基于PFM-FEM的多变体马氏体转变过程模拟及模型参数灵敏度分析

PFM-FEM Based Simulation of Multi-Variant Martensitic Transformation Process and Sensitivity Analysis of Model Parameters

准确获取马氏体转变过程的微观表象特征是获取材料最佳性能的关键,在材料设计领域具有重要意义。马氏体转变过程受到多种参数的影响,定量分析各参数对马氏体转变影响的敏感程度是准确把握马氏体转变机理的关键。本研究采用相场方法,推导了马氏体由亚稳态向稳态转变的相场方程,采用有限元法对方程进行求解,并将求解结果可视化,分析得到马氏体形核、生长过程中不同位置的序参量变化曲线,揭示了马氏体转变过程的形核长大规律与动态变化特性,在此基础上设计了正交试验表,基于响应面法定量评估了不同参数对马氏体转变的影响与敏感程度。该研究有效解释和确定了马氏体转变规律,实现了对马氏体转变过程的定量评估,为确定马氏体转变规律、获取最优过程参数提供了有效途径,也为提高材料的力学性能奠定了重要的理论基础。

It is generally recognized that accurate acquisition of the microscopic representation of the martensite transformation process is crucial for obtaining the best performance of the material and exceedingly significant in the field of material design.There are multiple parameters that exert influence on the transformation process of martensite.Accordingly,the key to precisely grasp the transformation mechanism of martensite lies in the quantitative analysis of the sensitivity of each parameter to the influence of martensite transformation.In this work,we employed phase field method to deduce the phase field equation of martensite transformation from metastable to steady state.Then,the solutions of the equation were figured out by finite element method,and the solution results were visualized as well.The variation curve of order parameter at various positions during martensite nucleation and growth were obtained,which revealed the nucleation growth law and dynamic variation characteristics of martensite transformation.On this basis,we designed an orthogonal test and quantitatively evaluated the impact and sensitivity degree of diverse parameters on martensitic transformation by response surface method.This study effectively expounded and determined the martensite transformation law and realized the quantitative evaluation of the martensite transformation process.It also provides a valuable approach to determine the law of martensite transformation and acquire the optimal process parameters,paving the way for improving the mechanical properties of materials.