SEDL / STP / STP955-EB / STP33821S

Dislocation Behavior in the Swelling Process of HVEM Irradiated Stainless Steel

Igata, N
Professor, research associate, and graduate student, The University of Tokyo, Tokyo,

Kohno, Y
Professor, research associate, and graduate student, The University of Tokyo, Tokyo,

Nishimura, J
Professor, research associate, and graduate student, The University of Tokyo, Tokyo,

Pages: 8    Published: Jan 1987

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Abstract

The objective of this study is to clarify the role of dislocations in the swelling process of high-voltage electron microscopy (HVEM) irradiated stainless steel. Solution annealed 304 stainless steels were irradiated and observed in-situ by means of HVEM in the temperature range of 673 to 873K. Swelling results were interpreted using the after-transient linear swelling model in all irradiations. Change of dislocation density was measured as a function of irradiation dose, and the dose for dislocation density saturation was found to correspond to the dose when swelling began to increase linearly in almost all cases. The saturated void number density was proved to be closely equal to the number density of dislocation loops formed in the early stage of irradiation, and in some cases, positional correspondence between them was also found. These phenomena suggest the possibility of void nucleation at initial dislocation loop sites.