Phase field study of spacing evolution during wire and laser additive manufacturing under transient conditions

Joint 5th International Conference on Advances in Solidification Processes;5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining

土木建筑工程;计算机科学

Wang, Zheng^1 ; Jing, Tao^1 ; Dong, Hongbiao^2

Key Laboratory for Advanced Materials Processing Technology, School of Materials Science and Engineering, Tsinghua University, Beijing

100084, China^1

Department of Engineering, University of Leicester, Leicester

LE1 7RH, United Kingdom^2

关键词: Complex microstructures;    Computational framework;    Laser additive manufacturing;    Laser processing parameters;    Manufactured products;    Nickel- based superalloys;    Primary dendritic spacings;    Transient conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012003/pdf
DOI  :  10.1088/1757-899X/529/1/012003

来源: IOP

【 摘 要 】

Understanding the dynamic evolution of primary dendritic spacing in the laser melt pool is significant from a technological viewpoint because primary spacing is one of the foremost parameters that control the final mechanical properties of additive manufactured products. In this work, a multi-scale computational framework that couples FEM and a developed quantitative phase field method is employed to simulate the evolution of microstructure and primary spacing of a nickel-based superalloy during wire and laser additive manufacturing (WLAM) solidification. Transient conditions in the laser melt pool are considered in which both temperature gradient G and solidification speed VP are made time-dependent. Through the use of this model, the dendritic morphology, tip velocity and spacing evolution during the solidification are investigated to provide the relationship between the laser processing parameters and the final spacing. Moreover, we attempted to clarify the intrinsic mechanism of spacing adjustment under different laser processing parameters from a novel perspective. This work provides meaningful understanding of spacing evolution in nickel-based superalloy and demonstrates the potential of controlling the complex microstructure morphologies and final primary spacing during wire and laser additive manufacturing process.