Solid solution aging method of aluminum bronze

Abstract

The invention discloses an aluminum bronze solid solution aging method which comprises the following steps: S1, carrying out solid solution treatment on an aluminum bronze part at the temperature of 860-880 DEG C, and carrying out oil cooling at the temperature of 40-80 DEG C; s2, oil stains on the aluminum bronze part after oil cooling are removed; and S3, the deoiled aluminum bronze part is subjected to aging treatment at the temperature of 360-470 DEG C and air-cooled to the room temperature. The method has the advantage that the hardness of the product is controlled to be HB170-200.

Description

Technical Field

[0001] The present invention relates to the technical field of solid solution aging, and in particular to a solid solution aging method for aluminum bronze. Background Art

[0002] Aluminum bronze is a copper-based alloy with aluminum as the primary alloying element, containing iron, manganese, and nickel. It is widely used in various products. Currently, a QAL10-3-1.5 aluminum bronze part is used in aviation products. Conventional methods typically use water cooling during solution treatment, followed by aging at 520-530°C. However, this approach can result in a sudden drop in hardness (below 170 HB). Currently, a QAL10-3-1.5 aluminum bronze product is required to have a hardness of HB170-200. Due to the high hardness requirement and the narrow hardness range, improved processing methods are needed. Chinese Patent Publication No. CN117867321A discloses an aluminum bronze material and its application, which includes solution treatment, water cooling, and aging treatments, and also achieves the target hardness value by adjusting relevant parameters. The applicant discovered that the aluminum bronze material used in the patent document is QAL10-4-4, and that using it to process QAL10-3-1.5 aluminum bronze resulted in a technical problem of mismatch between hardness and process parameters. That is, the process parameters in the patent document that showed a hardness value within the range of HB170-200 were not equally adaptable to QAL10-4-4. The applicant discovered that the patent document used an excessively high aging treatment temperature and water cooling after solution treatment, making it difficult for the hardness value of QAL10-4-4 to reach the range of HB170-200. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a solution aging method for aluminum bronze with a controlled product hardness between HB170 and HB200.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A solution aging method for aluminum bronze comprises the following steps: S1. Solution treat the aluminum bronze parts at 860-880°C and oil cool at 40-80°C. S2. Remove oil stains from aluminum bronze parts after oil cooling; S3. Aging treatment is performed on the degreased aluminum bronze parts at a temperature of 360-470°C, and air-cooling is performed to room temperature.

[0005] As a further improvement to the above technical solution: In step S1, the solution treatment time is 70 to 90 minutes.

[0006] In step S3, the aging treatment time is 90 to 120 minutes.

[0007] In step S1, the aluminum bronze part is QAL10-3-1.5 aluminum bronze with an aluminum content between 9.0% and 10%.

[0008] In step S2, a hydrocarbon cleaning agent is used to remove oil stains.

[0009] In step S3, the device used for the aging treatment is a pit-type resistance furnace.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a solution aging method for aluminum bronze, which uses oil cooling after solutionizing to achieve precise control of hardness to HB170-200. This method is technologically sound and avoids the problem of sudden hardness drop at conventional aging temperatures of 520-530°C. DETAILED DESCRIPTION

[0011] The present invention will be described in further detail below. Unless otherwise specified, the instruments and materials used in the present invention are commercially available.

[0012] Example 1 An aviation product is made of QAL10-3-1.5 aluminum bronze and requires a hardness of HB170-200.

[0013] The solution aging method of aluminum bronze in this embodiment includes the following steps: (1) Select QAL10-3-1.5 aluminum bronze bar with an Al content of 9.8%; (2) After turning to a specific shape, 1.5mm of hot turning allowance is reserved on one side; (3) Solution treatment of parts: Place the parts in a box-type resistance furnace to avoid direct contact with the furnace bottom plate. The solution temperature is 860 ° C, the holding time is 90 min, and oil cooling is performed after solution treatment (the oil temperature is set at 50 ° C); (4) Use hydrocarbon cleaning agent to clean and degrease the parts; (5) Aging treatment of parts: Place the parts in a pit-type resistance furnace for aging treatment. The parts are stably placed in the effective heating zone of the furnace. The temperature is set to 420℃, the holding time is 95 minutes, and then air-cooled to room temperature.

[0014] (6) Check the hardness of the parts and grind them flat with a grinding machine and sandpaper. The grinding depth should be ≤1mm. The hardness test was carried out using conventional technical means, and the hardness was HB185. Conclusion: qualified.

[0015] Comparative Example 1 (different aging temperature from Example 1) The solution aging method of aluminum bronze in this comparative example comprises the following steps: (1) Select QAL10-3-1.5 aluminum bronze bar with an Al content of 9.8%; (2) After turning to a specific shape, 1.5mm of hot turning allowance is reserved on one side; (3) Solution treatment of parts: Place the parts in a box-type resistance furnace to avoid direct contact with the furnace bottom plate. The solution temperature is 860 ° C, the holding time is 90 min, and oil cooling is performed after solution treatment (the oil temperature is set at 50 ° C); (4) Use hydrocarbon cleaning agent to clean and degrease the parts; (5) Aging treatment of parts: Place the parts in a pit-type resistance furnace for aging treatment. The parts are stably placed in the effective heating zone of the furnace. The temperature is set to 530°C, the holding time is 95 minutes, and then air-cooled to room temperature.

