On the Crystallographic Features of Cr_2N Precipitates in High-Nitrogen Austenitic Stainless Steel II. TEM Study on the Crystal Structure of Cr_2N

摘要

In the second part of this study, the crystal structure of Cr_2N precipitates was investigated utilizing transmission electron microscopy (TEM). Based on the analyses of SAD patterns with various zone axes, the crystal structure of Cr2N was confirmed to be trigonal belonging to the space group P31m, and could be explained in terms of epsilon-type occupational-ordering model. Three sets of superlattice reflections (001), (1/3 1/3 0) and (1/3 1/3 1) distinguishing trigonal from hcp were identified in Cr_2N superstructure, and the important characteristics of these reflections were discussed in comparison with the previous studies.