Abstract
This paper studied the effect of laser surface hardening on fatigue crack growth rate in AISE-4130 steel. The influences of microstructure, residual stresses and hardening depth on fatigue crack growth rate were considered. A comparison of radiated and unradiated specimens showed that the laser-hardened layer contained high strength structure and residual compressive stresses which would retard the crack growth rate near the early stage of fatigue crack propagation. This retarded effect increased when hardened depth increased and this effect would disappear as ΔK value increased. The Fracture mechanism of the hardening layer is intergranular cleavage fracture, and in the base material transgranular ductile Fracture.
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