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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Discussion on the Rate Controlling Process of Coarsening of Niobium Carbonitrides in a Niobium Microalloyed Steel
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Discussion on the Rate Controlling Process of Coarsening of Niobium Carbonitrides in a Niobium Microalloyed Steel

机译：铌微合金钢中碳氮化铌粗化速率控制过程的探讨

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摘要

Austenite grain growth in microalloyed steels is governed by the coarsening of fine precipitates present at grain boundaries below the grain coarsening temperature. Zener model is widely used in metals to describe the pinning effect of second phase particles precipitated in the matrix. In this work it has been discussed whether grain boundary or volume diffusion is the rate controlling process for the coarsening of the niobium carbonitrides. Calculations on austenite grain growth kinetics, obtained coupling Zener theory and both rate controlling processes of precipitate coarsening, have been compared against experimental austenite grain size results under non-isothermal heating conditions. In this sense, it has been concluded that the coarsening of niobium carbonitrides is mainly controlled by volume diffusion of Nb in austenite.
机译：微合金钢中奥氏体晶粒的生长受晶粒粗化温度以下晶粒边界处细小析出物的粗化控制。齐纳模型在金属中被广泛使用，以描述沉淀在基体中的第二相颗粒的钉扎效应。在这项工作中，已经讨论了晶界或体积扩散是碳氮化铌粗化的速率控制过程。在非等温加热条件下，将结合齐纳理论和沉淀物粗化速率控制过程获得的奥氏体晶粒生长动力学计算结果与实验奥氏体晶粒度结果进行了比较。从这个意义上讲，已经得出结论，碳氮化铌的粗化主要受奥氏体中Nb的体积扩散控制。

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