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The precipitation behavior in vanadium micro-alloyed steel |
FANG Fang |
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Abstract A kinetics model based on Johnson-Mehl-Avrami equation has been developed to predict the nucleation mechanisms and kinetics of V(C,N) precipitate in austenite in low carbon vanadium micro-alloyed steel (0.05%C-0.08%V) with four nitrogen contents. The results calculated by the model indicate that, the precipitates nucleated preferentially at dislocation; the nose temperature of V(C,N) precipitate in austenite is around 820℃; and the start times to precipitate decrease with increasing nitrogen. The experimental results obtained from stress-relaxation on Gleeble-1500D showed that, the nose temperature is 850 ℃, which shorted the error within 30 ℃.
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Received: 09 February 2009
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