent material is critical to the microstructure changes of the weld and heat-affected zone during the welding process, pre-weld heat treatment helps to adjust the physical and mechanical properties of the parent material and improve the weldability of the alloy. It also affects the stress distribution, mechanical properties and yield rate of the welded joint, and also determines the selection space of the post-weld aging heat treatment process. The parameter selection of the welding process can be used to adjust the heat input and effectively obtain a joint with good weldability. The cooling method after welding helps to adjust the distribution, quantity and morphology of the precipitated phase in the joint structure. Post-weld aging heat treatment further comprehensively regulates the microstructure and comprehensive mechanical properties of the joint and the parent material.

[0014] Optionally, in the pre-welding heat treatment of the base material, solution treatment is performed at 1050-1070° C. for 0.5-8 h.

[0015] In a specific embodiment, in the pre-weld heat treatment of the base material, the solid solution is carried out at 1020°C, 1050°C, 1070°C, and 1110°C for 0.5-8h.

[0016] In some specific implementation schemes, in the pre-weld heat treatment of the base material, the solid solution is carried out at 1020-1050°C, 1020-1070°C, 1050-1100°C, or 1070-1100°C for 0.5-8h.

[0017] Optionally, in the pre-welding heat treatment of the base material, the solid solution time is 1-5h.

[0018] In a specific embodiment, in the pre-weld heat treatment of the base material, the solid solution time is 0.5h, 1h, 5h, or 8h.

[0019] In some specific embodiments, in the pre-weld heat treatment of the base material, the solid solution time is 0.5-1h, 0.5-5h, 1-8h, or 5-8h.

[0020] Optionally, in the pre-welding heat treatment of the base material, after the solid solution treatment, aging is performed at 700-790°C for 2-15h.

[0021] Optionally, in the pre-welding heat treatment of the base material, the temperature of the aging treatment after the solid solution treatment is 730-780°C.

[0022] In a specific embodiment, in the pre-weld heat treatment of the base material, the temperature of the aging treatment after the solid solution is 700°C, 730°C, 780°C, or 790°C.

[0023] In some specific embodiments, in the pre-weld heat treatment of the base material, the temperature of the aging treatment after the solid solution treatment is 700-730°C, 700-780°C, 730-790°C, or 780-790°C.

[0024] Optionally, in the pre-welding heat treatment of the base material, the aging treatment time is 6-10 hours.

[0025] In a specific embodiment, in the pre-weld heat treatment of the base material, the aging treatment time is 2h, 6h, 10h, or 15h.

[0026] In some specific implementation schemes, in the pre-weld heat treatment of the base material, the time of the aging treatment is 2-6h, 2-10h, 6-15h, or 10-15h.

[0027] Optionally, the moment of inertia is 1000-1200 Kg·m 2 .

[0028] In a specific embodiment, the moment of inertia is 200 Kg·m 2 , 1000Kg·m 2 , 1200Kg·m 2 、1800Kg·m 2 .

[0029] In some specific embodiments, the moment of inertia is 200-1000 Kg·m 2 , 200-1200Kg·m 2 1000-1200Kg·m 2 1000-1800Kg·m 2 1200-1800Kg·m 2 .

[0030] Optionally, the rotation speed is 600-800r / min.

[0031] In a specific embodiment, the rotation speed is 300r / min, 600r / min, 800r / min, 1000r / min.

[0032] In some specific embodiments, the rotation speed is 300-600 r / min, 300-800 r / min, 600-1000 r / min, 800-1000 r / min.

[0033] Optionally, the first-level welding pressure is 700-1200 kN.

[0034] In a specific embodiment, the primary welding pressure is 200 kN, 700 kN, 1000 kN, 1200 kN, or 1800 kN.

[0035] In some specific embodiments, the primary welding pressure is 200-700 kN, 200-1000 kN, 200-1200 kN, 700-1000 kN, 700-1800 kN, 1000-1200 kN, 1000-1800 kN, or 1200-1800 kN.

[0036] Optionally, the secondary welding pressure is 700-1500 kN.

[0037] In a specific embodiment, the secondary welding pressure is 300 kN, 700 kN, 1000 kN, 1500 kN, or 2500 kN.

[0038] In some specific embodiments, the secondary welding pressure is 300-700 kN, 300-1000 kN, 300-1500 kN, 700-1000 kN, 700-2500 kN, 1000-1500 kN, 1000-2500 kN, or 1500-2500 kN.

[0039] Optionally, the cooling rate is 70-100°C / min.

