不同载荷条件下Fe-Ni合金中马氏体相变的相场模拟  

Phase field simulation of martensitic phase transformation in Fe-Ni alloys under different loading conditions

作　　者：刘庚根 满蛟[1] 王庆田 王俊成 杨斌 LIU Geng-gen;MAN Jiao;WANG Qing-tian;WANG Jun-cheng;YANG Bin(School of Mechanical Engineering,Xinjiang University,Urumqi 830017,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830017

出　　处：《兰州理工大学学报》2025年第2期8-16,共9页Journal of Lanzhou University of Technology

基　　金：新疆维吾尔自治区高层次人才天池计划(100400028)。

摘　　要：基于Fe-Ni合金马氏体相变的相场模型,建立耦合外加载荷和塑性变形的弹塑性相场模型.模拟了不同载荷条件下Fe-Ni多晶合金中的马氏体相变行为,对相变过程中变体形核生长、应力分布以及体积分数进行分析讨论.在模拟过程中,通过模拟结果与相关实验进行对比以保证相场模型的合理性.模拟结果表明:在形核长大过程中,外加拉伸载荷下相变的成核点位多于压缩载荷和无载荷状态;此过程应力主要集中在不同变体之间的相界面处,而变体内部的应力较小;外加拉伸载荷增大相变中的体积分数,加速马氏体相变动力学过程,而外加压缩载荷则提供相反的效果.拉伸载荷相比于压缩载荷,垂直于惯习面的载荷分量降低了系统的总自由能,拉伸比压缩条件下更易于发生马氏体相变.Based on the phase field model of martensitic phase transformation in Fe-Ni alloys,an elastic-plastic phase field model coupling applied load and plastic deformation is established.The martensitic phase transformation behaviour in Fe-Ni polycrystalline alloys under different loading conditions is simulated,and the growth of variant nuclei,stress distribution and volume fraction during the phase transformation process are analyzed and discussed.During the simulation process,the simulation results are compared with relevant experiments to ensure the reasonableness of the phase field model.The simulation results showed that,in the nucleation growth process,the nucleation points of the phase transformations under the applied tensile load are more than those under the compressive load and the no-load state.The stresses in this process are mainly concentrated at the phase interface between different variants,while the stresses inside the variants are small.An applied tensile load increases the volume fraction in the phase transition and accelerates the kinetic process of the martensitic phase transition,while an applied compressive load provides the opposite effect.The load component perpendicular to the plane of inertia reduces the total free energy of the system for tensile loads compared to compressive loads,and the martensitic phase transformation is more likely to occur under tensile than compressive conditions.

关 键 词：马氏体相变 相场模拟 多晶 外加载荷 

分 类 号：TG146[一般工业技术—材料科学与工程]