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A Study of Linear Friction Weld Microstructure in Single Crystal CMSX-486 Superalloy

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Abstract

The microstructure of linear friction welds in single crystal (SX) CMSX 486 superalloy was studied. Gleeble thermomechanical simulation of the welding process was also performed in order to understand the microstructural changes induced in the alloy during the joining process. Microstructural analysis of the welded and Gleeble-simulated specimens showed that extensive liquation occurred in the alloy during joining, which is in contrast to the general assumption that linear friction welding (LFW) occurs exclusively in the solid state. The study revealed the application of the compressive load during the forging stage of LFW induced rapid solidification of the resultant metastable liquid phase. Nevertheless, part of the liquid resulted in a continuous Hf-base oxide phase along the weld line. Possible ways of preventing the formation of the potentially deleterious oxide film and, thus, improve the prospect of applying LFW for the joining of CMSX-486 superalloy are suggested.

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Notes

  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  2. PHILIPS is a trademark of FEI Company, Hillsboro, OR.

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Acknowledgments

The authors acknowledge the financial support received from NSERC. The technical assistance of M. Guérin and E. Dalgaard for LFW of CMSX-486 is also greatly appreciated. One of the authors (OTO) is grateful to the University of Manitoba for the award of a Graduate Fellowship.

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Authors and Affiliations

  1. Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

    O. T. Ola (Doctoral Student), O. A. Ojo (Associate Professor) & M. C. Chaturvedi (Distinguished Professor Emeritus)

  2. National Research Council Canada, Institute for Aerospace Research, Aerospace Manufacturing Technology Centre, Montréal, PQ, H3T 2B2, Canada

    P. Wanjara (Project Leader and Group Leader)

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  1. O. T. Ola
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  2. O. A. Ojo
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  3. P. Wanjara
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  4. M. C. Chaturvedi
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Corresponding author

Correspondence to O. A. Ojo.

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Manuscript submitted February 22, 2011.

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Ola, O.T., Ojo, O.A., Wanjara, P. et al. A Study of Linear Friction Weld Microstructure in Single Crystal CMSX-486 Superalloy. Metall Mater Trans A 43, 921–933 (2012). https://doi.org/10.1007/s11661-011-0928-0

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