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The dissolved Nb contents in four high-Nb steels were quantitatively measured after hot deformation at 925 °C and reheating at 600 °C. The Nb carbonitride precipitation kinetics in austenite and in acicular ferrite were studied, and the effects of Nb carbonitride on the precipitation hardness were discussed. The results show that the nucleation rate of Nb precipitation in austenite is strongly depended...
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