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Thermal behavior and formation mechanism of a typical micro-scale node-structure during selective laser melting of Ti-based porous structure

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Abstract

Selective laser melting (SLM) technology efficiently solves the current manufacturing challenges of high-performance porous structure components, due to its freeform fabrication principle. As the most basic and crucial structure element, the nodes of porous structure component play an important role in its mechanical property. In this study, finite element method was used to investigate the thermal behavior during SLM processing of micro-scale node-structure. The dynamic size of molten pool was continuously predicted and consequently the typical “necking” effect was found, which was consistent with the experiment results. Besides, the influence of laser scan speed on temperature and temperature gradient of molten pool was also analyzed. The results indicated that the “necking” effect became more conspicuous with the applied scan speed increasing, which significantly deteriorated the mechanical property of porous structure components.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51575267), the National Key Research and Development Program “Additive Manufacturing and Laser Manufacturing” (No. 2016YFB1100101), the NSFC-DFG Sino-German Research Project (No. GZ 1217), the Key Research and Development Program of Jiangsu Provincial Department of Science and Technology of China (No. BE2016181), the Aeronautical Science Foundation of China (No. 2015ZE52051), the Top-Notch Young Talents Program of China, and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Chenglong Ma, Dongdong Gu, Kaijie Lin & Wenhua Chen

  2. Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Chenglong Ma, Dongdong Gu, Kaijie Lin & Wenhua Chen

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  1. Chenglong Ma
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  2. Dongdong Gu
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Correspondence to Dongdong Gu.

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Ma, C., Gu, D., Lin, K. et al. Thermal behavior and formation mechanism of a typical micro-scale node-structure during selective laser melting of Ti-based porous structure. Journal of Materials Research 32, 1506–1516 (2017). https://doi.org/10.1557/jmr.2017.112

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  • DOI: https://doi.org/10.1557/jmr.2017.112

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