基于元胞自动机的金属增材制造孔洞附近微观组织模拟  

Simulation on Microstructure Near Proes in Metal Additive Manufacturing Based on Cellular Automata

作　　者：陈逸飞 周金宇 王林 CHEN Yifei;ZHOU Jinyu;WANG Lin(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou 213001,China;School of Mechanical and Electrical Engineering,Jinling University of Science and Technology,Nanjing 211199,China;Nanjing Chamlion Laser Technology Co.,Ltd.,Nanjing 210039,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001 [2]金陵科技学院机电工程学院,江苏南京211199 [3]南京铖联激光科技有限公司,江苏南京210039

出　　处：《热加工工艺》2024年第20期116-122,共7页Hot Working Technology

基　　金：国家自然科学基金项目(52075232);江苏省自然科学基金项目(BK20201112);国家重点研发计划项目(2022YFE0138500);江苏理工学院研究生实践创新项目(XSJCX22_18)。

摘　　要：基于元胞自动机和粉末尺度的热流耦合模型,提出一种气孔处三维微观组织模拟方法。利用MATLAB构建元胞自动机模型,对增材制造钛合金Ti-6Al-4V的二维微观组织进行模拟,其模拟结果与实验结果吻合。通过FLOW-3D和EDEM软件联合仿真,利用有限体积法对三维多道次的粉末床熔融过程进行仿真,得到了温度场信息。将元胞自动机模型拓展到三维尺度,把得到的温度场数据导入元胞自动机模型,对孔洞位置处的微观组织进行数值模拟,得到了微观组织分布。该方法有助于构建金属增材制造工艺设计、缺陷表征、性能评价多尺度模型,以及用于晶粒、缺陷分布和疲劳寿命等信息预测。A three-dimensional microstructure simulation method for gas pores was proposed based on a coupled thermal flow model of cellular automata and powder scale.A cellular automaton model was constructed using MATLAB to simulate the two-dimensional microstructure of titanium alloy Ti-6Al-4V produced by additive manufacturing,and the simulation results were consistent with the experimental results.Through the joint simulation of FLOW-3D and EDEM software,the finite volume method was used to simulate the three-dimensional multi-pass powder bed melting process,and the temperature field information was obtained.Expanding the cellular automata model to a three-dimensional scale,the obtained temperature field data was imported into the cellular automata model to numerically simulate the microstructure at the hole location,and the microstructure distribution was obtained.The method helps to construct a multi-scale model for metal additive manufacturing process design,defect characterization,performance evaluation,and it is used for predicting information such as grain size,defect distribution and fatigue life.

关 键 词：增材制造 元胞自动机 数值模拟 钛合金 气孔缺陷 

分 类 号：TG146.23[一般工业技术—材料科学与工程]