Retrogression Forming and Reaging of AA7075-T6 Alclad to Produce Stampings with Peak Strength
Retrogression Forming and Reaging of AA7075-T6 Alclad to Produce Stampings with Peak Strength
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AA7075-T6 Alclad 的回归成形和再时效可生产具有峰值强度的冲压件
DOI：
10.1007/978-3-030-36408-3_35
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Katherine E. Rader, Jon T.
中科院分区：
文献类型：
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作者：
Katherine E. Rader, Jon T.
以AA7075-T6铝合金薄板为材料，采用回火热处理和同步热成形相结合的工艺，生产出十字形冲压件。这个过程称为回退形成。通过计算预测了在成形后通过单次时效热处理达到峰值时效强度的最大允许倒退成形时间，包括板料加热、转移和冲压。在200℃下，在2 s内将1.6 mm厚的AA7075-T6 Alclad片材冲压至45 mm深度而不发生劈裂。形成的几何形状显示出适合汽车结构部件的复杂性。然后对这些冲压件进行两种热处理中的一种。120°C 24小时的完全时效热处理产生的强度水平超过了原始的峰值时效T6合金板材。在185°C下进行25分钟的模拟烤漆热处理，恢复了95%的热成型强度损失。AA7075-T6的成功回退成形和时效为在不牺牲强度的情况下将高强度铝合金冲压成复杂几何形状提供了新的可能性。
A retrogression heat treatment was combined with simultaneous warm forming to produce cross-shaped stampings from AA7075-T6 Alclad sheet. This process is termed retrogression forming. A maximum-allowed-retrogression-forming-time, which includes sheet heat up, transfer, and stamping, was predicted by calculation to achieve peak-aged strength through a single reaging heat treatment after forming. Sheets of 1.6-mm-thick AA7075-T6 Alclad were stamped at 200 °C to a depth of 45 mm within 2 s without splitting. The formed geometry exhibits a complexity appropriate to automotive structural components. These stampings were then subjected to one of two reaging heat treatments. A full reaging heat treatment of 120 °C for 24 h produced strength levels in excess of the original, peak-aged T6 alloy sheet. A simulated paint bake heat treatment at 185 °C for 25 min recovered 95% of the strength lost during warm forming. Successful retrogression forming and reaging of AA7075-T6 provides new possibilities for stamping high-strength aluminum alloys into complex geometries without sacrificing strength.
6xxx铝合金温成形与冷成形的拉深性能比较
DOI：
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发表时间：
2018
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
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作者：
Hyunok Kim;R. Hahnlen;T. Feister;V. Tunga
通讯作者：
V. Tunga
铝合金的应力腐蚀开裂（SCC）
DOI：
10.1533/9780857093769.3.307
发表时间：
2011
期刊：
Materials Science and Engineering
影响因子：
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作者：
M. Kannan;P. B. Srinivasan;V. S. Raja
通讯作者：
V. S. Raja
AA7075淬火速率的实验评价
DOI：
10.4271/2014-01-0984
发表时间：
2014
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
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作者：
A. Keci;N. R. Harrison;S. Luckey
通讯作者：
S. Luckey