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Influence of Solid-State Diffusion during Equilibration on Microstructure and Fatigue Life of Superalloy Wide-Gap Brazements

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Abstract

The influence of solid-state diffusion-controlled solute-loss into additive powder particles (APPs), as determined by particles size, during the equilibration stage of wide-gap brazing, on microstructure and fatigue behavior of a brazed aerospace superalloy was studied. The results, which experimentally confirm previously reported numerical model simulation results, show that, in order to avoid degradation of fatigue life of wide-gap brazement, adequate solute-loss into the APPs, which is necessary to prevent their complete melting, but has not been generally considered, is imperative.

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The authors would like to thank NSERC of Canada for financial support.

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Author notes

  1. L. O. Osoba (Lecturer)

    Present address: Department of Metallurgical and Materials Engineering, University of Lagos, Lagos, Lagos State, Nigeria

Authors and Affiliations

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

    L. O. Osoba (Lecturer) & O. A. Ojo (Professor)

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  1. L. O. Osoba
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  2. O. A. Ojo
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Correspondence to O. A. Ojo.

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Manuscript submitted November 25, 2012.

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Osoba, L.O., Ojo, O.A. Influence of Solid-State Diffusion during Equilibration on Microstructure and Fatigue Life of Superalloy Wide-Gap Brazements. Metall Mater Trans A 44, 4020–4024 (2013). https://doi.org/10.1007/s11661-013-1849-x

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