トリチウムオートラジオグラフィによる粒界および粒界析出相への水素集積の透過観察

抄録

The behavior of hydrogen trapping sites in an austenitic stainless steel SUS316L exposed at 253 K was investigated by tritium transmission electron microscopic autoradiography. From the analysis of diffraction pattern and the orientation relationships between the grain boundaries the predominant tritium trapping sites are found at the grain boundaries with index number planes of high order than those with index numbers of low order. The length of hydrogen trapping sites the plane defects on the grain boundaries was about 3.23 μm. The number of the blackened silver particles was about 32 pieces. The tritium trapping sites exposed at 253 K were observed at precipitates (Cr₂₃C₆) and plane defects structure on the grain boundaries, in the vicinity of the triple points, at facet corners of twins, dislocations, and interfaces between precipitates and the matrix plane.