A toughening treatment process for ZL205A aluminum alloy

Abstract

The application discloses a kind of toughening treatment processes of ZL205A aluminum alloy, comprising the following steps: step 1: selecting ZL205A aluminum alloy material;Step 2: the material after surface treatment is placed in heating furnace, so that it reaches uniform heating state;Step 3: after holding ends, using inert gas rapidly material is cooled to room temperature, to avoid excessive grain growth and deformation;Step 4: the material after step 3 treatment is stretched deformation;Step 5: enhance the toughening effect of material after step 4 treatment;Step 6: the material after step 5 treatment is aging treatment.The processing parameters of the application are stable and controllable, the strengthening and toughening effect is remarkable, the processing time is short, the applicable range is wide, through experimental verification, the strength and toughness of ZL205A aluminum alloy material after the treatment process proposed in the patent are significantly improved, and it has good corrosion resistance and reliability, can satisfy the requirement of material performance in different fields.

Description

Technical Field

[0001] This invention relates to the field of alloy preparation technology, specifically to a strengthening and toughening process for ZL205A aluminum alloy. Background Technology

[0002] ZL205A aluminum alloy is a commonly used high-strength aluminum alloy widely used in aerospace, automotive, and shipbuilding industries. However, its strength and toughness still have room for improvement, requiring further optimization of its processing technology to meet the strength and toughness requirements of different fields.

[0003] There are many types of Al-Cu high-strength cast aluminum alloys, among which ZL205A alloy is a typical example. The comprehensive performance of ZL205A alloy surpasses that of similar alloys internationally, making a significant contribution to the development of my country's aerospace and civilian industries. However, due to the complex composition, wide crystallization temperature range, and difficulty in controlling the casting process of ZL205A alloy, casting defects such as inclusions, cracks, and shrinkage cavities are easily generated during the smelting process. Summary of the Invention

[0004] The purpose of this invention is to provide a strengthening and toughening process for ZL205A aluminum alloy to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a strengthening and toughening treatment process for ZL205A aluminum alloy, comprising the following steps:

[0006] This invention relates to a toughening process for ZL205A aluminum alloy, belonging to the field of metal material processing technology.

[0007] Existing processing techniques for ZL205A aluminum alloy suffer from a trade-off between strength and toughness, necessitating further optimization to improve the material's overall performance. This invention proposes a strengthening and toughening process for ZL205A aluminum alloy, comprising the following steps:

[0008] Step 1: Select ZL205A aluminum alloy material, cut it to the required size, and then perform surface treatment to remove surface oxides;

[0009] Step 2: Place the surface-treated material into a heating furnace at a heating rate of 30℃ / min-50℃ / min until the material temperature reaches 450℃-480℃. Hold the material at this temperature for 2-4 hours to ensure uniform heating.

[0010] Step 3: After the end of the heat preservation, the material is moved to a cooling device using nitrogen, the temperature of the cooling device is controlled at 18-25 DEG C, the cooling device is started and the cooling rate is controlled, the cooling rate is selected according to the characteristics of the material and the processing requirements, and the cooling rate is 30 DEG C / s-50 DEG C / s, and during the cooling process, inert gas is continuously sprayed on the surface of the material to protect the surface from oxidation and pollution, and the nitrogen flow should be between 2L / min-5L / min;

[0011] Step 4: The material treated in step 3 is stretched, and the stretching parameters are: the stretching speed is 0.5mm / s-2mm / s, the stretching amount is 10%-25%, in order to avoid the surface oxidation and pollution of the material during the stretching process, the surface of the material is protected by inert gas, the inert gas flow is: 2L / min-5L / min, the indoor environment: temperature: 20-25 DEG C, humidity: 30%-50%;

[0012] Step 5: The toughness of the material treated in step 4 is enhanced;

[0013] Step 6: The material treated in step 5 is aged, and the aging parameters are: the treatment temperature is 120 DEG C-160 DEG C, and the treatment time is 8-12 hours.

