About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
Retrogression Forming and Reaging of AA7075-T6 Alclad to Produce Stampings with Peak Strength |
Author(s) |
Katherine Rader, Louis G. Hector, Jon T. Carter, Eric M. Taleff |
On-Site Speaker (Planned) |
Katherine Rader |
Abstract Scope |
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 defined 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 seconds 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 hours produced strength levels in excess of the original, peak-aged T6 alloy sheet. A simulated paint bake heat treatment at 185°C for 25 minutes recovered 95% of the strength lost during warm forming. |
Proceedings Inclusion? |
Planned: Light Metals |