COMPLEX HETEROGENEOUS PRECIPITATION IN TITANIUM- NIOBIUM MICROALLOYED Al-KILLED HSLA STEELS-II. NON-TITANIUM BASED PARTICLES

摘要

An analytical electron microscopical investigation of three Ti-Nb Al deoxidized steels with differ- ent N:Ti ratios has been undertaken. In each steel, a large number of small(<, 10 nm)particles were observed. Parallel electron energy loss spectroscopy(PEELS)showed that their compositions in the three steels were consistent with those reported for the caps on the TiN cores in the equivalent steels in Part I, i.e.NbC_0.7N_0.3, NbC and(Nb_0.7Ti_0.3)C, respectively.