Evaluation of stress–relieving heat treatment on mechanical properties and microstructure of friction-welded JIS S45C steel

This research evaluates the effect of stress-relieving Post-Weld Heat Treatment (PWHT) on the mechanical properties and microstructure of friction-welded JIS S45C steel joints.The PWHT was conducted at 500 C for 1 hour.Tensile and Vickers microhardness tests were performed on both as-welded and heat-treated specimens.The tensile tests showed that fracture consistently occurred in the base metal, confirming good weld quality.Stress-relieved specimens showed a 3% increase in elongation compared to the as-welded condition, indicating improved plasticity.The Vickers microhardness tests revealed around 10% decrease in hardness at the weld center zone (from 293 HV to 267 HV) and heat-affected zone (from 245 HV to 224 HV) after treatment.Metallographic observation indicated coarsening of the pearlite phase due to thermal exposure.