Heat treatment method for vacuum high-pressure die-cast aluminum alloy casting

A heat treatment method and technology for aluminum alloys, applied in the field of heat treatment of high pressure die casting aluminum alloy die castings, can solve problems such as excessive residual level and no heat treatment allowed

Inactive Publication Date: 2016-01-06
ZHONGBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, however, the pore structure and residual levels of gas in die castings are still too high to allow heat treatment

Method used

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  • Heat treatment method for vacuum high-pressure die-cast aluminum alloy casting
  • Heat treatment method for vacuum high-pressure die-cast aluminum alloy casting
  • Heat treatment method for vacuum high-pressure die-cast aluminum alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A high-performance aluminum alloy vacuum die-casting heat treatment process, comprising the following steps:

[0025] (1) The aluminum alloy high-pressure die casting is first raised to 465°C for solution treatment at a rate of 5°C / min for 60 minutes, then continues to rise to 495°C for solution treatment for 10 minutes, and then immediately put it into water (room temperature) for quenching;

[0026] (2) Place the quenched aluminum alloy high pressure die casting at room temperature for 9 hours;

[0027] (3) Then put the aluminum alloy high-pressure die casting into liquid nitrogen for cryogenic treatment for 12 hours, and the temperature of liquid nitrogen is -197°C;

[0028] (4) Aging the cryogenically treated aluminum alloy vacuum die-casting parts in an aging furnace with an aging temperature of 200°C and an aging time of 4 hours;

[0029] (5) Air cooling after aging;

[0030] (6) The microhardness of the casting matrix is ​​tested, which is 56% higher than that ...

Embodiment 2

[0032] A high-performance aluminum alloy vacuum die-casting heat treatment process, comprising the following steps:

[0033] (1) Heat the aluminum alloy high-pressure die casting to 470°C for 50 minutes at a rate of 8°C / min for solution treatment, then continue to rise to 490°C for 10 minutes and immediately put it into water (room temperature) for quenching;

[0034] (2) Place the quenched aluminum alloy high pressure die casting at room temperature for 10 hours;

[0035] (3) Then put the aluminum alloy high-pressure die casting into liquid nitrogen for cryogenic treatment for 14 hours, and the temperature of liquid nitrogen is -197°C;

[0036] (4) Aging the cryogenically treated aluminum alloy vacuum die-casting parts in an aging furnace with an aging temperature of 180°C and an aging time of 5 hours;

[0037] (5) Air cooling after aging;

[0038] (6) The microhardness of the casting matrix is ​​tested, which is 62% higher than that of the unheated matrix (the average valu...

Embodiment 3

[0040] A high-performance aluminum alloy vacuum die-casting heat treatment process, comprising the following steps:

[0041] (1) Heat the aluminum alloy high-pressure die casting to 475°C for 30 minutes at a rate of 4°C / min, then continue to rise to 485°C for 15 minutes, and then put it into water (room temperature) for quenching;

[0042] (2) Place the quenched aluminum alloy high pressure die casting at room temperature for 6 hours;

[0043] (3) Then put the aluminum alloy high-pressure die casting into liquid nitrogen for cryogenic treatment for 16 hours;

[0044] (4) Aging the cryogenically treated aluminum alloy vacuum die-casting parts in an aging furnace with an aging temperature of 170°C and an aging time of 6 hours;

[0045] (5) Air cooling after aging;

[0046](6) The microhardness of the casting matrix is ​​tested, which is 58% higher than that of the unheated matrix (the average value of 5 test points), and it is also significantly improved compared with ordinary...

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Abstract

The invention provides a heat treatment method for a vacuum high-pressure die-cast aluminum alloy casting. According to the heat treatment method, gradient temperature rising type high-temperature transient solution treatment conducted on the high-pressure die-cast aluminum alloy casting is achieved, then liquid-nitrogen subzero treatment is conducted, and thus the later aging treatment effect is improved. During operation, a gradient temperature rising process is adopted so that dissolving can be conducted on a low-melting-point phase at a relative low temperature firstly, eutectic silicon in the alloy is fully granulated after the temperature is increased again, and in this way, the situation that cracks appear in the structure and the performance is reduced due to overburning is avoided; subzero treatment is adopted firstly after solution treatment and quenching and before manual aging treatment so that the casting can contract to generate great contraction stress, a large amount of dislocation is introduced into the structure, a large number of nucleation mass points are provided for second-phase dispersed precipitation during aging, and aging strengthening is enhanced.

Description

technical field [0001] The invention relates to a heat treatment method suitable for vacuum high-pressure die-casting Al-Si-Cu-Mg alloy castings, belonging to the field of heat treatment of high-pressure die-casting aluminum alloy die-castings. Background technique [0002] With the development of the global economy, energy consumption has increased significantly, and environmental pollution has become increasingly serious. The requirements for energy saving and consumption reduction of modern automobiles are constantly rising, safety and environmental protection regulations are becoming stricter, and the requirements for automobile lightweight are more urgent. With its high specific strength, good corrosion resistance, formability and corrosion resistance, and high recovery rate, aluminum alloy has great significance in reducing vehicle weight, reducing fuel consumption, reducing environmental pollution and improving operational performance. It has become the material of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 张文达刘云李传大夏原高方圆李刚
Owner ZHONGBEI UNIV
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