  Kinetics of niobium and titanium carbide precipitates in iron has been
simulated with cluster dynamics. The simulations, carried out in austenite and
ferrite for niobium carbides, respectively in austenite for titanium carbide,
were analyzed for dependency on temperature, solute concentration, and initial
cluster distribution. The results are presented for different temperatures and
solute concentrations and compared to available experimental data. They show
little impact of initial cluster distribution beyond a certain relaxation time
and that highly dilute alloys with only monomers present a significantly
different behavior than less dilute alloys or alloys with different initial
cluster distribution.
