Abstract
The precipitation of carbon in α-iron wires strained to different amounts was followed by means of internal friction measurements. As the amount of strain increased, the rate of precipitation became faster and the shapes of the time-transformation curves gradually changed, although no abrupt transitions in these curves were found. The results agreed with a theory for the diffusion-controlled growth of asymmetric particles, from which the number density of particles was computed. It was concluded that at 120°C the precipitation of carbon in undeformed and deformed α-iron occurs by the nucleation of carbide particles on dislocations and their subsequent growth by the diffusion of carbon. Segregation of carbon atoms to the dislocations by the Cottrell-Bilby process was therefore not the mechanism for draining the carbon from solution.
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