This study comprehensively investigates the kinetics of bainitic ferrite transformation in steel alloys by integrating experimental results, finite element analysis, and thermodynamic modeling. Using a dilatometer and Gleeble tests, empirical data were acquired to calibrate the Bhadeshia and Hensel-Spittel models, forming the basis for subsequent finite element simulations. Owing to the high importance of temperature in bainite transformation, the accuracy of the predicted temperature fields was validated precisely against experimental measurements, confirming the reliability of the methodology. A modified Bhadeshia model was proposed incorporating the influence of the applied shear stress on the activation energy, thereby emphasizing the temperature-dependent Cstress coefficient. The electron backscatter diffraction results validate the finite element model, and further exploration reveals the implications for fracture patterns and density changes due to bainitic transformation. This study contributes to a nuanced understanding of bainitic ferrite kinetics, offering valuable insights for alloy design and optimization under various thermomechanical conditions, and paving the way for advanced research on phase transformation kinetics and material behavior.

中文翻译：

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使用宏观有限元分析模拟贝氏体变换对钢流动行为的影响


本研究通过整合实验结果、有限元分析和热力学建模，全面研究了钢合金中贝氏体相变的动力学。使用膨胀计和 Gleeble 测试，获取了经验数据以校准 Bhadeshia 和 Hensel-Spittel 模型，为后续的有限元模拟奠定了基础。由于温度在贝氏体转变中非常重要，因此通过实验测量精确验证了预测温度场的准确性，证实了该方法的可靠性。提出了一个改进的 Bhadeshia 模型，该模型结合了施加的剪切应力对活化能的影响，从而强调了与温度相关的 Cstress 系数。电子背散射衍射结果验证了有限元模型，进一步的探索揭示了贝氏体变换对断裂模式和密度变化的影响。这项研究有助于对贝氏体铁氧体动力学的细致入微的理解，为各种热机械条件下的合金设计和优化提供了有价值的见解，并为相变动力学和材料行为的高级研究铺平了道路。