[0016] (6) Check the hardness of the parts and grind them flat with a grinding wheel and sandpaper. The grinding depth should be ≤1mm.

[0017] The hardness test was carried out using conventional technical means, and the hardness was HB165. Conclusion: Unqualified.

[0018] Comparative Example 2 (different solution treatment medium, temperature, and aging treatment temperature from Example 1) The solution aging method of aluminum bronze in this comparative example comprises the following steps: (1) Select QAL10-3-1.5 aluminum bronze bar with an Al content of 9.8%; (2) After turning to a specific shape, 1.5mm of hot turning allowance is reserved on one side; (3) Solution treatment of parts: Place the parts in a box-type resistance furnace to avoid direct contact with the furnace bottom plate. The solution temperature is 860 ° C, the holding time is 90 min, and water cooling is performed after solution treatment (the water temperature is set at 25 ° C); (4) Aging treatment of parts: Place the parts in a pit-type resistance furnace for aging treatment. The parts are stably placed in the effective heating zone of the furnace. The temperature is set to 530°C, the holding time is 95 minutes, and then air-cooled to room temperature.

[0019] (5) Check the hardness of the parts and grind them flat with a grinding wheel and sandpaper. The grinding depth should be ≤1mm. The hardness test was carried out using conventional technical means, and the hardness was HB163. Conclusion: Unqualified.

[0020] Comparative Example 3 (different solution treatment medium and temperature from Example 1) The solution aging method of aluminum bronze in this comparative example comprises the following steps: (1) Select QAL10-3-1.5 aluminum bronze bar with an Al content of 9.8%; (2) After turning to a specific shape, 1.5mm of hot turning allowance is reserved on one side; (3) Solution treatment of parts: Place the parts in a box-type resistance furnace to avoid direct contact with the furnace bottom plate. The solution temperature is 860 ° C, the holding time is 90 min, and water cooling is performed after solution treatment (the water temperature is set at 25 ° C); (4) Aging treatment of parts: Place the parts in a pit-type resistance furnace for aging treatment. The parts are stably placed in the effective heating zone of the furnace. The temperature is set to 420°C, the holding time is 95 minutes, and then air-cooled to room temperature.

[0021] (5) Check the hardness of the parts and grind them flat with a grinding wheel and sandpaper. The grinding depth should be ≤1mm. The hardness test was carried out using conventional technical means, and the hardness was HB215. Conclusion: Unqualified.

[0022] Comparative Example 4 (different solution treatment medium from Example 1) The solution aging method of aluminum bronze in this comparative example comprises the following steps: (1) Select QAL10-3-1.5 aluminum bronze bar with an Al content of 9.8%; (2) After turning to a specific shape, 1.5mm of hot turning allowance is reserved on one side; (3) Solution treatment of parts: Place the parts in a box-type resistance furnace to avoid direct contact with the furnace bottom plate. The solution temperature is 860 ° C, the holding time is 90 min, and water cooling is performed after solution treatment (the water temperature is set at 50 ° C); (4) Aging treatment of parts: Place the parts in a pit-type resistance furnace for aging treatment. The parts are stably placed in the effective heating zone of the furnace. The temperature is set to 420°C, the holding time is 95 minutes, and then air-cooled to room temperature.

[0023] (5) Check the hardness of the parts and grind them flat with a grinding wheel and sandpaper. The grinding depth should be ≤1mm. The hardness test was carried out using conventional technical means, and the hardness was HB210. Conclusion: Unqualified.

[0024] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A solution aging method for aluminum bronze, characterized by: The following steps are involved: S1. Solution treat the aluminum bronze parts at 860-880°C and oil cool at 40-80°C. S2. Remove oil stains from aluminum bronze parts after oil cooling; S3. Aging treatment is performed on the degreased aluminum bronze parts at a temperature of 360-470°C, and air-cooling is performed to room temperature.

2. The solution aging method for aluminum bronze according to claim 1, characterized in that: In step S1, the solution treatment time is 70 to 90 minutes.

3. The solution aging method for aluminum bronze according to claim 2, characterized in that: In step S3, the aging treatment time is 90 to 120 minutes.

4. The solution aging method for aluminum bronze according to any one of claims 1 to 3, characterized in that: In step S1, the aluminum bronze part is QAL10-3-1.5 aluminum bronze with an aluminum content between 9.0% and 10%.

5. The solution aging method for aluminum bronze according to any one of claims 1 to 3, characterized in that: In step S2, a hydrocarbon cleaning agent is used to remove oil stains.

6. The solution aging method for aluminum bronze according to any one of claims 1 to 3, characterized in that: In step S3, the device used for the aging treatment is a pit-type resistance furnace.