Study on overlap ratio of pulse laser selective melting forming

QI Bin; LIU Yude; SHI Wentian; WANG Shuo; YANG Jin; ZHANG Feifei

doi:10.7510/jgjs.issn.1001-3806.2018.03.005

LASER TECHNOLOGY > 2018 > 42(3): 311-317. > DOI: 10.7510/jgjs.issn.1001-3806.2018.03.005

QI Bin, LIU Yude, SHI Wentian, WANG Shuo, YANG Jin, ZHANG Feifei. Study on overlap ratio of pulse laser selective melting forming[J]. LASER TECHNOLOGY, 2018, 42(3): 311-317. DOI: 10.7510/jgjs.issn.1001-3806.2018.03.005

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Study on overlap ratio of pulse laser selective melting forming

School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China

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Received Date: July 26, 2017
Revised Date: October 31, 2017
Published Date: May 24, 2018

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Abstract

Abstract

In order to study overlap ratio and overlap characteristics during pulse laser selective melting forming process, the overlap theoretical models of bow and parabola were adopted, and the forming experiments of single melting point, single cladding and multi-layer block were designed under different conditions to obtain the optimal overlap ratio. The results show that the width of single melting point increases with the increase of exposure time. The optimal overlap ratio between two melting tracks is 30% in the single cladding experiment when exposure time is 40μs~60μs. The overlap ratio is 50% when exposure time is 80μs. The overlap ratio is 60%, when exposure time is 100μs~120μs. The surface morphology of block is slat in the multi-layer block experiment when overlap ratio between two melting tracks is 50%. After the analysis of block density, defect, microstructure and tensile properties, sample density is up to 99.99%, when laser power is 200W, layer thickness is 50μm, exposure time is 100μs, point distance is 65μm and line spacing is 77μm. The research is helpful for understanding overlap characteristics and overlap ratio selection in pulse laser selective melting.
- laser technique,
- overlap ratio,
- overlap theory model,
- density,
- microstructure,
- tensile property

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References (29)

References

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