7000 series aluminum alloy member excellent in stress corrosion cracking resistance and method for manufacturing the same

一种铝合金构件、耐应力腐蚀的技术，应用在耐应力腐蚀裂纹性优异的7000系铝合金构件及其制造领域，能够解决裂纹性降低、挤压材料强度降低、成形性提高等问题，达到改善耐应力腐蚀裂纹性、减少拉伸残余应力的效果
CN103966490AInactive Publication Date: 2014-08-06KOBE STEEL LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KOBE STEEL LTD
Publication Date
2014-08-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

An aluminum alloy member resistant to cracking and having high strengths and excellent stress corrosion cracking resistance is manufactured by expanding a 7000 series aluminum alloy hollow extrusion material at a rate of 5% or more. Specifically, a 7000 series aluminum alloy hollow extrusion material containing Zn of 3.0-9.5%, Mg of 0.4-2.5%, Cu of 0.05-2.0%, and Ti of 0.005-0.2%, in mass percent, and prepared through press quenching is subjected to a reversion treatment, to pipe expansion within 72 hours after the reversion treatment, and to temper aging. The reversion treatment includes heating at a temperature rise rate of 0.4 DEG C / second or more, holding in a temperature range of 200-550 DEG C for longer than 0 second, and cooling at a rate of 0.5 DEG C / second or more. The ratio Y ([sigma]rs / [sigma]0.2) of the tensile residual stress [sigma]rs to the 0.2% yield stress [sigma]0.2 after temper aging and the total content X of Mg and Zn satisfy Expression (1): Y<=-0.1X+1.4 (1).
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Description

technical field

[0001] The present invention relates to a 7000-series aluminum alloy member and a manufacturing method thereof, in which a high-strength 7000-series aluminum alloy extruded hollow section is expanded to form a member, and a method for manufacturing the same, particularly to a 7000-series aluminum alloy member excellent in stress corrosion cracking resistance and methods of manufacture thereof. Background technique

[0002] Patent Documents 1 and 2 describe pipe expansion of a 6000-series aluminum alloy hollow extruded material by electromagnetic forming, and Patent Documents 3 and 4 describe a 6000-series aluminum alloy having excellent pipe expandability by electromagnetic forming As the hollow extruded material, Patent Document 5 describes a 6000-series aluminum alloy hollow extruded material excellent in pipe expandability by hydroforming. The 6000-series aluminum alloy hollow extruded materials described in Patent Documents 1 to 5 are all pipe-expanded i...

Claims

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