Modelling of kinetics of austenite formation in steels with different initial microstructures
Modelling of kinetics of austenite formation in steels with different initial microstructures
复制标题
DOI：
10.2355/isijinternational.41.1093
复制
发表时间：
2001-01-01
影响因子：
1.8
通讯作者：
De Andrés, CG
中科院分区：
文献类型：
--
作者：
Caballero, FG;Capdevila, C;De Andrés, CG
本工作的主要目的是研究不同初始显微组织的钢中控制奥氏体化过程的机制。在这项工作中，已被用来开发一个模型的非等温奥氏体形成的初始组织由铁素体和/或珠光体的钢中的奥氏体从不同的初始微观结构（纯和混合的微观结构）的文献中的汇编知识。模型中考虑了影响奥氏体形核和长大动力学的微观结构参数以及加热速率的影响。此外，由于热计量分析是一种经常用于研究钢中相变的技术，因此开发了第二种模型来描述钢的热计量行为并计算在奥氏体形成期间发生的长度的相对变化。动力学模型和计量学模型均已得到验证。实验动力学转变，临界温度以及由于奥氏体形成的整体收缩的大小与计算吻合良好。
The main aim of this work is to study the mechanisms that control the austenitisation process in steels with different initial microstructures. The compiled knowledge in literature regarding the isothermal formation of austenite from different initial microstructures (pure and mixed microstructures), has been used in this work to develop a model for non-isothermal austenite formation in steels with initial microstructure consisting of ferrite and/or pearlite. The microstructural parameters that affect the nucleation and growth kinetics of austenite, and the influence of the heating rate have been considered in the modelling. Moreover, since dilatometric analysis is a technique very often employed to study phase transformations in steels, a second model to describe the dilatometric behaviour of the steel and calculate the relative change in length which occurs during the austenite formation has been developed. Both kinetics and dilatometric models have been validated. Experimental kinetic transformation, critical temperatures as well as the magnitude of the overall contraction due to austenite formation are in good agreement with calculations.