金属增材制造中微观组织相场法模拟研究进展

金属增材制造技术是近30年发展起来的一项具有战略意义的先进制造技术。目前对增材制造的研究主要集中在制造装备与控制系统研发、产品性能测试等方面,对构件内微观组织的形成以及宏微观结构性能的关系研究较少。本文简要介绍了金属增材制造发展现状以及在微观组织演化方面研究的不足,揭示了微观组织演化研究的重要性和迫切性。针对相场法的基本原理和优势,着重分析相场法应用于金属增材制造中的模型选取、非材料物性参数的确定等问题及解决方法,从相场数值模拟的角度来探讨工艺参数对微观组织的影响。文章最后指出利用相场法模拟金属增材制造过程中微观组织演化符合未来的发展趋势。

Current Research Status of Phase Field Simulation for Microstructures ofAdditively Manufactured Metals

Metal additive manufacturing is a strategic and innovative material forming technology that has been developed in nearly three decades.Current research for metal additive manufacturing mainly focuses on the equipment and control system R&D, product (component)testing,etc.,but few works touch the issues of microstructure evolution and microstructure-mechanical pro-perty relationship.The development status of metal additive manufacturing and research inadequacy for the produced metal compo-nents'microstructures are summarized in this paper,illustrating the necessity and urgency of microstructure evolution investigation. Based on an introduction of the fundamental principles and advantages of phase field simulation,the unresolved issues and tentative solutions for the model selection,parameters determination,etc.,are described emphatically.The influences of process parameters on product(component)microstructure are discussed from the perspective of phase field numerical simulation.Finally,the paper dis-plays the future development trend of exploring the metals'microstructure evolutions during additive manufacturing process by using phase field simulation.