Failure mechanism of laser clad Ni-2 coating under fluctuating impact load

Austenitic stainless steel treated with laser clad Ni-based alloy is tested under impact load.There is micro plastic deformation in the base and clad coating.Macro plastic deformation is formed after repeated process,and homogeneous hardening comes into being from clad to base.There is intensive deformation hardening and material-flowing phenomena along the brink of clad coating,on which cracks tend to grow and spread.