High Temperature Heavy-Working Phenomenon of the Friction Welds of Carbon Steel S55C

Abstract

During friction welding, joint interface should be heavy worked at high temperature. So, controlled hot torsion test wars carried out to study the deformation resistance and induced microstructures during this high temperature heavy-working. And these results were compared with friction torque and microstructures of friction welded joint.
Main results were as follows;
(1) Deformation resistance during high temperature heavy-working and induced microstructure depend on strain rate and temperature.
(2) The power relation between steady state torque or austenite grain size and Zener-Hollomon parameter was obtained.
(3) Austenite grain size of weld interface can be estimated from the friction torque by using the result of hot torsion test.