Elucidating the Temperature Dependence of TRIP in Q&P Steels Using Synchrotron X-Ray Diffraction, Constituent Phase Properties, and Strain-Based Kinetics Models
Elucidating the Temperature Dependence of TRIP in Q&P Steels Using Synchrotron X-Ray Diffraction, Constituent Phase Properties, and Strain-Based Kinetics Models
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DOI：
10.1016/j.actamat.2022.118126
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发表时间：
2022-07
期刊：
影响因子：
9.4
通讯作者：
C. Finfrock;B. Ellyson;Ranga Jai Sri Likith;Douglas T. Smith;C. Rietema;A. Saville;Melissa M. Thrun;C. Becker;A. L. Araujo;E. Pavlina;Jun Hu;Jun-Sang Park;A. Clarke;K. Clarke
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作者：
C. Finfrock;B. Ellyson;Ranga Jai Sri Likith;Douglas T. Smith;C. Rietema;A. Saville;Melissa M. Thrun;C. Becker;A. L. Araujo;E. Pavlina;Jun Hu;Jun-Sang Park;A. Clarke;K. Clarke
理解形变诱发马氏体相变（DIMT）对于解释控制相变诱发塑性（TRIP）辅助钢性能的结构-性能关系至关重要。然而，现代TRIP辅助钢往往表现出DIMT动力学，不容易捕获现有的经验模型的基础上，体积拉伸应变。我们通过结合体相单轴拉伸试验和原位高能同步加速器X射线衍射来解决这一挑战，从而解决了每个组成相的相体积分数、应力-应变响应和微观结构演变。实施的Olson-Cohen模型的修改，它描述的马氏体相变动力学作为在奥氏体中的估计分区应变的函数，而不是体拉伸应变。这个DIMT动力学模型被用作一个框架，以澄清一个不充分理解的韧性槽报告TRIP辅助钢在高温下变形过程中的根本原因。温度依赖性的韧性的重要性进行了讨论，修改变形过程中定制的DIMT动力学和机械性能在形成和服务的机会的基础上。
Understanding the deformation-induced martensitic transformation (DIMT) is critical for interpreting the structure-property relationships that govern the performance of transformation-induced plasticity (TRIP) assisted steels. However, modern TRIP-assisted steels often exhibit DIMT kinetics that are not easily captured by existing empirical models based on bulk tensile strain. We address this challenge by combined bulk uniaxial tensile tests andin-situhigh energy synchrotron X-ray diffraction, which resolved the phase volume fractions, stress-strain response, and microstructure evolution of each constituent phase. A modification of the Olson-Cohen model is implemented, which describes the martensitic transformation kinetics as a function of the estimated partitioned strain in austenite, rather than the bulk tensile strain. This DIMT kinetic model is used as a framework to clarify the root cause of an insufficiently understood toughness trough reported for TRIP-assisted steels during deformation at elevated temperatures. The importance of the temperature-dependent toughness is discussed, based on the opportunity to modify deformation processes to tailor the DIMT kinetics and mechanical properties during forming and in service.