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A kind of heat treatment method of al-zn-mg-cu aluminum alloy
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A heat treatment method and aluminum alloy technology, applied in the field of heat treatment of Al-Zn-Mg-Cu aluminum alloy, can solve the problems of aluminum alloy fatigue performance, poor corrosion resistance, poor mechanical properties of aluminum alloy, poor corrosion resistance, etc., to achieve Improved processing accuracy, improved fatigue performance, and easy operation
Active Publication Date: 2019-08-30
CENT SOUTH UNIV
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This process improves the comprehensive mechanical properties of the alloy, improves the corrosion resistance, and expands the application range of high-strength aluminum alloys. However, the three-stage aging treatment step of the invention is continuous, and the rough processing step is not included in the middle, so the aluminum alloy forging remains The stress and quenching residual stress cannot be fully released in time, resulting in poor fatigue performance and corrosion resistance of the final aluminum alloy. In addition, the mechanical properties of the aluminum alloy are also poor, and the production cycle is also long
[0007] The Australian CSIOR company has developed heat treatment technologies such as T6I6 and T6I4. Among them, the T6I6 treatment process includes three stages: first, the alloy is pre-aged at T6 temperature for a short time (generally 120 °C pre-aging for 80 minutes), so that the alloy is in an under-aged state. Secondary aging at lower temperature for a long time (generally at 60°C, 15d), and finally aging at T6 temperature (120°C, 18h), but the conductivity of the treated aluminum alloy is only about 31IACS%, and the corrosion resistance is very poor
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Embodiment 1
[0033] Sample a is an Al-Zn-Mg-Cu aluminum alloy forging with a maximum cross-sectional thickness of 100 mm. Forgings, see figure 1 .
[0034] Use 477°C air furnace for solid solution for 180min and then water quenching; the first aging temperature is 125°C, and the aging time is 0.5h; rough machining is carried out after water cooling, and the surface machining allowance is 0.7; followed by the second aging, the aging temperature is 55 ℃, the aging time is 240h; finally, the third aging is carried out, the aging temperature is 150℃, and the aging time is 36h; after cooling at room temperature, finish machining.
[0035] The above-mentioned forgings are tested, and the test method is as follows:
[0036] Mechanical performance test: standard tensile specimens were made according to GB / T 228-2002, and the tensile test was carried out on a CSS-44100 universal material mechanics tensile machine with a tensile speed of 2mm / min to obtain the tensile strength (σ b ), yield strengt...
Embodiment 2
[0042] Sample b is an Al-Zn-Mg-Cu aluminum alloy forging with a maximum cross-sectional thickness of 50 mm. Forgings, see figure 2 .
[0043] Use 477°C air furnace for solid solution for 120 minutes and then water quenching; the first aging temperature is 125°C, and the aging time is 0.5h; after water cooling, rough machining is carried out, and the surface machining allowance is 0.5; then the second aging is carried out, and the aging temperature is 50 ℃, the aging time is 192h; finally, the third aging is carried out, the aging temperature is 150℃, and the aging time is 36h; after cooling at room temperature, finish machining.
[0044] The test method of sample b is the same as in Example 1, and the test results are shown in Table 1.
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Abstract
The invention discloses a heat treatment method for an Al-Zn-Mg-Cu aluminum alloy. A solid solution-quenching-multistage aging system is adopted. The method includes the following steps that firstly,solid solution and quenching are performed, wherein a forged piece of the Al-Zn-Mg-Cu aluminum alloy is subjected to solid solution and quenching treatment, and the solid solution temperature is 470-478 DEG C; secondly, the first time of aging is performed, wherein the temperature of the first time of aging is 125 DEG C, and heat preserving time is 30-180 min; thirdly, rough machining is performed, wherein the forged piece after the first time of aging is subjected to water cooling, and then rough machining is performed; fourthly the second time of aging is performed, wherein the temperature of the second time of aging is 50-55 DEG C, and heat preserving time is 7-30 days; and fifthly, the third time of aging is performed, wherein the temperature of the third time of aging is 135-165 DEG C, and heat preserving time is 6-45 h. According to the heat treatment method for the Al-Zn-Mg-Cu aluminum alloy, strength is still kept at high level while the fatigue performance and the corrosion resistance of the aluminum alloy are improved.
Description
technical field [0001] The invention belongs to the field of nonferrous metal materials and thermal processing thereof, and in particular relates to a heat treatment method of Al-Zn-Mg-Cu aluminum alloy. Background technique [0002] Al-Zn-Mg-Cu alloy metal aging can strengthen the aluminum alloy, which has many advantages such as low density, high strength and good corrosion resistance. It is widely used in aerospace, marine and rail transportation and other fields, especially for shafts. , rings, supports and other load-bearing components, these components have high requirements for toughness, corrosion resistance and fatigue resistance. [0003] This series of alloys often adopts multi-stage heat treatment to obtain the above comprehensive performance requirements. Some double-stage aging systems, such as T74 and T76, can obtain good toughness and corrosion resistance, but the strength drops seriously. Regression and aging treatment can obtain good comprehensive performa...
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