[0014] The specific operation steps are: the material treated in step 4 is put into the furnace for heating, first, the furnace temperature is adjusted to 180 DEG C-220 DEG C, and kept for 20-30 minutes, so that the temperature of the material is uniformly reached to the target temperature, then, the material is heat preserved for 2-4 hours; after the end of the heat preservation, the material is quickly taken out of the furnace and rapidly cooled to fix the organizational structure and performance of the material, and the water quenching is used for rapid cooling; the material is again put into the furnace for heating treatment, first, the furnace temperature is adjusted to 150 DEG C-180 DEG C, and kept for 20-30 minutes, so that the temperature of the material is uniformly reached to the target temperature, then, the material is heat preserved for 1-2 hours to achieve the best strengthening and toughening effect; after the end of the heat preservation, the material is quickly taken out of the furnace and rapidly cooled by oil quenching to fix the organizational structure and performance of the material.

[0015] By optimizing the treatment parameters, including the control and adjustment of heating temperature, heating time, cooling rate, stretching parameters and aging treatment parameters, the treatment process is stable and controllable, and the fluctuation of the material performance caused by unstable treatment parameters is avoided, and the surface oxidation and pollution of the material are effectively avoided by using nitrogen to protect the surface of the material, thereby improving the quality and reliability of the material.

[0016] The ZL205A aluminum alloy strengthening and toughening treatment process has the beneficial effects that:

[0017] 1. The processing parameters of this invention are stable and controllable, the toughening effect is significant, the processing time is short, and the application range is wide. Through experimental verification, the ZL205A aluminum alloy material after the processing process proposed in this patent has significantly improved strength and toughness, and at the same time has good corrosion resistance and reliability, which can meet the material performance requirements of different fields.

[0018] 2. The processing time of the present invention is relatively short. After steps such as solution treatment, water quenching, artificial aging treatment and rapid cooling, the toughening effect of the material can be significantly improved, thereby improving the production efficiency of the material and reducing the production cost. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: A strengthening and toughening treatment process for ZL205A aluminum alloy, comprising the following steps:

[0021] ZL205A aluminum alloy material is selected and cut into the required size, and then surface treatment is performed to remove surface oxides;

[0022] The surface-treated material is placed in a heating furnace at a heating rate of 40℃ / min until the material temperature reaches 460℃. The holding time is 3 hours to ensure uniform heating.

[0023] After the heat preservation is completed, the material is rapidly cooled to room temperature using an inert gas to avoid excessive grain growth and deformation;

[0024] Start the cooling equipment and control the cooling rate at 40℃ / s. During the cooling process, continuously spray nitrogen gas onto the material surface to protect it from oxidation and contamination. The nitrogen gas flow rate is 3L / min.

[0025] The material after step 3 was subjected to tensile deformation at a stretching speed of 1 mm / s and a stretching amount of 20%. To avoid surface oxidation and contamination during the stretching process, argon gas was used to protect the material surface at a flow rate of 3 L / min. The indoor environment was: temperature 22℃ and humidity 40%.

[0026] Enhance the toughening effect of the material after step 4 treatment;

[0027] Put the material treated in step 3 into the furnace for heating, first, adjust the furnace temperature to 200℃ and keep for 30 minutes, make the material temperature uniform to the target temperature, then, keep the material for 3 hours;

[0028] After the holding is finished, quickly take the material out of the furnace and perform rapid cooling to fix the material's organizational structure and performance, use water quenching to perform rapid cooling;

[0029] Put the material into the furnace again for heating treatment, first, adjust the furnace temperature to 160℃ and keep for 30 minutes, make the material temperature uniform to the target temperature, then, keep the material for 1 hour to achieve the best toughening effect;

[0030] After the holding is finished, quickly take the material out of the furnace and perform rapid cooling using oil quenching to fix the material's organizational structure and performance;

[0031] Perform aging treatment on the material treated in step 5, the treatment temperature is 140℃ and the treatment time is 10 hours.

[0032] Experimental data: after the above treatment process, the tensile strength of ZL205A aluminum alloy is 480MPa, the yield strength is 410MPa, and the elongation is 12%.

