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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Formability and Spring-back Issues in Ultra-high Strength Steels and High Strength Aluminum Alloys
Presentation Title Retrogression Forming and Reaging for Forming and Joining AA7075-T6 Sheet
Author(s) Eric M. Taleff, Danny Nikolai
On-Site Speaker (Planned) Eric M. Taleff
Abstract Scope Retrogression forming was used to stamp a complex part shape from AA7075-T6 Alclad sheet at 200C with only modest strength loss (8% or less), which was fully recovered through a single reaging heat treatment at 120C after forming. Together, these steps comprise the retrogression forming and reaging (RFRA) process. Increased ductility at 200C is the result of increased tearing resistance. This is accompanied by a decrease in flow stress by about one third and rapid stress relaxation, which can reduce residual stress by 15 to 40%. Both these effects should reduce spring back. The RFRA approach was then applied to join AA7075-T6 sheets by self pierce riveting. RFRA for forming and joining may enable production of AA7075-T6 components with a yield strength in the neighborhood of 500 MPa. This work was supported by the U.S. National Science Foundation under grant CMMI-1634495.
Proceedings Inclusion? Planned:
Keywords Aluminum, Shaping and Forming, Joining

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Investigation of the Bendability of Friction-stir Processed Aluminum 7075 & 6111 Alloys and Its Effect on Formability
Anisotropic Fracture of Mild and Advanced High Strength Steel in Non-linear Strain Paths
Dimensional Control in Flexible Fabrication of Sheet Metals for Automotive Applications
Hot Stamping of Third Generation Advanced High Strength Steels
Hybrid Bead Development and Validation; Auto Steel Partnership
Influence of Yoshida-Uemori Model on Springback Prediction
Microstructure and Mechanical Properties According to Heat Treatment of High Tensile Strength Steel Alloy
On Local Formability of Multi-phase Ultra-high-strength Steels
Retrogression Forming and Reaging for Forming and Joining AA7075-T6 Sheet
Roller Bending/Unbending Process for Improving the Local Mechanical Properties of Aluminum Sheets
The “Next Era in Stamping Technology” (NEST), The Fundamentals of a Hybrid Stamping Technology

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