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Nb对奥氏体→铁素体相变动力学影响的模型 被引量:3

Modeling the Effect of Nb on Austenite → Ferrite Phase Transformation Kinetics
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摘要 在热模拟实验中,通过奥氏体区不同时间的等温得到具有不同固溶Nb%、相同晶粒尺寸的奥氏体,然后以1~5 K/s冷速冷却至室温获得连续冷却膨胀曲线.在Rios理论推导基础上,开发了一种基于Johnson-M ehl-Avrami-Kolmogorov(JM AK)方程和可加性法则的建模方法.建立了不同固溶Nb%条件下的奥氏体→铁素体相变动力学模型,结果表明,固溶Nb%对指数n没有影响,而动力学参数k随着固溶Nb%的增加而减小,即固溶拖拽效应增强. In thermal simulation tests, the austenite with the same grain size but different solute Nb% was obtained by holding at austenite region with various times. The dilation curve was recorded when the sample was cooled to room temperature with the cooling rate of 1 - 5 K/s. Originating from Rios' theoretical deduction, a modeling approach based on the JMAK(Johnson- Mehl-Avrami-Kolmogorov) equation and additivity rule was developed. The kinetic model of austenite to ferrite phase transformation under different solute Nb% was established. The results suggest that the exponential n is not affected by the solute Nb% , whereas the kinetic parameter k decreases with increasing solute Nb% that is an enhanced solute drag effect.
出处 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2016年第5期642-646,共5页 Journal of Northeastern University(Natural Science)
基金 国家自然科学基金资助项目(51204048 51204053) 辽宁省教育厅科学研究一般项目(L2013112)
关键词 相变 动力学模型 NB JMAK 可加性法则 phase transformation kinetic model Nb JMAK ( Johnson-Mehl-Avrami-Kolmogorov) additivity rule
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参考文献11

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