Quantitative evaluation of dynamic precipitation kinetics in a complex Nb-Ti-V microalloyed steel using electrical resistivity measurements

The kinetics of dynamic precipitation in austenite of a complex Nb-Ti-V microalloyed steel during hot compression at 900 °C with a strain rate of 6.7 s −1 was quantitatively investigated through electrical resistivity measurements. The dynamic precipitation in the Nb-Ti-V microalloyed steel started at a strain of 0.15. The amount of tiny Nb-rich (Nb,Ti,V)C carbides, which were precipitated at crystal defects gradually increased up to 0.02 wt% at a maximum strain of 0.67. The electrical resistivity was successfully applied to the quantitative evaluation of dynamic precipitation kinetics in microalloyed steel by excluding the effects of crystal defects and interstitial atoms on the electrical resistivity.