《Table 2.Phase-transition temperatures of the tested steels》

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《Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs》

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°C

The phase-transition temperatures（A1，A3）calculated using the Thermo-Calc software and the measured phase-transition temperatures（Ac1，Ac3）of the tested steels are shown in Table 2.The addition of V slightly increases the phase-transition temperature，as demonstrated in both the experimental and the calculation results，whereas the addition of Nb has little effect.Moreover，the calculated values are lower than the measured values.Although the heating rate was very low（0.05°C·s-1）in the experiments，some deviation from the equilibrium state was still observed；this deviation increased the transition temperature.