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Microstructures and Microhardness Properties of CMSX-4® Additively Fabricated Through Scanning Laser Epitaxy (SLE)

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Abstract

Epitaxial CMSX-4® deposition is achieved on CMSX-4® substrates through the scanning laser epitaxy (SLE) process. A thorough analysis is performed using various advanced material characterization techniques, namely high-resolution optical microscopy, scanning electron microscopy, energy-dispersive x-ray spectroscopy, x-ray diffraction, and Vickers microhardness measurements, to characterize and compare the quality of the SLE-fabricated CMSX-4® deposits to the CMSX-4® substrates. The results show that the CMSX-4® deposits have smaller primary dendritic arm spacing, finer γ/γ′ size, weaker elemental segregation, and higher microhardness compared to the investment cast CMSX-4® substrates. The results presented here demonstrate that CMSX-4® is an attractive material for laser-based AM processing and, therefore, can be used in the fabrication of gas turbine hot-section components through AM processing.

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Acknowledgments

This work was sponsored by the Office of Naval Research through Grant N00014-11-1-0670 as part of the Cyber-enabled Manufacturing Systems (CeMS) program.

Conflict of interest

Dr. Suman Das is a co-founder of DDM Systems, a start-up company commercializing the SLE technology. Dr. Das and Georgia Tech are entitled to royalties derived from DDM Systems’ sale of products related to the SLE research described in this paper. This study could affect their personal financial status. The terms of this arrangement have been reviewed and approved by Georgia Tech in accordance with its conflict of interest policies.

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Basak, A., Holenarasipura Raghu, S. & Das, S. Microstructures and Microhardness Properties of CMSX-4® Additively Fabricated Through Scanning Laser Epitaxy (SLE). J. of Materi Eng and Perform 26, 5877–5884 (2017). https://doi.org/10.1007/s11665-017-3008-9

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  • DOI: https://doi.org/10.1007/s11665-017-3008-9

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