|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Defects and Properties of Cast Metals IV
|Formation Mechanisms of Surface Blistering in AA6xxx Rolled Products: Microstructure Characterization, Ultrasonic Analysis, and Rolling Tests
|Pascal Gauthier, Mousa Javidani, Tao Wang, John Evans
|On-Site Speaker (Planned)
The evolution mechanisms of a non-hydrogen related blister defect on the 6xxx rolled aluminum sheets were investigated in this paper. It is revealed that aluminum sheet could still be susceptible to blistering even when the as-cast ingot has minimum residual hydrogen contents and presents no sign of any foreign materials or large inclusion populations. In those cases, all the blisters were aligned in the rolling direction and small aluminum oxide particles and films were found near to the defective areas. These observations suggest the blister defects originated from the as-cast ingot material surfaces. Hot and cold rolling simulation tests conducted using laboratory scale rolling machines demonstrated the defect evolvement from the ingot short face imperfection into blisters on the sheet products. In this study, a variety of rolling conditions were also tested for their effects on subsurface delamination prevention.
|Aluminum, Characterization, Solidification