[0033] Example 2: A toughening treatment process for ZL205A aluminum alloy, including the following steps:

[0034] Select ZL205A aluminum alloy material and cut it into the required size, then perform surface treatment to remove surface oxides;

[0035] Put the material treated on the surface into the heating furnace, the heating rate is 30℃ / min, until the material temperature reaches 470℃, the holding time is 4 hours, to make it reach a uniform heating state;

[0036] After the holding is finished, use inert gas to quickly cool the material to room temperature to avoid excessive grain growth and deformation;

[0037] Start the cooling equipment and control the cooling rate to be 50℃ / s, during the cooling process, continuously spray nitrogen gas on the surface of the material to protect it from oxidation and contamination, the nitrogen flow rate is 4L / min;

[0038] Perform tensile deformation on the material treated in step 3, the tensile speed is 2mm / s, the tensile amount is 15%, to avoid surface oxidation and contamination of the material during the tensile process, use argon gas to protect the surface of the material, the argon flow rate is 4L / min, indoor environment: temperature: 25℃, humidity: 50%;

[0039] Enhance the toughening effect of the material treated in step 4;

[0040] Put the material treated in step 3 into the furnace for heating. First, adjust the furnace temperature to 220℃ and keep it for 20 minutes to make the material temperature uniform to the target temperature. Then, keep the material for 4 hours to achieve the best toughening effect.

[0041] After the holding is finished, quickly take the material out of the furnace and rapidly cool it to fix the microstructure and properties of the material. Use water quenching for rapid cooling.

[0042] Put the material into the furnace again for heating treatment. First, adjust the furnace temperature to 140℃ and keep it for 30 minutes to make the material temperature uniform to the target temperature. Then, keep the material for 2 hours to achieve the best toughening effect.

[0043] After the holding is finished, quickly take the material out of the furnace and rapidly cool it using oil quenching to fix the microstructure and properties of the material.

[0044] Age the material treated in step 5 at a temperature of 130℃ for 8 hours.

[0045] Experimental data: After the above treatment process, the tensile strength of ZL205A aluminum alloy is 500MPa, the yield strength is 430MPa, and the elongation is 14%.

[0046] Example 3: A toughening treatment process for ZL205A aluminum alloy, including the following steps:

[0047] Select ZL205A aluminum alloy material and cut it into the required size. Then, perform surface treatment to remove surface oxides.

[0048] Put the material treated on the surface into the heating furnace with a heating rate of 50℃ / min until the material temperature reaches 450℃. Keep it for 2 hours to achieve uniform heating.

[0049] After the holding is finished, use inert gas to quickly cool the material to room temperature to avoid excessive grain growth and deformation.

[0050] Start the cooling equipment and control the cooling rate to be 30℃ / s. During the cooling process, continuously spray nitrogen gas onto the surface of the material to protect it from oxidation and contamination. The nitrogen flow rate is 2L / min.

[0051] Stretch the material treated in step 3 at a stretching speed of 0.5mm / s with a stretching amount of 10%. To avoid surface oxidation and contamination during stretching, use argon gas to protect the surface of the material. The argon flow rate is 2L / min. The indoor environment: temperature: 20℃, humidity: 30%.

[0052] enhancing the toughening effect of the material after step 4 processing;

[0053] After step 3 processing, the material is placed in a furnace for heating. First, the furnace temperature is adjusted to 180°C and maintained for 30 minutes to uniformly reach the target temperature, and then the material is kept for 2 hours;

[0054] After the end of the holding, the material is quickly taken out of the furnace and rapidly cooled to fix the microstructure and properties of the material, and water quenching is used for rapid cooling;

[0055] The material is again placed in the furnace for heating treatment. First, the furnace temperature is adjusted to 150°C and maintained for 20 minutes to uniformly reach the target temperature, and then the material is kept for 1 hour to achieve the best strengthening and toughening effect;

[0056] After the end of the holding, the material is quickly taken out of the furnace and rapidly cooled using oil quenching to fix the microstructure and properties of the material;

[0057] The material after step 5 processing is subjected to aging treatment, with a treatment temperature of 160°C and a treatment time of 12 hours.

