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Influence of scan strategy and process parameters on microstructure and its optimization in additively manufactured nickel alloy 625 via laser powder bed fusion

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Abstract

Laser powder bed fusion (L-PBF) as an additive manufacturing process produces nearly fully dense nickel alloy 625 (IN625) parts with complex features. L-PBF generates surfaces and microstructure through directional solidification that can be controlled by scan strategies and selection of process parameters. This study provides experimental investigations on microstructure formation including sizes of cellular grains and growth directions of columnar grains on the nickel alloy 625 test coupons. The effects of process parameters including laser power, scan velocity, hatch distance, and scan strategy that produce various solidification cooling rates and thermal gradients during the process, which also contribute to resultant microstructure, have been analyzed. Optimization studies are conducted on several objectives to improve the productivity while controlling the process effects on the resultant microstructure using response surface regression, desirability functions, and multi-objective genetic algorithm optimization.

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Authors and Affiliations

  1. Department of Industrial & Systems Engineering, Rutgers, The State University of New Jersey, 96 Frelinghuysen Road, Piscataway, NJ, 08854, USA

    Yiğit M. Arısoy, Luis E. Criales & Tuğrul Özel

  2. National Institute of Standards and Technology, Engineering Laboratory, Gaithersburg, MD, USA

    Brandon Lane, Shawn Moylan & Alkan Donmez

Authors
  1. Yiğit M. Arısoy
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  2. Luis E. Criales
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  3. Tuğrul Özel
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  4. Brandon Lane
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  5. Shawn Moylan
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  6. Alkan Donmez
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Correspondence to Tuğrul Özel.

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Official contribution of the National Institute of Standards and Technology (NIST); not subject to copyright in the USA. The full descriptions of the procedures used in this paper require the identification of certain commercial products. The inclusion of such information should in no way be construed as indicating that such products are endorsed by NIST or are recommended by NIST or that they are necessarily the best materials, instruments, software, or suppliers for the purposes described.

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Arısoy, Y.M., Criales, L.E., Özel, T. et al. Influence of scan strategy and process parameters on microstructure and its optimization in additively manufactured nickel alloy 625 via laser powder bed fusion. Int J Adv Manuf Technol 90, 1393–1417 (2017). https://doi.org/10.1007/s00170-016-9429-z

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  • DOI: https://doi.org/10.1007/s00170-016-9429-z

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