This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Local Thermomechanical Processing for Improving Formability of High Strength Aluminum Sheets
Technical Paper
2022-01-0244
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Limited room temperature formability hinders the wide-spread use of high strength aluminum alloys in body parts. Forming at warm temperatures or from softer tempers are the current solutions. In this work, our approach is to start with age-hardened sheets from 7xxx and 6xxx family of alloys and improve their formability using local thermomechanical processing only in the regions demanding highest ductility in the forming processes. We achieved local formability improvements with friction stir processing and introduce another process named roller bending-unbending as a concept and showed its feasibility through finite element simulations. Initial results from FSP indicated significant deformation in the processed zones with minimal sheet distortion. FSP also resulted in dynamically recrystallized, fine grained (d < 5 μm) microstructures in the processed regions with textures significantly different from the base material. This resulted in formability improvements of > 30% in 7085-T76 and > 50% in 6111-T6 alloys as measured by minimum bend radius (r/t) ratios established with V-bending tests performed at 90° and 180° bend angles.
Authors
- Wahaz Nasim - Pacific Northwest National Laboratory
- Hrishikesh Das - Pacific Northwest National Laboratory
- Shank Kulkarni - Pacific Northwest National Laboratory
- Aashish Rohatgi - Pacific Northwest National Laboratory
- Darrell Herling - LightMAT
- Glenn Grant - Pacific Northwest National Laboratory
- Piyush Upadhyay - Pacific Northwest National Laboratory
- Mert Efe - Pacific Northwest National Laboratory
Topic
Citation
Nasim, W., Das, H., Kulkarni, S., Rohatgi, A. et al., "Local Thermomechanical Processing for Improving Formability of High Strength Aluminum Sheets," SAE Technical Paper 2022-01-0244, 2022, https://doi.org/10.4271/2022-01-0244.Also In
References
- Espinosa , R.H. , Das , S. , and Weaver , J. Simulation of Warm Forming Assisted Hemming to Study the Effect of Process Parameters on Product Quality SAE Technical Paper 2007
- Friedman , P.A. and Luckey , S.G. Failure of Al-Mg-Si Alloys in Bending Practical Failure Analysis 2 1 2002 33 42
- Gu , Z. , Wang , G. , and Yu , G. Investigation on Fracture of a 6014-T4 Aluminum Alloy Sheet in the Flanging and Hemming Process Based on Numerical and Experimental Methods Metals 10 1 2020 81
- Kleeh , T. , Merklein , M. , and Roll , K. Laser Heat Treatment Effects on Roller Hemming in Aluminum Alloys Key Engineering Materials 504-506 2012 711 716
- Carsley , J.E. et al. Roller Hemming Apparatus and Method US 2005
- Ma , Z.Y. Friction Stir Processing Technology: A Review Metallurgical and Materials Transactions A 39 3 2008 642 658
- Su , J.-Q. , Nelson , T.W. , and Sterling , C.J. Friction Stir Processing of Large-Aarea Bulk UFG Aluminum Alloys Scripta Materialia 52 2 2005 135 140
- Hirata , T. , Oguri , T. , Hagino , H. , and Tanaka , T. Influence of Friction Stir Welding Parameters on Grain Size and Formability in 5083 Aluminum Alloy Materials Science and Engineering: A 456 1 2007 344 349
- Miles , M.P. , Decker , B.J. , and Nelson , T.W. Formability and Strength of Friction-Stir-Welded Aluminum Sheets: Physical Metallurgical and Materials Science Metallurgical and Materials Transactions 35A 11 2004 3461 3468
- Mishra , R.S. , Mahoney , M.W. , McFaden , S.X. , Mara , N.A. et al. High Strain Rate Superplasticity in a Friction Stir Processed 7075 Al Alloy Scripta Materialia 42 2 1999 163 168
- Hulbert , D. , Fuller , C. , Mahoney , M. , and London , B. The Mechanical and Thick Section Bending Behavior of Friction Stir Processed Aluminum Plate Scripta Materialia 57 3 2007 269 272