On the microstructure of a thin wall formed under thermal and stress fields induced in laser solid freeform fabrication process
by Masoud Alimardani, Christ P. Paul, Ehsan Toyserkani
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 5, No. 2/3, 2010

Abstract: In laser solid freeform fabrication (LSFF), the final microstructures and consequently the physical properties of the successive deposited layers of additive materials are determined through melting, solidification and solid state transformations caused by a moving laser beam. In this paper, temperature distribution and stress field induced during the multilayer LSFF process and their correlation with the local microstructure formation are studied throughout the fabrication of a four-layer thin wall of SS304L. For this purpose, parallel to the experimental investigation, a coupled 3D time-dependent numerical model is employed to simulate the process. The numerical and experimental results show that stress concentrations formed at the end points of the wall are the locations prone to potential delaminations and crack formations. Different types of microstructures, such as dendritic with and without secondary arm spacings, are observed at various locations within the same layer due to different cooling rates.

Online publication date: Sun, 10-Oct-2010

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