|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Analysis of Al 6061 and Mild Steel Joints from Rotary Friction Welding
||Nikhil Gotawala, Amber Shrivastava
|On-Site Speaker (Planned)
This work focuses on the microstructure evolution upon rotary friction welding of Al 6061 to mild steel and resulting joint strength. Material deforms plastically during rotary friction welding, however, temperatures are low enough to prevent melting, which limits intermetallic compound formation. Displacement controlled rotary friction welding of circular workpieces is performed with combinations of three friction times (48 sec, 24 sec and 16 sec) and two rotation speeds (1200 rpm and 1400 rpm). Significant grain refinement is observed at the centre on Al 6061 side, which indicates dynamic recrystallization. However, only recovery is observed at the mild steel side, which is attributed to low temperatures. The maximum joint strength of 136 MPa is achieved. The fractured surfaces from tensile tests reveal sticking of Al 6061 on mild steel at the centre region. The fractured surfaces suggest ductile fracture in the centre region and brittle fracture close to the periphery.