Continuous cooling transformation behaviour and kinetic regression model of NVE36 steel

Continuous cooling transformation (CCT) curves of NVE36 steel were measured by thermal dilatometer. The microstructures at room temperature were observed by optical microscope and the hardness was tested with a Vickers hardness tester. Data processing was carried out at the platform of Matlab software, and the relationship model of phase transformation temperature and cooling rate and the kinetic regression model were established. After regressive calculations the optimal coefficients of the models for this steel were obtained. Finally, the measured and calculated kinetic behaviors during continuous cooling of NVE36 steel were compared. It is shown that the calculated result is in reasonable agreement with the experimental data, proving the rationality of the models established and the feasibility of data processing methods.