COMPLEX HETEROGENEOUS PRECIPITATION IN TITANIUM- NIOBUIM MICORALLOYED Al-KILLED HSLA STEELS-I. (Ti,Nb)(C,N)PARTICLES

摘要

Precipitation in Ti-N Al-killed microalloyed HSLA steels(Ti/N weight ratio from 4.4 to 1)was investigated in both the as-rolled and the normalised conditions analytical electron microscopy including parallel electron energy loss spectroscopy(PEELS). An extensive formation of heterogeneously nucleated complex(Ti, Nb)(C,N)particles down to 10 nm in size was observed. The core of such a complex particle is based on TiN and has a spherical, cubic or cruciform shape.