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Kinetics modeling of austenite decomposition for an end-quenched 1045 steel

机译：淬火1045钢奥氏体分解的动力学模型

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摘要

Finite element simulations that predict the microstructure and properties of heat-treated steels can be significantly improved by incorporating appropriate models for the kinetics of various austenite transformations. In the present study the austenite decomposition kinetics for a 1045 steel was modeled using a modification of the transformation equation proposed by Li et al. [1]. The kinetics of the continuous cooling transformation were determined directly from an isothermal transformation diagram. To verify the predictions of the model, an end-quench test was used because it produces a wide range of microstruc-tures. The microstructures predicted by the kinetics model for the end-quenched sample were confirmed by quantification of the microstructures observed in the end-quench experiments. Furthermore, the predicted hardness profile was in good agreement with the experimentally measured hardness profile. The kinetics model developed in the present study was compared to the models proposed by Kirkaldy and Venugopalan [2] and the unmodified model by Li. The present model provides a more accurate prediction. A microstructural-based hardness equation from the literature was also evaluated and it predicted hardness values that were above the experimentally measured values. The model we propose predicts the experimental hardness profile more accurately, since it is based on the calculated microstructure and experimental hardness values of martensite, bainite, and ferrite/pearlite.
机译：通过纳入各种奥氏体转变动力学的适当模型，可以显着改善预测热处理钢的显微组织和性能的有限元模拟。在本研究中，使用Li等人提出的变换方程的修正对1045钢的奥氏体分解动力学进行了建模。 [1]。连续冷却转变的动力学直接由等温转变图确定。为了验证模型的预测，使用了终止淬火测试，因为它会产生广泛的微观结构。通过动力学模型预测的最终淬火样品的微观结构通过量化在最终淬火实验中观察到的微观结构得以证实。此外，预测的硬度分布与实验测得的硬度分布非常吻合。本研究开发的动力学模型与Kirkaldy和Venugopalan提出的模型[2]以及Li的未修改模型进行了比较。本模型提供了更准确的预测。还评估了文献中基于微观结构的硬度方程，该方程预测的硬度值高于实验测量值。我们提出的模型可以更准确地预测实验硬度分布，因为它基于马氏体，贝氏体和铁素体/珠光体的显微组织和实验硬度值。

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