Abstract
Continuous cooling transformation (CCT) diagrams of steel are the basis to determine the optimum heat treatment technology. Combined with metallography, the CCT diagram of medium–high carbon spring steel 60Si2CrA was obtained by dilatometric measurement at cooling rates from 0.5 to 50 K/s. It is found that ferrite, pearlite, and martensite were available in the experimental range. Taking into account of the incubation time and volume fraction evolution of the new phase, a new phase transformation kinetics model is established to estimate the fraction of ferrite and pearlite during continuous cooling process (CCP). Material constants in the model were determined and optimized by minimizing the errors between experimental and predicted data. The kinetics model was validated and proved its efficiency in predicting the new phase fraction of 60Si2CrA during continuous cooling and will probably constitute a useful tool for guiding the production process.
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