A beam of Mo ions with an accelerating voltage of 50kV and a dose of 2×10 17 ions/cm 2 has been implanted in the Austenitic stainless steel with 1150℃ solution heat treatment. The cross-section substructures of the implanted samples were studied with the weak beam technique of the transmission electron microscopy. It was found that depth of the radiation damage was far greater than the ion range

and the substructure was the complex dislocation configuration similar to the effect of the work hardening. The reason of the so-called “long-range effect” of the work hardening in the ion-implanted materials affected by the radiation damages has been discussed.