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Simulation of Cooling Rate Effects on Ti–48Al–2Cr–2Nb Crack Formation in Direct Laser Deposition

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Abstract

Transient temperature history is vital in direct laser deposition (DLD) as it reveals the cooling rate at specific temperatures. Cooling rate directly relates to phase transformation and types of microstructure formed in deposits. In this paper, finite element analysis simulation was employed to study the transient temperature history and cooling rate at different experimental setups in the Ti–48Al–2Cr–2Nb DLD process. An innovative prediction strategy was developed to model with a moving Gaussian distribution heat source and element birth and death technology in ANSYS®, and fabricate crack-free deposits. This approach helps to understand and analyze the impact of cooling rate and also explain phase information gathered from x-ray diffraction.

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Acknowledgements

This project was supported by The Boeing Company through the Center for Aerospace Manufacturing Technologies (CAMT), National Science Foundation Grant # CMMI-1547042, and the Intelligent Systems Center (ISC) at Missouri S&T. Their financial support is greatly appreciated.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO, USA

    Lei Yan, Wei Li, Xueyang Chen, Yunlu Zhang & Frank Liou

  2. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, USA

    Joe Newkirk

  3. The Boeing Company, St. Louis, MO, USA

    David Dietrich

Authors
  1. Lei Yan
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  2. Wei Li
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  3. Xueyang Chen
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  4. Yunlu Zhang
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  5. Joe Newkirk
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  6. Frank Liou
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  7. David Dietrich
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Correspondence to Lei Yan.

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Yan, L., Li, W., Chen, X. et al. Simulation of Cooling Rate Effects on Ti–48Al–2Cr–2Nb Crack Formation in Direct Laser Deposition. JOM 69, 586–591 (2017). https://doi.org/10.1007/s11837-016-2211-8

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  • DOI: https://doi.org/10.1007/s11837-016-2211-8

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