Aspects of the tempering transformation kinetics of Cr low alloyed steels

The paper analyses the kinetics of the carbide coherence loss and carbide c oalescence taking place during tempering of low-alloy steels without molybd enum. For complete and incomplete hardening, the thermo-kinetics parameters of coalescence, the values of the reaction constants and the experimental activation energy values have been calculated. These results have shown that the tempering kinetics for the first stage of tempering (the coherence loss) is different from that for the second stage of tempering (the carbide coalescence), respectively.