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Heat treatment method applicable to low-pressure cast A356.2 alloy hubs

A technology of low-pressure casting hubs and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as difficulty in meeting the use requirements, low alloy strength, coarse precipitates and uneven distribution of chemical components, etc., and achieve strength Improvement, Microstructure Improvement, Tensile Strength and Yield Strength Improvement Effect

Active Publication Date: 2020-04-03
DARE WHEEL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the solidification process of low-pressure casting, there are dendrite segregation, coarse precipitates and uneven distribution of chemical components in the grain boundaries and inside the grains. The solid solution and aging treatment in the existing heat treatment process cannot completely eliminate and improve these phenomena. Phenomenon, often lead to alloy strength is not high, difficult to meet the use requirements

Method used

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  • Heat treatment method applicable to low-pressure cast A356.2 alloy hubs
  • Heat treatment method applicable to low-pressure cast A356.2 alloy hubs
  • Heat treatment method applicable to low-pressure cast A356.2 alloy hubs

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Effect test

Embodiment 1

[0022] The heat treatment method of A356.2 aluminum alloy for low-pressure casting hubs is: homogenization treatment at 445°C for 13 hours, after homogenization, take out the furnace and cool to room temperature in the air, and then carry out solid solution treatment. The solid solution temperature is 545°C, and the solid solution The time is 6 hours, quenching treatment is carried out immediately after solid solution, the quenching method is water quenching, the water temperature is 70-90°C, the quenching transfer time does not exceed 30 seconds, and aging treatment is carried out after quenching, the aging temperature is 145°C, and the aging time is 5 Hour.

[0023] For the mechanical performance test, see Scheme A in Table 1.

Embodiment 2

[0025] The heat treatment method of A356.2 aluminum alloy for low-pressure casting hubs is: homogenization treatment at 450°C for 12 hours, after homogenization, take out the furnace and cool to room temperature in the air, and then carry out solid solution treatment. The solid solution temperature is 550°C. The time is 5 hours, quenching treatment is carried out immediately after solid solution, the quenching method is water quenching, the water temperature is 70-90°C, the quenching transfer time does not exceed 30 seconds, and aging treatment is carried out after quenching, the aging temperature is 150°C, and the aging time is 4.5 Hour.

[0026] For the mechanical performance test, see Scheme B in Table 1.

Embodiment 3

[0028] The heat treatment method of A356.2 aluminum alloy for low-pressure casting hubs is: homogenization treatment at 455°C for 11 hours, after homogenization, take out the furnace and cool to room temperature in the air, and then carry out solid solution treatment. The solid solution temperature is 540°C. The time is 5.5 hours, quenching treatment is carried out immediately after solid solution, the quenching method is water quenching, the water temperature is 70-90°C, the quenching transfer time is not more than 30 seconds, and aging treatment is carried out after quenching, the aging temperature is 155°C, and the aging time is 4 Hour.

[0029] For the mechanical performance test, see Scheme C in Table 1.

[0030] After the rim sample on the as-cast wheel hub is subjected to the heat treatment described in the embodiment, the mechanical performance test is carried out. The mechanical performance test results of the alloy sample and the mechanical performance data of the or...

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Abstract

The invention belongs to the technical field of heat treatment of non-ferrous metals, relates to a heat treatment method, in particular to a heat treatment method applicable to low-pressure cast A356.2 alloy hubs. The heat treatment method comprises the following steps: carrying out homogenization treatment on the low-pressure cast hubs at homogenization temperature of 440-460 DEG C for 11-13 h, then, performing solution treatment at solution temperature of 540-550 DEG C for 4-5 h after homogenization, then, immediately carrying out quenching treatment at quenching water temperature of 70-90 DEG C with quenching transfer time not exceeding 25 s, and immediately performing aging treatment at aging temperature of 145-155 DEG C for 4-5 h after quenching. The heat treatment method greatly improves the comprehensive mechanical properties of the low-pressure cast hubs, the tensile strength and yield strength are substantially improved, the elongation after break is remarkably improved, microstructures are obviously improved, all mechanical performance indexes meet technical requirements, so that the low-pressure cast A356.2 alloy hubs are more applicable to manufacturing requirements ofhigh-quality exported limousine and large truck hubs.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of nonferrous metals, and relates to a heat treatment method, in particular to a heat treatment method suitable for an A356.2 alloy low-pressure casting wheel hub. Background technique [0002] Automobile lightweight technology has promoted the continuous development of the automobile industry. Studies have shown that every 10% weight loss of a car can save 3% to 7% of fuel consumption, greatly improving the fuel economy of the car, and reducing the emissions of carbon dioxide and PM2.5 during the service life of the car. Both pollution and smog control play a very important role. As an important part of the car, the aluminum alloy wheel hub is of great significance to its weight reduction and the weight reduction of the car. The main manufacturing methods of aluminum alloy wheels are: casting method, forging method, stamping method, spinning method, semi-solid die forging method, etc. A...

Claims

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Application Information

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IPC IPC(8): C22F1/04C21D9/34
CPCC21D9/34C22F1/002C22F1/04
Inventor 何芳何国元张伟斌裔国宇庄林忠李宏祥吴长旻
Owner DARE WHEEL MFG