Increasing the design strength of steels by laser hardening

Endurance limit of pulsed laser hardened component-like specimens—Experiment and simulation

“…If during laser hardening melting occurred, the endurance limit was reduced [25]. A laser hardening of cylindrical specimens with helical, overlapping hardened traces was beneficial for the endurance limit [26][27][28][29]. Cerny et al found that a single circumferential hardened trace or three circumferential traces in a distance of 3 mm at a cylindrical specimen decreased the endurance limit [30].…”