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首页> 美国卫生研究院文献>Materials >TRIP Steels: A Multiscale Computational Simulation and Experimental Study of Heat Treatment and Mechanical Behavior
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TRIP Steels: A Multiscale Computational Simulation and Experimental Study of Heat Treatment and Mechanical Behavior

机译：TRIP钢：热处理和力学行为的多尺度计算模拟和实验研究

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摘要

A multiscale investigation of the microstructure and the mechanical behavior of TRIP steels is presented. A multi-phase field model is employed to predict the microstructure of a low-alloy TRIP700 steel during a two-stage heat treatment. The resulting stability of retained austenite is examined through the temperature. The phase field results are experimentally validated and implemented into a model for the kinetics of retained austenite during strain-induced transformation. The kinetics model is calibrated by using experimental data for the evolution of the martensite volume fraction in uniaxial tension. The transformation kinetics model is used together with homogenization methods for non-linear composites to develop a constitutive model for the mechanical behavior of the TRIP steel. A methodology for the numerical integration of the constitutive equations is developed and the model is implemented in a general-purpose finite element program (ABAQUS). Necking of a bar in uniaxial tension is simulated and “forming limit diagrams” (FLDs) for sheets made of TRIP steels are calculated. The models developed provide an integrated simulation toolkit for the computer-assisted design of TRIP steels and can be used to translate mechanical property requirements into optimised microstructural characteristics and to identify the appropriate processing routes.
机译：提出了TRIP钢的微观组织和力学行为的多尺度研究。采用多相场模型来预测两阶段热处理过程中低合金TRIP700钢的显微组织。通过温度检查所得残余奥氏体的稳定性。实验验证了相场结果，并将其实施到应变诱发相变过程中残余奥氏体动力学的模型中。通过使用实验数据对动力学模型进行校准，以得出马氏体体积分数在单轴拉伸中的变化。将转化动力学模型与均质化方法一起用于非线性复合材料，以开发出TRIP钢力学行为的本构模型。开发了本构方程数值积分的方法，并在通用有限元程序（ABAQUS）中实现了该模型。模拟了单轴拉力杆的颈缩，并计算出TRIP钢制成的板材的“成形极限图”（FLD）。开发的模型为TRIP钢的计算机辅助设计提供了集成的仿​​真工具包，可用于将机械性能要求转化为优化的微结构特征并确定合适的加工路线。

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