Abstract
Friction welding or electron/laser beam welding of nickel superalloys compromises the microstructure with localized melting and heat-affected zones (HAZ). In this work, Field-Assisted Sintering Technology (FAST) is studied as an alternative method for solid-state diffusion bonding of superalloys CM247LC and Inconel 718. Bonding microstructures and room-temperature tensile strengths are evaluated. Preliminary results suggest that FAST bonding leads to an interface with a compositional gradient without producing a HAZ and without losing tensile strength.
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The authors would like to thank material donations from the Air Force Research Laboratory. The authors also would like to thank Scott Pistner and Kevin Busko (ARL/PSU) for their technical assistance in FAST joining and Donald Stiver (ARL/PSU) for his assistance in die design. This work was supported by the Government under Agreement No. W911W6-17-2-0003, through the Penn State Vertical Lift Research Center of Excellence. The US Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation thereon. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Aviation Development Directorate or the US Government. This work was also partly supported by the Applied Research Laboratory at The Pennsylvania State University (ARL/PSU) through subcontract #S-160-000-001 under a UES, Inc. Phase II SBIR (FA8650-19-C-2051).
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Manuscript submitted November 17, 2020; accepted March 26, 2021.
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Lin, C.I., Yamamoto, N., King, D.S. et al. Solid-State Joining of Dissimilar Ni-Based Superalloys via Field-Assisted Sintering Technology for Turbine Applications. Metall Mater Trans A 52, 2149–2154 (2021). https://doi.org/10.1007/s11661-021-06274-w
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DOI: https://doi.org/10.1007/s11661-021-06274-w