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Effect of Linear Energy Density on Bubble-Defect of 316L Stainless Steel by Selective Laser Melting

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Abstract:

In the experiments of different process parameters (laser power, scanning speed and scanning distance),the low-time defects of forming part were studied by microscope,including air bubble, pore, micro-crack and macro-crack. The formation mechanism of bubble-defect was analyzed.Linear energy density (E=P/v) was introduced as synthetic parameter.According to analysis and test verification, the optimum technological parameters of 316L stainless steel were laser power 190-210KW, laser speed 800-1000mm/s and scanning interval 0.9-0.11mm,and the linear energy density was about 200J/m. There were no cracks, no bubbles, a small amount of porosity, and the product density reached 99.7%.

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Periodical:

Key Engineering Materials (Volume 803)

Pages:

32-36

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.803.32

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Online since:

May 2019

Authors:

Wen Hao Wang*, Xin Yu Liu, Lu Pan

Keywords:

Crack, Defect Analysis, Liner Energy Density, Pore, Selective Laser Melting

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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