Heat treatment process for machining A356 aluminum alloy and improving ductility
Through improved heat treatment processes, including solid solution and hot water cooling, the elongation of A356 aluminum alloy is improved, the problem of insufficient elongation in the prior art is solved, the demand for high plastic application scenarios is achieved, and sufficient tensile strength is maintained.
Patent Information
- Application Number
- CN202510111076.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-09
AI Technical Summary
The elongation of A356 aluminum alloy is usually less than 8%, which cannot meet the needs of high plastic application scenarios. In particular, the national standard elongation of thermal processing technology is 4%, which cannot meet the needs of customers.
An improved heat treatment process is adopted, including physical and chemical analysis of workpieces, cleaning and proportional analysis, test piece casting, solid solution test, hot water cooling, artificial aging test, air cooling, cutting processing, grinding and physical performance detection. This process is controlled by the solution temperature at (530±2)℃, the solution time is 6 hours, the hot water cooling time is 8 minutes, and artificial aging test is carried out to improve the elongation of the workpiece.
Through this heat treatment process, the elongation of the workpiece is significantly increased to ≥8%, while maintaining sufficient tensile strength, improving the plasticity and damage and fracture resistance of the product, and meeting the needs of high plastic application scenarios.
Smart Images
Figure CN119956259A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of processing and relates to a heat treatment process for processing A356 aluminum alloy to improve elongation. Background Art
[0002] The main components of A356 aluminum alloy include silicon (Si) 6.5-7.5%, magnesium (Mg) 0.20-0.40%, iron (Fe) less than or equal to 0.20%, copper (Cu) less than or equal to 0.20%, manganese (Mn) less than or equal to 0.10%, zinc (Zn) less than or equal to 0.10%, titanium (Ti) less than or equal to 0.20%, and the rest is aluminum (Al). It is generally processed by metal mold casting or liquid extrusion casting or hot working treatment process, but in actual use, the above processing methods will affect the elongation of A356, and its elongation is generally less than 8%. The elongation affects the plastic deformation ability of the material under stress conditions, which is particularly important for the application scenarios of materials with high plasticity. Especially for hot working treatment process, its application is relatively wide, but its national standard elongation is 4%, which cannot meet the customer's use needs. Summary of the invention
[0003] The purpose of the present invention is to provide a heat treatment process for improving elongation in view of the above problems existing in the prior art.
[0004] The object of the present invention can be achieved by the following technical scheme: A heat treatment process for processing A356 aluminum alloy to improve elongation, characterized in that it includes the following steps: Inspection: Physical and chemical analysis of workpieces; Solvent: Clean the workpiece and perform proportion analysis (A356: Si: 6.5-7.5 Mg: 0.25-0.45 Cu≤0.2 Mn≤0.1 Fe≤0.2 Ti≤0.2 Zn≤0.1 Sr0.02-0.05 Al: balance); Test piece casting: Cut the workpiece along the sawing line, and after polishing and cleaning with 240# sandpaper, within the range of 30mm×30mm, the pores should be ≤0.5mm and not more than 2, the pores should be ≤0.3mm and not more than 4, and there should be no defects such as bird's nests larger than 10mm; Solution test: the solution temperature is maintained at (530±2)℃, and the solution time is 6 hours; Hot water cooling: The hot water temperature is maintained at (60-70)°C, and the cooling time is 8 minutes; Artificial aging test: Heat the workpiece after solution treatment to (170-175)°C and keep it for 6 hours; Air cooling: cool the workpiece to room temperature; Cutting: Processing the workpiece to the specified size; Grinding: finishing the workpiece after cutting; Physical property testing: testing the hardness, tensile strength and elongation of the workpiece.
[0005] Compared with the prior art, the heat treatment process for processing A356 aluminum alloy to improve elongation improves the elongation of the product by improving the heat treatment process. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 This is a flow chart of the heat treatment process used to process A356 aluminum alloy to improve elongation. DETAILED DESCRIPTION
[0007] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0008] like Figure 1 As shown, the heat treatment process for processing A356 aluminum alloy to improve elongation is characterized by comprising the following steps: Inspection: Physical and chemical analysis of workpieces; Melting material: cleaning and proportion analysis of the workpiece (A356: Si:6.5-7.5 Mg:0.25-0.45 Cu≤0.2 Mn≤0.1 Fe≤0.2 Ti≤0.2 Zn≤0.1 Sr0.02-0.05 Al: balance) is carried out in the melting furnace; Test piece casting: Cut the workpiece according to the sawing line, and after cleaning with 240# sandpaper, within the range of 30mm×30mm, the pores should be ≤0.5mm and not more than 2, the pores should be ≤0.3mm and not more than 4, and there should be no defects such as bird's nests larger than 10mm, and it should be carried out in the melting furnace; Solution test: The solution temperature is maintained at (530±2)℃, and the solution time is 6 hours in a muffle furnace; Hot water cooling: The hot water temperature is maintained at (60-70)°C, and the cooling time is 8 minutes; Artificial aging test: Heat the workpiece after solution treatment to (170-175)°C and keep it for 6 hours in an aging box; Air cooling: cool the workpiece to room temperature; Cutting: Processing the workpiece to the specified size; Grinding: finishing the workpiece after cutting; Physical property testing: Test the hardness, tensile strength and elongation of the workpiece using a Rockwell hardness tester and a tension and compression testing machine. The sample hardness is HRB46, 48, 46.5, 46, 50; the tensile strength is 283, 282, 299, 295, 298; and the elongation is 13.8%, 11%, 8.8%, 13.6%, 17%.
[0009] The workpiece inspection after this heat treatment process is as follows: hardness HRB30-50, tensile strength: Rm≥235MPa, elongation ≥8%. Compared with the original heat treatment process, hardness ≥80HB, tensile strength: Rm≥235MPa, elongation ≥5%, the elongation is improved while taking into account the tensile strength, so that the plasticity of the product is enhanced under the condition of maintaining sufficient strength, and the product's ability to resist damage and fracture is improved.
[0010] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
[0011] Although the term "such as" is used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.
Claims
1. A heat treatment process for processing A356 aluminum alloy to improve elongation, characterized in that: The following steps are involved: Inspection: Physical and chemical analysis of workpieces; Solvent: Clean the workpiece and perform proportion analysis (A356: Si: 6.5-7.5 Mg: 0.25-0.45 Cu≤0.2 Mn≤0.1 Fe≤0.2 Ti≤0.2 Zn≤0.1 Sr0.02-0.05 Al: balance); Test piece casting: Cut the workpiece along the sawing line, and after polishing and cleaning with 240# sandpaper, within the range of 30mm×30mm, the pores should be ≤0.5mm and not more than 2, the pores should be ≤0.3mm and not more than 4, and there should be no defects such as bird's nests larger than 10mm; Solution test: the solution temperature is maintained at (530±2)℃, and the solution time is 6 hours; Hot water cooling: The hot water temperature is maintained at (60-70)°C, and the cooling time is 8 minutes; Artificial aging test: Heat the workpiece after solution treatment to (170-175)°C and keep it for 6 hours; Air cooling: cool the workpiece to room temperature; Cutting: Processing the workpiece to the specified size; Grinding: finishing the workpiece after cutting; Physical property testing: testing the hardness, tensile strength and elongation of the workpiece.