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Structural Performance of Inconel 625 Superalloy Brazed Joints

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Abstract

The purpose of this work was to investigate tensile and fatigue behaviors of Inconel 625 superalloy brazed joints after transient liquid-phase bonding process. Brazing was performed in a vacuum furnace using a nickel-based filler metal in a form of paste to join wrought Inconel 625 plates. Mechanical tests were carried out on single-lap joints under various lap distance-to-thickness ratios. The fatigue crack initiation and crack growth modes were examined via metallographic analysis, and the effect of local stress on fatigue life was assessed by finite element simulations. The fatigue results show that fatigue strength and endurance limit increase with overlap distance, leading to a relatively large scatter of results. Fatigue cracks nucleated in the high-stressed region of the weld fillets from brittle eutectic phases or from internal brazing cavities. The present work proposes to rationalize the results by using the local stress at the brazing fillet. When using this local stress, all fatigue-obtained results find themselves on a single S-N curve, providing a design curve for any joint configuration in fatigue solicitation.

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Acknowledgments

The authors acknowledge the Center for Research and Innovation in Aerospace in Quebec (CRIAQ) and Pratt and Whitney Canada for financial support to conduct this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Ecole de technologie supérieure, 1100 Notre-Dame West, Montreal, QC, H3C 1K3, Canada

    Jianqiang Chen, Vincent Demers, Eve-Line Cadotte & Philippe Bocher

  2. Pratt and Whitney Canada, 1000 boul. Marie-Victorin, Longueuil, QC, J4G 1A1, Canada

    Daniel Turner

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  1. Jianqiang Chen
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  2. Vincent Demers
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  3. Eve-Line Cadotte
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  4. Daniel Turner
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  5. Philippe Bocher
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Correspondence to Jianqiang Chen.

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Chen, J., Demers, V., Cadotte, EL. et al. Structural Performance of Inconel 625 Superalloy Brazed Joints. J. of Materi Eng and Perform 26, 547–553 (2017). https://doi.org/10.1007/s11665-016-2491-8

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  • DOI: https://doi.org/10.1007/s11665-016-2491-8

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