[0040] In a specific embodiment, the cooling rate is 50°C / min, 70°C / min, 100°C / min, or 200°C / min.

[0041] In some specific embodiments, the cooling rate is 50-70°C / min, 50-100°C / min, 70-200°C / min, 100-200°C / min.

[0042] Optionally, the temperature of the post-weld aging heat treatment is 730-780°C.

[0043] In a specific embodiment, the temperature of the post-weld aging heat treatment is 700°C, 730°C, 780°C, or 800°C.

[0044] In some specific embodiments, the temperature of the post-weld aging heat treatment is 700-730°C, 700-780°C, 730-800°C, or 780-800°C.

[0045] Optionally, the post-weld aging heat treatment time is 6-10 hours.

[0046] In a specific embodiment, the time of the post-weld aging heat treatment is 2h, 6h, 10h, or 15h.

[0047] In some specific embodiments, the time of the post-weld aging heat treatment is 2-6h, 2-10h, 2-15h, 6-10h, 6-15h, or 10-15h.

[0048] Optionally, the dimensions of the parent material are: outer diameter of the welded pipe is 60-400 mm, weld thickness is 6-15 mm, and surface roughness value (Ra) of the welded contact surface is 1.5-2.5.

[0049] Optionally, the weld strength coefficient of the welding joint produced by the inertia friction welding method reaches above 0.90.

[0050] In summary, this application has the following beneficial effects:

[0051] The present application can effectively optimize the organization and comprehensive mechanical properties of the joint by adjusting the pre-welding state of the parent material, the parameter selection of the welding process, the cooling method after welding and the performance recovery heat treatment process.

[0052] Since the pre-weld microstructure of the parent material is critical to the microstructure changes of the weld and heat-affected zone during the welding process, pre-weld heat treatment helps to adjust the physical and mechanical properties of the parent material and improve the weldability of the alloy. It also affects the stress distribution, mechanical properties and yield rate of the welded joint, and also determines the selection space of the post-weld aging heat treatment process. The parameter selection of the welding process can be used to adjust the heat input and effectively obtain a joint with good weldability. The cooling method after welding helps to adjust the distribution, quantity and morphology of the precipitated phase in the joint structure. Post-weld aging heat treatment further comprehensively regulates the microstructure and comprehensive mechanical properties of the joint and the parent material. DETAILED DESCRIPTION

[0053] Before describing the embodiments of the present application in detail, it should be understood that the terms used herein are only used for the purpose of describing specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the terms belong.

[0054] The present application provides a GH4065A high temperature alloy inertia friction welding method. The inertia friction welding method specifically comprises the following steps:

[0055] (1) Process the GH4065A high temperature alloy ring parts to the following dimensions: welding tube outer diameter 60-400mm, welding thickness 6-15mm, welding contact surface Ra1.5-2.5.

[0056] (2) Heat treatment of base material before welding: solution treatment at 1020-1100℃ for 0.5-8h, then aging at 700-790℃ for 0-15h.

[0057] (3) Welding process: moment of inertia 200-1800 kg·m 2 , rotation speed 300-1000r / min, first-level welding pressure 200-1800kN, second-level welding pressure 300-2500kN.

[0058] (4) Post-weld cooling: 50-200℃ / min.

[0059] (5) Post-weld aging heat treatment: Post-weld aging heat treatment at 700-800℃ for 2-15h.

[0060] The weld strength coefficient of the weld joints made by the inertia friction welding method of the present application all reaches above 0.90.

[0061] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be described clearly and completely in combination with the embodiments below. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0062] The present application is further described in detail below in combination with embodiments, comparative examples and performance test results. Example Example 1

[0063] This embodiment provides a GH4065A high temperature alloy inertia friction welding method. The inertia friction welding method specifically includes the following steps:

[0064] The outer diameter of the welded pipe is 120mm, the welding thickness is 8mm, the inner diameter is 104mm, the height is 120mm, and the welding contact surface is Ra2.0.

[0065] (1) Heat treatment of base material before welding: solution treatment at 1020℃ for 5h.

[0066] (2) Welding process: moment of inertia 1000 kg·m 2 , rotation speed 800r / min, first-level welding pressure 1000kN, second-level welding pressure 1000kN.

[0067] (4) Post-weld cooling: 13 minutes from 1020°C to 300°C, cooling rate is 70°C / min.

[0068] (5) Post-weld aging heat treatment: aging at 780℃ for 6h.

[0069] Example 2-39

[0070] Embodiments 2-39 respectively provide a GH4065A high temperature alloy inertia friction welding method. The inertia friction welding method. The above embodiment is different from embodiment 1 in that the parameters of each step are different, as shown in Table 1 and Table 2, and the remaining steps are the same as those of embodiment 1.

