Rapid cycles of heat treatment were given to various Fe-C alloys with
different initial morphology and carbon cotent between 0.03 and 0.98%C
. The specimens were heated up to temperatures between 600 and 1000 de
grees C by passing a high-amperage (10(3) - 10(4) A) alternating curre
nt through them. The microstructural investigation was performed by li
ght and electron microscopy as well as electron microprobe measurement
s. The results of the study are discussed in terms of the mechanisms o
f phase transformations, taking account of various parameters like car
bon content, primary microstructure, temperature and heating rate.