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Numerical modeling and experimental validation of thermal history and microstructure for additive manufacturing of an Inconel 718 product

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Abstract

A product-scale part was additively manufactured from Inconel 718 by laser powder-bed fusion. The thermal and microstructural behavior was experimentally examined to reveal physical characteristics while a high fidelity numerical model was developed to predict characteristics throughout the part volume. Three physical characteristics were considered in the present study: (1) thermal evolution during the build, (2) melt pool configuration, and (3) the final microstructure as-deposited. Thermal simulations were performed by finite element calculation while the microstructure was predicted from the calculated thermal history and existing theoretical correlations. Predicted results were thoroughly confirmed through comparison with experimental measurements. Ultimately, the present work aims to illustrate the integration of the computational method as tools to provide manufacturing qualification for part production by AM.

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Acknowledgements

PP is grateful for support from the Royal Thai Government and the Bertucci Graduate Fellowship for this research. PCP and ADR acknowledge support from an Early Stage Innovations Grant, number NNX 17AD03G, from NASA’s Space Technology Research Grants Program.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA

    Patcharapit Promoppatum & Shi-Chune Yao

  2. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, USA

    P. Chris Pistorius & Anthony D. Rollett

  3. Center for Innovative Materials Processing through Direct Digital Deposition (CIMP-3D), Applied Research Laboratory, Pennsylvania State University, State College, PA, USA

    Peter J. Coutts, Frederick Lia & Richard Martukanitz

Authors
  1. Patcharapit Promoppatum
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  2. Shi-Chune Yao
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  3. P. Chris Pistorius
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  6. Frederick Lia
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  7. Richard Martukanitz
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Correspondence to Shi-Chune Yao.

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Promoppatum, P., Yao, SC., Pistorius, P.C. et al. Numerical modeling and experimental validation of thermal history and microstructure for additive manufacturing of an Inconel 718 product. Prog Addit Manuf 3, 15–32 (2018). https://doi.org/10.1007/s40964-018-0039-1

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  • DOI: https://doi.org/10.1007/s40964-018-0039-1

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