[0058] Experimental data: After the above processing, the tensile strength of ZL205A aluminum alloy is 460 MPa, the yield strength is 400 MPa, and the elongation is 10%.

[0059] In summary:

[0060] After completing the artificial aging treatment of step 6, the material is subjected to multiple tensile tests, and the following experimental data are within the following ranges:

[0061] Tensile strength: 480 MPa-550 MPa;

[0062] Yield strength: 400 MPa-470 MPa;

[0063] Elongation: 8%-14%;

[0064] Microstructure analysis:

[0065] The optimized aluminum alloy material is subjected to microstructure analysis to observe the grain size, distribution and phase transformation, and the experimental results are as follows:

[0066] Grain size: 5μm-10μm;

[0067] The grain distribution is uniform, with no obvious grain boundary deviation;

[0068] There are a small amount of MgZn2 phase and Al2Cu phase in the structure.

[0069] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since various modifications can be made by those skilled in the art, without departing from the spirit and scope of the application, which are defined by the appended claims and their equivalents.

Claims

1. A process for the strengthening and toughening of ZL205A aluminum alloy, characterized in that, The method comprises the following steps: Step 1: Select ZL205A aluminum alloy material and cut it to the required size, then perform surface treatment to remove surface oxides; Step 2: Place the surface-treated material in a heating furnace, heat at a rate of 30-50°C / min until the material temperature reaches 450-480°C, and maintain for 2-4 hours to achieve uniform heating; Step 3: After the holding period ends, quickly cool the material to room temperature using inert gas to avoid excessive grain growth and deformation; Step 4: Perform tensile deformation on the material after Step 3; Step 5: Enhance the toughening effect of the material after Step 4; Step 6: Perform aging treatment on the material after Step 5; In Step 3, the specific operation steps are as follows: Step 3.1: After the holding period ends, use nitrogen to move the material to the cooling equipment, and control the temperature of the cooling equipment at 18-25°C; Step 3.2: Start the cooling equipment and control the cooling rate, which is selected according to the characteristics of the material and processing requirements, and a cooling rate of 30-50°C / s is adopted; Step 3.3: During the cooling process, continuously spray inert gas onto the surface of the material to protect it from oxidation and contamination, and the nitrogen flow should be between 2-5 L / min; In Step 4, the tensile parameters are as follows: tensile speed is 0.5-2 mm / s, and tensile amount is 10-25%; The specific operation steps in Step 5 are as follows: Step 5.1: Place the material after Step 4 in the furnace for heating, first adjust the furnace temperature to 180-220°C and maintain for 20-30 minutes to uniformly heat the material to the target temperature, then maintain the material for 2-4 hours; Step 5.2: After the holding period ends, quickly remove the material from the furnace and perform rapid cooling to fix the microstructure and properties of the material, and use water quenching for rapid cooling; Step 5.3: Place the material in the furnace again for heating treatment, first adjust the furnace temperature to 150-180°C and maintain for 20-30 minutes to uniformly heat the material to the target temperature, then maintain the material for 1-2 hours to achieve the best strengthening and toughening effect; Step 5.4: After the holding period ends, quickly remove the material from the furnace and perform rapid cooling using oil quenching to fix the microstructure and properties of the material; In Step 6, the aging treatment parameters are as follows: treatment temperature is 120-160°C, and treatment time is 8-12 hours.

2. The process for the strengthening and toughening treatment of ZL205A aluminum alloy according to claim 1, characterized in that: In Step 3, monitor the material temperature and surface state in real time, adjust the cooling rate and cooling method to ensure stable and reliable strengthening and toughening effect of the material.

3. The process for the strengthening and toughening treatment of ZL205A aluminum alloy according to claim 2, characterized in that: To avoid surface oxidation and contamination of the material during the tensile process, use inert gas to protect the surface of the material, inert gas flow: 2-5 L / min, indoor environment: temperature: 20-25°C, humidity: 30-50% RH.