ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Vacuum repair brazing of Inconel 939 using various ratios of DF3 and Rene 80 powdermixtures has been performed in this study. The porosity of the brazed zone is decreased as theamount of DF3 is increased in the powder mixture. At least four phases are observed in the brazedzone including chromium borides, sparse carbides, Ni-rich matrix and eutectic phases. Primarychromium borides are widely observed at the early stage of repair brazing. Dissolution of the Nifrom the Rene 80 powder into the molten braze results in isothermal solidification of the residualmelt. The chemical composition of the residual melt subsequently moves towards the lowesteutectic temperature, and the eutectic is finally formed in brazing. The oxidation resistance test isperformed at 1000oC. Extensive spalling of the oxide film begins at 144 h, and catastrophic failureof the oxide film is observed at 1272 h. The oxidation resistance of the brazed zone is significantlydegraded due to the formation of chromium borides in the brazed zone
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.51.71.pdf
