ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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The characteristics of Ti-Nb complex carbonitride precipitates in microalloyed steels have been investigated by analytical electron microscopy. The steels were solution treated at 1390 °C and quenched, and then aged between 940 to 1200 °C. During the aging, only mixed Ti-Nb carbonitride precipitates were found among the newly nucleated and growing particles. The precipitates grew rapidly to an initial average size of about 7 nm, followed by slow coarsening. The spherical precipitates remained in steels 1 and 2 during coarsening, but partly converted to a cuboidal shape in steel 3. For solution temperature (1390 °C), the precipitates tend to be TiN-rich and depend weakly on steel composition; at low aging temperatures they tend to be strongly dependent on the steel composition. There is a dependence of composition on particle size for short aging times. The youngest of these particles, which approach the size of critical nuclei, tend to be Ti-rich. The coexistence of different particle morphologies and compositions after long aging times indicates that complete mutual solid solubility of carbides and nitrides may not exist near 1000 °C.
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Ti-Nb carbonitride, microalloyed steel, electron microscopy, precipitates, phase stability
Como citar
Zou, Heilong; Kirkaldy, J.S..
Characterization of Ti-Nb Carbonitride in Microalloyed Steels by Analytical Electron Microscopy,
p. 259-274.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v1-259-274
