Wide gap brazing (WGB) is a cost effective and reliable means to repair gas turbine hot section components with defect sizes exceeding 0.3 mm. However, it has been shown that WGB joints of nickel-based superalloys suffer from reduced ductility and thermal fatigue life due to the presence of brittle intermetallics and porosities in the brazed joint. In order to disperse the brittle intermetallic compounds, potentially increase the ductility of the repaired region, and reduce the risk of the thermomechanical fatigue failure, elemental tungsten (W) was added to the braze additive filler alloy IN738 by mechanical alloying. The alloyed IN738 was then brazed with the addition of 30 wt %, 50 wt %, and 80 wt % of braze alloy (BNi-9). After brazing at for 20 min, microstructural analysis of WGB joints showed a decreasing trend of discrete boride size and the amount of eutectic and script-shaped borides with the increases of W. The increase in the braze alloy to additive filler alloy ratio diminished the effect of W addition due the dissolution of W particulates.
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June 2010
Research Papers
Effect of Tungsten Addition on the Nucleation of Borides in Wide Gap Brazed Joint
Daniel McGuire,
Daniel McGuire
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, Ontario K1S 5B6, Canada
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Xiao Huang,
Xiao Huang
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, Ontario K1S 5B6, Canada
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Doug Nagy,
Doug Nagy
Liburdi Engineering
, 400 Highway 6 North, Dundas, Ontario L9H 7K4, Canada
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Weijie Chen
Weijie Chen
NRC Institute for Aerospace Research
, 1200 Montreal Road, Building M-17, Room 104, Ottawa, Ontario K1A 0R6, Canada
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Daniel McGuire
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, Ontario K1S 5B6, Canada
Xiao Huang
Department of Mechanical and Aerospace Engineering,
Carleton University
, Ottawa, Ontario K1S 5B6, Canada
Doug Nagy
Liburdi Engineering
, 400 Highway 6 North, Dundas, Ontario L9H 7K4, Canada
Weijie Chen
NRC Institute for Aerospace Research
, 1200 Montreal Road, Building M-17, Room 104, Ottawa, Ontario K1A 0R6, CanadaJ. Eng. Gas Turbines Power. Jun 2010, 132(6): 062101 (6 pages)
Published Online: March 24, 2010
Article history
Received:
April 16, 2009
Revised:
April 17, 2009
Online:
March 24, 2010
Published:
March 24, 2010
Citation
McGuire, D., Huang, X., Nagy, D., and Chen, W. (March 24, 2010). "Effect of Tungsten Addition on the Nucleation of Borides in Wide Gap Brazed Joint." ASME. J. Eng. Gas Turbines Power. June 2010; 132(6): 062101. https://doi.org/10.1115/1.4000136
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