[0071] The differences of the above embodiments are as follows:

[0072] The difference between Example 2-4 and Example 1 is that the temperature of the solution treatment is different.

[0073] The difference between Examples 5-7 and Example 2 is that the time of the solution treatment is different.

[0074] The difference between Examples 8-11 and Example 2 is that the temperature of the aging treatment before welding is different.

[0075] The difference between Examples 12-14 and Example 10 is that the aging treatment time before welding is different.

[0076] The difference between Examples 15-17 and Example 10 is that the moment of inertia is different.

[0077] The difference between Examples 18-20 and Example 10 is that the rotation speed is different.

[0078] The difference between Examples 21-24 and Example 10 is that the primary welding pressure is different.

[0079] The difference between Examples 25-28 and Example 10 is that the secondary welding pressure is different.

[0080] The difference between Examples 29-31 and Example 10 is that the cooling rates after welding are different.

[0081] The difference between Examples 32-34 and Example 10 is that the temperature of the post-weld aging heat treatment is different.

[0082] The difference between Examples 35-37 and Example 10 is that the time of post-weld aging heat treatment is different.

[0083] The difference between Examples 38-39 and Example 10 is that the welding thickness is different, as follows:

[0084] The welded pipe of Example 38 has an outer diameter of 350 mm, a weld thickness of 6 mm, an inner diameter of 338 mm, a height of 120 mm, and a weld contact surface of Ra2.2.

[0085] The welded pipe of Example 39 has an outer diameter of 60 mm, a weld thickness of 15 mm, an inner diameter of 30 mm, a height of 80 mm, and a weld contact surface of Ra1.5.

[0086] Table 1 Parameters of each inertia friction welding method in the embodiment

[0087]

[0088] Table 2 Parameters of each inertia friction welding method in the embodiment

[0089] Comparative Example Comparative Example 1

[0090] Comparative Example 1 provides a GH4065A high temperature alloy inertia friction welding method. The difference between this comparative example and Example 10 is that the base material is not subjected to pre-welding heat treatment. The remaining steps are the same as those of Example 10. Comparative Example 2

[0091] Comparative Example 2 provides a GH4065A high temperature alloy inertia friction welding method. The difference between this comparative example and Example 10 is that the cooling rate after welding is 300°C / min. The remaining steps are the same as those of Example 10. Comparative Example 3

[0092] Comparative Example 3 provides a GH4065A high temperature alloy inertia friction welding method. The difference between this comparative example and Example 10 is that the base material is not subjected to post-weld aging heat treatment. The remaining steps are the same as those of Example 10.

[0093] Performance test results

[0094] The weld strength coefficients of the weld joints obtained by the welding methods of the above-mentioned embodiment and comparative example were tested respectively.

[0095] The calculation formula of strength coefficient is as follows: Strength coefficient (%) = weld tensile strength / parent material tensile strength × 100%. The tensile strength of the weld is tested by the method of pulling out the weld, and the tensile strength of the parent material is tested by the method of pulling out the parent material. The test results are shown in Table 3.

[0096] Table 3 Test results

[0097]

[0098] It can be seen from Table 3 that by comparing the results of the embodiments of the present application and the comparative examples, the present application can effectively optimize the organization and comprehensive mechanical properties of the joint by adjusting the pre-welding state of the parent material, the parameter selection of the welding process, the cooling method after welding and the performance recovery heat treatment process. The weld strength coefficient of the welded joint obtained in the present application reaches above 0.90.

[0099] By comparing the results of Examples 1-4, it can be seen that the temperature of the solution treatment of the pre-weld heat treatment of the parent material is controlled at 1020-1100°C, and the weld strength coefficient of the obtained weld joint is above 0.90. Furthermore, the temperature of the solution treatment of the pre-weld heat treatment of the parent material is controlled at 1050-1070°C, which can further improve the weld strength coefficient of the weld joint.

[0100] By comparing the results of Examples 2 and 5-7, it can be seen that the time of the solid solution treatment of the pre-welding heat treatment of the parent material is controlled to 0.5-8h, and the weld strength coefficient of the obtained weld joint reaches above 0.90. Furthermore, the time of the solid solution treatment of the pre-welding heat treatment of the parent material is controlled to 1-5h, which can further improve the weld strength coefficient of the weld joint.

