Abstract
In a previous paper, we have shown that noble gas ion implantation to austenitic stainless steels has induced γ→α (martensitic) transformation, and we have discussed a mechanism for this phase transformation. In the present paper, phase transformations in austenitic stainless steels implanted with metal ion have been investigated by conversion electron Mössbauer spectroscopy (CEMS) and X-ray diffraction. Observation by CEMS and X-ray diffraction, showed clearly that different metal ion species make different contributions to ion-induced γ→α transformation. It was confirmed that γ→α transformation in 17/7 steels implanted with Fe ion and Ni ion occured by both the effect of compositional change (the alloying effect) and that of damage-induced stress (the stress effect). In case of Snion-implanted 17/7 steel, on the other hand, it seems that only the stress effect is a driving force for γ→α transformation.
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