Solidification microstructure during selective laser melting of Ni based superalloy: experiment and mesoscopic modelling

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

Li, Yuze^1^2 ; Olmedilla, Antonio^1 ; Zalonik, Miha^1 ; Zollinger, Julien^1 ; Dembinski, Lucas^3 ; Mathieu, Alexandre^4

Institut Jean Lamour, CNRS, Université de Lorraine, Nancy

F-54011, France^1

IRT M2P, Metz

F-57078, France^2

LERMPS, ICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, Belfort

F-90010, France^3

Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303, CNRSUniversité Bourgogne-Franche Comté, 12 rue de la Fonderie, Le Creusot

F-71200, France^4

关键词: Columnar dendrites;    Dendrite structures;    Local solidification;    Mesoscopic modelling;    Ni-based superalloys;    Secondary dendrite arm spacing;    Selective laser melting (SLM);    Solidification microstructures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012004/pdf
DOI  :  10.1088/1757-899X/529/1/012004

来源: IOP

【 摘 要 】

A set of single track laser melting experiments was performed in a selective laser melting (SLM). The tracks were done on an Inconel 718 plate with various laser scan velocities at a constant laser power of 150 W. The geometries of the molten pool (MP), as well as the solidified dendrite structures, i.e., primary and secondary dendrite arm spacing (PDAS and SDAS), in the cross sections of the molten path were characterized to evaluate the effect of the laser scan velocity during SLM. Moreover, the local solidification thermal conditions (cooling rate R∗, tip growth velocity V∗ and temperature gradient G∗) at the MP bottom were deduced from the SDAS and the geometries of the molten pool. Finally, the mesoscopic envelope model was used to simulate the PDAS selection of the columnar dendrite growth in the molten pool. The simulated results were compared with the experimental data, and a good agreement was achieved under different laser scan velocities.