[0101] By comparing the results of Examples 2 and 8-11, it can be seen that the temperature of the aging treatment of the pre-weld heat treatment of the parent material is controlled at 700-790°C, and the weld strength coefficient of the obtained weld joint is above 0.90. Furthermore, the temperature of the aging treatment of the pre-weld heat treatment of the parent material is controlled at 730-780°C, which can further improve the weld strength coefficient of the weld joint.

[0102] By comparing the results of Examples 10, 12-14, it can be seen that the aging treatment time of the pre-weld heat treatment of the parent material is controlled within 2-15 hours, and the weld strength coefficient of the obtained weld joint is above 0.90. Furthermore, the aging treatment time of the pre-weld heat treatment of the parent material is controlled within 6-10 hours, which can further improve the weld strength coefficient of the weld joint.

[0103] By comparing the results of Examples 10, 15-17, it can be seen that the moment of inertia is controlled within the range of 200-1800 kg·m 2 The weld strength coefficient of the weld joint obtained is above 0.90. Furthermore, the moment of inertia is controlled at 1000-1200Kg·m 2 , which can further improve the weld strength coefficient of the welding joint.

[0104] By comparing the results of Examples 10, 18-20, it can be seen that when the rotation speed is controlled at 300-1000 r / min, the weld strength coefficient of the weld joint obtained is above 0.90. Furthermore, when the rotation speed is controlled at 600-800 r / min, the weld strength coefficient of the weld joint can be further improved.

[0105] By comparing the results of Examples 10, 21-24, it can be seen that the weld strength coefficient of the weld joint obtained by controlling the primary welding pressure to 200-1800 kN is above 0.90. Furthermore, controlling the primary welding pressure to 700-1200 kN can further improve the weld strength coefficient of the weld joint.

[0106] By comparing the results of Examples 10, 25-28, it can be seen that when the secondary welding pressure is controlled at 300-2500 kN, the weld strength coefficient of the obtained weld joint reaches above 0.90. Furthermore, when the secondary welding pressure is controlled at 700-1500 kN, the weld strength coefficient of the weld joint can be further improved.

[0107] By comparing the results of Examples 10, 30-32, it can be seen that the weld strength coefficient of the weld joint obtained by controlling the cooling rate after welding to 50-200°C / min can reach above 0.90. Furthermore, controlling the cooling rate after welding to 70-100°C / min can further improve the weld strength coefficient of the weld joint.

[0108] By comparing the results of Examples 10 and 32-34, it can be seen that the weld strength coefficient of the weld joint obtained by controlling the temperature of the post-weld aging heat treatment at 700-800°C is above 0.90. Furthermore, controlling the temperature of the post-weld aging heat treatment at 730-780°C can further improve the weld strength coefficient of the weld joint.

[0109] By comparing the results of Examples 10 and 35-37, it can be seen that the weld strength coefficient of the weld joint obtained by controlling the time of post-weld aging heat treatment to 2-15 hours is greater than 0.90. Furthermore, controlling the time of post-weld aging heat treatment to 6-10 hours can further improve the weld strength coefficient of the weld joint.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A GH4065A high temperature alloy inertia friction welding method, characterized in that: The inertia friction welding method specifically comprises the following steps: Heat treatment of base material before welding: solution treatment at 1020-1100℃ for 0.5-8h; Welding: Moment of inertia is 200-1800Kg·m 2 , speed 300-1000r / min, first-level welding pressure 700-1200kN, second-level welding pressure 700-1500kN; Post-weld cooling: cooling rate is 70-100℃ / min; Post-weld aging heat treatment: 2-15h at 700-800℃; The dimensions of the base material are: the outer diameter of the welded pipe is 60-400 mm, the weld thickness is 6-15 mm, and the surface roughness value of the welded contact surface is 1.5-2.5; The weld strength coefficient of the weld joints made by the inertia friction welding method is above 0.90; The calculation method of the weld strength coefficient is as follows: strength coefficient (%) = weld tensile strength / base material tensile strength × 100%.

2. The inertia friction welding method according to claim 1, characterized in that: In the pre-welding heat treatment of the base material, the solid solution time is 1-5h.

3. The inertia friction welding method according to claim 1, characterized in that: In the pre-weld heat treatment of the base material, after the solid solution treatment, aging is performed at 700-790°C for 2-15h.

4. The inertia friction welding method according to claim 3, characterized in that: In the pre-welding heat treatment of the base material, the aging treatment time is 6-10 hours.

5. The inertia friction welding method according to claim 1, characterized in that: The moment of inertia is 1000-1200 Kg·m 2 .

6. The inertia friction welding method according to claim 1, characterized in that: The time of the post-weld aging heat treatment is 6-10 hours.

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