Microstructure and high temperature tensile properties of wide gap brazed cobalt based superalloy X-40

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TypeArticle
Journal titleEnergy Materials: Materials Science and Engineering for Energy Systems
ISSN1748-9237
Volume5
Issue2
Pages431439; # of pages: 9
SubjectCobalt-based superalloy; High temperature tensile properties; IN738; Microstructure characterisation; Nanoindentation techniques; Ultimate tensile strength; Wide-gap brazing; X-40; Boron; Cerium alloys; Cobalt; Gas turbines; High temperature properties; Microstructure; Superalloys; Tensile strength; Tensile testing; Brazing
AbstractWide gap brazing (WGB) of X-40 cobalt based superalloy was conducted in this study using BNi-9 braze alloy with X-40 and IN738 additive alloys. A groove was machined into X-40 bars with a nominal width of 6?35 mm before filler application. Following brazing at 1200°C for 15 min, the microstructure of the as brazed joints was examined using SEM, EDS and nanoindentation technique. Both WGB joints with X-40 and IN783 additive alloys contained primary matrix phase in addition to a number of boron containing phases which assumed either eutectic or discrete forms. Nanoindention testing revealed that these boron containing phases exhibited hardness values several times higher than the base alloy and matrix phase contributing to the embrittlement of the braze joint. Porosity was also observed in both types of WGB braze joints, the degree of which was greatest in the braze joints with IN738 additive alloy. Tensile testing at 950uC showed that the yield strength of both WGB joints was higher than that of the baseline specimens while the ultimate tensile strength of the WGB joints was lower than that of the baseline X-40. The ductility of the WGB joints was significantly inferior to that of the baseline X-40, particularly for WGB with IN 738 additive alloy. © 2010 Institute of Materials, Minerals and Mining.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269515
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Record identifier79e6df72-ba8d-4b90-8e28-687914181979
Record created2013-12-12
Record modified2016-05-09
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