Precipitation Behavior of Vanadium in HRB500E Steel
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摘要: 试验测定了钒在钢中的固溶和析出温度,研究了析出行为的热力学、动力学。结果表明,成分为C:0.25%,V:0.05%,N:0.011%钢中钒在1 040℃左右开始析出,V含量增加,V (C,N)开始析出温度升高,N含量增加,后期析出的VCxN1-x系数x越小;高温下以富氮形式析出,低温下以富碳形式析出。对比选择了位错线上的形核机制,简化为球形析出物的形核长大模型,以钒的传质为限制性环节,计算表明析出物的长大速率随钒界面浓度的增大而减小,随析出物半径的增大而减小。Abstract: In this study the solid solution and precipitation temperature of vanadium in steels had been experimentally determined,and the thermodynamics and kinetics of vanadium particle precipitation had been studied.For the steel with chemical compositions of 0.25%C-0.05%V-0.011%N,the V(C,N) particle begins precipitate at 1 040 ℃.The precipitation temperature rises with increasing V content,while the combination index x of VCxN1-x decreases as the content of N increasing.V particle is rich in nitrogen at high temperature precipitates and rich in carbon at lower temperature precipitates.A model of dislocation nucleation in a spherical grain is presented to explain its nucleation and growth mechanism.Taking the mass transfer of vanadium as a constrain factor,the calculation result indicates that the growth rate of precipitates decreases with higher interfacial vanadium concentration and bigger precipitate size.
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Key words:
- vanadium /
- thermodynamics /
- dynamics /
- precipitation /
- nucleation and growth /
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